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EMWT HSCW Manual - Nordic Geothermal Heat Pump

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Contents

1. W JS S v 3 5 C Q S T Q S 7 O x Q q E Q ar W O euoz Buiooo E JISIS SISIe S SS uo ZO pue y j euuo2 d A euoz Buneeu SA UA 9 AA PUE d PEU S1Nd1NO OVAVC euoz Zo Ne euoz ZH J peles yueL f OVAVZ y boue UOWWOD 3 pue 110125 ebejs 09 1 022 802 2911399 3 41 01 2012 CASE DETAILS 34 34 THERMOSTAT CONTROLS WIRE 3 ELECTRICAL SERVICE Front View 41 1 2 41 1 2 DHW IN 1 2 DHW OUT 4 2 FPT GROUND LOOP OUT 1 GROUND LOOP IN 1 COLD LOOP 1 COLD LOOP IN 1 HOT LOOP OUT 1 HOT LOOP IN PRESSURE RELIEF DRAIN 1 2 Back View 000664MAN 04 Page 42 01 MAR 2012 CASE DETAILS continued Right Side View 01 MAR 2012 Page 43 000664MAN 04 30 LIMITED EXPRESS WARRANTY ti is expressly understood that unless a statement is specifically id
2. 23 GENERAL MAINTENANCE mnnn PAGE 24 TROUBLESHOOTING GUIDE _ _ _ ___ PAGE 25 2 2 D Ped RN EREA AAA Page 33 Helrigeration Circuit Diagrams e saspe ouv e Dude en sess dues incu use E MEE Page 34 MODEL SPECIFIC INFORMATION n PAGE 35 Heiridgerant Charge ooo RENTE 35 ufo AAPP PP AA a 35 Standard Capacity Ratings cus uu Eos tia Page 35 Capacily So Eon _ ___ SEE sd n RD dr Page 37 Electical TaDlOS unen iia Page 39 Electrical Diagrams 230 1260 5 cornisa sas Page 40 SA PF nn PP Page 42 WARRANTY INFORMATION 2 eects ee steerer as ica PAGE 44 000664MAN 04 Page 4 01 MAR 2012 Tables Diagrams and Drawings TABLES Table 1 Control Signal Descriptions 6 Table 2 Typical Control Settings 2 esu Pag
3. Preparation Voltage across L1 and L2 L1 and L3 L2 and L3 5 Cold Tank Limit Suction Pressure when outdoor pump module turns Data 2 minutes Suction Pressure Discharge Pressure BEEN psig kPa after outdoor Outdoor In Supply In Outdoor Out Supply and Delta T Out Outdoor Flow mE Igom s Compressor L1 black wire current Heating aquastat setpoint and discharge pressure at cycle end EE F Domestic Hot Water functioning Yellow light is ON Electric element L1 current draw Hot Tank Limit Discharge Pressure when outdoor pump module turns on psig kPa Final Controller Heating S1 Setpoint 51 Delta S2 Set S2 Delta S3 Set S3 Delta po Settings 9 Cooling 51 Setpoint S1 Delta 82 Set S2 Delta A total of three copies are required one for the homeowner one for the installer and on to be sent to Maritime Geothermal Ltd 01 MAR 2012 Page 23 000664MAN 04 General Maintenance 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
4. JOOPINO JOOpU m OSI dung Joopu oL Joopu Joopu JA IVA JONG gt gt AVM 4 aqold pei iea saog resi jaog 178 5 7 no NI 907 9402 auo 9007 9907 i93 07 pjoo 02 _ SAMBA INEA gt AOSI gt gt eg de OSI ieg 110 1no jdung 198 M euoz 5 99 9UOZ 7 907 WINDING 10H ME 7 7 poo di 5949 95 H LMIN uoisuedx3 01 MAR 2012 Page 34 000664MAN 04 Model Specific Information This section provides general information particular to each model For complete specifications please see the specifications document for the desired model REFRIGEHANT CHARGE CHART SHIPPING INFORMATION Table 21 Refrigerant R410a Table 22 Shipping Information L H 75 9 0 4 1 65 TBD 86 218 36 91 48 122 System contains POE oil 75 TBD 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 15013256 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 seri
5. Page 6 Circulator Pump Module Wiring iaa Page 6 Control Requirements escocia mision UNE Eua EE DISP Page 6 cci e C 7 7 EOOD A Page 7 internal Hydronic 8 TA e Page 8 Heating Zone A PP eer re 8 Zone COMMCCIIOINS EE 8 AAA gt 8 Domestic Hot Water Connections 9 CONTROLS AND 5 12 Controller Inputs and OUIDUIS sodio ____ Page 12 Cooling Only SW o 12 uicit Page 12 success 12 THEORY OF OPERATION PAGE 14 A uS UE dcos Pe DERE USUS Page 14 Compressor uso atico diestra aro Page 14 Operation SCOnarnoS iio e 14 Heatin
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8. MARITIME GEOTHERMAL Installation and Service Manual NORDIC amp EMWT HSCW Series Two Stage R410a Model Sizes 65 75 Two Tank Simultaneous Heating amp Cooling Hydronic Geothermal Heat Pumps Maritime Geothermal Ltd Email info nordicghp com P O Box 2555 Web www nordicghp com Petitcodiac 42 6 4 Document Number 000664MAN 04 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 HSCW P 1 T CC 12K xx Series e La Revision EMW Energy Mo
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11. closed too far Verify superheat should be be Adjust TXV to obtain 8 12 F tween 8 12 F 3 6 Superheat 3 6 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 superheat or the suction pres few times to loosen it Replace 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 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 Dirty or fouled heat ex Disconnect the outdoor loop lines Have a qualified service technician changer condenser and check the inside of the pipes backflush the system for scale deposits 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 Low Suction Low or no flow in Cold Check that isolation flanges and Ensure flow path is unrestricted Pressure Indoor Loop condenser to any ball valves are open Verify Replace pump if faulty Cold Tank 115VA
12. Simultaneous Heating and Cooling elclelele a 79 7179 4 F G n d White 4 230 Outdoor Loop __ Run Cap Circulator Contacto MN EN BREAKER ata Start Cap 9 5 115VAC Cold Indoor DIVI L Circulator Evaporator 2 2 115VAC Hot Indoor 5 Circulator Condenser 6 9 1 m z Y 115VAC DHW Compressor Circulator Pump FEE Contactor e 1 22 L Heating OFF Hot Water 6 Storage Tank Limit L NOTE mes 3 Connect the brown wire with the p insulated terminal to the bottom left terminal of the compressor contactor L 2 T Heater T1 marked A once lines are filled y 222 e ko and purged The DHW ON OFF 4 59 j da Elements SWITCH can be used to enable naicator disable th 115VAC Heating Zone L Amber a Heating Zone Circulator 1 Circulator Contactor bl Electric Heat 5154 Contactor NX 3131 NOTE For 208VAC move the red wire NOTE In case of short or overload 415VAC Cooling Zone 100VAC E M 74 connected to the 240 terminal of the rectify the problem and press black Cooling Zone Gitenlator Control transformer to the 208 terminal button on transformer to reset breaker Circulator Contactor Transformer White Black Stripe Required Connections Compressor Contactor Coil White Black Stripe ON Manual High Pres Green LONWORKS S White Black
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14. DHW IN 1 2 FPT HEAT PUMP CONNECTIONS 1 2 Union m 1 gt 12 1 2 Boiler Valve Valve Drain 1 2 COPPER LINES Insulate with 5 8 pipe insulation Ball Valve Y OPTIONAL must install both 125pisg 1 2 Valve DHW OUT 1 2 1 2 FPT MET NOTE Refer to the heat pump labels for connection locations Domestic COLD IN from well DHW IN 1 2 FPT 01 MAR 2012 EAT Chris Geddes 10 MAR 09 ___ ___ Chris Geddes 10 MAR 09 ___ Approved ENG Date A Approved Initial Release GEDDES C GEDDES 110 MAR 09 Sz REV Eco IMPLBY APVD BY DATE 9949 Ball Valve 125psig _ Pressure Relief Valve Insulated Domestic Water Pre Heat Tank Pressure Relief alve Insulated Domestic Hot Water Pre Heat Tank Drawing Name Page 11 GEOTHERMAL Ball Valve Domestic HOT OUT to house or mixing valve 125psig Pressure Relief Valve 120 140 50 60 Electric Or Gas Insulated Domestic Hot Water Tank Domestic HOT OUT to house or mixing valve 125psig Pressure Relief Valve 120 140 50 60 Electric or Gas Insulated Domestic Hot Water Tank 170 Plantation Rd Petitcodiac NB E4Z 6H4 Single Unit Connection DHW Pre Heat Tank Brass FPT Size Drawing Numbe
15. Replace contactor Close isolation valves and re move circulator pump head Veri fy operation of the impeller Clean or replace if faulty 000664MAN 04 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 water tank set too low Should 140 if required by local code Tank Problem be set at 120 F 140 F 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 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 r
16. TABLE 1 Control Signal Descriptions Description Heating Zone Circulator Cooling Zone Circulator The Heating zone circulator is activated by connecting R and HZ together via dry contacts The Cooling Zone circulator is activated by connecting R and CZ together via dry contacts 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 Drawing 000665CDG depicts a typical wiring diagram This drawings represent a basic system It is recommended that the system be designed by a qualified system designer to en sure proper functionality The EMWT HSCW unit does not have a dedicated heating or cooling mode It fulfills both functions anytime the compressor is operational 01 MAR 2012 TABLE 2 shows typical settings for the heating and cool ing stages With these settings Stage 1 will activate when the tank temperature reaches the activation point If the load is too great the heating tank temperature will continue to drop when heating or the cooling tank will continue to rise when cooling until Stage 2 is activated If the load is still too great Stage 3 will activate As the heating tank temperature stops dropping and begins to increase or the cooling tank stops rising and begins to decrease Stage 3 will turn off before Stage 2 and Stage 2 will turn off before Stage 1 There are three main ad vantage
17. Ground Loo Ground Loop Ground Loop 170 Plantation Rd Petitcodiac NB EAZ 6H4 awn By te ___ ted By Dale 08 was oras EE Name Geo Flo Circulator Pump Module E A 05 DEC 08 Installation Brass Initial Release GEDDES C GEDDES 09 DEC 08 Size Drawing Number REV SHEET Vi ate ow o A 000906PDG 01 1 of 1 01 MAR 2012 A I lt m Q O 53 r lv lt D lt lt 000664 04 20 Startup Procedure The following steps describe how to perform the startup procedure of the geothermal heat pump The EMWT HSOCW 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
18. Locate the leak and repair it opray nine a sniffer and dye are common methods of locating a leak Replace low pressure control if 5VDC is present Replace controller if no voltage is present and the Service 1 display Low Lockout parameter shows 1 01 MAR 2012 Compressor Will not start Compressor starts hard Compressor Stage 2 will not activate 01 MAR 2012 COMPRESSOR TROUBLESHOOTING Possible Cause Manual High pressure control tripped Tripped or faulty com pressor breaker Verification Press the button on the control it will click when pressed Reset if tripped If not tripped verify that there is 230VAC across L1 and L3 of the compressor contactor Recommended Action Proceed to Operation Trouble shooting to rectify the problem Determine why breaker was tripped Replace breaker if faulty Faulty controller Faulty run capacitor Compressor Low LED is on but no 24V across the compressor contactor coil Check value with capacitance meter Should match label on capacitor Replace controller Replace if faulty Loose or faulty wiring Check all compressor wiring including inside compressor electrical box Fix any loose connections place any damaged wires Faulty compressor contactor Thermal overload on compressor tripped Voltage on line side with contactor held closed but no voltage on one or both terminals on the load side Points pitted or
19. 04 Page 36 01 MAR 2012 CAPACITY HATINGS Heating Data EMWT 65 HSCW P 1T Nominal 5 ton R410a 60 Hz Watts Watts W W BTU Hr F BTU Hr 2 Los 57 542 20 26 0487 s a 4 230 4 304 4 538 4 545 4 607 4 396 4 412 4 477 4 486 4 709 4 716 4 778 2 90 3 12 D 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 E 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 Ww 5 loin o CO gt Co o 40 0 104 0 40 0 20 219 74 405 21 800 7 2 542 124 42 15 535 50 120 596 84 58 398 4613 10 0 54 2 153 47 17 110 19 6 4 784 4 56 Compressor ZPS51K4E PFV T BTU Hr EER em OF Watts COPc 7 s T Watts Watts Igom am F BTU Hr L min ale im Watts Igom L min 12 0 54 2 12 0 0 6 54 2 12 0 oC 45 7 7 9 Wam 6 as 7468 77 2748 122 2515 209 59 a 77 s mes O1 h D 2 es 74637 73 8010 2967 198 3359 158 7 4i wew ass 2 Compr
20. 2012 Page 5 000664MAN 04 Installation Information UNIT DESCRIPTION The EMWT Series unit is a high efficiency two stage geo thermal heat pump Two stage units offer a significant efficiency increase over single stage units when operating in the reduced capacity mode Stage 1 The unit contains R410a refrigerant which is an environmen tally friendly refrigerant R410a is also a more efficient refriger ant than R22 or R407c 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 and circulator pump module in one location The hydronic layout may make a particular loca
21. A Evaporator HEP SFR 2t y A A 1 Cold Tank Cooling Zone Circulator Evaporator Cold Tank Probe gt E JH M I X I I I I I F I I 1 f TXV 01 MAR 2012 Page 9 Hot Indoor Circulator Condenser xpansion Tank Safety Pressure Switch for Electric Backup Hot Tank Probe Hot Tank Heating Zone Circulator Condenser Filter drier 000664MAN 04 133HS A3 JequinN Sseues MOSH LMWA PUNIM 9 02 9 eoid vH9 273 011 aa 1019 edid 7 EOD euoz 970 VOM A H D euoz 0 jejsouueu 99 0 7 8 e qeo y 81 ugy KATATE ELELTEZ ul 4 ARE eJ jejsouuou 2 7783 yeop 9 9 009 189H JO euoz N 3NCZ 02
22. 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 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 000664MAN 04 Page 16 01 MAR 2012 Typical Zone Types 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 T not have a valve Fan Coil 1 Zone Valve Only if Fan Coil does Zone Zone not have a valve Return Supply Hea
23. Faulty compressor contac tor Intermittent Cold Indoor Loop circulator condenser to Cold Tank Intermittent Outdoor Loop circulator Measure temperature Should be above 60 F 15 C Adjusting the TXV does not affect the superheat or the suction pressure TXV may be frosting up Entering liquid temperature flow and entering air temperature are good but suction is low Check static refrigera tion pressure of the unit for a very low value Pressures change only slightly from static values when compressor is started 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 pressure Low super heat and discharge pres sure Compressor See Low Suction frosting up Pressure in this section Adjusting the TXV does not affect the superheat or the suction pressure Verify wiring and motor are is good Points pitted or burned Contactor sometimes sticks causing the com pressor to run when it shouldn t Verify wiring and motor are good Verify wiring contactor and motor is good Page 29 Restrict Heating Zone flow tem porarily until Hot Tank comes up to temperature 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 opray nine a sniffer and dye are common methods of locating a leak compre
24. 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 STEP 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 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 B
25. Hot Tank cool down until Heating Stage 3 is activated at 85 F 29 C Close the heating zone s Verify the DHW IN and DHW OUT temperatures if applicable 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 10 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 a clamp meter and record the value It should be between 45 and 52A 11 Open a cooling zone or zones and let the Cold Tank warm up The Hot Tank temperature will rise as well Record the discharge pressure when the outdoor pump module turns on to cool the Hot Tank the default value is 11432 46 Note that the compressor must be kept running by a cooling call in order to do this step Omit this step if this is not possible at the time of the startup Final Inspection Turn the compressor breaker off Set the controller 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 electrical box cover and the access panel on the heat pump Install the service port caps securely to prevent refrigerant loss Do final check for leaks in the ground loop system and ensure the area is clea
26. 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 E DIAMETER OF 304 STAINLESS STEEL ITH UNION NUT Protective Cover included M TAS ESS THREAD VALVE RETAINER 000664MAN 04 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 s
27. Stripe Common C R410a 610psig em Compressor Indoor Stat HZ Stage 2 ATING NETWORK White Black Stripe o Indoor Stat CZ COOLING z 4 S Electric Heat 10 psig Contactor Coil Electric Heat Safety Cut out A dry contact closure between R and HZ activates the heating White Black Stripe White Black Stripe LONWORKS INPUTS NETWORK Button TROUBLE Outdoor Loop Circulator zone circulator pump a diosa Contactor Coil PAPAS E 5 Cooling 7 Pres A dry contact closure R410a 565psig between R and CZ Hot probe Switch activates the cooling Low Pres zone circulator pump Cold Probe R410a 55psig qu pHeating Zone Circulator Contactor Coil Cooling Zone Circulator Contactor Coil 4 White Black Stripe 000191 C GEDDES C GEDDES 000125 GEDDES C GEDDES 000085 C GEDDES C GEDDES eram dd 07 z 170 Plantation Rd ris Geddes Petitcodiac NB chs ki GEOTHERMAL Chris Geddes T JAN 07 42 6H4 Approved By GET Drawing Name Chris Geddes 11 JAN 07 EMWT HSC 1T Schematic Diagram C GEDDES x Size Drawing Number REV SHEET Eco MPL Bv BY SE a 000355SCH 04 1 of 1 000664 04
28. Verify that the loop contains the proper mix of antifreeze if used for the intended application If applicable 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 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 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 operating for a while 3 Verify that the brown wire with the insulated terminal is disconnected in the electr
29. a minimum of 12PSIG Maritime Geothermal Ltd Shall not be responsible for damages injury or death resulting in failure to follow these instructions Units are shipped with the electric heat breaker in the off position and there is a safety switch which will not allow the element to turn on below 10PSIG 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 19 for details of freeze protection provided by different concentrations TABLE 19 Antifreeze Percentages by Volume Protection to 154 20 Methanol 21 16 Propylene Glycol 30 22 NOTE Add enough antifreeze to allow for a temperature 20 F lower than the expected lowest loop fluid temperature entering the heat 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 fl
30. and HZ together via dry contacts COOLING ZONE CONNECTIONS The Cooling Zone ports are 1 FPT brass fittings refer to CASE DETAILS on page 35 The cooling zone header pipes can be connected to these ports The Cooling Zone Circulator is activated by connecting R and CZ together via dry contacts PURGING THE UNIT There are ball valves and boiler drains inside the unit to facilitate filling and purging Refer to DIAGRAM B and drawing 000346RCD for component locations Once the system has been filled with the desired fluid purging of the internal loops may be done in the following manner The Hot Indoor Loop condenser and Hot Zone Loop can be purged in the following manner Connect the fill hose to the Hot Indoor Boiler Drain Connect the drain hose to the Hot Zone Boiler Drain Close the Hot Indoor Ball Valve Close the Hot Zone OUT Ball Valve Open the Hot Zone Boiler Drain and drain hose valve Open the Hot Indoor Boiler Drain and fill hose valve Purge until air can no longer be heard leaving the drain Close the Hot Zone Ball Valve Open the Hot Indoor Ball Valve 10 Purge until air can no longer be heard leaving the drain 11 Close the Hot Indoor Ball Valve 12 Close the Hot Zone Ball Valve 13 Open the Hot Zone OUT Ball Valve 14 Purge until air can no longer be heard leaving the drain P Se The Cold Indoor Loop evaporator and Cold Zone Loop can be purged in the following manner Connect th
31. aq edA 9UOZ JO SUOZ jse ay 2107 duind jesy JO papinold sjoejuoo pue 5 Z pejoeuuoo sjejsouueu jueJejip Mou SMOUS osje pue jeujeBoj seuoz moy SMOUS j suwajs s que MOSH LMNW3 au 10 e sjoidep 541 SALON euoz ay seziBjeua A y euoz ay sazibiaua oj y Bunoeuuoo euoz 79 euoz ZH jeule3u OVAPZ y 9 s euBis 8911199 3 A ole blo O 2 ce ZO ZHMO e D QQ WD e21129 3 jeoH 01 2012 10 000664 04 Single Unit Connection to Domestic Hot Water Pre Heat Tank Brass FPT Top Port Configuration Domestic COLD IN from well HEAT PUMP CONNECTIONS 1 2 Union mE DHW OUT 1 2 1 2 1 2 Ball Check Boiler Valve Valve Drain NOTE to the heat pump labels for connection locations 1 2 COPPER LINES Insulate with 5 8 pipe insulation OPTIONAL must install both
32. box if any Potential Relay faulty Replace with new one and verify com pressor starts properly Replace if faulty Compressor is tight due to damaged mechanism Faulty controller Faulty Stage 2 module Compressor attempts to start but trips its internal overload after a few seconds Run capacitor has been verified already Compressor High LED is on but no 24V across pin 11 D02 of the controller out put connector and C of the terminal strip 24VAC is present across pin 11 D02 of the controller output connector and C of the terminal strip Page 27 Attempt to rock compressor free If normal operation cannot be es tablished replace compressor Replace controller module if signal is pre sent 000664MAN 04 OPERATION TROUBLESHOOTING raul Possible Cause Verification Recommended Action _ High Discharge Low or no flow Hot Check that isolation flanges and Ensure flow path is unrestricted Pressure Indoor Loop condenser to any ball valves are open Verify Replace pump if faulty Hot Tank 115VAC to pump Check gauges for pressure drop Faulty controller Valve to Hot Tank LED is on but no Replace controller 24VAC across pin 7 DO4 and C of the terminal strip Faulty three way valve 24VAC signal to valve head but Replace valve head and or valve valve head valve is not directed to the Hot Tank Head can be removed to verify if it moves
33. burned 24 across coil but contactor will not engage Ohmmeter shows reading when placed across and S terminals and infinity between R or C amp S A valid re sistance reading is present again after the compressor has cooled down Replace contactor 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 Start capacitor faulty 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 Remove wires from compressor Re sistance between any two terminals is below the specified value Hemove wires from compressor Check for infinite resistance between each ter minal and ground Compressor attempts to start but trips its internal overload after a few seconds Run capacitor already verified Check with capacitance meter Check for black residue around blowout hole on top of capacitor Replace the compressor Replace the compressor If any terminal to ground is not infinite replace the compressor Attempt to rock compressor free If normal operation cannot be established replace compressor if faulty Remove black residue in electrical
34. can handle for ground loop installations TABLE 18 Heat Pump Size vs Heated Area for a Ground Loop System THE TABLE ABOVE IS FOR INFORMATION ONLY IT SHOULD NOT BE USED TO SELECT A UNIT SIZE It simply shows 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 table ac counts for a basement the same size as the heated area 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 10096 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 effici
35. 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 circulator pump is not working No 24VAC signal present across V and of the heat pump terminal strip Other zones work 24VAC 15 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 15 energized but 115VAC is not present across the wire on the load terminal and ground 115VAC 15 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 it 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 it Clean or replace zone valve s Open any valves that are closed
36. period of time any residual air in the system should be bled off and the static pressure should be verified 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 000664MAN 04 Geo Flo Circulator Pump Module Installation Units with Brass FPT Fittings Air Bladder 2911 1 to 1 1 4 PE Socket DIGNI 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 mc a H Connect wiring to appropriate voltage terminals marked OUTDOOR CIRCULATORS in Boiler Drain the heat pump electrical box P 2 nd NOTE 1 or 2 Basement Refer to the heat pump labels pump Wall module for connection locations HEAT PUMP P T PI CONNECTIONS 999 c OUTDOOR IN e lt 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 gt 3144 1 Sweat optional P T Fill gap between 2913 1 Barbed ins
37. 00664MAN 04 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 two pump module will typically handle 5 to 6 ton systems model sizes 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
38. C to pump Check gauges for pressure drop Low or no Outdoor liquid Delta T across the Outdoor Loop Determine the cause of the flow flow ports should be between 5 7 restriction and correct it 3 4 C or compare pressure drop Verify pumps have power and to the tables for the unit working and sized correctly Entering liquid tempera Measure the entering liquid temper Increase the size of the ground ture too cold ature Most likely caused by under loop sized ground loop Dirty or fouled heat ex Disconnect the outdoor loop lines Have a qualified service technician changer evaporator and check the inside of the pipes backflush the system for scale deposits 000664MAN 04 Page 28 01 MAR 2012 Low Suction Pressure continued High Suction Pressure may appear to not be pumping TXV frosting up Random high pressure trip does not occur while on site Random manual high pressure trip does not occur while on site Random low pressure trip does not occur while on site 01 MAR 2012 OPERATION TROUBLESHOOTING SEL iiic Action Hot Tank temperature too TXV stuck almost closed or partially blocked by for eign object Low refrigerant charge Faulty compressor not pumping TXV adjusted too far open TXV stuck open TXV stuck almost closed or partially blocked by for eign object Intermittent Hot Indoor Loop circulator condenser to Hot Tank
39. Delta accepted by system Stage 2 System must be pressurized to minimum of 12PSIG for Stage3 Stage 3 to activate Hot Valve Temp TABLE 11 SET COOL STG1 TABLE 16 COOL DISPLAY Lene onte Units missae ra eon om Limited to Setpoint accepted by system Stage 1 Flag 0 Off 1 On ag 20 120 Limited to Delta accepted by system Cold Valve Temp 3 Way activation temperature 3 Way activation temperature 01 MAR 2012 Page 13 000664MAN 04 Theory of Operation SYSTEM DESCRIPTION The EMWT HSCW heat pump operation differs from tradi tional heat pump operation in that there is no dedicated heating or cooling mode Instead the heat pump operates solely in the heating mode there is no reversing valve required to obtain cooling Traditional heat pump setups use only one side of the refrigeration process at a time The other side of the process is in a sense wasted as it is connected directly to the ground loop In other words the heat pump can only transfer heat from the ground loop to a heating zone or vice versa when operating in cooling mode The EMWT HSOCW unit adds another dimension to the equation it takes advantage of both sides of the refrigeration process What this means is that it can not only transfer heat between the ground loop and a heating load or cooling load it can transfer heat directly from a cooling load to a heating load virtually doubling t
40. L1 L3 4 Verify that the green light on the side of the cabinet is on Testing 1 2 Turn the compressor breaker on The compressor will start Note that the outdoor pump module does not start It will not start until the cold tank reaches 40 F 4 58 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 3 Monitoring the refrigeration gauges while the unit runs Monitor the outdoor pump module contactor or LED 4 5 Record the following data 2 minutes after the outdoor pump module turns on Record the suction pressure when the outdoor pump module turns on Suction pressure Discharge pressure Outdoor Loop In Supply In temperature Outdoor Loop Out Supply Out temperature Outdoor Delta T should be between 5 8 3 49 Outdoor flow if available Compressor L1 C current black wire place meter between electrical box and compressor NOOR Let the unit run through a cycle Record the Heating Stage 1 setpoint default 108 F 42 C 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 heating zone or zones and let the
41. MG s factory in Petitcodiac New Brunswick of each defect mal Iffunction or other failure and a reasonable number of attempts by 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 NEGLIGENCE OR AS STRICT LIABILITY JOBTAINING 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
42. all 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 000664MAN 04 Page 24 01 MAR 2012 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 Remove the door and electrical box cover Verify that the LCD display is powered up If it is not proceed to POWER SUPPLY TROUBLE SHOOTING otherwise proceed to STEP 2 NOTE Either the Hot Tank temperature must be below the Stage 1 Activation value or the Cold Tank temperature must be above the Stage 2 activation value in order to start the compressor Adjust the values or open a zone to start the compressor if the tanks are satisfied STEP 2 Check the Service 1 display to see the lockout statu
43. ammable 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 20 the for approximate volume per 100 ft EMWT HSCW units are particular in that there is no isolation between the indoor and outdoor loops The entire system floor zones fan coils etc uses the ground loop fluid This must be accounted for when calculating the amount of antifreeze required Failure to do so will result in reduced freeze protection and could cause the heat exchanger to freeze and rupture voiding the warranty When the volume of the loop has been calculated and the appropriate amount of antifreeze is ready for addition by referencing TABLE 19 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 It will be necessary to refill the tank with a
44. ble 30 Heat Pump Electrical Information 380 3 50 0 1 2 2 2 Page 39 DIAGRAMS Diagram A B amp G NHF 36 Pump Curve cai Anciana Page 8 Diagram B Circulator and Major Component Locations Page 9 Diagram C Typical Pete s Plug amp Thermometer Stem Page 18 Diagram D Typical P lge RUNE SE EHE Page 18 Cas Page 42 DRAWINGS 000665CDG Typical Heating and Cooling Zone Wiring Diagram EMWT HSCW Series Page 10 000970PDG Single Unit Connection to DHW Pre Heat Tank Page 11 000530PDG Typical Zone Types for Hydronic Applications eese eese eee Page 17 000906CDG Geo Flo Circulator Pump Module Installation Brass FPT Page 20 000346RCD EMWT HSC Series Refrigeration Circuit Diagram Page 34 000355SCH EMWT HSC 1T Schematic Diagram 1 1 Page 40 000356SCH EMWT HSC 1T Schematic Diagram 2 22 2 Page 41 01 MAR
45. burned Or 24VAC across coil but contactor will not engage Faulty elements With power off to the unit measure Replace the faulty elements the resistance across the T1 and T3 terminals of the electric heat contac tor Under 6 ohms both elements good Infinity both elements bad Low Electric Heat One faulty element With power off to the unit measure Measure each element individual the resistance across the T1 and ly to determine the faulty one and terminals of the electric heat contac replace it tor to 120hms one element bad 000664 04 30 01 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 contactor 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 contactor Faulty cold zone circula tor 01 MAR 2012 No 24VAC signal present across T and of the heat pump terminal strip Other zones work 24VAC 15 present across T and C of the heat pump terminal strip but no hot water reach es the zone Verify that all valves
46. chedule 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 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 whic
47. 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 Exchanger Temperature Probe POOL SPA Pool 5 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 oen ER TENE Eq __ Chris Geddes 06 SEP 07 Petitcodiac NB Chris Geddes 06 SEP 07 SMS Pr see or Typical Zone Types for Hydronic Applications Chris Geddes 06 SEP 07 j i i TCE mraja Typical Zone Types for Hydronic Applications Size Drawing Number REV SHEET A 000530PDG 01 1 of 1 06 SEP 07 DATE 01 MAR 2012 Page 17 0
48. dule Liquid to water 01 02 etc Hydronic with two tanks Electric Backup Nominal Size 12K 12 kW 65 5 Indoor Loop Exchanger Copper Functions 3 Heating SC Simultaneous Cooling Outdoor Loop Exchanger W Domestic Hot Water C Copper Refrigerant lt R410a Compressor Stages S 1 Stage T 22 Stage Voltage Code 1 230 1 60 2 208 3 60 6 220 1 50 7 380 3 50 000664 04 2 01 2012 APPLICATION TABLE SIZE FUNCTION REFRIGERANT VOLTAGE STAGES OUTDOOR COIL INDOOR COIL REVISIONS C C 07 07 C C This manual applies only to the models and revisions listed in this table 01 MAR 2012 Page 3 000664MAN 04 Table of Contents TABLES DIAGRAMS amp DRAWINGS 2 2 2 PAGE 5 INSTALLATION INFORMATION nga PAGE 6 hljgeriegi m Page 6 Beriedneni E om Page 6 Optimum M S Page 6 Electrical PrOVISION Sonata
49. e 7 Table Lights Page 7 Table 4 Controller Inputs Outputs Page 12 Table 5 Hot Tank Setting Ranges rss EIUSDEM EE KE MOREAU Page 12 Table 6 Cold Tank Setting Ranges iii Page 12 Table 7 piu iria Page 13 68 Set Heat Stade le Mec 13 9 Ser Heat Stade 13 Table 10 Set Heat 3 2 2 13 1 lt qe Ere 13 Table 12 Set COOL Stage 2 13 13 SOVICO 2 _____ dad Page 13 Table 15 Feat DISDIOYS cocina 13 Table 16 Cool DISA Page 13 Table 17 Compressor Truth Table 2 2 14 Table 18 Heat Pump Size vs Heated Area for Ground Loop Systems Page 16 Table 19 Antifr
50. e fill hose to Cold Indoor Boiler Drain Connect the drain hose to the Cold Zone Boiler Drain Close the Cold Zone IN Ball Valve Close the top isolation valve of the Cold Indoor Circulator Open the Hot Zone Boiler Drain and drain hose valve Open the Hot Indoor Boiler Drain and fill hose valve Purge until air can no longer be heard leaving the drain Close the Cold Zone Ball Valve Open the top isolation valve of the Cold Indoor Circulator 10 Purge until air can no longer be heard leaving the drain 11 Close the top isolation valve of the Cold Indoor Circulator 12 Close the Cold Zone Ball Valve 13 Open the Cold Zone IN Ball Valve 14 Purge until air can no longer be heard leaving the drain OSTO U Each of the procedures above may need to be performed several times as purging of the entire system is performed to ensure that all of the air has been removed 01 MAR 2012 DOMESTIC HOT WATER 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 Ensure the tank is filled with water and under pres
51. each of the display screens 12 01 MAR 2012 TABLE 7 EMWT Display TABLE 12 SET COOL STG2 Units Hot Tank Temp Hot Tank Temperature Cool S2 Setpoint Setpoint entered by user Cold Tank Temp E EISE Setpoint accepted by system Three Way to Hot 0 1 Yes Cool S2 Delta Delta entered by user Lockout Flag 0 1 TABLE 13 SERVICE 1 Hi Pres Lockout Flag 0 clear 1 fault Heat S1 Setpoint Setpoint entered by user Lo Pres Lockout Ld 0 clear 1 fault Limited to Setpoint accepted by system Lock Count Number of lockouts Heat 51 Delta Delta entered by user Permanent Lock 0 not locked 1 locked Limited to F Delta accepted by system LE 14 SERVICE 2 TABLE 9 SET HEAT STG2 Parameter Parameter Cooling Only Minutes of timer max 60 Delta entered by user Passive Timer Delta accepted by system Compressor Lo Flag 0 1 0 Off 1 On Compressor Hi Heat S2 Setpoint Setpoint entered by user Passive Kill 0 passive cooling enabled Limited to Setpoint accepted by system 1 passive cooling disabled Heat S2 Delta Limited to TABLE 10 SET HEAT STG3 TABLE 15 HEAT DISPLAY Parameter Description Heat S3 Setpoint Setpoint entered by user Units Limited to Setpoint accepted by system Hot Tank Temp Hot tank temperature E Stage 1 Heat 53 Delta Delta entered by user 0 Off 1 On Limited to
52. ee 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 D 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 times 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 18 01 MAR 2012 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 WARNING RISK OF EXPLOSION ZA The Hot Tank is equipped with electric elements Ensure the electric heat breaker is off while flushing purging and adding antifreeze The power should not be turned on until these three steps have been completed and the system has been pressurized to
53. eeze Percentages by Volume Page 19 Table 20 Volume of Fluid per 100ft Of Pipe enne Page 19 Table 21 Refrigerant Charge Chart css Le t eor DUM Page 35 Table 22 Shipping INTOFMAtION Page 35 Table 23 Standard Capacity Ratings Ground Loop Heating 60Hz Page 35 Table 24 Standard Capacity Ratings Ground Water Heating 60Hz Page 35 Table 25 Standard Capacity Ratings Ground Loop Cooling 60HZ Page 36 Table 26 Standard Capacity Ratings Ground Water Cooling 60Hz Page 36 Table 27 Heat Pump Electrical Information 230 1 60 e eese eese eere eere nnne nnn Page 39 Table 28 Heat Pump Electrical Information 208 3 60 Page 39 Table 29 Heat Pump Electrical Information 220 1 50 e eese eese eere eene nennen nnn Page 39 Ta
54. 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 CIRCULATOR PUMP MODULE WIRING 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 Lonworks controller and LCD display All stage setpoints as well as other data can be obtained and adjusted using the display The heating stages are 51 Stage 1 compressor S2 Stage 2 compressor and 53 auxiliary heat The cooling stages 51 Stage 1 com pressor and 52 Stage 2 compressor The EMWT unit opera tion 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
55. ent 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 the
56. entified as a warranty statements made by Maritime Geothermal Ltd a corporation registered in New Brunswick Canada 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 IMG 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 Thermostats 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 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 d
57. es 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 23 Standard Capacity Ratings Ground Loop 60Hz STAGE 1 ELT 41 F 5 EWT 104 40 STAGE 2 ELT 32 F 0 Model indoor Pressure Drop Energy CAPAC Outdoor amp Indoor Pressure Drop Energy H _______ GAL USG L s PSI kPA Watts BTU Hr 37 600 3 27 Stage2 4 380 45 800 3 07 134 Stage 1 3 905 45 600 5 Stage 2 4 740 51 400 15 NaCl by Weight Ground Loop Fluid Table 24 Standard Capacity Ratings Ground Water Heating 60Hz EWT 104 F 40 ELT 50 F 10 Liquid Flow Outdoor Input LQuidgon amp Pressure Drop energy LUSG us PSI kPA Watts w Stage 2 4 545 58 800 17 2 4s ass 350 52201 193 Stage2 4 860 66 300 194 01 MAR 2012 Page 35 000664MAN 04 Tons L S We EXENEXCICIEREJI 3S 15 zm E ENENENCHOERNES 48 5 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 000664MAN
58. essor ZPS51K4E PFV Page 37 000664MAN 04 12 0 1 1 4 2 34 12 0 1 1 54 2 12 0 54 2 12 0 2 12 0 54 2 5 Oo al 01 MAR 2012 CAPACITY RATINGS continued Heating Data _Nominal 6 ton __ Power Consumption EMWT 75 HSCW P 1T R410a 60 Hz Watts Amps Watts W W m F BTU Hr 2 s 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 Om d o Om I 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 N N D Co N 5 202 2 99 D 5 021 5 270 318 O N I do 00 5 281 3 43 gt L 5 104 5 325 3 68 E 5 332 3 97 z O lt gt 4 22 45 140 547 7 3 59 755 7 2 63 3 126 41 17 508 5 174 5 395 68 0 Tl E 50 14 0 59 9 8 1 65 905 5 180 10 0 63 3 15 5 4 5 19 310 BTU Hr O Compressor ZPS60K4E PFV Watts 5 401 4 55 104 0 40 0 oF Igom 83 934 24 592 Om 04 O O O D ou 1 1 D
59. evice 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 5 Other accessories when purchased separately for 1 year from the date of shipment from MG 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 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 s
60. g Load 14 Cooling Load OR 14 Simultaneous Heating and Cooling Loads nennen nennen Page 15 SIZING AND HYDRONIC INFORMATION 16 Heat Pump sra sinus IU cu NK DICE I nre DNE NEP EE Page 16 Hydronic Applicatioris Gerieralz oues ii Page 16 GROUND LOOP SYSTEM INFORMATION eeseseereene nnne nenne nune nne nesse sese use nns PAGE 18 Circulator Pump Module cT 18 Flushing amp Purging the Ground Page 18 Adding Antifreeze 5 2 oe orn Sei ______ __ ____ Page 19 uiri Hm 19 PIDO rinitis 19 STARTUP PROCEDURES 21 Pre Start e 21 1g U1 22
61. h 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 2 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 labour 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 t
62. he coefficient of performance COP of the unit Another added benefit of this type of system is reduced load on the ground loop as it is not used when the tanks are within their allowable temperature range This provides in creased recovery time for the ground loop which leads to better entering liquid temperatures Both sides of the refrigeration process can be used be cause there is a buffer tank on each side of the refrigeration process The Hot Tank is on the condenser side and the Cold Tank is on the evaporator side When in operation heat is ex tracted from the Cold Tank and transferred to the Hot Tank The Hot Tank has an upper limit and the Cold Tank has a lower limit When the limit is exceeded ground loop fluid is directed to the tank via a pair of two way valves The outdoor pump mod ule is activated and the ground loop fluid circulates through the tank until the tank temperature is brought back into range at which point the outdoor loop pump module is shut off This pro cess will repeat as necessary until the tanks are satisfied and the compressor is shut down COMPRESSOR OPERATION The compressor operates based on the combination of the calls for heating and cooling They are OR ed together as shown in TABLE 17 Impossible combinations have been re moved from the table for simplicity OPERATION SCENARIOS There are three different operating scenarios for this unit heating load only cooling load only and simulta
63. he 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 m X 4 The costs of normal maintenance This Limited Express Residential Warranty applies to MG Residential Class products manufactured on or after February 15 2010 MG S LIABILITY UNDER THE TERMS OF 5 LIMITED WARRANTY SHALL APPLY ONLY TO THE MG UNITS REGISTERED WITH MG THAT BEARS THE MODEL AND SERIAL 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 be limited to the duration the Limited 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
64. 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 recovery 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 micron
65. ical 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 for the heat pump and plenum heater 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 Oo E C 01 MAR 2012 Page 21 000664MAN 04 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 Remove the caps from the service ports and connect a refrigeration manifold set to the unit 2 Turn the power on to the heat pump and set all controls including all zone thermostats to OFF 3 Measure the following voltages on the power block and record them on the startup sheet L1 L2 L2 L3
66. 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 An extended warranty option is also available Please contact Maritime Geothermal Ltd via the contact information in the previous paragraph for more information
67. ivation S1 Stage 1 Setpoint 8 2 80 85 2 70 70 20 2 70 40 TABLE 6 COLD TANK SETTING RANGES Default _ Allowable Range T MAX Stage 2 Setpoint 40 55 Stage 2 Delta 2 15 Stage 2 Activation Stage2Setpint 50 45 60 Semi ts Stage 2 Activation 47 75 Cold Loop Setpoint 44 39 S1 1 49 S1 1 1 Stage 1 Setpoint DISPLAY SCREENS The display has six buttons at the bottom of it They are from left to right EXIT LEFT UP DOWN RIGHT ENTER These buttons are used to select screens and to select and modify values Any parameters that have a W at the bottom left of their section of the display may be modified To adjust a setpoint select the setpoint and press ENTER Set the least significant digit furthest right and then press the LEFT button to select the next digit Press ENTER to store the value once it has been set Note that there is a range that the parameters can be set to If a value outside the range is en tered the actual value for the parameter will be that denoted by the Limited To value When the unit is powered up the display will show the Distech Controls default screen Press the ENTER button twice to see the list of available displays Displays is the only selection from the startup screen that is used The main display for this system is the EMWT Display screen Select it from the list and press ENTER to view it TABLES 7 16 describe
68. n 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 000664MAN 04 Page 22 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 Startup Record Sheet MWT HSCW Series Size 25 75 Two Stage R410a Province Check boxes unless Model asked to record da Country ta Circle data units HomeownerName 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 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 EN STARTUP DATA Loop static pressure Ground Loop All shut off valve are open full flow available System y Loop is full and purged of air Antifreeze type Antifreeze concentration Loop static pressure Domestic Hot Water shut off valves are open Lines are full and purged Desuperheater pump wire is disconnected
69. n 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 000664MAN 04 Alva 003 10 lt 0 saaaao 2 8300319 5 eseajey Lo suyo 80 12 5 2 5300319 52000 co uoneJeBujes seueg 9SH EN BEIC perciddy 2 a34 9 LINVAHY LINWAHY 61000 50 Jaquinn 993975000 IES 9715 pe ouddy 773 __ poa 1 9 gt Josseidwog lt lt A NI 4001 552 Jeuc INO 4001 MA bs pine S lt Josuopuo2 Q JojeJode 3 J i Be INO dina 4007 eJnsseJd gt NI 4001 nono _ Q 55 MO 99IAJOS x 100 NI O Jajesyladnsag 6 e Qp db D GOD GD GD GD GOD GD OD GOD OD GOD GD GOD GD GD OD GD GOD GD GOD GD GOD GD GD GD GD GD OD GD GD OD OD 4 dOO1 j BEN TEN Joopu e 25492 gt O 4 ios 1491094
70. neous heating and cooling loads Each of these scenarios is explained in the following sections HEATING LOAD ONLY As described previously this unit has three heating stages Stage 1 Stage 1 compressor part load Stage 2 Stage 2 compressor full load and Stage 3 heating tank electric ele ments In the heating load only scenario the Hot Tank will see a temperature drop due to the heating load When the Hot Tank reaches the heating Stage 1 activation temperature the com pressor will start part load mode and the Hot Indoor and Cold Indoor circulators will be turned on to circulate fluid between the heat exchangers and the tanks 000664MAN 04 Page TABLE 17 Compressor Truth Table Stage 2 Stage 1 Stage 2 Heating Cooling Stage 2 Stage 1 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 3 activation temperature is reached the electric elements will be brought on As the heating load becomes satisfied the Hot Tank will begin to rise in temperature Each heating stage will shut off at its setpoint value and the Hot Tank will be satisfied While the compressor is
71. ntifreeze several times to get all the antifreeze into the system Pump the system for 5 to 10 minutes longer to ensure the remaining fluid has been well mixed TABLE 20 Volume of fluid 100 ft of pipe Volume 100ft Igal USgal L Copper 15 5 Type of Pipe Diameter 1 1 4 24 2 1 1 2 34 8 Rubber Hose Polyethylene 3 4 IPS SDR11 1 IPS SDR11 1 1 4 IPS SDR11 6 7 1 1 2 IPS SDR11 ge 19 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
72. one Circulator B amp G NRF 36 with isolation valves e Pressure gauges e Shutoff valves and boiler valves for purging 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 NRF 36 Speed 1 O NRF 36 Speed 2 O NRF 36 Speed 3 mu 45 gpm 50 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 Stage 3 setpoint and delta T values see TABLE 2 The unit is shipped with the electric heat breaker in the off position IT IS VERY IMPORTANT THAT THE SYSTEM 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 un less the system pressure 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 000664MAN 04 Page 8 HEATING ZONE CONNECTIONS The Heating Zone ports are 1 FPT brass fittings refer to CASE DETAILS on page 35 The heating zone header pipes can be connected to these ports The Heating Zone Circulator is activated by connecting R
73. pumps will be activated immediately and ground loop flow will pass through the heating tank NOTE THE COOLING ONLY SWITCH MUST BE IN THE OFF POSITION TO ENABLE HEATING OUTPUT PARAMETER RANGES TABLE 5 and TABLE 6 depict the allowable setting rang es for the Hot and Cold tanks The bold values are user adjust able The remaining values are fixed or calculated by the con troller The Hot and Cold Loop parameters are what prevent the Hot Tank from becoming too hot and the Cold Tank from be coming too cold When there is a load on one tank and little to no load on the other the little to no load tank will reach the Loop Activation temperature When this occurs the tank valves will be adjusted to connect this tank to the Outdoor Loop and the outdoor pump module will turn on Ground loop fluid will circu late through the tank until the temperature is brought back to the Loop Setpoint value or until the compressor shuts off due to the other tank being satisfied 000664MAN 04 Page Cooling Only Switch Reset Button TABLE 5 HOT TANK SETTING RANGES Parameter Default Allowable Range F Hot Loop Activation 96 51 6 Hot Loop Setpoint 9 Stage 1 Setpoint 108 Stage 1 Delta 2121554 gt lt 114 81 6 111 8143 108 143 106 106 S1 2 15 104 100 S1 8 30 98 Stage 1 Activation 100 Stage 2 Setpoint Stage 2 Delta Stage 2 Activation 90 Stage 3 Setpoint Stage 3 Delta Stage 3 Act
74. r REV SHEET 000664MAN 04 Controls and Displays CONTROLLER INPUTS OUTPUTS The controller has several inputs and outputs that it uses to monitor and control the operation of the heat pump They are listed in TABLE 4 The status of the inputs and outputs can be seen via the various display screens of the LCD display They are described in the DISPLAY SCREENS section The controller outputs also have LED s to indicate their status TABLE 4 Controller Inputs Outputs Type Heating Tank Temperature Cooling Tank Temperature Low Pressure Control High Pressure Control Output Output Output Electric Heat Compressor LOW Compressor HIGH Output Outdoor Loop to Hot Tank Outdoor Loop Circulator Pumps Ground Loop is connected to the heating tank when active COOLING ONLY SWITCH The Cooling Only switch is located on the side of the elec trical box above the status lights It can be used to increase the efficiency of the unit during periods when no heating is required It effectively disables the heating capability of the unit by ignor ing the heating signals when the switch is in the ON position This allows the heating tank to float at the ground loop temper ature instead of being maintained at the heating setpoint tem perature This reduces the discharge pressure and improves efficiency accordingly Whenever there is a cooling call and the compressor is activated the outdoor circulator
75. running in either part load or full load mode the Cold Tank will be chilled as heat is extracted from it and transferred to the Hot Tank When the Cold Tank reaches the Cold Indoor Loop activation temperature the pair of two way valves will be switched to the Cold Tank and the out door loop pump module will be brought on to circulate ground loop fluid through the Cold Tank The outdoor loop pump mod ule will remain on until the Cold Tank has been brought back up to the Cold Indoor Loop setpoint value COOLING LOAD ONLY As described previously this unit has two cooling stages 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 Tank reaches the Stage 1activation temperature the compres sor will start part load mode the Hot Indoor and Cold Indoor circulators will be turned on to circulate fluid between the heat exchangers 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 14 01 MAR 2012 As the cooling load becomes satisfied the Cold Tank will begin to drop in temperature Each cooling stage will shut off at its setpoint value and the Cold Tank will be satisfied While the compre
76. s If there is a lockout record it Turn the power off wait 10 seconds and turn the power back on STEP 3 lockout occurs on the Service 1 display and the compressor does not attempt to start proceed to the PRESSURE CONTROL TROUBLESHOOTING section otherwise proceed to STEP 4 STEP 4 lockout does not 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 STEPS STEP 5 If the compressor starts and sounds normal this means the compressor is OK and the problem lies elsewhere Proceed to the OPERATION TROUBLESHOOTING section STEP 6 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 POWER SUPPLY TROUBLESHOOTING Fault Possible Cause Verification Recommended Action No power to the Disconnect switch open Verify disconnect switch is in the ON Determine why the disconnect heat pump if installed position switch was opened if all is OK close the switch Fuse blown At heat pump disconnect box breaker or replace fuse Breaker Tripped voltmeter shows 230VAC on the line with proper size and type Time side but not on the load side delay type D No LCD display Blown Primary or Second Visually inspect Remove fuse and Replace fuse ary f
77. s 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 refrigerant 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 ca
78. s to this Less probe lag leading to reduced overshoot as the tank temperature rate of change is reduced when only Stage 1 compressor is active e Prolonged Stage 1 compressor runtime leads to increased overall efficiency 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 cannot not exceed 108 42 C Stage 1 cooling setpoint cannot be set below 40 F 4 5 The control ler will limit the setpoints to these values if out of range values are entered These limit values prevent the refrigerant pres sures from approaching the safety control settings possibly causing nuisance shut downs The controller settings can only be entered in Fahrenheit Celsius values are for reference only TABLE 2 Typical Control Settings Activation is indirectly set by the Setpoint and Delta values If only floor zones are being heated it is highly recom mended to drop each of the heating setpoints by 15 F 8 C for increased efficiency SAFETY CONTROLS The heat pump has three 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 pre
79. ssor Adjust 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 Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Correct the wiring or replace the circulator Replace contactor Correct the wiring or replace the circulator Correct the wiring or replace the circulator 000664MAN 04 ELECTRIC ELEMENT TROUBLE SHOOTING Possible Cause _ Verification Recommended Action No Electric Heat or faulty electric Reset if tripped If not tripped verify Determine why breaker was heat breaker that there is 230VAC across L1 and tripped Replace breaker if faulty L3 of the electric heat contactor Insufficient system pres Verify system pressure Must Increase system pressure sure at least 12PSIG to engage the safe ty pressure switch Faulty controller Hot tank temperature is below the Replace controller Heating Stage 3 activation point but the Electric Heat LED is not on Faulty controller Electric Heat LED is on but 24 Replace controller is not present across pin 9 003 of the controller output connector and C of the terminal strip Faulty electric heat Voltage on line side with contactor Replace contactor contactor held closed but no voltage on one or both terminals on the load side Points pitted or
80. ssor running in either part load or full load mode the Hot Tank will be heated as heat is extracted from the Cold Tank and transferred to it When the Hot Tank reaches the Hot Indoor Loop activation temperature the pair of two way valves will be switched to the Hot Tank and the outdoor loop pump module will be brought on to circulate ground loop fluid through the Hot Tank The outdoor loop pump module will remain on until the Hot Tank has been brought back down to the Hot Indoor Loop setpoint value SIMULTANEOUS HEATING AND COOLING LOADS In this scenario the system will essentially be balanced with the exception that the Hot Tank will receive extra heat from the energy consumed by the compressor Assuming that both tanks are satisfied at the start of the scenario either tank could start the compressor part load mode as well as the Hot and Cold Indoor circulators Refer to the truth table of TABLE 17 If the loads are large enough the compressor will continue to run in part load mode until one of the tanks reaches its compressor full load activation point Stage 1 The compressor will contin ue to operate until both tanks have been satisfied The three way valve and outdoor loop pump module will operate as re quired should the tanks reach their temperature limit 01 MAR 2012 Page 15 000664MAN 04 Sizing and Hydronic Information HEAT PUMP SIZING TABLE 18 depicts a rough guideline as to the size of home each heat pump size
81. ssure becomes too low risking the danger of freezing conditions in the evaporator 01 MAR 2012 Page 7 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 C Manual High Pressure Control The manual high pressure safety control is wired in directly into the compressor contactor signal and will shut the compres sor down should there be a failure in the control system The controller continuously monitors the high and low pressure safety controls A and B Should one of them trip the compressor will shut down and a lockout counter will be incre mented After a 10 minute period a re start will be attempted If the unit runs for an hour without another trip the lockout coun ter will be reduced The system will allow up to three safety lockouts within an hour after which the lockout will become per manent and the compressor cannot be started again until the unit is powered down or the RESET button in the electrical box is pressed Before the unit check the SERVICE1 display screen to determine which safety control tripped If the controller 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 NOTE If the the heat pump is permanently locking out on the LOW pressure control repeated resetting of the
82. sure 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 certain that the domestic hot water circulator in the unit is flooded with water when it is started CAUTION the domestic hot water pump is water N lubricated damage will occur to the pump if it is run dry for even a short period of time 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 For the pre heat tank setup the final tank should be set to 140 F 60 C The pre heat tank does not require electric ele ments This setup takes full advantage of the desuperheater as itis the sole heat provider to the pre heat tank The desuper heater remains active during the compressor runtime until the pre heat tank has been completely heated by the desuperheater alone This setup is more energy efficient than a single tank setup 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 valves be closed DIAGRAM B Circulator and Major Component Locations DHW Circulator Three Way Valve Cold Indoor Circulator
83. tion 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 NORDICO 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 as the recommended breaker size 000664MAN 04 Page 6 A properly qualified
84. ulation and wall 1 FPT Suitable 1 MPT 3072 1 MPT with expanding foam Brass Fittings Adapter NOTES Circulator 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
85. 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 3 TABLE 3 Indicator Lights Colour Green Compressor ON Yellow Electric Elements ON Trouble Locked out LOOP 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 e Heating Zone Loop Connections for building heating zone loop The Heating Zone Circulator provides flow for this loop e Cooling Zone Loop Connections for building cooling zone loop The Cooling 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 000664MAN 04 INTERNAL HYDRONIC COMPONENTS The EMWT Series unit has virtually everything required for a hydronic installation built into it including the following e 50 USGAL 1891 Hot buffer tank with electric backup 50 USGAL 189L Cold buffer tank Pre charged expansion tank 75PSIG pressure relief valve Heating Zone Circulator B amp G NRF 36 with isolation valves e Cooling Z
86. uns 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 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 code be set at 120 140 F if required by local code Dole flow control Valve The Dole6 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 4 Multimeter Voltmeter 000664 04 32 01 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
87. use on transformer check for continuity if in doubt Faulty transformer 230VAC is present across H1 and Replace transformer H4 of the transformer but 24VAC is not present across X1 and X4 of the transformer Faulty LCD Display Remove the front cover of the dis Replace LCD display play 24VAC is present across 24V and COM of the pins but there is no display 01 MAR 2012 Page 25 000664MAN 04 PRESSURE CONTROL TROUBLESHOOTING Faut Possible Cause Verification Recommended Action _ Faulty High Pressure Con Verify if there is 5VDC across pin 5 High Pressure Control Low Pressure Control 000664MAN 04 trol open HP pressures must be at static levels and 6 of the controller input connect or bottom connector Replace high pressure control if 5VDC is present Faulty Controller Unit out of refrigerant Faulty Low pressure con trol open HP pressures must be at static levels Faulty Controller Verify if there is 5VDC across pin 5 and 4 of the controller input connect or bottom connector Check static refrigeration pressure of the unit for a very low value Verify if there is 5VDC across pin 5 and 4 of the controller input connect or bottom connector Verify if there is 5VDC across pin 5 and 4 of the controller input connect or bottom connector Page 26 Replace controller if no voltage is present and the Service 1 display High Lockout parameter shows 1

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