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EMWT HACW Manual - Nordic Geothermal Heat Pump

1. Page 20 Fic ee c ens Page 21 Sarp 1070 3 P Page 22 GENERAL EEN PAGE 23 TROUBLESHOOTING GUIDE EE PAGE 24 ala ls Page 33 Hetrigeradon Circuit RE Tel E Page 34 MODEL SPECIFIC INFORMA TION aos sacananessenanainanciaaiiszeLendina dayal rdi ntu exui sues PAGE 36 Hefrigerant Charge across Page 36 SHIPPING Ru te dun e pet w SR R Page 36 Standard Capacity le E Page 36 Capacity Ratings aa Page 38 SI d RE Page 40 Electrical Diagrams 23021460 ini rep Haa er ARa ER IA I I aD RS E ESPERE EIE Page 41 Case 81 11 M is Page 43 WARRANTY INFORMATION vvs PAGE 44 01 MAR 2012 Page 3 000662MAN 03 Tables Diagrams and Drawings TABLES Table 1 Control Signal Description Rees deeg CN RSR Page 5 ETIKETT TEE Page 6 Table 3 Control Board Fault Codes ENEE KEEN Page 6 Tablet nd LNR Page 6 Table 5 Compressor Truth Table Heating Priority ENEE ENEE Page 11 Table 6 Compressor Truth Table Cooling Priority EEN Page 11
2. Compressor ZPS51K4E PFV o T BTU Hr EER em SS Watts COPci C se 7 o s o Watts Watts lgpm am F BTU Hr L min les im Watts lgpm L min 12 0 54 2 12 0 0 6 54 2 12 0 oC C 45 7 7 9 ro 44 Wam es as Jus em 459 77 58215 2740 122 295 200 s alias mor san Cc E E 69 D rs 42 es s r 7463 73 50 150 2087 138 3159 159 7 rs ass Compressor ZPS51K4E PFV Page 38 01 MAR 2012 12 0 4 2 12 0 54 2 12 0 54 2 12 0 Z 54 2 12 0 54 2 1 1 34 1 1 A Oo co al 000662MAN 03 CAPACITY RATINGS continued Heating Mode Nominal6ton Power Consumption EMWT 75 HACW P 1T R410a 60 Hz Watts Amps Watts W W ele F BTU Hr E E E Watts 49 235 14 426 53 142 15 570 57 240 16 771 61 800 18 107 66 915 19 606 72 252 21 170 77 762 22 784 CH Om 3 OT Om 0 T 104 0 40 0 104 0 40 0 104 0 40 0 104 0 40 0 104 0 40 0 104 0 40 0 104 0 40 0 4 935 9 185 2 78 NO NO N N N D co Co co N OT 5 202 2 99 D go Oo O1 5 021 5 270 3 18 D NO O e E 00 N I do 00 o 5 281 3 43 A 5 104 9 325 3 68 NO NO co E 9 332 3 97 Mo co o 4 22 45
3. Single Unit Connection to DHW Pre Heat Tank Brass FPT Size Drawing Number REV SHEET 01 MAR 2012 Theory of Operation TABLE 5 Compressor Truth Table SYSTEM DESCRIPTION Heating Priority The EMWT HACW heat pump is a stand alone reversing Heating Cooling system which contains both a hot and cold buffer tank The unit will maintain each of the tanks at the desired setpoint by auto Stage 1 Stage 2_ matically switching modes between heating and cooling COMPRESSOR OPERATION The compressor operates based on the combination of the calls for heating and cooling loads The operation is as shown in TABLE 5 for when the unit is set to heating priority and TA BLE 6 for when the unit is set for cooling priority Impossible combinations have been removed from the table for simplicity There are three different operating scenarios for this unit heating load only cooling load only and simultaneous heating and cooling loads Each of these scenarios is explained in the following sections HEATING LOAD ONLY OPERATION TABLE 6 Compressor Truth Table Cooling Priority As described previously this unit has three heating stages Stage 1 Stage 1 compressor part load Stage 2 Stage 2 27 full load and Stage 3 heating tank electric ele Stage 1 Stage 2 Stage 1 Stage 2 Stage 1 Stage 2 Mode In the heating load only scenario the Hot Tank will see a temperature drop due to the heating load Whe
4. 1 Air filters fuses refrigerant fluids oil Products relocated after initial installation Any portion or component of any system that is not supplied by MG regardless of the cause of the failure of such portion or component Products on which the unit identification tags or labels have been removed or defaced Products on which payment to MG or to the owner s seller or installing contractor is in default Products subjected to improper or inadequate installation maintenance repair wiring or voltage conditions Products subjected to accident misuse negligence abuse fire flood lightning unauthorized alteration misapplication contaminated or corrosive liquid or air supply operation at abnormal air or liquid temperatures or flow rates or opening of the refrigerant circuit by unqualified personnel Mold fungus or bacteria damage Corrosion or abrasion of the product 0 Products supplied by others 1 Products which have been operated in a manner contrary to MG s printed instructions 2 Products which have insufficient performance as a result of improper system design or improper application installation or use of MG s products 3 Electricity or fuel or any increases or unrealized savings in same for any reason whatsoever cept for the limited labour allowance coverage set forth above MG is not responsible for The costs of fluids refrigerant or system components supplied by others or associated labo
5. 140 547 7 3 59 755 7 2 633 126 41 17 508 5 174 9 395 68 0 er o TI E 50 14 0 59 9 8 1 65 905 5 180 10 0 63 3 15 5 4 5 19 310 BTU Hr NO co co Compressor ZPS60K4E PFV VVatts 5 401 4 55 104 0 40 0 oF or lgpm 83 934 24 592 o Om c il Solo SIS O 02 Ww O 69 D Bi 1 1 D Bla 1 1 01 MAR 2012 co Co 14 0 63 3 14 0 63 3 14 0 3 3 14 0 63 3 Q Olu o 46 0 7 6 67 520 3 011 Watts 13 7 3 237 COPc 20 9 46 2 7 4 65 983 3 210 14 6 3 436 19 2 N co IN 19 9 3 638 464 72 64 398 3 412 17 7 46 4 7 2 60 120 3 60 164 3 810 15 8 67 80 40 izes 462 46 6 7 0 58 508 3 770 17 3 4 020 14 6 46 8 6 8 56 843 3 989 18 2 4 238 13 4 77 47 0 66 55 124 4 217 19 2 4 466 12 3 Compressor ZPS60K4E PFV Page 39 C C 45 70 21 1 75 23 9 80 26 7 85 29 4 OT OT OT O h 32 2 95 I NO cs z 37 8 82 105 L min m F ele ele Watts 30 140 756 86 72 271 000662MAN 03 SS gt mur Amps ga 65 5 196 1231 25 43 50 279 866 100 34 75 27 3 153 81 6 99 9 gt 32 9 176 87 2 106 9
6. HSC 1T Schematic Diagram ENNEN ENEE Page 41 000454SCH EMWT HSC 1T Schematic Diagram 26 2 eee Page 42 000662MAN 03 Page 4 01 MAR 2012 Installation Information UNIT DESCRIPTION The EMWT Series unit is a high efficiency R410a refriger ant two stage geothermal heat pump with a hot and cold buffer tank zone circulators expansion tank valves and gauges and controls t is a compact stand alone modular system that greatly reduces installation time and space The unit has several key features that are described in the specifications document for the particular heat pump Please request a copy if desired or visit www nordicghp com UNPACKING THE UNIT When the heat pump reaches its destination it should be unpacked to determine if any damage has occurred during shipment Any visible damage should be noted on the carrier s freight bill and a suitable claim filed at once The heat pump is well constructed and every effort has been made to ensure that it will arrive intact however it is in the customer s best interest to examine the unit thoroughly when it arrives OPTIMUM PLACEMENT The placement of a hydronic unit has negligible effects on the operation of the system For ground water systems the unit can be placed near the well water system ground loop system units can be place near where the header pipes enter the struc ture to keep the ground loop piping heat pump a
7. PRIORITY SELECTION Stage 1 Stage 1 compressor part load and Stage 2 Stage 2 compressor full load In the cooling load only scenario the Cold Tank will see a temperature rise the due to the cooling load When the Cold To set the cooling mode as priority connect a jumper wire be Tank reaches the Stage 1activation temperature the compres tween the two PR terminals in the electrical box refer to the sor will start part load mode the Hot Indoor and Cold Indoor SCH and ELB diagrams circulators will be turned on to circulate fluid between the heat l exchangers To set the heating mode as priority disconnect the jumper be tween the two PR terminals in the electrical box If the cooling load is still too large the Cold Tank will once again continue to rise in temperature When the cooling Stage 2 activation temperature is reached the compressor solenoid will be energized to operate the compressor in full load mode Units are shipped with a jumper wire between the PR terminals 01 MAR 2012 Page 11 000662MAN 03 Sizing and Hydronic Information HEAT PUMP SIZING TABLE 7 depicts a rough guideline as to the size of home each heat pump size can handle for ground loop installations TABLE 7 Heat Pump Size vs Heated Area for a Ground Loop System Sps ons Lt same I mn 66 310 290 TABLE 8 depicts a rough guideline as to the size of home each heat pump size can handle for ground water ins
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9. Move the fill hose to the Cold Zone Boiler Drain 23 Close the top isolation valve of the Cold Zone Circulator 24 Open the Cold Zone and Cold Indoor Boiler Drains AS ARI 000662MAN 03 25 Open the fill hose valve 26 Purge until no air can be heard leaving the system Close the Cold Zone Ball Valve CAUTION the domestic hot water pump is water 28 Open the top isolation valve of the Cold Zone Circulator N M HES S Vamage wit 757 me pump uim 29 Purge until no air can be heard leaving the system 30 Close the Cold Indoor Boiler Drain 31 Move the drain hose to the Hot Indoor Boiler Drain 32 Open the top isolation valve of the Cold Indoor Circulator 33 Open the Hot Indoor Boiler Drain 34 Purge until no air can be heard leaving the system 35 Close the Hot Indoor Boiler Drain 36 Close the Cold Zone Boiler Drain when the system reaches tank d EN is Th the desired pressure level a oes not require electric elements This setup takes fu 37 Close the fill hose valve and disconnect the hoses advantage of the desuperheater as it is the sole heat provider to 38 Open the Cold Zone and Cold Indoor Ball Valves l the pre heat tank The desuperheater remains active during the 39 Open the Hot Zone and Hot Indoor Ball Valves l compressor runtime until the pre heat tank has been completely 40 Do a final check of all ball valves and isolation valves to 7 d 51 v 7 57 This setup is more e
10. sized ground loop Dirty or fouled coaxial Disconnect the water lines and Have a qualified service technician heat exchanger check the inside of the pipes for backflush the coaxial exchanger typically for ground water scale deposits unlikely for ground loop Indoor Loop entering liq Measure temperature Should be Restrict Indoor liquid flow tempo uid temperature too cold above 60 F 15 C rarily until buffer tank comes up to temperature TXV stuck almost closed Adjusting the TXV does not affect Adjust the TXV all the way in and out a or partially blocked by for the superheat or the suction pres few times to loosen it Replace TXV if eign object sure TXV may be frosting up this does not work Low refrigerant charge Entering liquid temperature flow Locate the leak and repair it and entering air temperature are opray nine a sniffer and dye are good but suction is low Check common methods of locating a static refrigeration pressure of the leak unit for a very low value Faulty compressor not Pressures change only slightly from Replace compressor pumping static values when compressor is started 01 MAR 2012 Page 27 000662MAN 03 OPERATION TROUBLESHOOTING HEATING MODE mm SK TS TC High Suction Leaking reversing valve 1 Reversing valve is the same tempera Replace reversing valve Pressure ture on both ends of body common may appear to suction line is warm compressor is not be pu
11. sizes 55 65 75 This is based on a typical parallel system with one circuit per ton Maritime Geothermal recommends calculating the total pressure drop of the ground loop including headers indoor piping and heat pump exchanger drop based on the antifreeze type and concentration at the desired minimum loop temperature A pump module that can deliver the flow required for the unit at the calculated total pressure drop should be selected Refer to the Model Specific Information section for unit flow requirements Loop pressure drops can be calculated using software such as those mentioned in the Horizontal Ground loops section or can be calculated in a spreadsheet using the pipe manufacturer s pressure drop tables for pipe diameter and fittings The circulator pump module must be connected to the heat pump Outdoor Loop ports with a lineset suitable for the flow required with minimum pressure drop 1 rubber or plastic lines should be used The installation of P T plugs pressure temperature pronounced Pete s plugs is recommended on both the entering and leaving lines at the heat pump see Diagram C DIAGRAM C Typical P T Pete s Plug amp Thermometer Stems P T Plugs Pete s Plug Gage Adaptor THE PRESSURE G 3 K e N va BA Pa a ui x NY w NV a T NO Rk GT AN N DIAMETER PROBE OF 304 STAINLESS STEEL WITH UNION NUT Protective Cover Included AS PROTECTION 4 PROCE
12. ua aaa aaa ada Raya REX NEUE E EN EVE ge Page 8 THEORY OF ORERA NONE AMP AP T EE PAGE 11 System D ESE T D OR vaare 00 m m Page 11 Compressor O peoral o l dca Gn MISES da a Page 11 Heating Load Only ele ECH e LE Page 11 Cooling Load Only Operation 2 eee Page 11 Simultaneous Heating and Cooling Load Operation NEEN ENEE Page 11 PRIORITY SCICCUONS ge 0 w X Page 11 SIZING AND HYDRONIC INFORMATION 5525222 ENEE sese nnne PAGE 12 Heat PUMP SENG a Page 12 Hydronic Applications EN CC E Page 12 GROUND WATER SYSTEM INFORMATION REENEN ENEE EEN gege PAGE 14 APP a Page 14 PIUMDING the Heat PUMPE tre inde Page 14 uA sub Page 14 Water DiScharge NN Page 14 GROUND LOOP SYSTEM INFORMAT ON ad aad a a mamaya ab adama PIRE medalla PAGE 17 Circulator Pump ier Page 17 Flushing amp Purging the Ground e Sieg eere Nee ide SEN ee deeg Page 17 Adding Antitreeze ijo eu G Page 18 mia Prossurizalicm tSc Page 18 PIPE INSUIQUION C bal Page 18 STARTUP PROCEDURE eege Di Page 20 Pre Start pei f
13. 61 4 74 7 4 4 10 64 3 78 3 4 4 000662MAN 03 Page 40 01 MAR 2012 ELECTRICAL DIAGRAMS 230 1 60 EMWT Series Schematic Diagram 208 230 1 60 Two Stage Scroll Reversing 230VAC 115VAC 415VAC White Neutral Black Red 115VAC Heating Zone Heating Zone Circulator Circulator Contactor fed y For 208VAC move the red wire connected to the 240 terminal of the transformer to the 208 erminal 115VAC Cooling Zone Cooling Zone Circulator Circulator Contactor 240VAC 208VAC 1 Gu m mm mm um 100VA Control x Compressor R Outdoor Loop Pumps 7 dip rov 230v C S D 9 We Ge i 5 2 Start C 2 Potential art Cap E Relay 4 3 Indoor Circulator YY Select Relay al Lee V 115VAC Cold L 2 Indoor Circulator 115VAC Hot L ndoor Circulator 1 115VAC DHVV Compressor Circulator Pump Contactor N ON E Ww L OFF Hot Water Electric Heat Contactor NOTE n case of short or overload rectify the problem and press black button on transformer to reset breaker Transformer P Required Connections White Black Stripe HEATING AQUASTAT Common C COOLING AQUASTAT 5 r i YYYY White Black Stripe
14. Dale DEG 08 1 gr o TTT Name Geo Flo Circulator Pump Module EN NN O A ais DEC 08 Installation Brass FPT Initial Release C GEDDES C GEDDES 09 DEC 08 m Size Drawing Number REV SHEET Vi ate ow PA 000906PDG 01 1 of 1 000662MAN 03 A m lt m Q O l 5 r lv lt D lt UJ lt 01 MAR 2012 Page 19 Startup Procedure The following steps describe how to perform the startup procedure of the geothermal heat pump The EMWT HACW Series Two Stage R410a Startup Record located in this manual is used in conjunction with this startup proce dure to provide a detailed record of the installation A completed copy should be left on site a copy kept on file by the installer and a copy should be sent to Maritime Geothermal Ltd Check the boxes or fill in the data as each step is completed For data boxes circle the appropriate units Fill in the top section of all three copies or one copy if photocopies can be made after the startup has been completed PRE START INSPECTION Heating and Cooling Zone Loops 1 Verify that all shutoff valves inside the unit are fully open 2 Verify that the entire system has been flooded and all the air has been purged as much as possible Further purging may be required after the system has been operating for a while 3 Verify that the loop contains the proper mix of antifreeze if used for the intended application If applicable re
15. EXPRESS RESIDENTIAL WARRANTY LABOUR This Limited Express Residential Labour Warranty shall cover the labour incurred by MG authorized service personnel in connection with the installation of a new or repaired warranty part that is covered by this Limited Express Residential Warranty only to the extent specifically set forth in the current labour allowance schedule A provided by MG s Warranty Department and only as follows 1 MG Units for two 2 years from the Warranty Inception Date 2 Thermostats auxiliary electric heaters and geothermal pump modules built or sold by MG when installed with MG Units for two 2 years from the Warranty Inception Date 3 Sealed refrigerant circuit components of MG Units which components only include the compressor refrigerant to air water heat exchangers reversing valve body and refrigerant metering device for five 5 years from the Warranty Inception Date Labour costs are not covered by this Limited Express Residential Warranty to the extent they exceed the amount allowed under said allowance schedule they are not specifically provided for in said allowance schedule they are not the result of work performed by MG authorized service personnel they are incurred in connection with a part not covered by this Limited Express Residential Warranty or they are incurred more than the time periods set forth in this paragraph after the Warranty Inception Date This warranty does not cover and does not apply to
16. Lake minimum 80ft Stream Submersible Pump Nordic Pitless Adaptor Water Table minimum 80ft Submersible Pump Pressure Pitless Adaptor Water Table Tile Field minimum 8Oft Submersible Ground Water Disposal Methods Size Drawing Number REV SHEET AAA CED ris Geddes Li L Petitcodiac NB op pf meg MARITIME GEOTHERMAL mn 2222 Chris_Geddes Drawina N DP Io T T yaxrn lt gt swing Name Chris Geddes Approved By MFG Date C GEDDES GEDDES os FEB 08 EV ECO IMPL BY APVD BY DATE A 000662MAN 03 Page 16 01 MAR 2012 Ground Loop System Information Once the ground loop has been pressure tested and the header pipes have been connected to the circulator pump module the heat pump can be connected to the circulator pump module CIRCULATOR PUMP MODULE Maritime Geothermal Ltd has compact pump modules with built in three way valves to facilitate filling and purging the ground loop Refer to drawing 000906CDG at the end of this section Alternatively Grundfoss Model UPS 26 99 or Taco Model 0011 pumps or other brands with similar pumping capability may be used The single pump module will typically handle systems up to 3 tons model sizes 25 35 and 45 the two pump module will typically handle 4 to 6 ton systems model
17. Nese MARITIME GEOTHERMAL ITO Installation and Service Manual EMWT HACW Series Two Stage R410a Model Sizes 65 75 Two Tank Hydronic Geothermal Heat Pumps 63 Maritime Geothermal Ltd Email info nordicghp com P O Box 2555 Web www nordicghp com Petitcodiac N B 42 6H4 Document Number 000662MAN 03 Ph 506 756 8135 REVISION DATE 01 MAR 2012 N SAFETY PRECAUTIONS N WARNING Ensure all access panels are in place and properly secured before applying power to the unit Failure to do so may cause risk of electrical shock WARNING Before performing service or maintenance on the heat pump system ensure all power sources are DISCONNECTED Electrical shock can cause serious personal injury or death WARNING Heat pump systems contain refrigerant under high pressure and as such can be hazardous to work on Only qualified service personnel should install repair or service the heat pump CAUTION Safety glasses and work gloves should be worn at all times whenever a heat pump is serviced A fire extinguisher and proper ventilation should be present whenever brazing is performed CAUTION Venting refrigerant to atmosphere is illegal A proper refrigerant recovery system must be employed whenever repairs require removal of refrigerant from the heat pump MODEL NOMENCLATURE EMWT 65 HACW P 1 T CC 12K xx Series n Revision EMWT Energy Module Liquid to water 01 02 etc Hydronic with two tank
18. TERMINOLOGY The following terms are used to describe the various loops of the EMWT heat pump system e Outdoor Loop Connections for the ground loop exchanger or ground water system e Hot Zone Loop Connections for building heating zone loop The Hot Zone Circulator provides flow for this loop e Cold Zone Loop Connections for building cooling zone loop The Cold Zone Circulator provides flow for this loop e Hot Indoor Loop Hot water loop between the condenser and the Hot buffer tank inside the unit e Cold Indoor Loop Cold water loop between the evaporator and the Cold buffer tank inside the unit DHW Loop Connections for the Domestic Hot Water INTERNAL HYDRONIC COMPONENTS The EMWT Series unit has virtually everything required for a hydronic installation built into it including the following 50 USGAL 189L Hot buffer tank with electric backup 50 USGAL 189L Cold buffer tank Pre charged expansion tank 75PSIG pressure relief valve Hot Zone Circulator B amp G NRF 36 with isolation valves e Cold Zone Circulator B amp G NRF 36 with isolation valves e Pressure gauges e Shutoff valves and boiler drains for purging e Individual heating and cooling tank aquastats Refer to Diagram B for the locations of the components The pump curve for the Heating and Cooling zone circulators is shown in Diagram A DIAGRAM A B amp G NRF 36 Pump Curve RITT 5 REDS NRF 36 Speed 1 N
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20. YES position to change the anti short cycle timer to 5 seconds Be sure to set it back to NO when servicing is complete POWER SUPPLY TROUBLESHOOTING Verification Fault Possible Cause No povver to the heat pump Disconnect svvitch open if installed Verify disconnect svvitch is in the ON position Recommended Action Determine vvhy the disconnect switch was opened if all is OK close the switch Fuse blown Breaker Tripped Transformer breaker tripped No display on either aquastat Faulty transformer Faulty aquastat 000662MAN 03 At heat pump disconnect box voltmeter shows 230VAC on the line side but not on the load side Breaker on transformer is sticking Out Transformer breaker is not tripped 230VAC is present across L1 and L3 of the compressor contactor but 24VAC is not present across R and C of the terminal strip 24VAC is present across 24V and COM of the aquastat but there is no display Page 24 Reset breaker or replace fuse with proper size and type Time delay type D Push breaker back in If it trips again locate cause of short circuit and correct Replace transformer Replace aquastat 01 MAR 2012 AQUASTAT TROUBLESHOOTING Fault Possible Cause Verification Recommended Action No signal to Y of Incorrect aquastat setup Aquastat does not indicate S1 on Correct the setup safety board the display Faulty aquastat No 24
21. as described in the paragraph above for the percolation method When discharging the waste water below the surface of a pond the discharge pipe should be placed below the frost line to prevent the pipe from freezing As opposed to the percola tion method water will remain in the end of the pipe It is rec ommended that the surface of the pond be lower than the instal lation location of the heat pump where practical This reduces the back pressure generated by the weight of the water in the pond Typical Ground Water Installation for Size 25 75 Heat Pumps for Units With Brass FPT Fittings TACO 24VAC EBV Electronic Ball Valve NOTE Refer to the heat pump labels HEAT PUMP for connection locations CONNECTIONS Connect the harness plug to the connector inside the heat ELECTRICAL CONNECTOR OUTDOOR OUT SUPPLY OUT 1 Brass FPT 1 Line NOTE Remove valve the valve in the open P T Plugs OUTDOOR IN pa SUPPLY IN 1 Brass FPT 1 Line ks It is recommended that either unions or boiler drains be installed to provide connection points for flushing the coaxial exchanger should it need to be cleaned due to scaling head and manually place position before soldering NOTE Dole valves can be quite noisy Placing a the optional ball valve approximately two feet from the Dole valve can reduce the noise level Alternately the Dole valve can be placed outside the home Dole Valve Recomme
22. m Heater Element Limit NOTE Connect the brovvn vvire vvith the insulated terminal to the bottom left terminal of the compressor contactor T1 marked A once lines are filled and purged The gt Element DHW ON OFF SWITCH can be used to enable disable the pump Heating Storage Tank WELL Slow WELL LOOP Close Valve Solenoid Valve No Valve 1 1 _ c 1 1 10 2 2 SIS Y 2 25 2 2 3 3 ene ES 3 3 4 4 E 4 4 6 6 6 co 24V R High 24V COM 24V COM Control R410a 565psig E 9 2 sw pres do Board Indoor Stat HZ l R410a 75psig STATUS Indoor Stat CZ STAGE 2 27115 NC C NO p 5 77 Compressor Cooling PP HP CHR See m 3 Flow Contactor M 100002 Coil Priority Wiring Low Pres ES Select Relay E connect for PR cooling priority A dry contact closure between R and HZ activates the indoor circulator pump A dry contact closure between R and CZ activates the indoor cooling circulator pump Low Pres gt Reversing edi Electric Heat EE ies valve Coil SCH NIA d Timer on make 4 psi Contactor Coll Indoor Circulator single stage Electric Heat R410a 55psig Yellow black stripe wire no
23. the heating or cooling aquastat If it is not present on either proceed to POWER SUPPLY TROUBLE SHOOTING otherwise proceed to STEP 2 STEP 2 Remove the door and electrical box cover and check to see if there is a fault code on the safety board If there is record the fault code Turn the power off wait 10 seconds and turn the power back on Set the appropriate aquastat for a call for heating or cooling depending on the season STEP 3 otherwise proceed to STEP 4 STEP 4 FAULT CODE TROUBLESHOOTING section otherwise proceed to STEP 5 STEP 5 If there is no signal present across Y and C of the safety board proceed to the AQUASTAT TROUBLE SHOOTING section If a fault code appears once S1 displays on the aquastat and the compressor does not attempt to start proceed to the If no fault codes appear and the compressor does not attempt to start attempts to start but cannot starts hard or starts but does not sound normal proceed to the COMPRESSOR TROUBLESHOOTING section otherwise proceed to STEP 6 STEP 6 elsewhere Proceed to the OPERATION TROUBLESHOOTING section If the compressor starts and sounds normal this means the compressor is OK and the problem lies STEP 7 If the heat pump appears to be operating properly but no hot or cold water is making it to the zones proceed to the ZONE TROUBLESHOOTING section NOTE To speed up the troubleshooting process the Test Jumper on the safety board can be placed to the
24. us PSI kPA Watts w WM Stage 2 4 545 58 800 17 2 4s ass gapet 5860 22000 158 Stage2 4 860 66 300 19 4 000662MAN 03 Page 36 01 MAR 2012 LL Tons r L S We EXENEXCICIEREJI US 2 iz 2m E ENENENCHOERNES 38 3 16 3 Stage 2 3 895 57 900 17 0 15 NaCl by Weight Ground Loop Fluid Ratings Ground Water Cooling 60Hz Lis A A BTU Hr kW WW 1 800 42 900 126 7 00 ET 2 2 785 57200 16 8 6 02 Stage 1 2 350 51 300 15 0 6 40 01 MAR 2012 Page 37 000662MAN 03 CAPACITY RATINGS Heating Mode EMWT 65 HACW P 1T Nominal 5 ton R410a 60 Hz Watts Watts W W ele BTU Hr 2 BTU Hr 2 Los 67 Ser 20 26 0487 2 E a E 4 230 4 304 4 538 sch 4 545 4 607 OT 4 396 4 412 4 477 4 486 4 709 4 716 4 778 2 90 3 12 3 31 3 57 3 70 3 99 4 23 C 104 0 40 0 104 0 40 0 104 0 40 0 104 0 40 0 104 0 40 0 104 0 40 0 104 0 nd o E o O Watts 43 553 12 761 46 993 13 769 50 625 14 833 54 639 16 009 59 483 17 428 64 152 18 796 69 007 O OM 2 on I OIO CO A oo C Co C o 40 0 104 0 40 0 20 219 74 405 21 800 72 542 124 42 15535 50 120 59 6 84 58 398 4 613 10 0 54 2 153 47 17 110 19 6 4 784 4 56
25. 220 1 50 Page 40 Table 21 Heat Pump Electrical Information 380 3 50 EEN ENEE ENEE EE Page 40 DIAGRAMS Diagram A B amp G NRF 36 Pump Curve 8 8 88882888888888888888838 98983983 9 Page 7 Diagram B Circulator and Major Component Locations ERKENNEN ENEE En Page 8 Diagram C Typical P T Pete s Plug amp Thermometer Stem euer Page 18 Diagram D Typical Purge Cal ursine Page 18 Case Detalls Page 43 DRAWINGS 000665CDG Typical Heating and Cooling Zone Wiring Diagram EMWT H CW Series Page 9 000970PDG Single Unit Connection to DHW Pre Heat Tank Page 10 000530PDG Typical Zone Types for Hydronic Applications ENEE Page 13 000907CDG Typical Ground Water Installation for Size 25 75 Heat Pumps Brass FPT Page 15 000619INF Ground Water Disposal Methods NEEN Page 16 000906CDG Geo Flo Circulator Pump Module Installation Brass FPT Page 19 000421RCD EMWT HAC Series Refrigeration Circuit Diagram Heating Mode Page 34 000422RCD EMWT HAC Series Refrigeration Circuit Diagram Cooling Mode Page 35 000453SCH EMWT
26. AC to pump Check gauges for pressure drop TXV closed too far Verify superheat It should be be Adjust TXV to obtain 8 12 F tween 8 12 F 3 6 C Superheat 1 3 6 C superheat will be high if TXV is closed too far TXV stuck almost closed Adjusting the TXV does not affect Adjust the TXV all the way in and out a or partially blocked by for the superheat or the suction pres few times to loosen it Replace TXV if eign object sure this does not work Filter drier plugged Feel each end of the filter drier it Replace filter drier should be the same temperature If there is a temperature difference then it is plugged Also causes low suction pressure Unit is overcharged High sub cooling low delta T Remove 1 2lb of refrigerant at a Only possible if unit has across air coil time and verify that the discharge been opened in the field pressure reduces and incorrectly charged Low Suction Low or no Outdoor liquid Delta T across the Outdoor Loop Determine the cause of the flow Pressure flow ports should be between 5 7 F restriction and correct it 3 4 C or compare pressure drop Verify pumps are working and to the tables for the unit sized correctly for ground loop sys tems Verify well pump and water valve is working for ground water systems Entering liquid tempera Measure the entering liquid temper Increase the size of the ground ture too cold ature Most likely caused by under loop
27. ENCE OR AS STRICT LIABILITY OBTAINING WARRANTY PERFORMANCE Normally the dealer or service organization who installed the products will provide warranty performance for the owner Should the installer be unavailable contact any MG recognized distributor dealer or service organization If assistance is required in obtaining warranty performance write or call Maritime Geothermal Ltd Customer Service PO Box 2555 Petitcodiac New Brunswick E4Z 6H4 506 756 8135 or e mail to info nordicghp com NOTE Some states or Canadian provinces do not allow limitations on how long an implied warranty lasts or the limitation or exclusions of consequential or incidental damages so the foregoing exclusions and limitations may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state and from Canadian province to Canadian province Please refer to the MG Installation Installation and Service Manual for operating and maintenance instructions ef An extended warranty option is also available Please contact Maritime Geothermal Ltd via the contact information in the previous paragraph for more information
28. EP 2 can be re used Disconnect the purge cart and set the pump module valves back to the original positions STEP 10 Operate the system and check for improved performance STEP STEP ES Depending on the plumbing there should be either unions or boiler drains for to access the heat exchanger PURGING THE SYSTEM There are several ball valves and boiler drain valves in the unit that can be used to help purge the system The Electon ic Ball Valves EBV located near the bottom of the cold tank on the left side of the unit can be opened and closed manu ally as well to direct flow while purging Adjust valves as necessary to purge each individual circuit in this unit It can take some time to completely flush the system particularly if there are several zones IMPORTANT NOTE In order to properly purge the Cold Indoor Circulator refer to Diagram B close the ball valve in the bottom port of the cold tank and connect a supply line to the boiler drain next to it This forces fluid through this loop it will not get purged otherwise Ensure all ball valves are open once purging has been completed 01 MAR 2012 Page 23 000662MAN 03 Troubleshooting Guide The following steps are for troubleshooting the geothermal heat pump If the problem is with the domestic hot water or the auxilliary backup electric heat proceed to the relevant section at the end of the troubleshooting guide STEP 1 Verify that the display is present on
29. Express Residential Warranty LIMITATION OF REMEDIES In the event of a breach of the Limited Express Residential Warranty MG will only be obligated at MG s option to repair the failed part or unit or to furnish a new or rebuilt part or unit in exchange for the part or unit which has failed If after written notice to MG s factory in Petitcodiac New Brunswick of each defect mal function or other failure and a reasonable number of attempts by MG to correct the defect malfunction or other failure and the remedy fails of its essential purpose MG shall refund the purchase price paid to MG in exchange for the return of the sold good s Said refund shall be the maximum liability of MG THIS REMEDY IS THE SOLE AND EXCLUSIVE REMEDY OF THE BUYER OR PURCHASER AGAINST MG FOR BREACH OF CONTRACT FOR THE BREACH OF ANY WARRANTY OR FOR MG S NEGLIGENCE OR IN STRICT LIABILITY LIMITATION OF LIABILITY MG shall have no liability for any damages if MG s performance is delayed for any reason or is prevented to any extent by any event such as but not limited to any war civil unrest government restrictions or restraints strikes or work stoppages fire flood accident shortages of transportation fuel material or labour acts of God or any other reason beyond the sole control of MG MG EXPRESSLY DISCLAIMS AND EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGE IN CONTRACT FOR BREACH OF ANY EXPRESS OR IMPLIED WARRANTY OR IN TORT WHETHER FOR MG s NEGLIG
30. Information GENERAL REQUIREMENTS 1 The temperature of the well water should be a minimum of 39 F 4 C and should normally be 45 F 7 C 2 The well system must be able to supply the required water flow as listed under the Total Flow column in TABLE 9 TABLE 9 Required Flow and Air Tank Sizing Heat Minimum Air Pump Bladder Flow Tank IGPM IGal USGPM USGPM USGPM USgal 12 14 4 15 18 0 30 36 14 16 8 17 20 4 34 41 These are minimum water requirements based on an entering water temperature of 46 F Based on two minute well pump run time Use next size larger tank if there is not a match for the value indicated PLUMBING THE HEAT PUMP Plumbing lines both supply and discharge must be of adequate size to handle the water flow necessary for the heat pump A 1 copper or plastic line should be run to the Outdoor IN Supply IN pipe of the heat pump Similarly a 1 line should be run from the Outdoor OUT Supply Out pipe to the method of disposal P T plugs should be installed at each port See Diagram A in the Ground Loop section for a description of P T plugs The water valve should be installed in the discharge line Refer to drawing 000907CDG at the end of this section for the recommended setup Placing the water valve in the dis charge line ensures that the heat exchanger inside the heat pump remains full of water when the unit is not running Unions or some other form of
31. L I DVADEZ 5 JOEN JeyeM JOH ONSALIOG 09 L SLL r e m SIOJEINDID pue auoz 09 L GLL S o sjuaula 3 Joie 10H 09 L 0 Z Jojoejuo eclelele 1088 09 1 06 Joyoedeo uny JOJE NIND Joor Olooole saBeyoA j euJjoju ul sAS 1085 2 Suez 9ucZ o z AS epouJ o o Aupoud jes Bujooo Buneen joeuuoOSIq SpoW Buijooo jejsenby jejsenby ayewW uo JEU JESH p 0140 eunje1eduje 04409 eumesedLus juopa O9UE BuIs4ana4 JOJOS SBEIS OM 09 1 062 802 Kjuoud 195 o Hd Md 198UUO JOJe NoJID euoz Buljooo ay uo uin o ZO pue y 198UUO E N Aes Ne S Joje noJio euoz Bunesy x Zx Z EU as SISIG IG ANA NANA Ne MA CN CS ay uo UN o ZH pue y Josuuos NIC x WX x O e Fi el 141 mun pajas Auoug dd eJnsseJd pJeog 0 1002 120 9 Ajuoug Md M01 JEIS I JOJe noJIy euoz Sulloo2 ZO PISA Joje noJi euoz DuneeH ZH 10H Ab d UOWWOD VAT ueJjBeiq xog e213j99 3 seues LAWMW3 BULIIM mo 01 MAR 2012 Page 42 000662MAN 03 CASE DETAILS ELECTRICAL SERVICE 41 1 2 DHIN IN 12 E EN DHAN OUT 12 FFT iN GROUND LOOP OUT 1 FPT GROUND LOOP IN 1 FPT HOT LOO
32. P OUT 1 FPT HOT LOOP IN 1 FPT DOOR ACCESS TAF CIRC PUMPS AIR BLEED PRESSURE RELIEF TAPS VALVES DRAIN 1 2 FPT Back View 28 1 2 Right Side View 01 MAR 2012 Page 43 000662MAN 03 p 19 LIMITED EXPRESS WARRANTY CE It is expressly understood that unless a statement is specifically identified as a warranty statements made by Maritime Geothermal Ltd a corporation registered in New Brunswick Canada MG or its representatives relating to MG s products whether oral written or contained in any sales literature catalogue or agreement are not express warranties and do not form a part of the basis of the bargain but are merely MG s opinion or commendation of MG s products EXCEPT AS SPECIFICALLY SET FORTH HEREIN THERE IS NO EXPRESS WARRANTY AS TO ANY OF MG S PRODUCTS MG MAKES NO WARRANTY AGAINST LATENT DEFECTS MG MAKES NO WARRANTY OF MERCHANTABILITY OF THE GOODS OR OF THE FITNESS OF THE GOODS FOR ANY PARTICULAR PURPOSE LIMITED EXPRESS RESIDENTIAL WARRANTY PARTS MG warrants its Residential Class products purchased and retained in the United States of America and Canada to be free from defects in material and workmanship under normal use and maintenance as follows 1 Air conditioning heating and or heat pump units built or sold by MG MG Units for five 5 years from the Warranty Inception Date as defined below 2 Thermostat
33. Pond river or stream ENSURE SELECTED WATER DISCHARGE METHOD CONFORMS TO LOCAL CODES 01 MAR 2012 A return well should be a minimum of 80 ft from the supply well for residential applications The water returned to the well will not necessarily be pumped into the same aquifer depend ing on underground conditions The return must be able to sup ply at least the same quantity of water as the amount you wish to recharge into it If the static level level when not being pumped of a well is high 10 to 20 ft from the surface it may be necessary to place a well cap on the well to keep the return water from flowing out the top of the well This cap is commonly required since a certain amount of pressure is needed to force the return water back down the well if the static level is high Water discharged by percolation will generally soak into the ground within a distance of 50 to 100 ft If suitable care is taken to ensure that the drain pipe runs downhill and the end of the pipe is protected by a bale of hay or spruce bows etc the end of the pipe will not freeze as the pipe will empty out when the heat pump shuts off and the water valve closes When snow comes it will usually cover the entire process much like a small spring It is recommended that the pipe be below the frost line when possible for maximum freeze protec tion When discharging into a river or stream or above the surface of a pond the same guidelines should be followed
34. RF 36 Speed 2 NRF 36 Speed 3 01 MAR 2012 ELECTRIC HEAT The Hot Tank contains electric elements for the purpose of auxiliary backup heat The control for the electric heat comes from the Heating Aquastat Stage 2 signal The signal passes through a 0 2H timer before reaching the electric heat contactor coil The timer is set to 1H one hour at the factory The unit is shipped with the electric heat breaker in the off position IT IS VERY IMPORTANT THAT THE INDOOR LOOP IS FLOODED AND PRESSURIZED BEFORE TURNING ON THE ELECTRIC HEAT BREAKER An electric element that is not under water will burn out in a matter of seconds There is a safety pressure switch mounted to the side of the Hot Tank the electric heat contactor will not engage unless the pressure in the indoor loop is above 10PSIG Should the heat pump require service the compressor breaker should be turned off This prevents the refrigeration section from operating but allows the electric heat to continue operating until the unit can be re paired HEATING ZONE CONNECTIONS The Heating Zone ports are 1 FPT brass fittings refer to CASE DETAILS The heating zone header pipes can be con nected to these ports The Heating Zone Circulator is activated by connecting R and HZ together via dry contacts COOLING ZONE CONNECTIONS The Cooling Zone ports are 1 FPT brass fittings refer to CASE DETAILS The cooling zone header pipes can be con nected to these ports The C
35. SS THREAD 5 VALVE RETAINER 01 MAR 2012 Page The P T plug will allow the installer or homeowner to check water flow through the loop by measuring the pressure difference through the heat exchanger and comparing it to that listed in the Model Specific Information section or the specifications document Optional fittings with P T ports are available for the circulator pump modules sold by Maritime Geothermal Ltd FLUSHING amp PURGING THE GROUND LOOP Once the groundloop has been installed and all connections are completed between the heat pump circulator pump module and ground loop the entire ground loop system should be pressure tested with air to 100 PSIG to make sure there are no leaks on any of the inside fittings Soap all joints and observe that the pressure remains constant for 1 hour When satisfied that all connections are leak free release the air pressure and connect a purge cart See Diagram D to the flushing access ports at the pump module refer to drawing 000906CDG A temporary flushing system can alternately be constructed using a 45 gal barrel and a pump with sufficient volume and head capability to circulate fluid at a velocity of at least 2 ft min through all parts of the loop DIAGRAM Typical Purge Cart Adjust the circulator pump module valves to connect the purge cart to the ground loop Begin pumping water through the ground loop ensuring that the intake of the pump stays submerged at all t
36. Suction frosting up Pressure in this section TXV frosting up Random Low Pressure trip does not occur while there 01 MAR 2012 Unit is overcharged Only possible if unit has been opened in the field and incorrectly charged TXV adjusted too far open TXV stuck open High sub cooling low delta T across water coll Verify superheat It should be be tween 8 12 F 3 6 C Superheat will be low if TXV is open too far Adjusting the TXV does not affect the superheat or the suction pres sure Low super heat and dis charge pressure Remove 1 2lb of refrigerant at a time and verify that the discharge pressure reduces Adjust TXV to obtain 8 12 F 3 6 superheat Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Leaking reversing valve Aquastat set too low Reversing valve is the same tem perature on both ends of body common suction line is warm compressor is running hot Verify aquastat setting Replace reversing valve Raise aquastat setting to recom mended value of 45 F 7 C Low or no flow in heat ex changer to buffer tank circuit Faulty internal circulator select relay TXV stuck almost closed or partially blocked by for eign object Low or no refrigerant charge Faulty compressor not pumping TXV stuck almost closed or partially blocked by for eign object Faulty compressor contactor Intermi
37. Sune H ee qnoi Y copos o 20 AON s3qds O saca39 o sziooo o uogejeDujeM seueS OVH LMIAS suen bumeig fg ped z 833 or iwnvaHs G Lnvsk G 16 000 Teo emed TII 1 SALE 11 DIE 041 Lo d o LNO YOOALNO NI H3lVM lt JosseJdujo ssejo Jojeinunooy Je 1465 epou SIU ui 2 SI RM t Josuspuog ALON Jojeode 3 INO H3lVM Jayeausodnseq m Ino NI HOOALNO Ree I ino gt somes UD HOd 1 doo7 uedo 99IAJ9S CH moin i lABA 9JnsS9Jd MOT Ch KeM p doo7 peso 2 L mono Ag JINSS Jd MOT uieJq 19109 SAMBA uu POD loopul pul 10H PIOD 9q0J nnn g Add SAEN SALA leg OlSdg2 9949 joopu 10H i jer A OSI dund Jeyng JOODU 10H Jalen T anen n dE cl o iae nen leg 3u07 yE SOWJOY pejensu QUOZ leg 9uoZ 002 10H QUO7Z 10H buneau n l U01 e 19B1119Y NI 9uoz PICO A oun einssejg 9UOZ DO T uowms A osi dund s re yue Ajayes d 9UOZ JOH assola INO euoz pjoo s L s 2UH LMN3 buc NI uoz 10H 1 BUOZ JOH 01 MAR 2012 Page 34 000662MAN 03 gt Q 3 S Q 3 A Oo S E Y Q Q 2 3 h NY T E Qr Qr NX PN EA 133HS JequnwN azis opo N Duiooo ujejDeiq Nosso uoneJeDiuos S H S VH LAAVIZ BUEN Buiwe
38. Table 7 Heat Pump Size vs Heated Area for Ground Loop Systems Page 12 Table 8 Heat Pump Size vs Heated Area for Ground Water Systems Page 12 Table 9 Required Flow and Air Bladder Tank Sizing ENEE ENEE EE REENEN EEN Page 14 Table 10 Antifreeze Percentages by Volume unrunvunvnnvnnvnnvnnvnnvnnnnnnnernvnnvnnvnnvnrnnvnnvnnvnnvnnvnnnevnvnnnnr Page 18 Table 11 Volume of Fluid per 100ft Of Pipe rnnrnnrnnnnrnnnnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnn Page 18 Table 12 Hefrigerant H4 LU KE Page 36 Table 13 Shipping information aa E xz odu adad das Page 36 Table 14 Standard Capacity Ratings Ground Loop Heating 60Hz Page 36 Table 15 Standard Capacity Ratings Ground Water Heating 60Hz Page 36 Table 16 Standard Capacity Ratings Ground Loop Cooling 60HZ Page 37 Table 17 Standard Capacity Ratings Ground Water Cooling 60Hz Page 37 Table 18 Heat Pump Electrical Information 230 1 60 Page 40 Table 19 Heat Pump Electrical Information 208 3 60 Page 40 Table 20 Heat Pump Electrical Information
39. VAC between Stage 1 NO Replace aquastat and COM of the aquastat when S1 is indicated on the aquastat display Setting s not Faulty aquastat E2 error message Can cause the Replace aquastat retained unit to trip a safety control if the set ting is too high or low FAULT CODE TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Fault Code 1 Faulty High Pressure Con Verify if there is 24VAC across HP1 Replace high pressure control if High Pressure trol open on the safety board and C of the voltage is present on HP1 but not Control Must be a signal present terminal strip as well as HP2 and C on HP2 on Y1 for this test HP pressures must be at static levels Faulty Safety Board 24VAC is present across HP1 and Replace Safety Board C1 and HP2 and C but no voltage is present across CC on the safety board and C Fault Code 2 Faulty Low pressure con Verify if there is 24VAC across LP1 Replace high pressure control if Low Pressure trol open on the safety board and C of the voltage is present on LP1 but not Control Must be a signal present terminal strip as well as LP2 and C on LP1 on Y1 for this test HP pressures must be at static levels Faulty Safety Board 24VAC is present across LP1 and C Replace Safety Board and LP2 and C but no voltage is present across CC on the safety board and C Unit out of refrigerant Check static refrigeration p
40. aintenance GENERAL MAINTENANCE SCHEDULE Interval Procedure Contactor 1 year Inspect for pitted or burned points Replace if necessary Heat exchangers As required Clean as per HEAT EXHCANGER FLUSING PROCEDURE below Circulators 1 year Inspect for corrosion or leaks Expansion Tank 1 year Inspect for corrosion or leaks verify bladder pressure Generally not required for closed loop systems Both exchangers have the same antifreeze mix in them COAXIAL HEAT EXCHANGER FLUSHING PROCEDURE GROUND LOOP STEP 1 Isolate the heat exchanger by placing the pump module valves in the exchanger flushing position Connect a compressed air and a drain pipe to the pump module purge ports and blow the anti freeze solu tion into a clean 5 gallon bucket Connect a purge cart to the pump module purge ports Place 2 gallons of RYDLYME in the purge cart Circulate the fluid through the heat exchanger for at least 2 hours 3 recommended Disconnect the purge cart and dispose of the solution RYDLYME is non toxic and biodegradable and as such can be poured down a drain Clean the purge cart thoroughly Connect fresh water and a drain to the pump module purge ports and flush the exchanger for several minutes STEP 7 Blow the heat exchanger out with compressed air as per STEP 2 and dump the water down a drain Connect the purge cart to the pump module purge ports Re fill and purge the heat exchanger with as per standard procedures the anti freeze from ST
41. ble by hand caution pipes get hot If the DHW OUT line does not become hotter than the DHW IN line the circulator is air locked Bleed the air from the system and check the temperature differential again to ensure there is flow from the circulator Turn the electric heat timer knob counter clockwise as far as it will go Turn on the electric heat breaker inside the unit The yellow light on the side of the unit should turn on Measure the L1 current draw with an clamp meter and record the value It should be between 45 and 52A Set the electric heat timer to the desired setpoint 0 2hours 1 hour is the minimum recommended value Cooling Mode 1 2 3 Turn the compressor breaker inside the unit off Set a zone thermostat to cooling mode to switch the unit to cooling mode Turn the compressor breaker on again Monitoring the refrigeration gauges while the unit runs Record the following after 10 minutes of runtime Suction pressure Discharge pressure Outdoor Loop In Supply In temperature Outdoor Loop Out Supply Out temperature Outdoor Delta T RON 4 Allow the unit to run through a cycle Record the aquastat setpoint and the suction pressure when the unit shuts off Final Inspection Turn the compressor breaker off Set the aquastat s to the final settings and record the values Turn the power off to the unit and remove all test equipment Turn the compressor breaker back on Install the elec
42. cient and will required expensive auxil iary heat to maintain a comfortable temperature in the home and the cost savings of having a geothermal heat pump are greatly reduced Once the total heat loss has been calculated the unit can be sized using the performance tables from the specifications document in conjunction with the minimum expected entering liquid temperature of the ground loop well water temperature for ground water system The heat pump output must be able to match the total heat loss at the selected entering water tempera ture in order to provide a comfortable environment with minimal auxiliary heat HYDRONIC SYSTEMS GENERAL Hydronic systems typically provide heat through two different types of media e radiant in floor heating e forced air heating via fan coil units One of the benefits of hydronic systems is the flexibility in setting up the heating system Whereas a typical forced air sys tem has one central thermostat controlling the entire heating system the home may be sectioned into several areas called zones with a hydronic system Each zone has its own thermo stat allowing simple separate temperature control of the individ ual areas in the home There are other uses for hydronic systems the two most com mon being on demand domestic hot water and pool spa heat ing Drawing 000530PDG shows the most common types of zones A typical system consists of the heat pump the buffer tank and the zones For
43. compressor Check for infinite resistance between each terminal and ground If any terminal to ground is not infinite replace the compressor Compressor attempts to start but trips its internal overload after a few seconds Run capacitor already ver ified Attempt to rock compressor free If normal operation cannot be established replace compressor Check with capacitance meter Check for black residue around blowout hole on top of capacitor Replace if faulty Remove black residue in electri cal box if any Replace if faulty Attempt to rock compressor free If normal operation cannot be established replace compres Sor Replace with new one and verify compressor starts properly Compressor attempts to start but trips its internal overload after a few seconds Run capacitor has been verified already Verify if 24VAC is present across Replace module if signal is pre NO and C of Stage 2 of the aquastat sent Check wiring if signal is not that it powered up present Page 26 01 MAR 2012 OPERATION TROUBLESHOOTING HEATING MODE EC Possible Cause Veriicauon Recommended Action eee High Discharge Aquastat set too high Verify aquastat setting Lower aquastat setting to recom Pressure mended value of 115 46 C Low or no flow in heat ex Check that isolation flanges and Ensure flow path is unrestricted changer to buffer tank any ball valves are open Verify Replace pump if faulty circuit 115V
44. cord the type of antifreeze and the mixture value on the startup sheet circle Vol or Weight 4 Record the static loop pressure on the startup sheet The value must be above 12PSIG The electric heat will not function if the pressure is below this value Outdoor Loop Ground Loop 1 Verify that all shutoff valves are fully open and there are no restrictions in the piping from the heat pump to the ground loop and that full flow is available to the heat pump 2 Verify that the entire system has been flooded and all the air has been purged as much as possible Further purging may be required after the system has been operating for a while 3 Verify that the loop contains the proper mix of antifreeze for the intended application Record the type of antifreeze and the mixture value on the startup sheet circle Vol or Weight 4 Record the static loop pressure on the startup sheet Outdoor Loop Ground Water 1 Verify there are no leaks in the connections to the unit Verify the water valve is installed and properly oriented in the return line 2 Verify that there is flow control in the return line Domestic Hot Water if equipped 1 Verify that all shutoff valves are fully open and there are no restrictions in the piping from the heat pump to the domestic hot water tank 2 Verify that the entire system has been flooded and all the air has been purged as much as possible Further purging may be required after the system has been
45. covery unit as per the instructions in its manual Ensure the recovery tank valve is closed before disconnecting the hose to it Connect a nitrogen tank to the charging manifold and add nitrogen to the heat pump until a positive pres sure of 5 10PSIG is reached This prevents air from being sucked into the unit by the vacuum when the hoses are disconnected The heat pump is now ready for repairs Always ensure nitrogen is flowing through the system during any soldering procedures to prevent soot buildup inside the pipes Maritime Geothermal Ltd recommends re placing the liquid line filter drier anytime the refrigeration system has been exposed to the atmosphere VACUUM AND CHARGING PROCEDURE STEP 1 After completion of repairs and nitrogen pressure testing the refrigeration circuit is ready for vacuuming STEP 2 Release the refrigerant circuit pressure and connect the vacuum pump to the charging manifold Start the vacuum pump and open the charging manifold valves Vacuum until the vacuum gauge remains at less than 500 microns for at least 1 minute with the vacuum pump valve closed STEP 3 Close the charging manifold valves then shut off and disconnect the vacuum pump Place a refrigerant tank with the proper refrigerant on a scale and connect it to the charging manifold Purge the hose to the tank label on the unit or the Refrigerant Charge Chart in the MODEL SPECIFIC INFORMATION section for the STEP 4 Weigh in the appropriate amount of re
46. ctivated by connecting R and HZ together via dry contacts The Cooling Zone circulator is activated by connecting R and CZ together via dry contacts TABLE 1 Control Signal Description 24VAC Hot Priority Select Priority Select Dry contacts are used for all heat pump connections to ensure that the heat pump control signals remain isolated from the rest of the system The PR terminals are used to configure the prior ity of the unit The unit is shipped with a jumper wire connected between the PR terminals to select cooling mode as the priority mode remove the jumper to select heating as the priority mode Signal Drawing 000665CDG depicts a heating cooling wiring diagram These drawings represent a basic system in which heating is the default mode and cooling has priority t is rec ommended that the system be designed by a qualified system designer to ensure proper functionality TABLE 2 shows typical settings for the aquastats With these settings Stage 1 will activate when the tank temperature reaches the activation point If the load is too great the tank temperature will continue to drop when heating rise when cool ing until Stage 2 is activated As the tank temperature stops dropping and begins to increase when heating decrease when cooling Stage 2 will turn off before Stage 1 rather than at the same time as Stage 1 There are three main advantages to this Less aquastat probe lag leading to reduced ove
47. d 140 if required by local code Tank Problem be set at 120 F 140 if required by local code Breaker tripped or fuse Check both line and load sides of Replace blown fuse or reset blown in electrical supply fuses If switch is open determine breaker to hot water tank why Reset button tripped on Check voltage at elements with Push reset button hot water tank multimeter Insufficient hot Circulator pump not Visually inspect the pump to see if Replace if faulty water operating shaft is turning Use an amprobe to Heat Pump measure current draw Problem Blockage or restriction in Check water flow and power to Remove obstruction in water the water line or hot water pump Check water lines for lines Acid treat the domestic hot heat exchanger obstruction water coil Faulty DHW cutout failed Check contact operation Should Replace DHW cutout if faulty open close at 120 F and open at 140 F Heat pump not running Note the amount of time the heat Temporarily turn up the tank enough hours to make pump runs in any given hour thermostats until colder weather sufficient hot water creates longer run cycles Water is too hot Faulty DHW cutout failed Check contact operation Should Replace DHW cutout if faulty closed close at 120 F and open at 140 F Thermostat on hot water Visually inspect the setting Readjust the setting to 120 F tank set too high Should 140 F if required by local cod
48. der Header Domestic Pre Heat Domestic Pre Heat Domestic Pre Heat Zone Tank Zone Valve Pool Spa Pool Spa Zone Zone Valve Titanium Heat Pool Spa A Exchanger Temperature Probe b POOL SPA Pool NOTES 1 Floor zones are heating only Cooling a floor zone will cause condensation in the floor Floor zone valves should be wired through a relay that is controlled by the cooling signal O that breaks the signal when in cooling mode to ensure that they cannot accidentally be energized There may be multiple floor zones There may be multiple fan coil units heating and or cooling A zone valve is not required if the unit has a internal valve 4 Domestic Pre Heat Tank is for on demand apllications The tank must have a heat eaxchanger in it or an external one must be used to separate the zone loop from the potable water supply Ensure the floor circulator is adequately sized to accomodate the type and number of zones connected to the system The pool aquastat will operate the Pool Spa Zone Valve Se m WS WE EE WPS 66 5 5 Chris Geddes 06 SEP 07 Petitcodiac NB Chris Geddes 06 SEP 07 SMS Pr ses or Typical Zone Types for Hydronic Applications Chris Geddes 06 SEP 07 j j i i SE mp o Typical Zone Types for Hydronic Applications Size Drawing Number REV SHEET A 000530PDG 01 10f 1 06 SEP 07 DATE 01 MAR 2012 Page 13 000662MAN 03 Ground Water System
49. disconnect should be used so that the coaxial heat exchanger may be accessed should it required cleaning The heat pump has an electrical connector for the water valve just inside the case After the water valve is installed run the valve harness into the case through the hole provided Re move the jumper plug from the Valve Connector and connect the harness in its place Ideally there will be water flow available in excess of the requirement of the heat pump In such a situation the proper pump can be selected to maintain a pressure of 30 to 40 psig on the lines when the heat pump is operating However in some cases a well can supply a heat pump only if the minimum requirement for water is used Water flow to the heat pump can be controlled very accurately by the installation of a reverse action refrigeration pressure valve in the discharge line of the unit 000662MAN 03 Page 14 Another more common method of regulating the flow is by the use of a DOLE Valve This valve will automatically control the amount of water flowing through it by varying the diameter of a flexible rubber orifice through which the water passes This minimizes the water usage of the unit and also prevents a re versing unit from running excessively low discharge pressure when in cooling mode Dole valves can be noisy it is recom mended that they be installed outside if possible Optionally a water flow meter can be installed in the dis charge line so
50. e be set at 120 140 F if required by local code Dole flow control Valve The Dole flow control is a simple self cleaning device designed to deliver a constant volume of water from any outlet whether the pressure is 15 psig or as high as 125 psi The controlling mechanism consists of a flexible Digital orifice that varies its area inversely with In line Flowmeter pressure so that a constant flow is maintained E E ZS Multimeter Voltmeter 000662MAN 03 Page 32 01 MAR 2012 REPAIR PROCEDUHES PUMP DOWN PROCEDURE Connect the refrigerant recovery unit to the heat pump service ports via a refrigeration charging manifold and to a recovery tank as per the instructions in the recovery unit manual If there was a compressor burn out the refrigerant cannot be reused and must be disposed of according to local codes All water coil heat exchangers must either have full flow or be completely drained of fluid before recovery begins Failure to do so can freeze and rupture the heat exchanger voiding its warranty Note that this does not apply to double wall domestic hot water exchangers desuperheater coils Ensure all hose connections are properly purged of air Start the refrigerant recovery as per the instructions in the recovery unit manual Allow the recovery unit suction pressure to reach a vacuum Once achieved close the charging manifold valves Shut down purge and disconnect the re
51. eat breaker Insufficient Indoor Loop pressure Reset if tripped If not tripped verify that there is 230VAC across L1 and L3 of the electric heat contactor Verify Indoor loop pressure Must have at least 12PSIG to engage the safety pressure switch Besommended Action Determine why breaker was tripped Replace breaker if faulty Increase Indoor Loop pressure Faulty Timer Note timer is set to 2 hours at factory Check timer setting Adjust to mini mum value to test timer Verify 24VAC across each of the terminals to C on the terminals strip Replace timer if faulty Faulty electric heat contactor Voltage on line side with contactor held closed but no voltage on one or both terminals on the load side Points pitted or burned Or 24VAC across coil but contactor will not engage Replace contactor Faulty aquastat Faulty aquastat S2 is not showing on the display when it should be according to the settings and tank temperature S2 is showing on the display but 24VAC is not present across Stage 2 NO and COM in the aquastat Replace aquastat Replace aquastat Faulty elements One faulty element With power off to the unit measure the resistance across the T1 and T3 terminals of the electric heat contac tor Under 6 ohms both elemenis good Infinity both elements bad With power off to the unit measure the resistance across the T1 and T3 terminals of t
52. ed and adjusted if necessary Add additional water antifreeze mix with the purge cart to bring the pressure back to the original setting if required PIPE INSULATION All ground loop piping inside the structure between the structure entry point and the heat pump should be insulated with 3 8 thick closed cell pipe insulation to prevent condensation and dripping onto floors or walls 01 MAR 2012 Geo Flo Circulator Pump Module Installation Units with Brass FPT Fittings Air Bladder 2911 1 to 1 1 4 PE Socket els 77 Pressure Gauge 1 Fill amp Purge access ports 0 60PSIG Boiler 2914 Camlocks can be used e Drain for quick connections Fittings can be removed and reused on other jobs when purging is complete ge mc i H Connect wiring to appropriate voltage terminals marked OUTDOOR CIRCULATORS in Boiler Drain the heat pump electrical box P 7 7 NOTE m 1 or 2 Basement Refer to the heat pump labels pump Vvall module for connection locations HEAT PUMP P T PI CONNECTIONS Pluss e OUTDOOR IN e LS 1 1 4 PE 3408 SUPPLY IN 1 Flexible Rubber Hoses copper or other suitable E OUTDOOR OUT Qu piping 100 psig min SUPPLY OUT Available Fittings 3144 1 Sweat optional P T Fill gap between 2913 1 Barbed insulation and wall 1 FPT Suitable 1 MPT 3072 1 MPT with expanding foam Brass Fittings Adapter NOTES Ci
53. eral times to get all the antifreeze into the loop Pump the loop for 5 to 10 minutes longer to ensure the remaining fluid has been well mixed 000662MAN 03 Page 18 TABLE 11 Volume of fluid per 100 ft of pipe Volume 100ft Type of Pipe 7 owe Tur silm 3 4 IPS SDR11 2 3 8 10 6 VIPSSDRI 3 7 5 17 0 EN 1 1 4 IPS SDR11 EE 1 1 2 IPS SDR11 INITIAL PRESSURIZATION At this point open all valves in the flow circuit and slowly close off the supply and return flush cart valves in a manner that leaves about 20 30 psig on the system If an air bladder expansion tank is used it should be charged to the above pressure before actual water pressure is put on the system Systems without an expansion tank will experience greater fluctuations in pressure between the heating and cooling seasons causing pressure gauges to have different values as the loop temperature changes This fluctuation is normal since expansion and contraction of the loop fluid must be handled by the elasticity of the plastic loop e Pressurize the loop to a static pressure of 45 psig when installing a system in the fall going into the heating season e Pressurize the loop to a static pressure of 25 psig when installing a system in the spring or summer going into the cooling season After operating the heat pump for a period of time any residual air in the system should be bled off and the static pressure should be verifi
54. frigerant through the low pressure suction service port Refer to the proper charge amount STEP 5 If the unit will not accept the entire charge the remainder can be added through the low pressure service port after the unit has been restarted REPLACMENT PROCEDURE FOR A COMPRESSOR BURN OUT STEP 1 Pump down the unit as per the Pump Down Procedure above Discard the refrigerant according to local codes STEP 2 Replace the compressor Replace the liquid line filter drier STEP 3 Vacuum the unit until it remains under 500 microns for several minutes with the vacuum pump valve closed STEP 4 Charge the unit with NEW REFRIGERANT and operate it for continuously for 2 hours Pump down the unit and replace the filter drier Vacuum the unit until it remains under 500 microns for several minutes with the vacuum pump valve closed STEP 5 Charge the unit refrigerant can be re used and operate it for 2 3 days Perform an acid test If it fails pump down the unit and replace the filter drier STEP 6 Charge the unit refrigerant can be re used and operate it for 2 weeks Perform and acid test If it fails pump down the unit and replace the filter drier STEP 7 Charge the unit a final time Unit should now be clean and repeated future burn outs can be avoided 01 MAR 2012 Page 33 000662MAN 03 3 tr S E 3 3 2 KN x i S Fr tr Jo L 60 4241 27 000 Y s l sapo SINO Adv Tan 093 was Spo
55. functioning calling for cooling Faulty reversing valve so Verify solenoid by removing it from Replace solenoid if faulty lenoid coil the shaft while the unit is running There should be a loud whoosh sound when it is removed Faulty reversing valve A click can be heard when the coil Replace reversing valve is energized but the unit continues to heat instead of cool High Discharge Low or no Outdoor liquid Delta T across the Outdoor Loop Determine the cause of the flow pressure flow ports should be between 8 12 restriction and correct it 4 7 C or compare pressure drop Verify pumps are working for to the tables for the unit ground loop systems Verify well pump and water valve is working for ground water systems Entering liquid tempera Most likely caused by undersized Verify the ground loop sizing In ture too warm ground loop crease the size of the ground loop If undersized Dirty or fouled coaxial Disconnect the water lines and Have a qualified service technician heat exchanger check the inside of the pipes for backflush the coaxial exchanger typically for ground water scale deposits unlikely for ground loop 000662MAN 03 Page 28 01 MAR 2012 OPERATION TROUBLESHOOTING COOLING MODE Fault Possible Cause Verification Recommended Action High Discharge pressure High Suction Pressure may appear to not be pumping Low Suction Pressure Compressor See Low
56. he electric heat contac tor 6 to 12ohms one element bad Page 30 Replace the faulty elemenis Measure each element individual ly to determine the faulty one and replace it 01 MAR 2012 ZONE TROUBLE SHOOTING Faut Possible Cause Verification Recommended Action No hot water to individual heating zone Faulty zone thermostat wiring or zone valve head s Faulty zone valve s No hot water to Shut off valve closed any heating zones Faulty hot zone circulator contacior Faulty hot zone circulator No cold water to individual cooling zone Faulty zone thermostat wiring or zone valve head s Faulty zone valve s No cold water to Shut off valve closed any cooling zones Faulty cold zone circulator contacior Faulty cold zone circula tor 01 MAR 2012 No 24VAC signal present across T and C of the heat pump terminal Strip Other zones work 24VAC is present across T and C of the heat pump terminal strip but no hot water reach es the zone Verify that all valves in the zone loops are open including isolation valves at the zone circulator inside the unit 24VAC is present across T and C of the heat pump terminal strip but the contactor does not energize Or contactor is energized but 115VAC is not present across the wire on the load terminal and ground 115VAC is present across the wire on the load terminal of the hot zone circulator and ground but circula
57. hile operat ing in heating mode 1 Low or no Outdoor loop flow 2 Low Outdoor loop entering liquid temperature 3 Dirty or fouled Outdoor loop heat exchanger B High Pressure Control The high pressure safety control monitors the compressor discharge pressure and will shut the compressor down if the condensing pressure becomes too high There are 3 main reasons why this control would activate in response to the operating conditions of the unit while operat ing in heating mode 000662MAN 03 Page 6 1 Low or no Hot Indoor loop flow 2 High Hot Indoor loop entering liquid temperature 3 Dirty or fouled Hot Indoor loop heat exchanger The unit contains a control board that monitors the safe ty controls and operates the compressor accordingly The low pressure control is connected to LP1 and LP2 The high pres sure control is connected to HP1 and HP2 The control board also has provisions for a flow switch The flow switch is unused from the factory and a jumper wire is placed across the FLOW SWITCH terminals If a flow switch is desired the jumper can be removed and the two leads from the flow switch can be connected to the FLOW SWITCH terminals on the safety board The flow switch is ignored for 30 seconds on compressor startup to allow time for flow to be established The high and low pressure controls are monitored at all times the compressor will not be able to start if either of them has a fault The control boa
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59. imes by continuously adding water Water flowing back from the return line should be directed below the water level in the barrel or flush tank to prevent air being mixed with the outgoing water 17 000662MAN 03 Once the lines have been filled and no more air bubbles are appearing in the line adjust the circulator pump module valves to circulate water through the heat pump using the same technique as described above When all air is removed reverse the flow of water through the lines by interchanging the flush cart lines and purge again You will be able to visibly tell when all air is removed ADDING ANTIFREEZE SOLUTION In most mid and northern areas of the US and in all of Canada it is necessary to condition the loop fluid by the addition of some type of antifreeze solution so that it will not freeze during operation in the winter months This antifreeze is required because the loop fluid will normally reach a low entering temperature of 28 F to 32 F 2 C to 0 C and refrigerant temperatures inside the heat pump s heat exchanger may be as low as 20 F 11 C cooler See TABLE 10 for details of freeze protection provided by different concentrations TABLE 10 Antifreeze Percentages by Volume T ST 20 1 0 Methanol 25 21 16 10 Propylene Glycol 38 30 22 15 NOTE Add enough antifreeze to allow for a temperature 20 F lower than the expected lowest loop fluid temperature entering the hea
60. lowing voltages on the power block and record them on the startup sheet L1 L2 L2 L3 L1 L3 Verify that the green light on the side of the cabinet is on Heating Mode 1 2 3 Turn the compressor breaker on The compressor will start allow 30 60 seconds for the water valve to open for ground water systems as well as the circulator pumps Check the refrigeration gauges The suction and discharge pressures will depend on the loop temperatures but they should be about 90 110PSIG and 250 320PSIG respectively for a typical start up Monitoring the refrigeration gauges while the unit runs Record the following after 10 minutes of runtime Suction pressure Discharge pressure Outdoor Loop In Supply In temperature Outdoor Loop Out Supply Out temperature Outdoor Delta T should be between 5 8 F 3 4 C Outdoor flow if available Compressor L1 C current black wire place meter between electrical box and compressor NOOR WD Let the unit run through a cycle Record the setpoint and the discharge pressure when the unit shuts off For units with a desuperheater turn the power off to the unit Connect the brown wire with the blue insulated terminal to the compressor contactor as shown in the electrical box diagram Turn the power to the unit on Open a zone or zones and let the tank cool down until Stage 2 is activated Close the zone s again Verify the DHW IN and DHW OUT temperatures if applica
61. mp labels for connection locations 1 2 COPPER LINES Insulate with 5 8 pipe insulation OPTIONAL must install both DHW IN 1 2 FPT HEAT PUMP CONNECTIONS 1 2 Union E ES Hu 1 2 Ball Check Boiler Valve Valve Drain 1 2 COPPER LINES Insulate with 5 8 pipe insulation Ball Valve Y OPTIONAL must install both 125pisg 1 2 PRV Ball Valve DHW OUT 1 2 1 2 MET NOTE Refer to the heat pump labels for connection locations Domestic COLD IN from well DHW IN 1 2 FPT 000662MAN 03 0157 7 Chris Geddes 10 MAR 09 prp 1 Chris Geddes 10 MAR 09 py Approved By TENS Dai Approved MFG Date Initial Release C GEDDES C GEDDES 10 MAR 09 REV Eco BY APVD DATE eech Ball Valve 125psig Pressure Relief Valve Insulated Domestic Hot Water Pre Heat Tank t Pressure Relief alve Insulated Domestic Hot Water Pre Heat Tank Drawing Name Page 10 MARU GEOTHERMAL m Ball Valve Domestic HOT OUT to house or mixing valve 125psig Pressure Relief Valve 120 140 F 50 60 C Electric or Gas Insulated Domestic Hot Water Tank p Domestic HOT OUT to house or mixing valve 125psig Pressure Relief Valve 120 140 F 50 60 C Electric or Gas Insulated Domestic Hot Water Tank 170 Plantation Rd Petitcodiac NB EAZ 6H4
62. mping running hot TXV adjusted too far Verify superheat lt should be be Adjust T XV to obtain 8 12 F open tween 8 12 F 3 6 C Superheat will 3 6 C superheat be low if TXV is open too far TXV stuck open Adjusting the TXV does not affect the Adjust the TXV all the way in and out superheat or the suction pressure a few times to loosen it Replace Low super heat and discharge pres XV if this does not work sure Compressor See Low Suction frosting up Pressure in this section TXV frosting up TXV stuck almost closed Adjusting the TXV does not affect the Adjust the TXV all the way in and out or partially blocked by for superheat or the suction pressure a few times to loosen it Replace eign object TXV if this does not work Random high Faulty compressor contac Points pitted or burned Contactor Replace contactor pressure trip sometimes sticks causing the com does not occur pressor to run without the fan tripping while on site the high pressure control Intermittent Hot Indoor Verify wiring is good Correct the wiring or replace the Loop circulator heat ex circulator changer to Hot Tank OPERATION TROUBLESHOOTING COOLING MODE Fett Possible Cause Verification Recommended Action Heating instead 1 Control wiring not set up Verify that there is 24VAC across O Correct control wiring or replace of cooling properly or cooling select and C of the terminal strip when relays relays not
63. n the Hot Tank reaches the heating Stage 1 activation temperature the com pressor will start part load mode and the Hot Indoor circulator will be turned on to circulate fluid between the heat exchanger and the tank If the heating load is large enough the Hot Tank will con tinue to drop in temperature When the heating Stage 2 activa tion temperature is reached the compressor solenoid will be energized to operate the compressor in full load mode If the heating load is still too large the Hot Tank will once again continue to drop in temperature When the heating Stage SIMULTANEOUS HEATING AND 3 activation temperature is reached the electric elements will be COOLING LOAD OPERATION brought on When there are both heating and cooling loads pre As the heating load becomes satisfied the Hot Tank will sent the heat pump will operate in the mode that has been set begin to rise in temperature Each heating stage will shut off at as prioriy until the priority tank has been satisfied It will then its setpoint value and the Hot Tank will be satisfied switch to the default mode in order to satisfy the default tank In addition if there is a Stage 1 call on one mode and a Stage 2 COOLING LOAD ONLY OPERATION call of the other mode Dc the compressor will ly As described previously this unit has two cooling stages be set to Stage 2 to complete the cycle as fast as possible in order to switch to the other mode and satisfy the demand
64. nd circulator pump module in one location The hydronic layout may make a particular location ideal for the unit installation If possible the access panels should remain clear of obstruction for a distance of two feet to facilitate servicing and general maintenance Raising the heat pump off the floor a few inches is generally a good practice since this will prevent rusting of the bottom panel of the unit We recommend that the heat pump be placed on a piece of 2 Styrofoam covered with 1 4 plywood The Styrofoam will smooth out any irregularities in the cement floor while the plywood will distribute the weight of the unit evenly over the Styrofoam This process will also deaden the compressor noise emitted from the bottom of the cabinet ELECTRICAL PROVISIONS The heat pump has a concentric 1 093 0 875 knockout for power supply connection to the electrical box There are also two other 0 875 knockouts one for connections to the in door circulator the other for connections to the circulator pump module for ground loop applications There are three 1 2 open ings with plastic grommets grommet hole is 3 8 in the upper section of the electrical box for connections to the controls A schematic diagram and electrical box layout diagram can be found inside the electrical box cover for quick reference on the connections required The electrical box diagram also contains information about the size of wire for the connections as well a
65. nded for Flow Setting To Second Well Field Ditch Pond Etc gn 1 Ball Valve optional Air Bladder Tank Pressure Pressure Gauge Switch 0 60PSIG From C well Pump 125psig NS PRV Air Bladder Tank Table HEAT PUMP Air Bladder Tank Size MODEL SIZE IGAL Litres To House Based on 2 minute well pump run time A larger tank may be used if a longer run time is desired TACO 24VAC Slow Close Water Valve Connect the harness plug to the Generic 24VAC Solenoid Water Valve Connect the harness plug to the connector inside the heat pump ELECTRICAL CONNECTOR g ES NOTE Ensure the pin is installed in the proper orientation as shown here when re instaling the head NOTE Remove the head from the valve before soldering the valve in place ECO IMPL BY APVD BY DATE Drawn By Chris Geddes 1 Checked B Chris Geddes 1 Approved By Chris Geddes Approved By GEDTHERMAL UD Drawing Name connector inside the heat pump ELECTRICAL CONNECTOR Piping is as shown above X 170 Plantation Rd Petitcodiac NB EAZ 6H4 Typical Ground Water Installation for Size 25 75 Heat Pumps Brass FPT 577775 Size Drawing Number REV SHEET 01 MAR 2012 000662MAN 03 GROUND WATER DISPOSAL METHODS Pressure Nordic Pitless Adaptor Water Table Pond
66. nergy ensure they are all open cient than a single tank Setup The DHW loop may have to be purged of air several times before good circulation is obtained A temperature difference between the DHW In and DHW Out can be felt by hand when the circulator pump is operating properly The final tank should be set to 140 F 60 C The pre heat CAUTION If two 2 shut off valves are located on the domestic hot water ines as shown in the diagram a pres sure relief valve must be installed to prevent possible dam age to the domestic hot water circulator pump should both DOMESTIC HOT WATER valves be closed CONNECTIONS A typical piping diagram for a two tank pre heat tank con figurations can be found in drawing 000970PDG at the end of this section Be sure to note the position of the check valve and the direction of water flow Other configurations are possible and there may be multiple units tied together in larger buildings CAUTION Use only copper pipe to connect the desuperheater Should the DHW thermostat fail the water temperature could rise to as high as 200 F 93 C Repeat the above procedure as necessary to ensure that all of the air has been removed then remove the purging equip ment Ensure the tank is filled with water and under pressure before activating the heat pump Slightly loosen the boiler drain on the DHW Out pipe to allow air to escape from the system before the unit is started This step will make ce
67. ons document for the desired model REFRIGERANT CHARGE CHART SHIPPING INFORMATION Table 12 Refrigerant R410a Table 13 Shipping Information Es OA 75 9 0 4 1 65 TBD 86 218 36 91 48 122 System contains POE oil 75 1100 499 86 218 36 91 48 122 STANDARD CAPACITY RATINGS The tables below depict the results of standard capacity rating tests according to C13256 2 which is identical to IS013256 2 Stage 1 values do not apply to single stage units Refer to the Electrical Tables to determine which models are single stage NOTE Due to the setup of this series of heat pumps there is no actual reversing mode the values in the cooling tables are what would be obtained when operating at the given conditions Table 14 Standard Capacity Ratings Ground Loop Heating 60Hz e STAGE 1 ELT 41 F 5 EWT 104 F 40 C STAGE 2 ELT 32 F 0 C Model size Quidgor indoor Pressure Drop Mode Energy COP Outdoor amp Indoor Pressure Drop Energy pacity H IGAL USG L s kPA Watts BTU Hr 37 600 3 27 Stage2 4 380 45 800 3 07 134 Stage 1 3 905 45 600 ea Stage 2 4 740 51 400 15 NaCl by Weight Ground Loop Fluid Table 15 Standard Capacity Ratings Ground Water Heating 60Hz EWT 104 F 40 C ELT 50 F 10 C Liquid Flow Outdoor Input LQuidgon amp indoor Pressure Drop Mode Energy LUSG
68. ooling Zone Circulator is activated by connecting R and CZ together via dry contacts PURGING THE INDOOR SYSTEM There are ball valves and boiler drains inside the unit to facilitate filling and purging Refer to DIAGRAM B and drawing 000421RCD for component locations Once the system has been filled with the desired fluid purging may be done in the following manner Connect a fill hose to the Hot Zone Boiler Drain Connect a drain hose to the Hot Indoor Boiler Drain Close the top isolation valve of the Hot Zone Circulator Close the top isolation valve of the Hot Indoor Circulator Open the Hot Zone and Hot Indoor Boiler Drains Open the fill hose valve Purge until no air can be heard leaving the drain hose Close the Hot Zone Ball Valve and the Hot Indoor Ball Valve 9 Open the top isolation valve of the Hot Zone and Hot Indoor Circulators 10 Close the Cold Indoor Ball Valve 11 Purge until no air can be heard leaving the drain hose 12 Close the Hot Zone and Hot Indoor Boiler Drains 13 Move the drain hose to the Cold Indoor Boiler Drain 14 Open the Cold Indoor Boiler Drain 15 Close the top isolation valve of the Cold Indoor Circulator 16 Open the Cold Indoor Ball Valve 17 Open the Hot Zone Boiler Drain 18 Purge until no air can be heard leaving the system 19 Close the Cold Indoor Ball Valve 20 Close the fill hose valve 21 Close the Hot Zone Boiler Drain and the Cold Indoor Boiler Drain 22
69. operating for a while 3 Verify that the brown wire with the insulated terminal is disconnected in the electrical box Refer to the schematic diagram for more information Electrical 1 Ensure the power to the unit is off 2 Verify all high voltage connections Ensure that there are no stray wire strands all connections are tight and the ground wire is connected tightly to the ground connector Record the fuse circuit breaker size and wire gauge for the heat pump Verify that the control connections to the are properly connected and all control signals are off Turn both breakers off in the unit electrical box so that the unit will not start when the power is turned on Verify that the circulator pumps are connected to the proper voltage terminals in the heat pump Record the voltages of the circulator pumps Ensure all access panels except the one that provides access to the electrical box are in place E 0 mi 000662MAN 03 Page 20 01 MAR 2012 UNIT STARTUP The unit is now ready to be started The steps below outline the procedure for starting the unit and verifying proper operation of the unit It is recommended that safety glasses be worn during the following procedures Preparation 1 2 3 4 Remove the caps from the service ports and connect a refrigeration manifold set to the unit Turn the power on to the heat pump and set all controls including all zone thermostats to OFF Measure the fol
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71. rculator Pump Module should be mounted vertically to minimize the possibility of air locking the circulators e All lines inside the structure and through the wall should be insualted with 3 8 to 1 2 thick closed cell pipe insulation e Holes through the foundation structure should be filled with expanding foam from both sides to prevent leakage e Proper drainage material should be used on the outside of the wall to prevent water buildup e Pump module fittings are available from Maritime Geothermal Ltd Geo Flo Part Numbers are indicated above italics e A pressure gauge is recommended if P T plugs are not installed e The air bladder tank should be pressurized to the desired static pressure of the ground loop before installation e For most applications a 1 pump module will accomodate NORDIC models sizes 25 35 and 45 and a 2 pump module will accomodate sizes 55 65 and 75 The total loop pressure drop including the headers inside piping and heat exchanger drop should be calculated based on the antifreeze mixture and lowest desired entering water temperature The pump module selected must provide the required flow at this calculated pressure drop value CIRCULATOR PUMP MODULE 3 WAY VALVE POSITONS LEFT SIDE VIEW 2 Valve in HP fill purge position 3 Valve in normal running position 1 Valve in Loop fill purge position Ground Loo Ground Loop Ground Loop 170 Plantation Rd Petitcodiac NB EAZ 6H4 awn By te LL ted By
72. rd has an on board LED and a FAULT pin with a 24VAC output An external indicator or relay can be connected across the FAULT pin and ground if external signal ing is desired Should a fault occur the LED will flash the code of the fault condition while the safety control in question is open The codes are shown in TABLE 3 The control board will lock out the compressor for five minutes when a fault occurs Three retries per fault condition are allowed within a 60 minute period If the fault condition occurs a fourth time the control board will permanently lock out the compressor and energize the FAULT pin This can only be reset by powering down the unit The LED will flash the fault code until the unit is reset If the control board enters permanent lockout mode there is a serious problem with the system and it must be rectified if the unit is to maintain good service TABLE 3 Control Board Fault Codes fault co High Pressure Low Pressure WARINING If the the heat pump is permanently locking out on the LOW pressure control repeat N ed resetting of the unit could cause the heat exchanger to freeze and rupture destroying the heat pump and voiding the warranty INDICATOR LIGHTS The EMWT Series unit has three indicator lights on the side of the electrical box They are described in TABLE 4 TABLE 4 Indicator Lights Green Compressor ON Electric Elements ON Fed S Trouble Locked out 01 MAR 2012 LOOP
73. re open Water Lines are full and purged Desuperheater pump wire is disconnected o O o 0 O D o o c D High voltage connections are correct and securely fastened Circuit breaker or fuse size and wire gauge for Heat Pump Circulator pump voltages Outdoor 1 Outdoor 2 Low voltage connections are correct and securely fastened STARTUP DATA Preparation Voltage across L1 and L2 L1 and L3 L2 and L3 Green Light is ON Suction Pressure Discharge Pressure psig kPa Outdoor In Supply In Outdoor Out Supply Out and Delta T L s Heating Mode 10 minutes Outdoor Flow Compressor L1 black wire current Heating aquastat setpoint and discharge pressure at cycle end Domestic Hot Water functioning Yellow light is ON Electric element L1 current draw Suction Pressure Discharge Pressure o psig Ka Outdoor In Supply In Outdoor Out Supply Out and Delta T E me 1 1 Ir fo Cooling Mode 10 minutes Cooling aquastat setpoint and suction pressure at cycle end Final Aquastat Heating S1 Setpoint S1 Delta S2 Setpoint S2 Delta Settings Cooling S1 Setpoint S1 Delta S2 Setpoint S2 Delta Installer Signa Homeowner Signa ture ture F A total of three copies are required one for the homeowner one for the installer and on to be sent to Maritime Geothermal Ltd 000662MAN 03 Page 22 01 MAR 2012 General M
74. ressure Locate the leak and repair it of the unit for a very low value opray nine a sniffer and dye are common methods of locating a leak Fault Code 3 Flow switch jumper re Verify jumper is in place between Place a jumper if missing Flow Switch moved or faulty pins marked FLOW SWITCH Flow switch faulty Verify 24VAC is present between Replace flow switch if signal is Only if installed each flow switch pin on the safety not present at both terminals on board and the C terminal of the ter the safety board minal strip while there is flow through the unit Faulty Safety Board 24VAC is present across each Replace Safety Board FLOW SWITCH terminal and C but not voltage is present across CC on the safety board and C 01 MAR 2012 Page 25 000662MAN 03 Compressor will not start Compressor starts hard Compressor Stage 2 will not activate 000662MAN 03 COMPRESSOR TROUBLESHOOTING Fault gt Possible Cause Verification Recommended Action Reset if tripped If not tripped verify Determine why breaker was tripped Replace breaker if faulty Tripped or faulty compres sor breaker Faulty Safety Board Faulty run capacitor Loose or faulty wiring that there is 230VAC across L1 and L3 of the compressor contactor Measuring from C on the terminal strip verify there is voltage at Y HP1 HP2 LP1 LP2 and both flow pins but no voltage present at CC Replace safety board Replace if fa
75. rshoot as the 000662MAN 03 tank temperature rate of change is reduced when only Stage 1 is active e Prolonged Stage 1 runtime leads to increased overall effi ciency as Stage 1 has a higher COP than Stage 2 e Reduced number of compressor starts The settings may be changed as desired however Stage 1 setpoint for heating should not exceed 120 F 49 C Stage 1 cooling setpoint should not be set below 43 F 6 C Exceeding these setpoint limits will cause the heat pump operating pres sures to approach the safety control settings possibly causing nuisance shut downs TABLE 2 Typical Aquastat Settings Item Setpoint Activation is indirectly set by the Setpoint and Delta values If fan coils are being heated it may be required to in crease the heating setpoints by 10 F 6 C in order to obtain the required heating capacity SAFETY CONTROLS The heat pump has two built in safety controls which are designed to protect the unit from situations which could damage it should the operation of the refrigeration circuit fall outside the allowable operating range A Low Pressure Control The low pressure control monitors the compressor suction pressure and will shut the compressor down if the refrigerant evaporating pressure becomes too low risking the danger of freezing conditions in the evaporator There are 3 main reasons why this control would activate in response to the operating conditions of the unit w
76. rtain that the domestic hot water circulator in the unit is flooded with water when it is started DIAGRAM B Circulator and Major Component Locations DHW Circulator xpansion Tank Hot Indoor Circulator Condenser Cold Indoor Circulator Evaporator Safety Pressure Switch for Electric Backup Cold Tank Hot Tank Cold Zone Probe ircul Circulator Hot Tank Evaporator p Hot Zone Circulator Cold Tank Probe Condenser 1 i d 1 I Filter drier 000662MAN 03 Page 8 01 MAR 2012 alva Ag GAdV Ag 1411 4 003 aaa 80 YYW SZ S30039 9 ES 53003 9 O eseajay ui LO z www lo s30q39 ssacso 9 16 00 20 909599000 Jaquinn Buimelg RE 133HS Ada YH9 273 gN seipoomed aed 94 Ag panrolddy seppa9 suyo pu uonejueld 011 euoz juo N 3NOZ 002 09 ue4 edid Z 102 ue4 adid y p ds ue euo o s peddinbe y paads uey Ce peddinbe jl z p ds uey 20 p ds uey 19 0 joeuuoo BUBIS ue4 O jeubis A PA 3U0Z A jeubis uo juejsuoo BuijooS 49uuoJsueJ jeuisju OVAPZ M JSUOJSUBJ UOUULUOS TYNDIS O HLIM LVLSOWYSHL SAIBA p ds ue euo 99 9S peddinbe y e peads ue4 peddinbe y z pssds ue4 20
77. s Electric Backup Nominal Size 12K 12 kW 65 5 Ton EE EN Indoor Loop Exchanger l C Copper Functions Z Cupro Nickel CuNi H Heating AC Active Cooling Outdoor Loop Exchanger W Domestic Hot Water C Copper Z Cupro Nickel CuNi Refrigeran P R410a Compressor Stages T 22 Stage Voltage Code 1 230 1 60 VAC 2 208 3 60 VAC 6 220 1 50 VAC 7 2 380 3 50 VAC APPLICATION TABLE FUNCTION REFRIGERANT VOLTAGE STAGES OUTDOOR COIL INDOOR COIL REVISIONS 000662MAN 03 Page 2 01 MAR 2012 Table of Contents INSTALLATION INFORMATION ee ENEE RI SIRE E eRE RIO SR n EEN PAGE 5 Bode el go Da EE NE as Page 5 he UNI si n Page 5 Optimum ET eme Page 5 Electrical PrOVISIODS g eegent d aw sa OR ci id anad Page 5 Circulator Pump Module Wiring Ground Loop Only 8 88 88 8 888 Page 5 Control Requirements xa zs eee Page 5 A AP EEEE AO EEE Page 6 MAC AN EE Page 6 LOOP LEFMINQOGY EIE EIE Page 7 internal Hydronic ee re e ETC Page 7 zeige svare Page 7 oan zone o peo PAPA ayna ee E T Page 7 Gooling Zone Conhecllolls EE Page 7 P rging the Indoor SSN o a a a a bi Page 7 Domestic Hot Water Connections
78. s auxiliary electric heaters and geothermal pumping modules built or sold by MG when installed with MG Units for five 5 years from the Warranty Inception Date as defined below 8 Sealed refrigerant circuit components of MG Units which components only include the compressor refrigerant to air water heat exchangers reversing valve body and refrigerant metering device for ten 10 years from the Warranty Inception Date as defined below 4 Other accessories and parts built or sold by MG when installed and purchased with MG Units for five 5 years from the date of shipment from MG b Other accessories when purchased separately for 1 year from the date of shipment from MG The Warranty Inception Date shall be the date of original unit installation as per the date on the installation Startup Record or six 6 months from date of unit shipment from MG whichever comes first To make a claim under this warranty parts must be returned to MG in Petitcodiac New Brunswick freight prepaid no later than ninety 90 days after the date of the failure of the part If MG determines the part to be defective and within MG s Limited Express Residential Warranty MG shall when such part has been either replaced or repaired return such to a factory recognized distributor dealer or service organization freight prepaid The warranty on any part repaired or replaced under warranty expires at the end of the original warranty period LIMITED
79. s the recommended breaker size A properly qualified electrician should be retained to make the connections to the heat pump and associated controls The connections to the heat pump MUST conform to local codes 01 MAR 2012 Page 5 CIRCULATOR PUMP MODULE WIRING GROUND LOOP ONLY The heat pump has provisions for connecting the circulator pump module so that the pumps will be turned on whenever the compressor operates Connect the circulator pump module to the appropriate two terminals of the terminal strip marked OUTDOOR CIRCULATORS in the heat pump as per the volt age of the circulator pump module Ensure that the total current draw of all circulators connected to the terminal strip does not exceed the value indicated on the label in the heat pump electri cal box Refer to the electrical box drawing on the electrical box cover for more information CONTROL REQUIREMENTS The heat pump comes equipped with a two stage heating aquastat and a two stage cooling aquastat The stages are S1 Stage 1 compressor and S2 Stage 2 compressor as well as auxiliary heat on a 0 2 hour timer The EMWT unit operation is self sufficient the only control signals required are to turn on the Heating and Cooling Zone Circulator s located inside the unit The electrical box diagram on the electrical box cover pro vides a description of the signal connections in the heat pump They are also listed in TABLE 1 below The Heating Zone circulator is a
80. t placed for single stage units 4 4 ES Select Relay Coil 1 1 4 White Black Stripe units Safety Cut out 7 Heating Zone Circulator Relay Coil Cooling Zone Circulator Relay Coil White Black Stripe Drawn B Date 170 Plantation Rd 000191 C GEDDES C GEDDES 01 MAR 12 BW FS MAY 07 MARITIME GEOTHERMAL TIL Checked B Dat 000125 C GEDDES C GEDDES 21 NOV o8 Ehecked ate MAY 07 000117 C GEDDES C GEDDES 114 MAY 08 Approved By ENG Date hris Geddes E4Z 6H4 Drawing Name 000110 C GEDDES MAY 07 EMWT HAC 1T Schematic Diagram 01 Initial Release C GEDDES C GEDDES 17 MAY 07 A d B Dat ECO 4 IMPLBY APVD BY DATE B 01 MAR 2012 Page 41 Size Drawing Number REV SHEET 0004535 000662MAN 03 inued bm C Q S T Ka e al Y 3 Q Q x x Q a Wy 48139 000 Kat 133HS Ada welbelg xog E9H 99 3 aas LU VH LMN SWEN Buimelg WAHL nun VH9 Zv3 gN uonejueia 02 Ho dund oy um jueJodua o p sn eq Aew 44O NO Jeulajxa sy pajoeuuoo a32u0 uns eq jou JSNWI pue poejeouqn Jajem 51 duwnd eut ale pojeoo Jeur pajejnsul SU YIM SJM UMOJG oU SAOLUSI J9JeM UM pepooj pue XUE Jajem au O pejoeuuoo JojejnoJo JOY OU pejessdo eq oj s dund jesy 1 A
81. t pump Although many different antifreeze solutions have been employed in geothermal systems the alcohols such as methanol or ethanol have the most desirable characteristics for groundloop applications The overall heat transfer characteristics of these fluids remain high although care must be taken when handling pure alcohols since they are extremely flammable Once mixed in a typical 25 by volume ratio with water the solution is not flammable In situations where alcohols are not allowed as a loop fluid due to local regulations then propylene glycol is a non toxic alternative which can be substituted Propylene glycol should only be used in cases where alcohols are not permitted since the heat transfer characteristics are less desirable and it becomes more viscous at low temperatures increasing pumping power The volume of fluid that your loop system holds can be closely estimated by totaling the number of ft of each size pipe in the system and referencing TABLE 11 the for approximate volume per 100 ft When the volume of the loop has been calculated and the appropriate amount of antifreeze is ready for addition by referencing TABLE 10 drain the equivalent amount of water from the flush cart or mixing barrel and replace it with the antifreeze When using alcohols be sure to inject below the water line to reduce initial volatility of the pure antifreeze If the loop is large it may be necessary to refill the tank with antifreeze sev
82. tallations TABLE 8 Heat Pump Size vs Heated Area or a Ground Water System Sze fone Sat 6 3800 THE TABLES ABOVE ARE FOR INFORMATION ONLY THEY SHOULD NOT BE USED TO SELECT A UNIT SIZE They simply show on average what size unit is required for a typical two level home main level and below grade basement with R 20 walls R 40 ceiling and average size and number of windows The Heated Area is the area of the main level The tables account for a basement the same size as the heated ar ea MARITME GEOTHERMAL LTD HIGHLY RECOMMENDS THAT A PROPER HEAT LOSS GAIN ANALYSIS BE PER FORMEDE BY A PROFESSIONAL INSTALLER WITH CSA APPROVED SOFTWARE BEFORE SELECTING THE SIZE OF UNIT REQUIRED FOR THE APPLICATION For heating dominant areas we recommend sizing the unit to 100 of the heating design load for maximum long term efficiency with minimal supplementary heat The unit should be in stalled as per CSA 448 2 02 For ground loop applications the ground exchanger should be designed using suitable software with a multi year analysis There are many factors to consider when sizing the heat pump Some of these factors include the number of levels the size of the windows the orientation of the home attached gar age bonus rooms walk in basement coldest outdoor tempera ture etc The heat loss program will take all of these factors into consideration in its calculations An undersized installation will require not be as effi
83. that the exact amount of water flowing can be determined at a glance It should be placed between the Out door OUT Supply OUT pipe of the heat pump and the water valve With proper flow there should be 5 7 F 3 4 C delta T between the IN and OUT water temperatures of the heat pump when operating in the heating mode All water line valves on both the supply and discharge lines should be either BALL or GATE valves GLOBE valves have a higher pressure drop meaning more pumping power to maintain the required flow to the heat pump PIPE INSULATION All ground water piping to and from the Outdoor Loop ports on the heat pump should be insulated with 3 8 closed cell pipe insulation to prevent condensation and dripping onto floors or walls WATER DISCHARGE METHODS Water disposal methods vary from area to area However some consideration should be made to prevent the cooled discharge water from immediately coming in contact with the supply source Attempting to return the water to the source well will eventually cool the water so much that the heat pump will shut off on its low pressure safety control Acceptable methods for disposing of the waste water are listed below The waste water is clean the heat pump has no other effect than reducing the temperature of the water Refer to the Ground Water Disposal methods diagram for typical disposal method diagrams Second well return well Percolation Drain ditch leaching field
84. the EMW Series the buffer tank is part of the heat pump unit The heat pump s sole purpose is to maintain the buffer tank set point Its operation is independent of the zone operation Fan coils can be used to provide heating and or cooling for areas that do not have radiant in floor heating They provide a means of air heating cooling with minimal or no ductwork Note that the buffer tank temperature should be set for 115 F 46 C if there are fan coils in the system Four port fan coils are recommended for connection to the system to keep separate piping for heating and cooling zones as there are individual hot and cold tanks in the unit It is recommended that all piping be insulated with 3 8 thick closed cell pipe insulation This is a MUST for any piping that is used for cooling to prevent dripping onto floors and walls Care should be taking when wiring the system to ensure that radiant in floor heating zones are disabled whenever the heat pump is switched to cooling mode 000662MAN 03 Page 12 01 MAR 2012 Typical Zone Types for Hydronic Applications Floor Zone 1 Floor Zone 1 Valve Floor Zone N Floor Zone N Valve Fan Coil 1 Zone Valve Only if Fan Coil does not have a valve Fan Coil 1 Zone Valve Only if Fan Coil does Zone Zone not have a valve Return Supply Hea
85. tor pump is not working No 24VAC signal present across V and C of the heat pump terminal Strip Other zones work 24VAC is present across V and C of the heat pump terminal strip but no hot water reach es the zone Verify that all valves in the zone loops are open including isolation valves at the zone circulator inside the unit 24VAC is present across V and C of the heat pump terminal strip but the contactor does not energize Or contactor is energized but 115VAC is not present across the wire on the load terminal and ground 115VAC is present across the wire on the load terminal of the cold zone circulator and ground but circulator pump is not working Page 31 Locate the problem and correct tt Clean or replace zone valve s Open any valves that are closed Replace contactor Close isolation valves and re move circulator pump head Veri fy operation of the impeller Clean or replace if faulty Locate the problem and correct tt Clean or replace zone valve s Open any valves that are closed Replace contactor Close isolation valves and re move circulator pump head Veri fy operation of the impeller Clean or replace if faulty 000662MAN 03 DOMESTIC HOT WATER DHW TROUBLE SHOOTING Fault Possible Cause Verification Recommended Action Insufficient hot Thermostat on hot water Visually inspect the setting Readjust the setting to 120 F water tank set too low Shoul
86. trical box cover and the access panel on the heat pump Install the service port caps securely to prevent refrigerant loss Do a final check for leaks in the ground water ground loop system and ensure the area is clean Turn the power to the unit on Set all zone thermostats to the desired values Startup Record 1 The installer shall sign and date the bottom of the Startup Record and then have the homeowner sign as well The installer shall leave the Startup Record with the homeowner retain a copy for filing and send a copy to Maritime Geothermal Ltd for warranty registration 01 MAR 2012 Page 21 000662MAN 03 Startup Record Sheet EMWT HACW Series Size 25 75 Two Stage R410a Installation Site Startup Date Installer Province Country Homeowner Phone Model Homeowner Name Serial Check boxes unless asked to record data Circle data units PRE START INSPECTION Heating and Cool All shut off valve are open full flow available ing Zone Loops Loop is full and purged of air Antifreeze type Antifreeze concentration Volume Weight o O o 0 O D o o c D Ground Loop All shut off valve are open full flow available system Loop is full and purged of air Antifreeze type Antifreeze concentration Ground Water Water Valve installed in return line Flow control installed in return line Domestic Hot All shut off valves a
87. ttent Cold Indoor Loop circulator heat ex changer to Cold Tank Check that isolation flanges and any ball valves are open Verify 115VAC to pump Check gauges for pressure drop Internal hot circulator is pumping instead of internal cold circulator Adjusting the TXV does not affect the superheat or the suction pres sure TXV may be frosting up Entering air temperature and air flow are good but suction is low Check static refrigeration pressure of unit for very low value Pressures change only slightly from static values when compres sor Is started Adjusting the TXV does not affect the superheat or the suction pres sure Points pitted or burned Contactor sometimes sticks causing the compressor to run without the fan tripping the low pressure control Verify wiring is good Page 29 Ensure flow path is unrestricted Replace pump if faulty Replace relay Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Locate the leak and repair it Spray nine a sniffer and dye are common methods of locating a leak Replace compressor Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Replace contactor Correct the wiring or replace the circulator 000662MAN 03 ELECTRIC HEAT TROUBLE SHOOTING Verification No Electric Heat Low Electric Heat 000662MAN 03 Tripped or faulty electric h
88. ulty Fix any loose connections Re place any damaged wires Check value with capacitance meter Should match label on capacitor Check all compressor wiring includ ing inside compressor electrical box Faulty compressor contactor Voltage on line side with contactor held closed but no voltage on one or both terminals on the load side Points pitted or burned Or 24VAC across coil but contactor will not engage Replace contactor Thermal overload on compressor tripped Ohmmeter shows reading when placed across H and S terminals and infinity between C amp R or C amp S A valid resistance reading is present again after the compressor has cooled down Proceed to Operation Trouble shooting to determine the cause of the thermal overload trip Burned out motor open winding Burned out motor shorted windings Motor shorted to ground Seized compressor due to locked or damaged mechanism otart capacitor faulty Potential Relay faulty Compressor is tight due to damaged mechanism Faulty Stage 2 module Remove wires from compressor Ohmmeter shows infinite resistance between any two terminals Note Be sure compressor overload has had a chance to reset If compressor is hot this may take several hours Replace the compressor Remove wires from compressor Re sistance between any two terminals is below the specified value Replace the compressor Remove wires from
89. ur to repair or replace the same which is incurred as a result of a defective part covered by MG s Limited Residential Warranty 2 The costs of labour refrigerant materials or service incurred in diagnosis and removal of the defective part or in obtaining and replacing the new or repaired part 3 Transportation costs of the defective part from the installation site to MG or of the return of that part if not covered by MG s Limited Express Residential Warranty 4 The costs of normal maintenance m x This Limited Express Residential VVarranty applies to MG Residential Class products manufactured on or after February 15 2010 MG S LIABILITY UNDER THE TERMS OF THIS LIMITED WARRANTY SHALL APPLY ONLY TO THE MG UNITS REGISTERED WITH MG THAT BEARS THE MODEL AND SER AL NUMBERS STATED ON THE INSTALLATION START UP RECORD AND MG SHALL NOT IN ANY EVENT BE LIABLE UNDER THE TERMS OF THIS LIMITED WARRANTY UNLESS THIS INSTALLATION START UP RECORD HAS BEEN ENDORSED BY OWNER amp DEALER INSTALLER AND RECIEVED BY MG LIMITED WITHIN 90 DAYS OF START UP Limitation This Limited Express Residential Warranty is given in lieu of all other warranties If not withstanding the disclaimers contained herein it is determined that other warranties exist any such express warranty including without imitation any express warranties or any implied warranties of fitness for particular purpose and merchantability shall be limited to the duration of the Limited

EMWT HACW Manual - Nordic Geothermal Heat Pump

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