Home

DX Series Manual - Nordic Geothermal Heat Pump

1. SELECT Y 22222200 igh 6 T CRLOWYBG 2 32 Thermostat Wiring Max 12 5 100 5 DO Use an 18 7 conductor cable to connect this 5 g unit to the thermostat 24VAC Common Field G F 250 T stat 88 01 Y1 Stage 1 Heat Cool Compressor Wiring 5 RH 24VAC Hot 24VAC 5 7 L Trouble if available on thermostat x Tm W2 Stage 2 Heat Plenum Heater S2 0 DO Plenum O B W1 Reversing Valve Active in Cooling 28 Heat Y2 Not Applicable Relay 4 a Airflow Reduction Wiring e Use an 18 2 conductor cable to connect Electrical Box AR1 AR2 to dry contacts Fan speed can be reduced 15 for zone applications Plenum Heater Wiring Use an 18 2 conductor cable to connect Electrical 1 to Plenum Heater C 1 1 6 High 6 Med Nom 12 208 240 24 100VA Transformer 4 gt 0 Field y Start Wiring C
2. 4 O 3 923 9 16 1 12 943 3 427 J O NI 0 Compressor ZPS40K4E PFV 001583MAN 02 Page 40 00 N O 4 CO N 00 00 O O 2 601 11 0 65 17 4 EER COPc 20 1 PSIG kPa 237 1 631 255 1 761 270 1 899 296 2 044 319 2 196 342 2 397 366 2 026 392 2 705 29 4 90 32 2 95 35 0 100 37 8 105 40 6 110 43 3 115 46 1 BTU Hr Watts 62 721 18 377 61 937 18 147 61 638 18 060 61 302 17 961 98 448 17 125 58 080 17 017 57 684 16 901 96 816 16 647 37 3Pa 0 15inH20 Ext Static 01 JUN 2012 CAPACITY RATINGS continued DX 65 HACW P 15S U D 9 3 14 O 2 9 gt 1 O N oF ses 10 12 2 15 9 4 20 6 7 25 3 9 EN Power Consumption BTU Hr Amps Watts Watts W W PSIG 27 054 3 384 14 7 455 3 839 3 06 301 29 807 13 484 15 1 5 3 939 3 2 5 8 2073 310 2134 Pares 2 35 969 3 683 15 9 5 4 138 3 55 328 10539 2259 3 CO CO 2324 oF 96 35 6 98 36 7 100 37 8 102 38 9 104 40 0 Heating Mode Nominal 5 ton in CFM L sec R410a 60 Hz oF se oF im BTU Hr Watts 70 0 21
3. Page 42 DIAGRAMS AE Page 47 DRAWINGS 000970PDG Single Unit Connection to DHW Pre Heat Tank Brass FPT Page 8 000310CDG NCB Laptop Communication Cable Page 11 000606CDG Typical Duct and Condensate Connections Vertical Case Page 14 001638PDG DX Line Set Interconnect Tubing Installation Modular Design R410a Page 17 001576RCD DX Series Refrigeration Circuit Diagram Heating Mode Page 35 001577RCD DX Series Refrigeration Circuit Diagram Cooling Mode Page 36 001563SCH DX H P 1S DE Schematic Diagram Page 43 001564ELB DX H P 1S DE Electrical Box Diagram eese eee eren nnne enne Page 44 001561SCH DX HAC P 1S DE Schematic Diagram eren nennen Page 45 001562ELB DX HAC P 1S DE Electrical Box Diagram ese eee eee eene ee een Page 46 01 JUN 2012 Page 5 001583MAN 02 Installation Information UNIT DESCRIPTION The DX Series unit is a high efficiency single stage direct expansion DX heat pump with R410a refrigerant It extracts and rejects heat from the ear
4. Page 16 Silver Solderind LING Page 16 No o o Page 16 11 16 11 111 116 ihe Syste sentia reia Page 16 Charging the 223 2 16 cn L0 00S n9 ee Nanke Page 18 Prestar INSPEC Y Page 18 US ooo A Page 19 PPC o A ee ee eee ee Page 20 HEATING TXV ADJUSIMENT cece 21 16 Re Page 21 Heating Adjustment Record 2 2222 22 GENERAL MAINTENANCE 2 2 a Ida 23 TROUBLESHOOTING GUIDE PAGE 24 Page 34 Diagrams ii it Page 35 MODEL SPECIFIC INFORMATION omaia 37 Standard Capacity aries CAE Page 37 Capac hy vasta te sos Page 38 Electrical comence Page 42 Electrical Diagrams HW 230
5. GEOTHERMAL MEA Installation and Service Manual NORDIC DX Series Single Stage R410a Model Sizes 25 65 Direct Expansion Heat Pumps Maritime Geothermal Ltd P O Box 2555 Petitcodiac N B E4Z 6H4 Ph 506 756 8135 Email info nordicghp com Web www nordicghp com Document Number 001583MAN 02 REVISION DATE 01 JUN 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 DX 65 HACW P 1S L SDETV xx Series Revision DX Direct Expansion 01 02 etc Nominal Size Case Style 25 2 T
6. lt 000 CV TXV5 m gt TXV4 DISTR NO 1 CV TXy2 COOLING TXV1 TXV F D CV SG RECEIVER og R 4 WAY gt LOW PRES Uu it VALVE H RV 1 Pu gt DHW IN SERVICE PORI TXV BULB 1 SERVICE TXV BULB PORT HIGH PRES COOLING SWITCH DHW LOOP dd TXV BULB 2 gt DESUPERHEATER PRESS SW A ACTIVATION TABLE T UB ITEM ENERGIZED RV 1 YES 5 TXV BULB 4 COMPRESSOR ACCUMULATOR TXV BULB 5 11 11 0 D RHEAULT Petitcodiac NB NAS GEOTHERMAL m Approved By ENG Drawing Name DX Modular TXV Refrigeration D RHEAULT 000195 D RHEAULT D RHEAULT 1 Jun 2012 E O TN Circuit Cooling Mode 01 Initial Release D RHEAULT D RHEAULT 2 Nov 2011 Size Drawing Number REV SHEET ECO 4 IMPL BY APVD BY DATE A 001577RCD 02 1 of 1 001583MAN 02 Page 36 01 JUN 2012 Model Specific Information This section provides general information particular to each model For complete specifications please see the specifica tions document for the desired model REFRIGERANT CHARGE CHART SHIPPING INFORMATION Table 19 Shipping Information 8 0 3 6 12 0 7 3 16 0 9 1 20 0 9 1 System contains POE oil STADARD CAPACITY RATINGS The tables below depict the results of standard capacity
7. e H 0 9 4 1 367 h O 16 0 4 68 14 7 1 463 O O O oj O 1 565 O 13 4 O O 1 673 L 00 i N 1 787 Y mb al O f lt 22 00158 02 01 JUN 2012 CAPACITY RATINGS continued DX 45 HACW P 1S Heating Mode Nominal 3 ton R410a 60 Hz Power Consumption BTU Hr Amps ww PSIG F F BTU Hr lt Watts kPa C lt Watts 10 17 610 1 93 05 97 70 0 1 400 86 7 16 7 24 840 122 5 160 2104 36 1 21 1 661 30 4 7 278 15 19 204 1 996 8 7 314 99 70 0 1 400 87 9 17 9 26 630 94 5627 2165 37 2 211 661 311 10 0 7 803 20 9 1 102 70 0 1 400 89 2 19 2 28 502 6 7 6092 2259 38 9 21 1 661 318 10 7 8 351 25 9 5 105 70 0 1 400 90 5 205 30 479 39 6585 2357 406 21 1 661 325 11 4 8 930 30 25 716 2 220 9 8 392 107 70 0 1 400 92 8 22 8 33 907 1 1 1 535 2424 41 7 2111 661 33 8 12 7 9 935 3 27 900 361 109 70 0 1 400 94 4 244 36 297 1 743 7 8 175 2492 42 8 21 1 661 34 7 13 6 10 635 gt D
8. 1 Compressor Wiring 5 i Contactor Coil High Pres Manual Reset R410a 650psig R22 410psig G B _ R407c 450psig Y4 7 gt Reversing Valve coil Room RH a b Wiring E 2 9 Liquid line NO solenoid coil Olm W2 gt 1 Soaker Hose 5 1Solenoid Coil 3 2 NOTE O 2 06 ee may be 3 4 or 210 8 5 solenoid valves for Plenum gt lt Ee gt 2 cooling changeover Heater pd p 2 depending on the Wiring 1 999 0 model PLENUM HEATER OPERATION amp 1 provides a set of dry O contacts for operating plenum heater e 7 8 Low Pres Plenum Heat Fan will run automatically with Relay Thermostat W2 signal AIRFLOW REDUCTION Connect AR1 4 AR together with dry contacts to reduce the airflow for zone applications 170 Plantation Rd Chis ex dd p SEP 11 ris Geddes Petitcodiac NB Checked B Date MARITIME GEOTHERMAL 47 6H4 Chris Geddes 27 SEP 11 Drawing Name Approved By ENG Date Chris Geddes 27 SEP 11 255 _p _ _ _ DX HAC P 1S DE Schematic Diagram ECO 4 IMPL BY BY a 001561SCH 01 1 of 1 01 JUN 2012 Page 45 001583MAN 02 ELECTRICAL DIAGRAMS HACW 230 1 60 continued DX Series Electrical Box Diagram 208 230 1 60 Single Stage Scroll ECM Fan 2 Low Voltage Wiring 24VAC
9. N iN O al 00 M gt 68 99 N ol l0 u o EM B h O O O L o O 1 e 4 po ajaja Co N O L O L TI c N 01 JUN 2012 Page 39 001583MAN 02 CAPACITY RATINGS continued 55 1 5 U D 9 9 2 1 2 O 1 9 9 O N 108 743 119 819 131 900 C 10 12 2 15 9 4 20 6 7 25 3 9 30 1 1 35 1 7 40 4 4 45 7 2 Power Consumption _ 5707 813 124 335 3 148 3 02 _ 6357 7059 26 667 2 957 13 0 335 3 292 3 37 _ 7813 _ 9073 J 99 37 377 3 223 141 335 3 558 4 08 109898 mes 1 Compressor ZPS40K4E PFV e84 86 257 11 89 257 rest 89 257 reso 94 257 reso 94 257 L sec 1 700 80 16 1 70 80 1 70 80 1 70 80 1 70 80 1 70 80 1 70 80 1 700 802 O TI D 0 amp CO PSIG
10. O ad P P i E O 00 E O1 00 00 00 O O 00 O gt e O N 00 O 00 00 mb a 2 372 377 112 70 0 1 400 96 1 26 1 38 733 2597 444 211 661 35 6 14 5 11 349 392 115 70 0 1 400 97 8 27 8 41 289 2705 46 1 21 1 661 365 15 4 12 098 37 3Pa 0 15inH20 Ext Static DX 45 HACW P 1S Cooling Mode 410 60 Hz 6 00 gt N D N Power Consumption E Watts EER BTU Hr Watts Watts COPc kPa Watts 15 075 31 525 46 600 1 650 25 3 237 52 879 4 417 9 237 13 654 7 42 1 631 15 493 30 748 45 451 1 771 23 2 255 52 143 6 79 1 761 29 4 15 278 29 958 1 895 21 2 275 90 51 401 1 899 32 2 15 060 29 414 43 480 2 026 196 296 95 51 042 5 75 2 044 35 0 14 955 29 006 41 586 2 118 18 0 319 100 49 465 3 686 8 499 2 196 37 8 114 493 12 211 28 155 40 366 2 259 16 5 342 105 48 723 2 357 40 6 14 276 2 469 377 112 48 042 5 9 2 3 454 2 597 44 4 14 076 1 400 6 2 2 565 13 9 392 115 47 599 661 3 386 7 806 11 192 2 705 46 1 13 947 Compressor ZPS30K4E PFV 37 3Pa 0 15inH20 Ext Static 1 400 61 9 97 257 66 9 9 267 66 9 97 267 66 24 I O O
11. ______ _ indios Page 6 cani A a Page 6 Thermostat Requirements f Page 6 Fan Page 6 Control 7 Sale 0101 16 ee eee Page 7 Domestic Hot Water Connections Page 7 DIRECT EXPANSION UNIT OPERATION nnmnnn PAGE 9 ise Page 9 rene arcsec ears ode 9 SIZING AND DG 12 Heat PUMP SIZING uan 12 DUE Systems General esoo Page 12 Duet Systems Grill LayQU Page 12 13 Plenum A EREEREER 13 Condensate Drain aues _____ RE EFE IE Page 13 Duct SIZING E a 15 DIRECT EXPANSION LOOP CONNECTION AND CHARGING 0 0 12222 PAGE 16 Line Set Int rconnect sisters seal Page 16 x A riu na
12. 001564ELB 01 of 1 001583MAN 02 Page 44 01 JUN 2012 ELECTRICAL DIAGRAMS HACW 230 1 60 El L2 DX Series Schematic Diagram 208 230 208 230 1 60 Scroll ECM Fan N 115VAC 115 3 T3 L2 2 04 DHW Compressor L1 T1 A Circulator Pump 5 er 5 2 C OFF Hot Water dili ompressor Limit 1 1 Contactor UF Potential Relay Start Cap Air Flow Select White Low 6 Connect the brown wire with the Med Nom Default High 6 insulated terminal to the bottom left Max 12 terminal of the compressor contactor L1 marked A once lines are filled 5 and purged The DHW ON OFF en 2 SWITCH be used to enable High gt disable the pump O NOTE For 208VAC move the red wire connected to the 240 terminal of the transformer to the 208 terminal Required 2 gt NOTE In case of short or overload rectify Connections 100 Control 2 the problem and press the black button on Transformer 4 to reset breaker
13. is expressly understood that unless a statement is specifically identified as a warranty statements made by Maritime Geothermal Ltd registered in New Brunswick Canada MG its representatives relating to MG s products whether oral written or contained in any sales literature catalogue or agreement are not express Iwarranties and do not form a part of the basis of the bargain but are merely MG s opinion or commendation of MG s products EXCEPT AS SPECIFICALLY SET FORTH HEREIN THERE IS NO EXPRESS WARRANTY AS TO ANY OF MG S PRODUCTS MG MAKES NO WARRANTY AGAINST LATENT DEFECTS MG MAKES NO WARRANTY OF MERCHANTABILITY OF THE GOODS OR OF THE FITNESS OF THE GOODS FOR ANY PARTICULAR PURPOSE LIMITED EXPRESS RESIDENTIAL WARRANTY PARTS MG warrants its Residential Class products purchased and retained in the United States of America and Canada to be free from defects in material and workmanship under normal use and maintenance as follows 1 Air conditioning heating and or heat pump units built or sold by MG MG Units for five 5 years from the Warranty Inception Date as defined below 2 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 Sealed refrigerant circuit components of MG Units which components only include the compressor refrigerant to air water heat exch
14. 115VAC L3 T3 C e S 115 DHW Comressor L1 T1 Circulator Pump Compressor 1 Contactor en otentia Relay Start Cap pA ae White Black Stripe 4 NOTE only Med Nom Default To temporarily disconnect the DHW circulator High 6 pump remove the brown wire with the Max 12 insulated terminal marked A from the bottom Low MOTTO right terminal of the compressor relay T1 O Med N L High lt Required Connections um NOTE For 208VAC move the red wire connected to the 240 terminal of the 75VA Control transformer to the 208 terminal Transformer NOTE In case of short or overload rectify 240VAC _ 208VAC mm mm Airflow AR1 the problem and press the black button on Reduction IE j A transformer to reset breaker Wiring AR2 VY White Black Stripe 24VAC ow Pres High Pres C R410a 25psig R410a 565psig Room Control Thermostat Board Wiring L STATUS BE III Compressor W2 2 Low F R Contactor Coil 3 STATUS gt lt e b Plenum Heat Y 4 Plenum Heater Wiring 1 PLENUM HEATER OPERATION 8 1 provides a set of dry contacts for operating plenum heater Fan will run automatically with Thermostat W2 signal White Black Stripe AIRFLOW REDUCTION Connect AR1 amp AR2 together with dry contacts to reduce
15. 18 0 5 27 16 7 4 89 15 5 179 12 341 18 520 50 6078 12 199 18217 172 18024 42307 2 100 0 17 678 3 903 2 100 4 155 Compressor ZPS51K4E PFV Page 41 16 mb L 21 2 O on N P mb N I a 4 al 4 al 00 N TI 01 JUN 2012 001583MAN 02 ELECTRICAL TABLES Table 16 Heat Pump Electrical Information 230 1 60 Compressor Max Fuse Wire itm a a ae EJ E 24 3 117 35 4 50 29 3 43 1 60 Hand models may be connected with 2 conductor cable Table 17 Heat Pump Electrical Information 208 3 60 como ta Amps Amps 39 79 Table 18 Heat Pump Electrical Information 220 1 50 Max Fuse 67 17 7 98 22 5 153 Table 19 Heat Pump Electrical Information 380 3 50 Size ETE 38 6 1 6 8 43 8 6 52 001583MAN 02 Page 42 01 JUN 2012 ELECTRICAL DIAGRAMS HW 230 7 60 DX Series Schematic Diagram 208 230 1 60 Scroll ECM Fan 1 12 208 230VAC N 115VAC
16. When the loop is sufficiently hot enough to reach the Loop Switch set point 290psig the unit will switch to Loop 2 This starts the cycle over with a new loop and allows the previous loop time to recov er Heat pump operation will continue switching through the loops as required The time between loop changes is monitored and should it fall below the adjustable threshold default 15 minutes indicat ing that the loops are sufficiently hot the heat pump will begin using two loops at a time and continue cycling If the loop switch time falls below the threshold on two loop mode the soaker hose will be turned on if installed The soaker hose cools the loops down with water The loop sequences are shown in TABLE 3 TABLE 3 Cooling Mode Loop Sequences 01 JUN 2012 Page 9 As the transition from summer to fall begins and the cool ing load is greatly reduced the loops begin to cool down on their own Eventually a point is reached at which the loops are cooled down enough that two loops becomes too large a con denser This may occur naturally or there may be a few heating days and then a warm spell again the loops settings are not affected by a switch to heating mode Two loop operation can no longer be sustained and the unit will trip the low pressure safety control This occurrence will set the heat pump back to one loop mode and allow the unit to run properly when it auto matically restarts after the lockout timer expir
17. and size of the plenum heater if installed 4 Verify that the control connections to the thermostat and plenum heater if installed are properly connected and all control signals are off so that the unit will not start up when the power is turned on 5 Ensure all access panels except the lower one that provides access to the electrical box are in place Unit Charge 1 Ensure the unit has been vacuumed and has refrigerant in it If the unit is not fully charged the remainder can be added during the start up procedure Record the current amount of refrigerant in the system 001583MAN 02 Page 18 01 JUN 2012 UNIT STARTUP The unit is now ready to be started The steps below outline the procedure for starting the unit and verifying proper operation of the unit It is recommended that safety glasses be worn during the following procedures Preparation ENSURE UNIT IS CHARGED WITH REFRIGERANT BEFORE TURNING THE POWER ON STARTING A COMPRESSOR UNDER VACUUM WILL DESTROY IT IN A MATTER OF SECONDS VOIDING THE WARRANTY IF THE UNITIS NOT FULLY CHARGED THE REMAINDER CAN BE ADDED DURING HEATING MODE STEP 2 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 the thermostat to OFF Set up the thermostat as per the instructions provided with it so that it will function properly with the heat pump system set for heat pump not for heating and cooling T
18. 1 and Liquid 2 Loop field too small Leaking reversing valve Affected TXV s do not seem to oper ate properly Switch to cooling mode and verify all liquid line tem peratures for each individual loop switch The liquid line for the loop in use should be warmer than the oth ers If loops are interchanged the wrong liquid line will be warmer Charge is good superheats are good vapor line temperatures are low Reversing valve is the same temper ature on both ends of body com mon suction line is warm compres sor is running hot Pump the unit down and swap the interchanged lines Increase loop size Replace reversing valve Heating TXV s adjusted too far open Verify superheat It should be be tween 8 14 F 3 8 Superheat will be lowh if TXV s are open too far Adjust TXV to obtain 8 14 F 3 8 C superheat One or more heating TXV s stuck too far open Adjusting the TXV does not affect the superheat of the loop or the suc tion pressure Low super heat low discharge pressure Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Faulty cooling check valve leaking See Low Suction Pressure in this section TXV stuck almost closed or partially blocked by for eign object Intermittent fan Faulty compressor contac tor Also low discharge pressure Switch to cooling mode Unit operates cor rectly when loop
19. 100 covocomncrzicadararnn adicta clica ns Page 43 Electrical Diagrams HACW 230 1260 Page 43 Case Details A o e A Page 47 APPENDIX A ECM Fan Airflow Tables caca PAGE 49 WARRANTY INFORMATION E SUD 52 001583 02 4 01 JUN 2012 Tables Diagrams and Drawings TABLES Table 1 Control Signal Description poen deu Era dece Puta SEES Uere iR Page 5 Table 2 abES d lep1 2ee M Page 6 Table 3 Cooling Mode Loop Sequences Page 9 Table 4 Cooling Loop Configuration Page 9 Table 5 55232 Port Configuration SUAE SUA Page 10 Table 6 Control Board Commands gt Page 10 Table 7 Control Board Default Settings 10 Table 8 Heat
20. Insert the tips of the voltmeter probes into the back of the connect or at the fan to measure the voltage across the red and black wires ue should be 230 Page 31 If proper signal isn t present re place Fan Control Signal Har ness If proper signal is present replace fan motor head Replace Power Harness if 230VAC is not present replace motor if 230VAC 15 present 001583MAN 02 PLENUM HEATER TROUBLE SHOOTING Faut Possible Cause Verification Recommended Action _ No 230VAC Disconnect switch open Verify disconnect switch is in the ON Determine why the disconnect across plenum if installed position switch was opened if all is OK heater L1 and L2 close the switch Fuse blown At plenum heater disconnect box if Reset breaker or replace fuse at Breaker Tripped installed voltmeter shows voltage plenum heater disconnect box on the line side but not on the load Replace fuse with proper size side Check if breaker 15 tripped and type Time delay type D Same Line to L1 and L2 L1 to ground and L2 to Correct wiring ground both yield 115VAC but L1 to L2 yields OVAC W2 signal at call for auxiliary or Verify that the thermostat is indicat Set thermostat to engage auxilia Heat pump termi emergency heat from ther that auxiliary or emergency heat or emergency heat note some nal strip mostat should be on thermostats
21. LOOP LIQ O 31 1 4 LINES 3 8 1 2 CIRC PUMP DOOR ACCESS 24 8 mz COMPRES SOR 41 E ale ALT CIRC PUMP WIRE 2 ALT ELECTRICAL SERVICE Left Side View 3 Right Side View 55 65 01 JUN 2012 Page 47 001583MAN 02 CASE DETAILS continued Top View Size 55 80 001583MAN 02 Page 48 01 JUN 2012 APPENDIX A ECM Fan Airflow Tables FAN ONLY AGE Recirculation WT CTE 448 672 840 nimium 481 571 270 714 337 1142 539 L s 317 602 396 762 1064 502 63 963 6 AIRFLOW SETTING LOW FAN ONLY AGE Recirculation 671 317 401 507 FAN ONLY s 336 605 286 712 0 1352 638 890 420 757 357 808 1128 532 452 1021 1425 672 572 12 AIRFLOW SETTING MAX FAN ONLY AGE Recirculation Reduced e LLL TT igi 80 1680 1428 21 Ex 1 1809 11 5 2588 1269 2285 1078 1505 NOTES Unit sizes 25 45 and 55 nominal value up to 0 50 inH20 sizes 65 and 80 up to 0 70inH20 To obtain the REDUCED airflow values use a dry contact to connect AR1 to AR2 on the terminal strip INFORMATION TAKEN FROM DOCUMENT 000527INF 04 01 JUN 2012 Page 49 001583MAN 02 THIS PAGE INTENTIONALLY LEFT BLANK 001583MAN 02 Page 50 01 JUN 2012 THIS PAGE INTENTIONALLY LEFT BLANK 01 JUN 2012 Page 51 001583MAN 02 LIMITED EXPRESS WARRANTY of
22. complete 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 Ensure adjoining pipe insulation pieces are glued or tapes together to prevent gaps e Tubing should be securely fastened to prevent accidental bending AA CEDTHERMAL IS EA un 12 MARITIME Approved By ENG Drawing Line Set Interconnect Tubing AAA Geddes A Size Drawing Number REV SHEET 001638PDG 01 JUN 2012 Page 17 001583MAN 02 ECO IMPL BY APVD BY Startup Procedure The following steps describe how to perform the startup procedure of the geothermal heat pump The DX Series Two Stage R410a Startup Record located in this manual is used in conjunction with this startup procedure to pro vide 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 Ductwork 1 Verify that all ductwork has been completed and is firmly attached to the unit Verify that any dampers or diverters are properly set for operation of the heat pump Verify that all registers are open an
23. loop changes Switch to heating mode to confirm Frequent loop changes in two loop mode after some season runtime Page 29 Remove refrigerant 1 2 pound at a time in heating mode Install soaker hose Loop field too small Frequent loop changes in two loop Increase loop size mode after some season runtime 001583MAN 02 OPERATION TROUBLESHOOTING COOLING MODE Possible Cause Verification Recommended Action High Suction Cooling TXV adjusted too Verify superheat It should be be Pressure may appear to far open tween 8 12 F 3 6 C Superheat will be low if TXV 15 open too far Adjust to obtain 8 12 F 3 6 C superheat not be pumping Cooling TXV stuck open Adjusting the TXV does not affect the superheat or the suction pres sure Low super heat and dis charge pressure Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Leaking reversing valve Reversing valve is the same tem perature on both ends of body common suction line is warm com pressor is running hot Replace reversing valve Leaking reclaim valve Low Suction Air Flow Pressure Scavenger line remains hot where it enters the common suction line See Fan Troubleshooting section Note low airflow will cause the air coil to ice up once the suction drops below 90PSIG Replace reclaim valve Correct the problem Cooling TX
24. rating tests according to 870 2005 Table 14 Standard Capacity Ratings Heating 60Hz EAT 70 F 21 1 C VAPOUR LINE 32 F 0 C Input ie Capacity Watts BTU Hr 52 360 91 399 156 Table 15 Standard Capacity Ratings Cooling 60Hz EAT 80 26 7 LIQUID 77 25 C Input Energy Capacity BTU W Hr 24900 7 3 43 200 12 6 15 1 01 JUN 2012 Page 37 001583MAN 02 CAPACITY RATINGS DX 25 HACW P 15 R410a 60 Hz Heating Mode Nominal 2 ton Power Consumption PSIG 80 91 1927 32 8 93 1985 33 9 296 95 70 0 oF se 83 6 28 7 84 6 29 2 85 7 oF 13 6 T C was 10 8 983 1 184 E 94 2896 20 CFM L sec 1 000 21 1 472 70 0 1 000 211 472 70 0 1 000 W W BTU Hr Watts 13 383 3 921 14 413 4 223 15 511 Amps D 5 3 O al O i A O N O 5 5 O N 00 00 14 6 a L 5 7 15 7 O1 O O O al 25 3 9 30 9 9 6 0 O O al 2044 305 2104 314 35 0 97 36 1 99 21 1 472 29 9 00 N 4 545 70 0 21 1 70 0 1 000 472 1 000 86 9 30 5 88 2 16 9 iN 18 2 16 681 4 888 17 927 O N 1 1 108 3 743 1 119 4 819 4 131 4 900 7 Compressor ZPS20K4E PFV 2165 37 2 101 38 3 103 39
25. the home A heating system cannot be expected to produce an even warmth throughout the household when it is located at one end of the structure and the warm air is transmitted with uninsulated metal ductwork 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 thick styrofoam The styrofoam will smooth out any irregularities in the cement floor and deaden any compressor noise emitted from the bottom of the cabinet NORDICO heat pumps have an air filter rack which can be installed with the removable end where the filter is inserted on either side to facilitate changing the filter ELECTRICAL CONNECTIONS The heat pump has a concentric 1 093 0 875 knockout for power supply connection to the electrical box as well as one for connection to the circulator pump module for ground loop applications There are two 1 2 openings with plastic grom mets grommet hole is 3 8 in the upper section of the electrical 001583MAN 02 Page 6 box one for the thermostat connections and one for the option al plenum heater connections A schematic diagram and electrical box layout diagram ELB can be found inside the electrical box cover of the unit
26. too large for the unit Comp off if high lockout COOL Comp off time between heat amp cool When the thermostat calls for cooling the compressor will Comp delay since being off start Stage 1 as will the fan after a short delay adjustable The unit will run until the thermostat is satisfied and the unit Min loop time before mode increase shuts off the fan will continue to run for an adjustable period Loop pressure testing wait time During operation the control board will cycle through the loops Soaker start after comp on time as required Soaker hose run time maintenance The control board has an RS 232 communications port on Soaker hose ell time emergency board A simple program such as Hyper Terminal and an adapt System check interval er cable can be used to communicate with the control board Low pres lockout counter reduce time Drawing 000301CDG shows how to build the communications cable The port settings are shown TABLE 5 The High pres lockout counter reduce time mands available are listed in TABLE 6 Note that the COP must Low pres lock ignore counter be unlocked by command U before using command C to change High pres lock ignore counter system settings The list of settings for command C is shown in TABLE 7 It is recommended that the settings be left at the nese modes Land 100p memory ume 2 weeks Maximum mode to be allowed 20 Ignore low pres for 5min TABLE 5 RS232 Port Co
27. will introduce moisture into the system making the vacuum process take much longer than if the leak had been found and repaired first VACUUMING THE SYSTEM Remove the pressure from the system and connect the vacuum pump to the refrigeration manifold Tighten all hose connections open the valves on the manifold and start the vacuum pump Vacuum the system until the reading on an electronic vacuum gauge remains below 500 microns for a period of 5 minutes after the vacuum pump is shut off and the system sealed CHARGING THE SYSTEM Once the system has been vacuumed refrigerant can be added by weighing in 1 3 of the prescribed refrigerant charge into the low side of the system Start the heat pump in the heating mode and continue to add refrigerant as a liquid at a rate of no more than 1 Ib per minute until the prescribed charge is reached Alternately before the machine is started the entire charge can be weighed into the system through the high side of the system TABLE 12 shows the typical charge per unit size This allows for e 2Oftof distance 408 of pipe interconnect tubing from the unit to the wall e 20ft of distance from the wall to the borehole trench e astandard loop 100ft borehole or 1508 trench Additional refrigerant is required as per TABLE 12 if the installation exceeds these parameters TABLE 12 DX Charge Chart ess 5 4 7 3 9 1 Extra loop borehole 05 Ext
28. 1 70 0 2 100 991 2 100 88 0 31 1 89 4 18 0 10 0 19 4 40 155 11 765 43 251 21 1 70 0 21 1 70 0 991 2 100 991 2 100 31 9 90 9 32 7 92 5 10 8 20 9 11 6 22 5 12 672 46 560 13 642 50 092 21 1 70 0 21 1 991 2 100 991 33 6 95 3 35 2 125 25 3 14 1 14 677 54 151 15 866 1 Compressor ZPS51K4E PFV D N 106 41 1 108 42 2 110 43 3 70 0 21 1 70 0 21 1 70 0 21 1 2 100 991 2 100 991 97 2 36 2 99 2 37 4 27 2 15 1 29 2 16 2 58 198 17 052 62 498 18 312 2 100 101 4 31 4 67 060 991 38 5 17 4 19 649 49 7 0 20inH20 Ext Static 108 35 743 1 7 119 40 819 4 4 5 2 45 45 45 30 45 45 45 DX 65 HACW P 1S Cooling Mode Power Consumption EER COPc 19 4 PSIG kPa 237 1 631 255 1 761 29 4 275 90 1 899 32 2 296 95 2 044 35 0 319 100 2 196 37 8 342 105 2 397 40 6 366 110 2 026 43 3 392 115 73 493 2 705 46 1 21 533 49 7Pa 0 20inH20 Ext Static BTU Hr Watts 76 548 22 428 76 364 22 375 76 137 22 308 75 869 22 229 74 592 21 855 74 254 21 756 73 886 21 648 Watts Waits Wats Watts e00 75 257 267 rest 89 257 L sec 2 100 991 2 100 991 2 100 991 2 100 991 2 100 991 gt 3 055 CO mb h
29. 36 14x30 16x26 18x23 3400 380 22 12 36 14x30 16x26 18x23 3600 452 24 x38 16x32 18x28 20x25 4800 452 24 x38 16x32 18x28 20x25 5250 531 26 16x38 18x32 20x30 22x24 6125 66 28 18x38 20x34 22x30 24x28 6500 66 28 18x38 20x34 22x30 24x28 7250 77 30 20x40 22x38 24x32 26x30 707 30 20x40 22x38 24x32 26x30 804 32 22x40 24x38 26x34 28x32 9200 804 32 22x40 24x38 26x34 28x32 9800 98 34 24 42 25x40 26x38 28x34 908 34 25x40 26x38 28x34 2x4 30x36 32x34 33x33 Pb 3 32x38 34x36 35x35 5 34 40 36x38 37 37 01 JUN 2012 Page 15 gt lt gt lt j N Return Air Airflow Diameter 11 Es A 001583MAN 02 Direct Expansion Loop Connection Charging LINE SET INTERCONNECT TUBING Once the outside loops have been installed and run into the building the piping to the ports on the unit can be constructed Each line set has a liquid line and a vapour line The vapour line is 1 2 OD and the liquid line is 3 8 OD For horizontal loops both lines are 1 2 OD reduce one of the lines in each line set down to 3 8 OD before running the lines over to the heat pump These reduced lines will be the liquid line for each line set Do a final pressure check on each line set and then remove the pressur
30. 4 105 40 6 21 1 70 0 21 1 70 0 21 1 70 0 21 1 472 1 000 472 1 000 472 31 2 89 5 32 0 91 0 32 8 10 1 19 5 10 9 21 0 11 6 5 252 19 249 5 640 20 652 6 051 1 000 92 5 22 5 22 139 472 33 6 12 5 6 487 O 37 3Pa 0 15inH20 Ext Static DX 25 HACW P 1S Cooling Mode 410 60 Hz asta 1 412 4 930 LI LI LI LI LI Oi B O N 2228 O P gt N Te N 7 0 4 5 2 2292 342 2357 5 O PN N Power Consumption 21 1 PSIG kPa 237 1 631 255 1 761 270 1 899 296 2 044 319 2 196 342 2 397 366 2 026 BTU Hr Watts 29 701 8 702 29 338 8 596 28 973 8 489 28 609 8 382 28 462 8 339 28 100 8 233 27 745 8 129 392 115 27 400 2 705 46 1 8 028 37 3Pa 0 15inH20 Ext Static Waits Watts 6776 16703 29 569 8639 16 453 23 002 1885 4673 esse 5 6227 15435 21 661 Usec i m i m i i Compressor ZPS20K4E PFV F iN N 9 s 1 099 O 5 cS 1 185 O N e e 29 4 90 32 2 95 35 0 100 37 8 105 40 6 110 43 3 O E 1 274 4 4 O h N 65
31. High Low Heart T Pres Pres Beat O O I 6 Female Male AA TER To 170 Pianiaon 15 Geddes Petitcodiac NB Checked B Dat GEOTHERMAL IRAM MARITIME Approved __ ENG Date Drawing Name Chris Geddes NCB Lap Top Communication Cable Approved By MFG A 000301CDG 01 1 of 1 ECO IMPL BY APVD BY DATE 01 JUN 2012 Page 11 001583MAN 02 Sizing and Ductwork HEAT PUMP SIZING TABLE 8 depicts a rough guideline as to the size of home each heat pump size can handle direct expansion installations TABLE 8 Heat Pump Size vs Heated Area B s 39 1 400 130 2 000 185 THE TABLE ABOVE IS FOR INFORMATION ONLY IT SHOULD 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 16 the area of the main level The tables ac count for a basement the same size as the heated area Size tons 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
32. OOTING Fault Possible Cause Verification Recommended Action 24VAC signal Faulty Plenum Heater 24VAC is present across pin 1 and Replace relay from 1 to ground Relay in heat pump pin 3 of the relay 24VAC is present at the plenum from heat pump terminal strip to heater control plenum heater ground but not from connector heat pump terminal strip 1 to ple num heater ground Thermal overload Fan not operating See Fan Not Operating section Correct problem Reset thermal is tripped overload Faulty overload Reset thermal overload Replace if faulty DOMESTIC HOT WATER DHW TROUBLE SHOOTING ____ ___ Possible Cause Verification Recommended Action Insufficient hot Thermostat on hot water Visually inspect the setting Readjust the setting to 120 F water tank set too low Should 140 F 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 If switch is open determine breaker to hot water tank why Reset button tripped on Check voltage at elements with Push reset button hot water tank multimeter Insufficient hot Circulator pump not Visually inspect the pump to see if Replace if faulty water operating shaft is turning Use an amprobe to Heat Pump Prob measure current draw lem Blockage or restriction in Check wat
33. Pump Size vs Heated Area 12 Table 9 Heat Pump Size vs Hot Air Grills 12 Table 10 Plenum Heater iaa 13 Table Ti DUCE SIZING QUITO Deo Usu 15 Table 12 DX Charge Chart Page 16 Table 13 Heating TXV Adjustment Record Column Descriptions Page 21 Table 14 Standard Capacity Ratings Heating 60 2 02000 1 Page 37 Table 15 Standard Capacity Ratings Cooling 60Hz Page 37 Table 16 Heat Pump Electrical Information 230 1 60 Page 42 Table 17 Heat Pump Electrical Information 208 3 60 Page 42 Table 18 Heat Pump Electrical Information 220 1 50 Page 42 Table 19 Heat Pump Electrical Information 380 3 50
34. V stuck almost closed or partially blocked by foreign object Low or no refrigerant charge Leaking cooling check valve Faulty NO solenoid valve coil Adjusting the TXV does not affect the superheat or the suction pres sure TXV may be frosting up Entering air temperature and air flow are good but suction is low Check static refrigeration pressure of unit for very low value Unit operates correctly when loop is in use Loop lines get cold when loop not in use instead of warming to ambient compressor frosts up Verify solenoid by removing it from the shaft while the unit is running There should be an audible click sound if the solenoid is working 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 Identify the check valve Try switching modes a few times Re place if problem continues Replace solenoid if faulty Faulty NO solenoid valve A click can be heard when the coil is energized Unused loops stay cold instead of gradually warming to ambient Compressor frosts up Replace NO valve Faulty compressor not pumping Pressures change only slightly from static values when compressor is started Replace compressor Compressor See Low Suction frosting up Pressure in this section TXV stuck almost closed or partially blocked by fo
35. a temperature difference then itis plugged Also causes low suc tion pressure Adjust TXV to obtain 8 14 F 3 8 C superheat Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Replace NO valve Replace filter drier Remove 1 2lb of refrigerant at a time and verify that the discharge pressure reduces Adjust TXV to obtain 8 14 F 3 8 C superheat Adjust TXV to obtain 8 14 F 3 8 C superheat Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Replace NO valve Replace filter drier Low refrigerant charge Faulty compressor not pumping Check static refrigeration pressure of the unit for a very low value Low discharge pressure when running Pressures change only slightly from static values when compressor is started Page 27 Locate the leak and repair it Spray nine a sniffer and dye are common methods of locating a leak Replace compressor 001583MAN 02 OPERATION TROUBLESHOOTING HEATING MODE AR LS A CO Low Suction Pressure continued High Suction Pressure may appear to not be pumping Compressor frosting up Heating TXV frosting up heavi ly Random high pressure trip does not occur while on site Random manual high pressure trip does not occur while on site 001583MAN 02 Loop piping interchanged Loop 1 connected be tween Vapour
36. ane etc it is recommended that a plenum heater be installed This pro vides two functions The first function of the plenum heater is to act as an auxiliary heat source As such it will provide additional heat on extremely cold days if the heat pump 15 unable to bring the home tempera ture up quickly enough eliminating any discomfort to the home owner The second function of the plenum heater is to provide emer gency heat should a problem occur that causes the heat pump to be locked out This can be engaged by setting the thermostat to emergency heat allowing the plenum heater to function while preventing the heat pump from operating Should the heat pump fail while the home is vacant the auxiliary function of the thermostat will maintain the temperature setting of the thermo Stat The plenum heater is powered separately from the heat pump Only two control wires are needed to connect the ple num heater to the heat pump Refer to the label on the plenum heater or the electrical box diagram on the inside of the electri cal box cover of the unit for details on the connections The plenum heater should be mounted in the supply duct in a manner that allows all of the airflow to pass through it to prevent any hot spots in the heater elements 01 JUN 2012 Page 13 TABLE 10 shows the recommended size plenum heater as well as the wire size and breaker size needed to provide power to the plenum heater TABLE 10 Plenum Heat
37. angers reversing valve body and refrigerant metering device for ten 10 years from the Warranty Inception Date as defined below 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 Other accessories when purchased separately for 1 year from the date of shipment from MG shipment from MG whichever comes first 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 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 origina warranty period 1 3 5 The Warranty Inception Date shall be the date of original unit installation as the date on the installation Startup Record six 6 months from date of unit 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 Iwarranty part that is covered by this Limited Express Residential Warranty only to t
38. apacitor 208 24VAC Capacito Domestic Hot Water Circulator Pump Instructions GND i 230VAC Compressor Contactor If heat pump is to be operated without the hot water AA circulator connected to the water tank and flooded 115 with water remove the brown wire with the insulated L2 terminal located here This pump is water N lubricated and must not be run dry Once 11 connected the external ON OFF switch may be used A to temporarily turn the pump off Gnd hd Label Potential Relay IMPORTANT NOTE Heat Pump Electrical Service Requirements FOR 208 1 60 POWER 208 230VAC Single Phase 60Hz 208 230 1 60 230 115VAC CONNECTIONS Ensure red wire is connected E m Wire Colour Contactor to the 208 terminal on the 25 22 10 3 30 L2 L3 transformer instead of the 45 28 8 3 40 L2 230V terminal 50 L1 L1 Connect Gnd to Gnd Lug y DU E GEOTHERMAL Pettcodiag NB AAA MARITIME 1 reno Name DX HAC P 1S DE d ERE Electrical Box Diagram Eco we BY BY DATE We PLA 001562ELB 02 1 of 1 001583MAN 02 Page 46 01 JUN 2012 CASE DETAILS FILTER RACK FOR 32130 AIR FILTER PLENUM HEATER ELECTRICAL SERWICE DHW IN 112 FPT DHW OUT 1 2 242 THERMOSTAT D WIRE 2 COND DRAIN INT TRAPPED 15 8 3 4 PVC INS EL 33 3 4
39. as well as in the Model Specific section of this manual The Electri cal Tables in the Model Specific section and the ELB diagram contain information about the size of wire for the connections as well as the recommended breaker size A properly qualified electrician should be retained to make the connections to the heat pump and associated controls The connections to the heat pump MUST CONFORM TO LOCAL CODES THERMOSTAT REQUIREMENTS The DX Series unit requires a two stage heating and one stage cooling thermostat with relay outputs for proper operation Triac output thermostats are incompatible with the control board in the heat pump The stages are S1 Compressor S2 electric auxiliary heating only One can be purchased with the unit or other thermostats with the same number of stages can be used The electrical box diagram ELB on the electrical box cover and TABLE 1 provide a description of the signals TABLE 1 Control Signal Description Description ic 24VAC Common Ground C G Y Fan low speed for air circulation Ry 24VAC Hot Heat Pump Stage 2 auxiliary heat Emergency Heat Cooling Mode reversing valve Yo Not Applicable Airflow Reduction de o Plenum Heater dry contact 1 PlenmHeaterdryconact Connect AR to with a dry contact to reduce the air flow by 1596 Refer to the Fan Motor sub section for more information FAN MOTOR The unit is equipped with a direct d
40. code requires a higher setting The pre heat tank does not require electric elements This setup takes full advantage of the desuperheater as it is the sole heat provider to the pre heat tank The desuperheater 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 do mestic hot water ines as shown in the diagram a pressure relief valve must be installed to prevent possible damage to the domestic hot water circulator pump should both valves be closed 001583MAN 02 Page 7 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 DHW OUT E 1 2 1 2 1 2 Ball Check Boiler Valve Valve Drain NOTE Refer to the heat pump labels for connection locations 1 2 COPPER LINES Insulate with 5 8 pipe insulation OPTIONAL must install both DHW IN 1 2 HEAT PUMP CONNECTIONS 1 2 Union 2 e 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 PRV Valve DHW OUT 1 2 1 2 MET NOTE Refer to the heat pump labels for connection
41. d clear of any objects that would restrict the airflow Verify that a new air filter is installed and the cover 1 secured Verify the condensate is connected properly vented and free of debris If a plenum heater has been installed verify that it is securely fastened to the ductwork ORAON Line Sets Inside structure 1 Verify that all line sets are connected to the proper ports on the heat pump 2 Verify that the line sets are completely insulated and securely fastened in place 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 electrical box Refer to the schematic diagram for more information Electrical 1 Ensure the power to the unit is off Ensure the power to the plenum heater is off if equipped 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 3 Record the fuse circuit breaker size and wire gauge for the heat pump Record the fuse circuit breaker size wire gauge
42. dering and pressure testing is complete Ensure that all individual pieces of pipe insulation are glued to each other so there are no gaps SILVER SOLDERING LINE SETS Once all the line sets have been routed insulated and fastened in place the connections to the heat pump ports can be made Remove the pressure from the heat pump and cut the ends off of the Liquid and Vapour ports Remove the caps from the line set tubing The line sets can be connected to the ports on the heat pump using couplings or alternately the tubing can be swaged The joints should be silver soldered with 5 silfos Maritime Geothermal Ltd absolutely requires that dry nitrogen be bled through the system during all silver soldering procedures so that no oxidation occurs on the inside of the copper tubing The service ports on the unit can be used to connect the nitrogen with a refrigeration manifold If necessary a wet rag can be wrapped around the each of the ports to prevent melting the grommet when silver soldering Ensure that no water enters any of the ports or tubing 001583MAN 02 Page 16 PRESSURE TESTING Once all connections are complete the system should be pressure tested to 100PSIG 690kPa with dry nitrogen Check all joints at the unit and any made in the interconnect tubing for leaks using soap suds Spray nine etc It is important not to bypass this step as vacuuming the system with a leak will be impossible and attempting to do so
43. dry contacts Fan speed can be reduced by 15 for zone applications Plenum Heater Wiring 9 U Compressor 2 Run Capacitor A 208 230 24 Transformer 75VA Field E Use an 18 2 conductor cable 4 iaa to connect Electrical 1 1 to OUR UY 68 Plenum Heater C 1 1 1 15 Domestic Hot water Circulator Pump Instructions HACW 12 Note heat pump is to be N operated without the hot water L1 circulator connected to the water Gnd tank and flooded with water remove the brown wire with the E insulated terminal located here gt Gnd Lug This pump is water lubricated and must not be run dry Compressor Contactor IMPORTANT NOTE Heat Pump Electrical Service Requirements FOR 208 1 60 POWER 208 230VAC Single Phase 60Hz 208 230 1 60 230 115VAC CONNECTIONS Model Min Circuit Min Wire TD Fuse or Contactor _ Ampacity Gauge Breaker Wire Colour contacter L2 Red N White L1 Black Connect Gnd to Gnd Lug Ensure red wire is connected to the 208 terminal on the transformer instead of the 230V terminal 170 Plantation Rd Checked EAZ oda ecke ate 242 6 4 Chris Geddes 27 SEP 11 A Approved By o DX H P 1S DE TJ Electrical Box Diagram ECO IMPL BY APVD BY DATE
44. e and cut the ends off the lines The heat pump has ports labeled Liquid 1 to 5 and Vapour 1 to 5 Run each line set over to the designated ports on the heat pump Refer to Diagram 001638CDG for more information on how to connect to the heat pump The tubing used for this procedure must be refrigeration tubing cleaned amp dehydrated suitable for the job Every effort must also be made to insure that the tubing does not become contaminated during installation We recommend that caps be placed on the open ends of tubing immediately after cuts are made and that these caps are only removed after all bends have been made and the pipe fixed in its permanent location ready to make the silver soldered joints It is very important to keep refrigeration system perfectly clean and dry Removing the caps just prior to silver soldering will ensure minimum exposure to the humidity in the atmosphere PIPE INSULATION All line set 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 during the heating season lt can be slid onto the capped tubing without having to slice it down the side Ensure that any joints in in the line sets are accessible for leak testing Liquid and Vapour ports and any remaining exposed tubing should be insulated with 3 8 thick closed cell pipe insulation once the silver sol
45. e between any two termi nals is below the specified value Remove wires from compressor Check for infinite resistance be tween each terminal and ground Replace the compressor Replace the compressor If any terminal to ground is not infinite replace the compressor Seized compressor due to Compressor attempts to start but locked or damaged mechanism Start capacitor faulty Single phase only Potential Relay faulty Single phase only 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 with new one and verify compressor starts properly Compressor is tight due Compressor attempts to start but to damaged mechanism trips its internal overload after a few seconds Run capacitor has been verified already Page 26 Attempt to rock compressor free If normal operation cannot be established replace compressor Replace if faulty Remove black residue in electrical box if any Replace if faulty Attempt to rock compressor free If normal operation cannot be es tablished replace compressor 01 JUN 2012 OPERATION TROUBLESHOOTING HEATING MODE L Faul Possible Cause Verification Recommended Action High Discharge Pressure Surging Discharge Pressure Low Suction Pressure 01 JUN 2012 Air Flow See Fan Troub
46. e display is present on the thermostat If it is not proceed to POWER SUPPLY TROUBLE SHOOTING otherwise proceed to STEP 2 Remove the door and electrical box cover and check to see if the or LOW LED s are flashing or on Record The results Turn the power off wait 10 seconds and turn the power back on Set the thermostat to call for heating or cooling depending on the season If a 24VAC signal does not appear across Y1 and C of the terminal strip within 6 minutes proceed to the THERMOSTAT TROUBLESHOOTING section otherwise proceed to STEP 4 If the or LOW LEDs flash and the compressor does not attempt to start proceed to the SAFETY CONTROL TROUBLESHOOTING section otherwise proceed to STEP 5 If HI or LOW pressure LED s are not flashing and the compressor does not attempt to start attempts to start but cannot starts hard or starts but does not sound normal proceed to the COMPRESSOR TROUBLESHOOTING section otherwise proceed to STEP 6 If the compressor starts and sounds normal this means the compressor is OK and the problem lies elsewhere Proceed to the OPERATION TROUBLESHOOTING section POWER SUPPLY TROUBLESHOOTING Fault Possible Cause Verification Recommended Action No power to the Disconnect switch open Verify disconnect switch is in the Determine why the disconnect heat pump if installed ON position switch was opened if all is OK close the switch Fuse blown At heat pump disconnect box Reset break
47. eat 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 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 t
48. er Sizing Size Size Current Breaker 5 kW A A 10 40 60 6 100 _ 125 CONDENSATE DRAIN The unit comes equipped with a 3 4 PVC socket fitting female labeled Condensate Drain This drain allows the con densate which forms during the air conditioning cycle to be re moved from the unit The drain should be connected as per local codes During high humidity weather there could be as much as 25 gallons of water formed per day Care should be taken in the spring to ensure that this pipe is not plugged with dust that has collected during the winter caus ing the condensate to overflow into the bottom of the heat pump and onto the floor The condensate drain is internally trapped however proper venting is required external to the heat pump Refer to local codes to ensure the installa tion is done properly Drawing 000606CDG shows a typical installation 001583MAN 02 Typical Duct and Condensate Connections Vertical Case Hot Air Out Supply Ducts should be sized as per the Duct Sizing table in this manual Hot Air Out Supply Cold Air In Return Flexible Duct Collar minimum lt 12 above plenum heater elements if installed Optional Electric Plenum Heater Flexible Duct Collar Air filter Filter Rack Can be mounted to the left or right Accoustic insulation may be used inside the ducts near the unit to dampen any air noise that may be
49. er flow and power to Remove obstruction in water the water line or hot water pump Check water lines for lines Acid treat the domestic hot heat exchanger obstruction water coil Faulty DHW cutout failed Check contact operation Should Replace DHW cutout if faulty open close at 120 F and open at 140 F Heat pump not running Note the amount of time the heat Temporarily turn up the tank enough hours to make pump runs in any given hour thermostats until colder weather sufficient hot water creates longer run cycles Water is too hot Faulty DHW cutout failed Check contact operation Should Replace DHW cutout if faulty closed close at 120 F and open at 140 F Thermostat on hot water Visually inspect the setting Readjust the setting to 120 tank set too high Should 140 F if required by local code be set at 120 F 140 F if required by local code Dole flow control Valve The Dole flow control is a simple self cleaning device designed to deliver a constant volume of water from any outlet whether the pressure is 15 psig or as high as 125 psi The controlling mechanism consists of a flexible Digital orifice that varies its area inversely with In line Flowmeter pressure so that a constant flow is maintained 2 Multimeter Voltmeter 01 JUN 2012 Page 33 001583MAN 02 REPAIR PROCEDURES PUMP DOWN PROCEDURE Connect the refrigerant recovery unit to the h
50. er or replace fuse Breaker Tripped voltmeter shows 230VAC on the with proper size and type Time line side but not on the load side delay type No display on Blown Primary or Second Visually inspect Remove fuse and Replace fuse thermostat ary fuse on transformer check for continuity if in doubt Blown fuse on control Visually inspect Remove fuse and Replace fuse board 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 wiring between heat 24 is not present across C and Correct the wiring pump and thermostat of the thermostat Faulty Thermostat 24VAC is present across C and Replace thermostat Ru of the thermostat but thermo stat has no display 001583MAN 02 Page 24 01 JUN 2012 THERMOSTAT TROUBLESHOOTING Possible Cause Verification Recommended Action No Y1 signal to Incorrect thermostat set Thermostat does not indicate call Correct the setup heat pump up for heat No 24VAC signal present after 6 minutes across C and Stage 1 of the thermo stat Faulty thermostat to heat 24VAC signal present across Stage Correct or replace wiring pump wiring 1 and C of the thermostat but not present across Y1 and C of the ter minal strip Faulty thermostat 24VAC between Stage 1 and Replace ther
51. es CONTROL BOARD All heating cooling direct expansion units contain a con trol board that monitors the thermostat signals safety controls and loop pressures lt controls the operation of the compressor fan and auxiliary emergency heat lt also activates the revers ing valve and controls the loop sequencing when in cooling mode Heating only units do not have a control board The number of cooling loops must be configured done at the factory There are two jumpers to the top right of the micro controller The configuration is shown in TABLE 4 There is also a jumper marked DEFAULT that should be left in place The jumper marked IF NO B TERMINAL should be left place as well unless the thermostat used has a B terminal that is constantly powered in heating mode TABLE 4 Cooling Loop Configuration of Loops Left Jumper Right Jumper The control board has 4 connectors one for the thermostat connections one for the heat pump component connections one for the loop solenoid connections and one for the safety control and loop pressure switch connections There are also several LEDs to indicate the status of the control board Refer to drawing 000301CDG for the location of the connectors and LEDs The Heart Beat LED flashes once every second This indi cates that the control board is operational An on board COP watchdog timer resets the microprocessor should anything af fect code execution The high and l
52. exible collars be used to connect the main trunks to the heat pump This helps prevent any vibrations from travelling down the ductwork If a plenum heater is in Stalled the collar should be at least 12 away from the heater elements The first 5 10 feet of the main supply trunks should be insulat ed with acoustical duct insulation to further inhibit any noise from the unit from travelling down the ductwork If a plenum heater is installed insulation should not be placed within 12 of the heater elements Drawing 000606CDG shows a typical installation DUCT SYSTEMS GRILL LAYOUT Most forced air heating systems in homes have the floor grills placed around the perimeter of the room to be heated Supply grills should be placed under a window when possible to help prevent condensation on the window As mentioned in the pre vious sub section supply grill leads should be 6 in diameter 28 sq in each to allow 100cfm of air flow In a typical new construction there should be one supply grill for every 100sq ft of area in the room When rooms require more than one grill they should be placed in a manner that pro motes even heat distribution such as one at each end of the room It is always a good idea to place a damper in each grill supply or place adjustable grills so that any imbalances in the heat distribution can be corrected 12 01 JUN 2012 The total number of supply grills available is based on the heat pump nominal airfl
53. f time The goal is to obtain a superheat value of 8 14 F 4 8 C on each evaporator loop It is good practice to average out the last few readings as the TXV s tend to cycle causing the superheat to vary Adjusting a TXV in clockwise increases the superheat of its evaporator loop Adjusting a TXV out counter clockwise decreases the superheat of its evaporator loop Adjusting one affects the remaining evaporator loops adjustments must be small and done to only one at a time Adjustments are done every other time interval ie every 10 minutes The next two intervals should be averaged together for the next adjustment Always adjust the TXV that is the furthest out ADJUSTMENT PROCEDURE Fill in the information section at the top of the adjustment record sheet Circle F or C at the top right Record all data for the initial readings elapsed time 0 Adjust the TXV for the loop that is the furthest out Record the num ber of the TXV how much it was adjusted in turns ie 1 4 1 2 1 and in which direction it was adjusted Record the new position of the adjusted in the appropriate P column of the next row Record the remaining TXV positions in their indi vidual P columns in the next row At the next time interval record the data in the current row Verify that the superheat of the adjusted TXV has changed in the desired direction Do not adjust the TXV Mark in the TXV Turns and In Out columns A
54. have been removed or defaced Products on which payment to MG or to the owner s seller or installing contractor is in default Products subjected to improper or inadequate installation maintenance repair wiring or voltage conditions Products subjected to accident misuse negligence abuse fire flood lightning unauthorized alteration misapplication contaminated or corrosive liquid or air supply operation at abnormal air or liquid temperatures or flow rates or opening of the refrigerant circuit by unqualified personnel Mold fungus or bacteria damage Corrosion or abrasion of the product 0 Products supplied by others 1 Products which have been operated in a manner contrary to MG s printed instructions 2 Products which have insufficient performance as a result of improper system design or improper application installation or use of MG s products 3 Electricity or fuel or any increases or unrealized savings in same for any reason whatsoever cept for the limited labour allowance coverage set forth above MG is not responsible for 1 1 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
55. he vacuum pump and open the charging manifold valves Vacuum until the vacuum gauge remains at less than 500 microns for at least 1 minute with the vacuum pump valve closed STEP 3 Close the charging manifold valves then shut off and disconnect the vacuum pump Place a refrigerant tank with the proper refrigerant on a scale and connect it to the charging manifold Purge the hose to the tank STEP 4 Weigh in the appropriate amount of refrigerant through the low pressure suction service port Refer to the label on the unit or the Charging The system section for the proper charge amount 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 Pump down the unit as per the Pump Down Procedure above Replace the compressor Replace the liquid line filter drier Vacuum the unit until it remains under 500 microns for several minutes with the vacuum pump valve closed STEP 4 Charge the unit 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 Pump down the unit and replace the filter drier STEP 6 Charge the unit refrigerant can be re used and operate it for 2 weeks Pump down the unit and
56. he O signal should be set to active in cooling mode 3 Measure the following voltages on the compressor contactor and record them on the startup sheet L1 L2 L2 L3 L1 L3 Heating Mode 1 Set the thermostat to heating mode and adjust the setpoint to activate Stage 1 The fan should slowly ramp up to speed after the time delay of the thermostat expires if applicable and the compressor will start 2 Check the refrigeration gauges The suction and discharge pressures will depend on the loop temperatures but they should be about 75 95PSIG and 290 365PSIG respectively for a typical start up If the unit was not completely charged add the remaining refrigerant through the suction side only 3 Monitoring the refrigeration gauges while the unit runs Record the following data at the time interval s indicated Numbers 1 to 4 record at 10 15 20 25 30 and then average the values Record numbers 5 to 8 at 30 minutes The average superheat for each line set should be 8 14 F 4 8 C The TXV s are set to four turns in from all the way out at the factory and typically should not require any adjustments Should adjustment be required follow the Heating TXV Adjustment procedure in this manual Proceed to Step 4 once adjustments have been completed 1 Suction pressure 2 Discharge pressure 3 Each loop Vapour Line temperature 4 Each loop superheat Vapour line temperature evaporating temperature from suction gauge 5 Duct Return tempera
57. he extent specifically set forth in the current labour allowance schedule A provided by MG s Department and only as follows MG Units for two 2 years from the Warranty Inception Date dem 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 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 not covered by this Limited Express Residential Warranty to the extent they exceed the amount allowed under said allowance schedule they 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 1 Air filters fuses refrigerant fluids oil 2 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
58. il is energized but hot gas is still di rected to the air coil Discharge pressure will continue to rise even if there is a loop switch Loop LED does not come on around 480PSIG Shorting S and S causes the LED to come on Replace reversing valve Replace loop pressure switch Faulty Loop Pressure switch Input Faulty reclaim valve sole noid Faulty reclaim valve Faulty control board out put L1 to L5 Shorting S and S does not cause the Loop Switch LED to come on or does not cause a loop change Verify solenoid by removing it from the shaft while energized If there is no click the solenoid is bad A click can be heard when the valve is selected but the unit still trips out Loop LED does not come on or there is no 24VAC across the loop output and C of the control board when the loop is selected Faulty NO Solenoid coil or Continuous loop changing every 7 seconds in two loop mode high suction pressure hot compressor Cooling TXV adjusted too far closed or stuck or par tially blocked Continuous loop changing every 7 seconds in two loop mode low suction pressure Replace the control board Replace reclaim solenoid coil Replace the reclaim valve Replace the control board With O energized compressor off slide the coil up and down the shaft If clicking can be heard the coil is OK Adjust TXV or replace if faulty Unit overcharged Loop field saturated Frequent
59. ion Should a fuse blow determine the problem and rectify it before replacing the fuse or resetting the breaker NOTE For 208 230VAC 1 60 units if connecting to 208VAC power supply move the red wire connected to the 240 terminal of the transformer to the 208 terminal of the transformer SAFETY CONTROLS The heat pump has two built in safety controls which are designed to protect the unit from situations which could damage it should the operation of the refrigeration circuit fall outside the allowable operating range A Low Pressure Control The low pressure control monitors the compressor suction pressure and will shut the compressor down if the refrigerant evaporating pressure becomes too low There only reason this control would activate in response to the operating conditions of the unit in the heating mode would be due to a ruptured loop causing a low refrigerant charge Any other low pressure trips would be due to a fault in the unit B High Pressure Control The high pressure safety control monitors the compressor discharge pressure and will shut the compressor down if the condensing pressure becomes too high There are 3 main reasons why this control would activate in response to the operating conditions of the unit while operat ing in heating mode 1 Low or no airflow 2 High return air temperature 3 Dirty air coil due to poor filter maintenance Each of the controls are auto reset controls There is also a man
60. is in use Loop lines get cold when loop not in use instead of warming to ambient com pressor frosts up Adjusting the TXV does not affect the superheat or the suction pres sure See Fan Troubleshooting section Points pitted or burned Contactor sometimes sticks causing the com pressor to run without the fan trip ping the high pressure control Page 28 Identify the check valve Try switching modes a few times Replace if problem continues Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Correct the problem Replace contactor 01 JUN 2012 OPERATION TROUBLESHOOTING COOLING MODE A TTT Heating instead of cooling High Pressure control trips High Pressure control and man ual high pressure control trips very fast Loop changes occur too fre quently 01 JUN 2012 Thermostat not set up properly Verify that there 15 24VAC across O B W1 and of the terminal strip when calling for cooling Correct thermostat setup Change to a different thermostat Faulty reversing valve so lenoid coil Verify solenoid by removing it from the shaft while the unit is running There should be a loud whoosh sound when it is removed Dis charge pressure will continue to rise even if there is a loop switch Replace solenoid if faulty Faulty reversing valve Faulty Loop Pressure switch A click can be heard when the co
61. kPa 319 2196 328 2259 337 2324 347 2390 357 2458 366 2526 377 2597 387 2668 oF 100 37 8 102 38 9 104 40 0 106 41 1 108 42 2 110 43 3 112 44 4 114 45 6 Heating Mode Nominal 4 ton in R410a 60 Hz CFM L sec oF m BTU Hr Watts 70 0 21 1 70 0 1 700 88 1 802 31 2 1 700 89 6 18 1 10 0 19 6 29 971 8 781 32 441 21 1 70 0 21 1 70 0 802 32 0 1 700 91 2 802 32 9 1 700 92 9 10 9 21 2 11 8 22 9 9 505 35 083 10 279 37 904 21 1 70 0 21 1 802 33 8 1 700 95 7 802 35 4 12 7 25 7 14 3 11 106 42 594 12 480 70 0 21 1 70 0 21 1 70 0 21 1 1 700 97 7 802 36 5 1 700 99 9 802 37 7 1 700 1102 2 802 39 0 27 7 15 4 29 9 16 6 32 2 eS 45 951 13 464 49 519 14 509 53 304 15 618 37 3Pa 0 15inH20 Ext Static DX 55 HACW P 1S Cooling Mode 410 60 Hz Power Consumption BTU Hr Watts wars wars Watts 61 16 828 36 807 53 635 e 61 N N ES A NI O al O N L O O J J J J 52 340_ 15 336 51 516 15 094 50 636_ 99 4 655 10 181 14 836 _ 46393 13 593 132987 5 h no oO O ma Y mb O J O
62. leshooting section Correct the problem Heating TXV s adjusted too far closed One or more heating TXV s stuck too far closed Faulty Normally Open so lenoid valve stuck closed Filter drier plugged Unit is overcharged Heating TXV s adjusted too far closed Heating TXV s adjusted too far closed One or more heating TXV s stuck too far closed Faulty Normally Open so lenoid valve stuck closed May actually draw a vacuum Filter drier plugged Verify superheat It should be be tween 8 14 3 8 C Superheat will be high if TXV s are closed too far Adjusting the TXV does not affect the superheat or the suction pressure A click can be heard when the coll is energized but the valve is cold in stead of warm Feel each end of the filter drier it should be the same temperature If there is a temperature difference then it is plugged Also causes low suc tion pressure High sub cooling low delta T across air coil Verify superheat It should be be tween 8 14 F 3 8 C Superheat will be high if TXV is closed too far Adjusting the TXV does not affect the superheat or the suction pressure TXV may be frosting up Adjusting the TXV does not affect the superheat or the suction pressure A click can be heard when the coil is energized but the valve is cold in stead of warm Feel each end of the filter drier it should be the same temperature If there is
63. locations Domestic COLD IN from well DHW IN 1 2 FPT LL Approved By Das REV Eco APVD pare 001583MAN 02 Chris Geddes 10 MAR 09 o po S O y o Chris Geddes 10 MAR 09 D N Approved ENG Date rawing Name Chris Geddes 10 MAR 09 Ball Valve 125psig Pressure Relief Valve Insulated t Domestic Hot Water Pre Heat Tank Pressure Relief alve Insulated Domestic Hot Water Pre Heat Tank Page 8 GEOTHERMAL Single Unit Connection DHW Pre Heat Tank Brass FPT Size Drawing Number REV SHEET Ball Valve Domestic HOT OUT to house or mixing valve 1 25psig 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 F 50 60 C Electric or Gas Insulated Domestic Hot Water Tank 170 Plantation Rd Petitcodiac NB E4Z 6H4 01 JUN 2012 Direct Expansion Unit Operation REFRIGERATION Direct expansion operation 15 essentially the same as any other heat pump The main difference 16 in the outdoor loop section Direct expansion heat pumps eliminate the intermedi ate ground loop exchanger and pumping equipment by using copper loops to interact directly with the earth For each ton of capacity the e
64. mostat of the thermostat when a call is indi cated the thermostat SAFETY CONTROLS TROUBLESHOOTING Fault Possible Cause Verification _ Recommended Action High Pressure Faulty High Pressure Con Hi LED is flashing Short to Hon Replace high pressure control if Control trol open the connector at the left of the con LED stops flashing replace con HP pressures must be at trol board and verify whether the trol board if it does not static levels LED stops flashing or remains flash ing Low Pressure Faulty Low pressure con Lo LED is flashing Short L to L Replace low pressure control if Control trol open the connector at the left of the con LED stops flashing replace con Must be a signal present trol board and verify whether the trol board if it does not on Y1 for this test LED stops flashing or remains flash HP pressures must be at static levels Unit out of refrigerant Check static refrigeration pressure Locate the leak and repair it of the unit for a very low value Spray nine a sniffer and dye are common methods of locating a leak 01 JUN 2012 Page 25 001583MAN 02 COMPRESSOR TROUBLESHOOTING Possible Cause Verification Recommended Action Compressor will not start Compressor starts hard 001583MAN 02 Manual High pressure control tripped Faulty control board Faulty run capacitor Single phase only Press the button on the control i
65. mostat setpoint and suction pressure at cycle end psig A total of three copies are required one for the homeowner one for the installer and on to be sent to Maritime Geothermal Ltd 001583MAN 02 Page 20 01 JUN 2012 Heating TXV Adjustment If it is determined during the start up procedure that one or more of the heating TXV s need to be adjusted the following proce dure and record sheet should be used to ensure that adjustments are recorded and performed in a systematic way TABLE 13 describes what each of the columns in the Heating record sheet table represents TABLE 13 TXV Adjustment Record Column Descriptions Colunm Description Time EL Elapsed time since the first reading Common ET Evaporating temperature from suction gauge or P T chart Loop P Loop TXV position Number of turns in from all the way out Loop S Loop Superheat Vapour Line temperature Evaporating temperature Turns The number of turns the TXV 15 being adjusted In Out The direction the TXV is being adjusted In clockwise OUT counter clockwise The heating TXV s are set to four turns in from all the way out at the factory This should be sufficient for most installa tions however it is sometimes necessary to make adjustments if the ground conditions vary or if the loop lengths vary The procedure below explains how to properly adjust the TXV s so that the task can be completed in the minimum amount o
66. nfiguration Ignore low pres for Data Bits 8 Stop Bits 1 defaults values TABLE 6 Control Board Commands Help displays the list of commands Lock unlock the COP watchdog Display loop status Display system configuration System runtimes 1 Advance system time by 59 minutes 27 Reset loop timers to zero Display loop history Display system status U L D 7 001583 02 10 01 JUN 2012 NCB Lap Top Communication Cable NCB Adaptor Cable DB9 PINOUT 2 Rx 3 Tx 5 GND Take a 9 pin serial cable and cut the male end off A 0 100 spacing 4 pin header can be obtained from a floppy drive power cable an old computer Connect the wires as shown in the diagram above A multimeter set to continuity may be used to find the correct wires fron the 9 pin cable A small paper clip will fit in the 9 pin connector holes Hyperterminal can be used to communicate with the control board The com ports settings are 9600 baud 8 data bits no parity 1 stop bit Xon Xoff control The board echos commands so echo is not required in hyperterminal Once connected press H to display the available commands for the control board E M M O m CRLOWYBG A Default if no Lap 9 Adaptor Cable Serial Port O Microprocessor Loop O m
67. on Vertical 45 3 55 4 65 5 Fan Discharge T Top S Side Functions 4 H Heating Fan Motor AC Active Cooling E EOM Variable Speed W Domestic Hot Water Fan Type Refrigerant 4 D Direct Drive 410 Air Coil Voltage Code S Standard 1 230 1 60 VAC 2 208 3 60 VAC C 6 220 1 50 VAC 7 380 3 50 Yes Compressor Stages 4 4 S 1 Stage 001583MAN 02 Page 2 01 JUN 2012 01 JUN 2012 APPLICATION TABLE 25 O al FUNCTION REFRIGERANT VOLTAGE STAGES 1 HW HACW I HACW HACW I HACW EXTRA FAN REVISIONS LOOP CASE N A BLANK or L BLANK or L BLANK or L BLANK or L SDELF or SDERF SDELF or SDERF SDELF or SDERF SDELF or SDERF N A N A N A This manual applies only to the models and revisions listed in this table Page 3 001583MAN 02 Table of Contents TABLES DIAGRAMS amp DRAWINGS 2 2 2 5 INSTALLATION INFORMATION gt tocino PAGE 6 UNT GES CHIU OI X X M Page 6 2 Page 6
68. ood service DOMESTIC HOT WATER CONNECTIONS HW amp HACW only A typical piping diagram for a pre heat tank configuration 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 CONNECT THE DESUPERHEATER TEMPERATURES COULD REACH 200F SHOULD THE DHW CUTOUT SWITCH FAIL POTENTIALLY RUPTURING PEX PIPING WARNING USE ONLY COPPER LINES Ensure the tank 1 filled with water and under pressure before activating the heat pump Slightly loosen the boiler drain on the DHW Out pipe to allow air to escape from the system before the unit is started This step will make certain that the domestic hot water circulator in the unit is flooded with water when it is started CAUTION the domestic hot water pump 15 water lubri cated damage will occur to the pump if it is run dry even a short period of time Connect the brown wire with the blue insulated terminal to L1 of the compressor contactor Ensure the power 15 off when connecting the wire 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 unless local
69. ord data Circle data units Serial Country PRE START INSPECTION Connected to proper ports insulated and secured in place Domestic Hot Water All shut off valves are open Lines are full and purged Ductwork is completed dampers diverters are adjusted Registers are open and clear of objects Air filter and end cap are installed Condensate Drain is connected properly vented and free of debris Plenum heater 16 securely fastened applicable Desuperheater pump wire is disconnected High voltage connections are correct and securely fastened Circuit breaker or fuse size and wire gauge for Heat Pump Circuit breaker or fuse size wire gauge and Plenum Heater size Low voltage connections are correct and securely fastened Unit Charge Refrigerant charge be fore power 16 turned on qus kg fo STARTUP DATA Preparation Voltage across L1 and L2 L1 and L3 L2 and L3 Final refrigerant charge Lbs poo pojo op _ pop _ d y alto 14 Duct Return Duct Supply and Delta T Heating Mode 10 minutes 15 minutes 20 minutes 25 minutes 30 minutes Average Compressor L1 black wire current Domestic Hot Water functioning Thermostat setpoint and discharge pressure at cycle end Cooling Mode Suction Pressure Discharge Pressure psig Ther
70. ow TABLE 9 shows the number of grills available per heat pump size TABLE 9 Heat Pump Size vs Hot Air Grills of Grills 100 Return grills should be mounted on the floor At minimum they should be the same size as the supply grill it is highly recommended that they be 25 to 50 larger than the total supply They should be placed opposite the supply grills when possible to ensure distribution across the room For rooms re quiring more than one supply grill it may be possible to use one larger return grill if it can be centrally positioned opposite of the supply grills however it is preferred to have one return for each supply to maximize heat distribution across the room THERMOSTAT LOCATION Most homes are a single zone with one thermostat The ther mostat should be centrally located within the home typically on the main floor lt should be placed away from any supply grills and should not be positioned directly above a return grill Most installations have the thermostat located in a hallway or in the inner wall of the living room It should be noted that most homes do not have any supply ducts in the hallway This can lead to a temperature lag at the thermostat if there 16 very little movement in the hallway causing the home to be warmer than indicated by the thermostat PLENUM HEATER OPTIONAL For installations that do not already have a backup heat source such as electric baseboard wood stove prop
71. ow pressure control LEDs flash once per second when control is open They will stay on if there is a permanent lockout The loop switch LED will come on when the loop pressure switch is activated Note that the loop switch is only for cooling mode it does not affect heating mode operation There is a compressor short cycle timer default 2 minutes and also a mode switch timer default 5 minutes Both are ad justable through the control board communications port 001583MAN 02 TABLE 7 Control Board Default Settings The high pressure low pressure and loop switch are 5VDC signals The low pressure control connects to L and L on the Command control board The high pressure control connects to H and H Blower wait time after comp start The loop switch connects to S and S All other inputs and out puts are 24VAC Blower run time after comp stops Blower run time after aux heat off When the thermostat calls for heat the compressor will Aux heat on time after comp on start Stage 1 as will the fan after a short delay adjustable ai wil until the thermostat 15 211 the unit Comp off if low lockout HEAT shuts off the fan will continue to run for an adjustable period Comp off if low lockout COOL or a set period of time elapses default 40 minutes Should the Comp off if high lockout HEAT set period elapse the auxiliary heat Stage 2 will be engaged to E help the unit on cold days when the load
72. part 1 3 Transportation costs of the defective part from the installation site to MG or of the return of that part if not covered by MG s Limited Express Residential Warranty 4 The costs of normal maintenance m X This Limited Express Residential Warranty applies to MG Residential Class products manufactured on or after February 15 2010 MG S LIABILITY UNDER THE TERMS OF THIS LIMITED WARRANTY SHALL APPLY ONLY TO THE MG UNITS REGISTERED WITH MG THAT BEARS THE MODEL AND 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 8 DEALER INSTALLER AND RECIEVED BY MG LIMITED WITHIN 90 DAYS OF START UP Limitation This Limited Express Residential Warranty 15 given in lieu of all other warranties not withstanding the disclaimers contained herein it is determined that other warranties exist any such express warranty including without imitation any express warranties or any implied warranties of fitness for particular purpose and merchantability shall be limited to the duration of the Limited 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 af
73. present Ensure there is no insulation within 12 of the plenum heater if Condensate Drain 3 4 PVC Socket Venting may be required refer to installed local building code 2 thick styrofoam AE Floor Drain Minimum decline of 1 8 per foot 1 8 IUe lt lt gt 12 Dat 170 ion Rd WARTIME GEOTHERMAL Checked B P Approved By og Drawing Name Typical Duct and Condensate ents Geddes moje Connections Vertical Case Size Drawing Number REV SHEET 8 IMPL BY APVD BY 15 JAN 08 DATE 001583MAN 02 Page 14 01 JUN 2012 TABLE 11 Duct Sizing Guide external static of 0 20 H20 gt lt gt lt 6 5 x 6 5 8x8 8x8 8 5 8 5 8 5 8 5 9 5 x 9 5 11x11 11x11 12x 14 12x 14 15 15 15 15 16x 17 16 17 18 x 19 18 19 20 20 20 20 22 22 22 22 24 x 24 26 x 26 26 x 26 28 x 28 28 x 28 30 x 30 30 x 30 30 x 32 30 x 32 i Diameter Duct Area Rectangular Equivalents in 680 3954 4 8x22 9x19 10x17 11x15 95 154 1 8x22 9x19 10x17 11x15 1325 201 16 8x30 10x22 12x18 14x16 150 2001 16 8x30 10x22 12x18 14x16 1750 254 18 8x40 10x30 12x24 14x20 2000 254 18 8x40 10x30 12x24 14x20 2250 20 10x38 12x30 14x26 16x22 2600 20 10x38 12x30 14x26 16x22 2900 22 i12x
74. r eign object TXV frosting up Random Low Pressure trip does not occur while there Faulty compressor contacior Intermittent fan 001583MAN 02 Adjusting the TXV does not affect the superheat or the suction pres sure Points pitted or burned Contactor sometimes sticks causing the com pressor to run without the fan trip ping the low pressure control Adjust the TXV all the way in and out a few times to loosen it Replace TXV if this does not work Replace contactor See Fan Troubleshooting section Correct the problem Page 30 01 JUN 2012 FAN TROUBLESHOOTING Possible Cause Verification Recommended Action Dirty air filter Low Airflow Fan operating on wrong Stage speed Fan not operat ing or operating intermittently 01 JUN 2012 Inspect Replace Dirty air coil Poor Ductwork Air flow selected on Tap Board 15 too low Air flow reduction is ena bled Fan Control Signal Har ness is loose Faulty Control Signal Har ness or faulty motor head Fan Control Signal Har ness and or Fan Power Harness is loose Inspect Measure delta T between supply and return ducts at the unit it in heating mode it should not be above 30 F 17 C Check selection on Air Flow Tap Board AR1 and are connected with a dry contact Verify that the connector is properly inserted into the fan motor Gently tug on each wire to verify it is properl
75. ra distance to borehole Extra depth of borehole Extra distance to trench 0 102 per foot Extra length of trench Extra distance in structure 01 JUN 2012 DX Line Set Interconnect Tubing Installation Modular Design R410a gt 4 2 OD Copper Basement Wall 3 8 OD 4 D Tubing e Floor Joist Lines can be bundled together after pressure testing and insulation for neatness and strength HEAT PUMP CONNECTIONS Liquid 1 Vapour 1 Liquid 2 Vapour 2 Liquid 3 Vapour 3 Liquid 4 Vapour 4 Liquid 5 The liquid lines for horizontal loops Holes should be 1 Vapour 5 must be reduced to 3 8 OD once larger than tube Liquid 6 it enters the structure Vertical loops size Fill the gap Vapour 6 are already 3 8 OD between insulation and wall with 3 8 OD expanding foam or Couplings All lines insulated with other sealant thi suitable for 250 F 1 2 OD 3 8 thick pipe insulation Couplings NOTES e Ensure the line sets are kept in order and routed to the proper ports on the heat pump 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 All joints should be soldered with 5 silver solder e Pressure test to 100PSIG and check for leaks once all connections are
76. refrigeration gauges while the unit runs Record the following after 10 minutes of runtime Suction pressure Discharge pressure Duct Return temperature Duct Supply Out temperature Duct Delta T 3 Adjust the thermostat setpoint to the desired room temperature if possible otherwise set it just low enough to allow the unit to run 1 F 0 5 C less than room temperature and let the unit run through a cycle Record the thermostat setpoint and the suction pressure when the unit shuts off Final Inspection 1 Turn the power off to the unit and plenum heater if installed and remove all test equipment 2 Install the electrical box cover and the access panel on the heat pump Install the service port caps securely to prevent refrigerant loss Install the electrical cover on the plenum heater if applicable 3 Do a final check around the heat pump and ensure the area 1 clean 4 Turn the power on to the unit and the plenum heater if installed Set the thermostat to the final settings Startup Record 1 The installer shall sign and date the Startup Record and have the homeowner sign as well The installer shall leave the Startup Record with the homeowner retain a copy for filing and send a copy to Maritime Geothermal Ltd for warranty registration 01 JUN 2012 Page 19 001583MAN 02 Startup Record DX Series Single Stage R410a Installation Site Startup Date Installer Province Check boxes unless Model asked to rec
77. 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 001583MAN 02 Page 34 01 JUN 2012 REFRIGERATION CIRCUIT DIAGRAMS DX Modular TXV REFRIGERATION CIRCUIT HEATING MODE CONDENSER o o MIT 1 gt DISTR Y TXV3 NO mF TA A COOLING TXV CV F D CV SG CV RECEIVER og E lt l 4 gt R REVERSING VALVE RV 1 K DHW bs IN SERVICE BULB 1 SERVICE TXV BULB PORT HIGH PRES COOLING SWITCH DHW LOOP OUT lt SWITCH 7 2 MAN HIGH DESUPERHEATER PRESS SW A ACTIVATION TABLE ENERGIZED RV 1 NO lt TXV BULB 4 lt COMPRESSOR ACCUMULATOR TXV BULB 5 4 D RHEAULT itcodi A HT TR GEOTHERMAL m _ i o Name DX Modular TXV Refrigeration 000195 E Circult Heating Mode 01 initial Release D RHEAULT D RHEAULT 2 2011 Size Drawing Number REV SHEET A 001576RCD 02 1 of 1 35 001583 02 REFRIGERATION CIRCUIT DIAGRAMS continued DX Modular TXV REFRIGERATION CIRCUIT COOLING MODE EVAPORATOR o 000 22 001 4 i 1000
78. require a jumper be tween auxiliary and emergency Check the thermostat manual Faulty thermostat Thermostat doesn t indicate Replace thermostat for auxiliary or emergency when it should Faulty thermostat Thermostat indicates auxiliary or Replace thermostat emergency but no 24VAC signal present across C and the auxiliary and or emergency pin at the ther mostat Faulty thermostat wiring 24VAC signal is present across C Correct wiring and the auxiliary and or emergency pin at the thermostat but no 24VAC signal is present across W2 and C at the heat pump terminal strip No 24VAC signal Plenum Heater transform Voltmeter does not show 24VAC Replace transformer from C to ground er is burned out across transformer secondary wind at the plenum ing heater control connector Plenum heater control Transformer tested OK in previous Replace control board board is faulty step No 24VAC signal Faulty wiring 24VAC present across C and Correct wiring from 1 to ground ground at the plenum heater but not at the plenum across ground of the plenum heater heater control and of the heat pump terminal strip connector Faulty wiring If previous step tested OK 24VAC is Correct wiring present across ground of the plenum heart and 1 of the heat pump termi nal strip but not across ground of the plenum heater and 1 of the ple num heater 001583MAN 02 Page 32 01 JUN 2012 PLENUM HEATER TROUBLE SH
79. rive ECM fan motor for maximum efficiency The motor features a soft start which fur ther improves efficiency by eliminating inrush current and pro vides a smooth quiet ramp up to speed The motor will main tain the programmed air flow up to the maximum external static value Refer to the APPENDIX A ECM Fan Airflow Tables The air flow can be set to four different levels by changing the position on the Air Flow board located in the electrical box The four levels are indicated in TABLE 2 The actual air flow values can be found in APPENDIX A Units are shipped with the MED position selected for nomi nal air flow The air flow can be further reduced by 15 by making a dry contact across AR and on the terminal strip 01 JUN 2012 TABLE 2 Airflow Selections 6 Nominal 6 12 This can be used for applications that have multiple zones or retrofits with undersized ductwork to help reduce air flow noise in the ductwork It is recommended that airflow reduction only be used with the High or Max air flow setting Care should be taken to ensure that the unit does not trip a safety control in heating or cooling mode if the 15 reduction is used in conjunc tion with the Med or Low air flow setting CONTROL TRANSFORMER The low voltage controls for all models are powered by a 100VA transformer with either primary and secondary fuses or a 100VA transformer with a secondary resettable breaker for cir cuit protect
80. sizing the unit to 100 of the heating design load for maximum long term efficiency with minimal supplementary heat The unit should be in stalled as per CSA 448 2 02 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 undersized installation will not be as efficient and will require expensive supplementary heat to maintain a comfortable temperature in the home and the cost savings of having a geothermal heat pump are greatly duced 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 the selected entering water tempera ture in order to provide a comfortable environment with minimal auxiliary heat 001583MAN 02 Page DUCT SYSTEMS GENERAL Ductwork layout for a heat pump will differ from traditional hot air furnace design in the number of leads and size of main trunks required Air temperature leaving the heat pump 15 normally 95 105 35 40 C m
81. ssistance is required in obtaining warranty performance write or call Maritime Geothermal Ltd e Customer Service PO 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 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
82. t will click when pressed Hi and Low LED s off HB 1 flashing but Y LED is not on or no 24VAC across Y and C of bottom right con nector Check value with capacitance meter Should match label on capacitor Compressor will hum while trying to start and then trip its overload Proceed to Operation Trouble shooting Replace control board Replace if faulty Loose or faulty wiring Faulty compressor contactor Thermal overload on compressor tripped Check all compressor wiring includ ing inside compressor electrical box Voltage on line side with contactor held closed but no voltage on one or both terminals on the load side Points pitted or burned Or 24VAC across coil but contactor will not engage Ohmmeter shows reading when placed across R and 5 terminals and infinity between C or amp S A valid resistance reading is present again after the compressor has cooled down Fix any loose connections Re place any damaged wires 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 Remove wires from compressor Ohmmeter shows infinite resistance between any two terminals Note Be sure compressor overload has had a chance to reset lf compressor is hot this may take several hours Remove wires from compressor Resistanc
83. t the next time interval record all data Adjust the TXV that is the furthest out Record the TXV Turns and In Out values Record the new position of the adjusted TXV in the appropriate P column of the next row Record the remaining TXV posi tions in their individual P columns in the next row Repeat Steps 2 and 3 until all superheat values are within 8 14 F 4 8 C 01 JUN 2012 Page 21 001583MAN 02 8 ev A AA exmod 15 5 89 06 9215 jueunsn py AXL 01 2012 22 02 001583MAN General Maintenance GENERAL MAINTENANCE SCHEDULE Air Filter 6 months Inspect for dirt Replace if necessary Inspect for pitted or burned points Replace if necessary Condensate Drain Inspect for clogs Remove and clean if necessary 01 JUN 2012 Page 23 001583MAN 02 Troubleshooting Guide The following steps are for troubleshooting the geothermal heat pump If the problem is with the domestic hot water or the plenum heater proceed to those sections at the end of the troubleshooting guide Repair procedures and reference refriger ation circuit diagrams can be found at the end of the troubleshooting guide STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 STEP 6 Verify that th
84. ter written notice to MG s factory in Petitcodiac New Brunswick of each defect function or other failure and a reasonable number of attempts by MG to correct the defect malfunction or other failure and the remedy fails of its essential purpose MG shall refund the purchase price paid to MG in exchange for the return of the sold good s Said refund shall be the maximum liability of MG THIS REMEDY IS THE SOLE AND EXCLUSIVE REMEDY OF THE BUYER OR PURCHASER AGAINST MG FOR BREACH OF CONTRACT FOR THE BREACH OF ANY WARRANTY OR FOR MG S NEGLIGENCE OR IN STRICT LIABILITY LIMITATION OF LIABILITY MG shall have no liability for any damages if MG s performance is delayed for any reason or is prevented to any extent by any event such as but not limited to any war civil unrest government restrictions or restraints strikes or work stoppages fire flood accident shortages of transportation fuel material or labour acts of God or any other reason beyond the sole control of MG MG EXPRESSLY DISCLAIMS AND EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGE IN CONTRACT FOR BREACH OF ANY EXPRESS OR IMPLIED WARRANTY OR IN TORT WHETHER FOR MG s NEGLIGENCE OR AS STRICT LIABILITY OBTAINING WARRANTY PERFORMANCE Normally the dealer or service organization who installed the products will provide warranty performance for the owner Should the linstaller be unavailable contact any MG recognized distributor dealer or service organization If a
85. th via direct contact with copper loops eliminating the need for a secondary heat exchanger and associated components Direct expansion units require less loop per ton and are more efficient than conventional ground loop systems The re duced thermal resistance between the earth and the refrigerant circuit provides better heat transfer resulting in a higher suction pressure and increased output An electrically commutated ECM fan with several speed options is standard The motor has a soft start function for im proved efficiency and reduced wear 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 For air units to achieve the greatest efficiency the heat pump should be centrally located in the home with respect to the conditioned space This design provides the utmost in economy and comfort and usually can be accomplished in harmony with the design of
86. the airflow for zone applications E Dal 170 Plantation Rd SEAN ese MARITIME GEOTHERMAL 01 JUN 2012 IMPL BY APVD BY DATE Checked B Date O Chris Geddes 27 SEP 11 47 6H4 __ Approved By ENG D Drawing Name DX H P 1S DE Schematic Diagram Size Drawing Number REV SHEET 0015638 43 001583 02 Chris_Geddes Approved By MFG ELECTRICAL DIAGRAMS HW 230 1 60 continued DX Series Electrical Box Diagram 208 230 1 60 Single Stage Scroll ECM Fan Low Voltage Wiring 24VAC Thermostat Wiring Field Use an 18 6 conductor cable to connect this T stat unit to the thermostat S a 2 Reduction Connections 24VAC Common Wiring Connections G Fan 2 m Y1 Stage 1 Heat Cool Compressor E E MAR RH 24 Hot L Trouble if available on thermostat a is W2 Stage 2 Heat Plenum Heater C gt O B W1 Not Applicable Y2 Not Applicable 1 Low 6 High 6 Med Nom Max 12 211111119 LP1LP2 Y FLOW HP1HP2 2 amp 7 6 E C F R CC 1 3 esms llle Control Board E Plenum Heat Comp Airflow Reduction Wiring Use an 18 2 conductor cable to connect Electrical Box 2 to
87. ture poke a small hole in the flex collar and insert probe in airstream 6 Duct Supply temperature poke a small hole in the flex collar and insert probe in airstream 7 Duct Delta T should be between 22 32 F 12 18 8 Compressor L1 C current black wire place meter between electrical box and compressor 4 Adjust the thermostat setpoint to the desired room temperature and let the unit run through a cycle Record the setpoint and the discharge pressure when the unit shuts off 5 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 6 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 7 Remove the electrical cover from the plenum heater Place a current clamp meter around one of the supply wires Turn on the power to the plenum heater Adjust the thermostat setpoint to 85 F 29 C Verify that the current draw increase as each stage is activated 10kW has 2 stages 15kW has 3 stages and 20kW has 4 stages Cooling Mode 1 Set the thermostat to cooling mode and adjust the setpoint to activate Stage 1 2 Monitoring the
88. ual reset high pressure control should the control board be faulty and fail to disengage the compressor It can be reset by pressing the rubber button on the end of it It is electrically located between the Y output of the control board and the com pressor contactor coil The control board see next section monitors the pressure controls and shuts the compressor off immediately for a set peri 01 JUN 2012 od of time adjustable should there be a fault The counter for the safety control in question will be increased by 1 The LED indicator for the control will flash until the control is reset as the pressures equalize in the unit The unit may restart after the timer period has expired Should the unit trip on the safety con trol again the compressor will once again shut down and the counter will be incremented by one again Each time this occurs the count is incremented until the counter reaches the max val ue default is 3 at which point a permanent lockout will occur if this occurred within a set period of time default 6 hours and the compressor cannot be started again until the control board is reset by shorting the reset pins together or turning the power off and on again The lockout count is decreased after a set period of time default 6 hours if there are no more occurrences If the control board enters permanent lockout mode there is a serious problem with the system and it must be rectified if the unit is to maintain g
89. uch cooler than that of a conventional warm furnace To compensate for this larger volumes of lower temperature air must be moved and consequently duct sizing must be able to accommodate the greater air flow without creating a high static pressure or high velocity at the floor diffusers A duct system capable of supplying the required air flow is of utmost importance Maritime Geothermal Ltd recommends that the static pressure be kept below 0 2 inches of water total In some instances the number of floor diffusers will actually double when compared to the number that would be used for a hot air oil fired furnace Refer to TABLE 11 at the end of this section 1 Generally allow 100 cfm for each floor grill 2 All leads to the grills should be 6 in diameter 28sq in each 3 The main hot air trunks should be at least 75 of the square surface area of leads being fed at any given point 4 Return air grills should have a minimum of the same total square surface area as the total of the supply grills 5 The square surface area of the return trunks should equal the square surface area of the grills being handled at any given point along the trunk Itis VERY IMPORTANT that all turns in both the supply trunks and the return trunks be made with TURNING RADII Air act like a fluid and just like water pressure drop 15 increased when air is forced to change direction rapidly around a sharp or irregular corner It is recommended that fl
90. vaporator heating mode consists of one three way valve one heating thermostatic expansion valve TXV a pair of check valves and one outdoor copper loop with one va pour and one liquid connection to the heat pump For each ad ditional ton of capacity there 1 a parallel evaporator circuit add ed to the unit In heating mode all loops are used simultaneously to cre ate a large evaporator This allows maximum heat transfer from the loop field Since each loop has it s own TXV its superheat can be individually tailored allowing each loop to obtain the same superheat even it may have different soil conditions The loop select valves default to open in heating mode and as such none of the loop select valve solenoid coils are energized In cooling mode running all loops at the same time would create far too large a condenser and the unit would have very low head pressure causing the suction pressure to fall off until the low pressure safety control was reached To circumvent this problem the direct expansion unit will begin cooling mode by using only Loop 1 Loops are selected by activating the solenoid on the loop select valve for the loop in question The remaining loops are scavenged to the suction line Using one loop greatly reduces the size of the condenser allowing the unit to operate properly As the ground tempera ture warms up rejecting the heat to the ground becomes more difficult causing the head pressure to increase
91. y inserted into the connector Measure 24VAC between White pin 3 and the following at the fan con trol signal harness insert probes in connector where wire is inserted do not unplug the connector Circulation Grey pin 15 Stage 1 Yellow pin 6 Stage 2 Yellow Black pin14 Stage 3 Violet pin 2 Verify that the connector is properly inserted into the fan motor Gently tug on each wire to verify it is properly inserted into the connector Clean The ECM fan will provide proper airflow up to 0 5 inH2o for 1 2HP motors and 0 7 2 for 1HP motors The ductwork is poorly designed or greatly undersized if the fan motor cannot provide the required airflow Select a higher setting Air flow reduction may not be fea sible with poor ductwork and or lower Air Flow selections In crease settings until unit operates properly Repair any loose connections If proper signal isn t present re place Fan Control Signal Har ness proper signal is present replace fan motor head Repair any loose connections Faulty Control Signal Har ness or Faulty motor head Fan Power Harness faulty or Faulty motor Measure 24VAC between White pin 3 and the following at the fan con trol signal harness insert probes in connector where wire is inserted do not unplug the connector Circulation Grey pin 15 Stage 1 Yellow pin 6 Stage 2 Yellow Black pin1 4 Stage 3 Violet pin 2

DX Series Manual - Nordic Geothermal Heat Pump

Contents

Download Pdf Manuals

Related Search

Related Contents