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DXS Series Manual - Nordic Geothermal Heat Pump

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1. n N O 00 M gt E 168799 L N u o EM B o 1 e 4 on Ol L Co N L TI c N DATE 12 NOV 2012 Page 39 001570MAN 03 CAPACITY RATINGS continued DXS 55 HACW P 1S x U D 9 91 4 4 1 2 1 9 9 O N 108 743 119 819 131 900 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 HU _ 5707 __ __ 813 124 335 3 148 3 02 _ 6357 559 26 667 2 957 13 0 335 3 292 3 37 _ 7813 _ 9073 J 99 37 377 3 223 14 1 335 3 558 4 08 mess J 1 14 Compressor ZPS40K4E PFV e84 86 267 11 89 267 rest 89 257 reso 94 267 reso 94 267 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 TI
2. uns aq jou snw pue s 5141 9 0 yeay MO CN CIN jV E 9 3 5 C Q S Q S 3 1 0 3 O Q 3 2 Q y Y EE pue uej deg PU pol J9JeM pejoeuuoo 182 v 4 JOY duis _ V 00l m e s 29 MOVH MH suononnsuj m 22 Q 40je n2412 JOH MI ue4 e m Ie S 5 1 2 4 110195 09 1 0 8 e213299 3 soeues sxg 001570MAN 03 CASE DET
3. J NI nO O 3 923 9 16 1 12 943 3 427 J L O 05 NI 0 Compressor ZPS40K4E PFV 001570MAN 03 Page 40 N L CO N Oi O 2 601 11 0 65 17 4 EER COPc 20 1 PSIG kPa 237 1 631 255 1 761 275 1 899 296 2 044 319 2 196 342 2 357 366 2 526 392 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 58 448 17 125 58 080 17 017 57 684 16 901 56 816 16 647 37 3Pa 0 15inH20 Ext Static DATE 12 NOV 2012 CAPACITY RATINGS continued DXS 65 HACW P 1S x U D 9 91 4 4 2 O gt 0191 5191 O N oF ses 10 12 2 15 9 4 20 6 7 25 3 9 30 ats 27 054 3 384 14 7 455 3 839 3 06 301 96 3 484 15 1 5 3 939 3 22 55 8 29 807 Fam 1l 105891 Heating Mode Nominal 5 ton Power Consumption C 70 0 21 1 991 70 0 2 100 21 1 991 70 0 2 100 21 1 991 70 0 2 100 21 1 991 70 0 2 100 21 1 991 CFM L sec 2
4. Page 6 ein eee ene ee ee re AE eee Page 7 Domestic Hot Water Connections 7 DIRECT EXPANSION UNIT OPERATION 9 ise Page 9 Page 9 SIZING AND cO deat PAGE 12 Heat PUMP SIZING Page 12 Air Handler Selection and ee eee 12 12 Systems Grill EaVOUE Page 13 Thermostat TERT D EST Page 13 Plenum Heater Page 13 13 DUCE SIZING i aa 15 DIRECT EXPANSION LOOP CONNECTION AND CHARGING 0 0 12222 PAGE 16 Line Set Interconnect TUDING oues cusa icing un Ska euo Eun s rex use xS Page 16 Pipe
5. peeds ue4 9 Je pueH 94 ueJ ejejedo oj 1585 4l OVAPZ Je pueH 4 UOWWOD OVATZ 2 WNUS q 99 oj oj BU 04 14 JOSUUOD Jojonpuoo 4 8 ue esf SIU Jojonpuoo ue esf yun si 129uuoo Jojonpuoo 9 esf MoT bn 0 19914402 7 1 N 21 Jo peejsul JeuuojsueJd uo 802 eui 04 6 01 0c eJnsu3 YAMOd 09 1 802 ALON JoyeoJg 9215 10 esn4 UIN 09 1 022 802 2 09 dung 39j9eju93 SNOILO3NNOO OVASLLI 0 C 80C DATE 12 NOV 2012 Page 44 puc jeeH __ AGL L1 des umi 200 eu DT MIM N ES 10869 4 2 JO0j96ejuO2 Jossaidwoy 21 16 808119
6. amp CO PSIG 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 F 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 1 700 102 2 802 39 0 27 7 15 4 29 9 16 6 32 2 IUE AS 45 951 13 464 49 519 14 509 53 304 15 618 37 3Pa 0 15inH20 Ext Static DXS 55 HACW P 1S Cooling Mode R410a 60 Hz Power Consumption BTU Hr Watts a c watts Watts 61 16 828 36 807 53 635 e 61 N A O O 0 L O O J J J J 52 340_ 15 336 51 516 15 094 50 636_ 99 4 655 10 181 14 836 _ 13 593 132987 no oO
7. F connects to terminal of the air handler all fans Fan F Fy2 Fw2 Fan Fv2 e connects to the W2 terminal of Relay Relay Relay the air handler multi speed fan only x ___ e connects to the Y2 terminal of the air handler multi speed fan only ris 6 5 Petitcodiac NB MARITIME GEOTHERMAL m Jd pprove y ate TL Je Seis DXS HAC P 1S Schematic Diagram Initial Release c GEDDES c GEDDES 04 SEP 11 Size Drawing Number REV SHEET A d B ECO IMPL BY APVD BY DATE A 001568SCH 01 1 of 1 DATE 12 NOV 2012 Page 43 001570MAN 03 Drawing Name DUE 811695100 w 24556 133 5 AJH JequinN BuiweJq 099 SL d 2VH SX __ ewen bumed Sie gt 9180 11 00 Ames 33 22 JON SJojouJ peeds ui LAWS O Jo 94 pue 4 esf 31ON ZM peeds ZA Je pueH 16180894 uo 1 004 1 4 dnyoeg ZM JeipueH JOH OVAPZ e qeorddy JON LAA 40sseJduio5 LA
8. e H 0 9 1 367 O 16 0 4 68 14 7 Oi c roj o AITO 1 463 O O C1 C1 O oj E 1 565 2 13 4 O O 1 673 L i N 1 787 al lt 2 22 001570MAN 03 DATE 12 NOV 2012 CAPACITY RATINGS continued DXS 45 HACW P 1S Heating Mode Nominal 3 ton R410a 60 Hz Power Consumption BTU Hr Amps W W PSIG F BTU Hr Watts kPa C Watts 10 17 610 1 93 05 97 70 0 1 400 86 7 16 7 24 840 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 372 211 661 31 1 10 0 7 803 20 9 1 102 70 0 1 400 892 19 2 28 502 67 6092 2259 389 21 1 661 318 10 7 8 351 25 9 5 105 70 0 1 400 90 5 205 30 479 39 6585 2357 406 214 661 32 5 11 4 8 930 30 25 716 2 220 9 8 352 107 70 0 1 400 92 8 22 8 33 907 1 1 1 535 2424 41 7 21 1 661 33 8 12 7 9 935 3 2 900 361 109 70 0 1 400 94 4 24 4 36 297 1 743 7 8 175 2492 42 8 21 1 661 34 13 6 10 635 30 025 2 372 377 112
9. GEOTHERMAL un 092557 Installation and Service Manual DXS Series Single Stage R410a Model Sizes 25 65 Direct Expansion Heat Pumps Split Systems dur 4 ENERGY STAR 5 5 Water Source HP AHSI AHRI ASHRAE 15013256 1 G U S Maritime Geothermal Ltd Email info nordicghp com P O Box 2555 Web www nordicghp com Petitcodiac N B 42 6 4 Document Number 001570MAN 03 Ph 506 756 8135 ECO 000205 DATE 12 NOV 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 _ TT TF T S L xx Series
10. 20 10x38 12x30 14x26 16x22 2600 20 10x38 12x30 14x26 16x22 2900 22 i12x36 14x30 16x26 18x23 3400 22 12 36 14x30 16x26 18x23 3600 452 24 x38 16x32 18x28 20x25 4800 452 24 14 38 16x32 18x28 20x25 5250 5 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 32x38 34 36 35x35 80x45 34 40 36x38 37x37 DATE 12 NOV 2012 Page 15 gt lt gt lt j N Return Air Airflow Diameter in A 001570MAN 03 Direct Expansion Loop Connection amp Charging LINE SET INTERCONNECT TUBING AND AIR HANDLER 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 t
11. Low or no refrigerant charge Entering air temperature and air flow are good but suction is low Check static refrigeration pressure of unit for very low value Locate the leak and repair it Spray nine a sniffer and dye are common methods of locating a leak Leaking cooling check valve Faulty NO solenoid valve coil Faulty NO solenoid valve Faulty cooling TXV by pass check valve leaking Faulty compressor not pumping 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 A click can be heard when the coil is energized Unused loops stay cold instead of gradually warming to ambient Compressor frosts up Also low discharge pressure Switch to cooling mode Unit oper ates correctly Pressures change only slightly from static values when compressor is started Identify the check valve Try switching modes a few times Re place if problem continues Replace solenoid if faulty Replace NO valve Identify the check valve Try switching modes a few times Re place if problem continues Replace compressor Compressor See Low Suction frosting up Pressure in this section frosting TXV stuck almost closed Adjusting the does not affec
12. 11 2 gt M 8 D L MI FAN i 4 CV 000 010 CV TXV2 COOLING DISTR TIU CV CV TXVA4 CV 1 ug F D CV SG i lt 4 WAY LOW TEL REVERSING SWITCH 7 VALVE H RV 1 gt DHW IN SERVICE PORT TXV BULB 5 SERVICE PORT HIGH PRES SWITCH DHW LOOP OUT E SNATCH TXV BULB 4 MAN HIGH DESUPERHEATER PRESS SW A ACTIVATION TABLE 1 ITEM ENERGIZED RV 1 YES YES TXV BULB 2 COMPRESSOR ACCUMULATOR TXV BULB 1 D RHEAULT Petitcodiac NB By Drawing DXS Modular TXV Refrigeration 11 11 02 Circuit Cooling Mode E Size Drawing Number REV SHEET IMPL BY APVD BY DATE A 001735RCD 01 1 of 1 001570MAN 03 DATE 12 NOV 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 REFRIGEHANT 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 STADAHD CAPACITY RATINGS The tables below depict the results of standard capacity rating tests according
13. Page 16 SINVER LING SOUS Page 16 PIESSUFC e w Page 16 Ihe Earn nz er soar 085 Page 16 Charging the SYSE succus quei me D case NK TONO NON DS DN CEA UNE Page 16 STARTUP PROCEDURE c Page 18 INSDOCUOMN Page 18 m M Page 19 Record t 20 HEATING ADJUSTMENT Seu scree sein bern cca 21 incwctectencnesncnsenseencencd Page 21 Healing 1XV Adjustment 22 GENERAL 2 5 255 52225 opes nnna PAGE 23 TROUBLESHOOTING GUIDE misses a 24 34
14. 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 is 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 of time The 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 T XV 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
15. 32 2 95 35 0 100 37 8 105 40 6 110 43 3 179 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 m 2 21 2 on N P I Co N TI DATE 12 NOV 2012 001570MAN 03 ELECTRICAL TABLES Table 18 Heat Pump Electrical Information Table 19 Heat Pump Electrical Information 230 1 60 208 3 60 Amps Amps 0 L Amps 16 0 19 8 3 196 243 40 253 314 50 293 134 303 376 60 _ 15 3 83 17 4 110 Table 21 Heat Pump Electrical Information 380 3 50 Max Fuse 5 ath Amps 2 3 9 27 1 1 w 10 0 5 67 Oo 001570MAN 03 Page 42 DATE 12 NOV 2012 ELECTRICAL DIAGRAMS HACW 230 7 60 continued Gnd DXS Series Schematic Diagram 208 230 1 60 Scroll 115 115 UE 5 T1 irculator Pump gy 5 2 Compressor Hot Water Limit Contactor NOTE For 208VAC move the red wire Relay Start Cap connected to the 240 terminal of the tran
16. 21 Table 16 Standard Capacity Ratings Heating 60HZ enne nennen Page 37 Table 17 Standard Capacity Ratings Cooling 60 2 0 0 0 2 Page 37 Table 18 Heat Pump Electrical Information 230 1 60 0 0 22222 Page 42 Table 19 Heat Pump Electrical Information 208 3 60 Page 42 Table 20 Heat Pump Electrical Information 220 1 50 Page 42 Table 21 Heat Pump Electrical Information 380 3 50 4 42 DRAWINGS 000970PDG Single Unit Connection to DHW Pre Heat Tank Brass FPT Page 8 000301CDG NCB Laptop Communication Cable Page 11 000644CDG Typical DXS Split System Duct and Condensate Connections Page 14 000769PDG DX Line Set Interconnect Tubing Installation 410 Page 17 000384RCD 5 Series Refrigeration Circuit Diagram Heating Mode Page 35 000385RCD DXS HAC Series Refrigeration Circuit Diagram Cooling Mode Page 36 001568SCH DXS HAC P 1S Schematic Diagram 2 0 01 11
17. 70 0 1 400 96 1 26 1 38 733 gt D ad B iS i gt 4 Qo Co Co O O O gt e e O N to 2597 444 21 1 661 35 6 14 5 11 349 392 115 70 0 1 400 978 27 8 41 289 2705 461 21 1 661 36 5 15 4 12 098 37 3Pa 0 15inH20 Ext Static DXS 45 HACW P 1S Cooling Mode R410a 60 Hz 6 I N D N Power Consumption E Watts EER BTU Hr Watts Watts COPc kPa Watts 15 075 31 525 46 600 1 650 253 237 52 879 4417 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 1 895 212 275 90 51 401 1 899 32 2 15 060 29 414 43 480 2 026 19 6 296 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 14 493 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 Uses 1 400 61 9 97 257 66 9 9 267 66 9 97 267 66 24 I N
18. Breaker Tons kW A A CONDENSATE DRAIN The air handler will have a condensate drain that allows the condensate which forms during the air conditioning cycle to be removed from the unit The drain should be connected as per the instruction provided with the air handler as well as 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 installation is done properly Drawing 000644CDG shows a typical installation 001570MAN 03 Typical DXS Series Split System Duct and Condensate Connections Radii Hot Air Out Supply Ensure Air Handler size and air flow match the DXS unit specifications Hot Air Out Supply Ducts should be sized as per the Duct Sizing Cold Air In table in this manual Return Flexible Duct Collar minimum 12 above plenum heater elements if installed Optional Electric Plenum Heater GENERIC AIR HANDLER Flexible Duct Collar Air filter Filter Rack Accoustic insulation may be used inside the ducts near the unit to dampen any air noise that may be present En
19. Revision DXS d d Direct Expansion 01 02 etc Nominal Size Extra Loop 25 2 45 3 Ton Yes 55 4 65 5 available Compressor Stages in 575 3 60 S 1 Stage Functions Voltage Code H Heating 1 230 1 60 AC Active Cooling 2 208 3 60 W Domestic Hot Water 6 220 1 50 7 380 3 50 Refrigerant P R410a 001570MAN 03 Page 2 DATE 12 NOV 2012 APPLICATION TABLE VOLTAGE STAGES HACW HACW 02 02 02 02 02 02 02 HACW This manual applies only to the models and revisions listed in this table E DATE 12 NOV 2012 Page 3 001570MAN 03 Table of Contents TABLES DIAGRAMS amp DRAWINGS 2 2 2 5 INSTALLATION INFORMATION wee MU XE US 6 M 6 2 Page 6 imas etes cia ee 6 El cirical ConBeclloliS OE Page 6 Requirements Page 6 gt 6 Control Transformer usus
20. 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 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 001570MAN 03 Page 32 DATE 12 NOV 2012 PLENUM HEATER TROUBLE SHOOTING Fault ___ Possible Cause Verification Recommended Action 24VAC signal Faul
21. 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 T XV 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 At 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 DATE 12 NOV 2012 Page 21 001570MAN 03 lee Kao exmod 69 62 9215 seuies sxa 1ueunsn py AXL DATE 12 NOV 2012 Page 22 03 001570MAN General Maintenance GENERAL MAINTENANCE SCHEDULE Air Fi
22. locations OPTIONAL must install both DHW IN 1 2 FPT HEAT PUMP CONNECTIONS 1 2 Union is Boiler Drain DHW OUT 1 2 FPT 1 2 Ball Valve 1 2 COPPER LINES Insulate with 5 8 pipe insulation Ball Valve NOTE Refer to the heat pump labels for connection locations Domestic COLD IN from well OPTIONAL must install both 125pisg 1 2 PRV Valve DHW IN 1 2 FPT REV IMPL BY APVD BY DATE 001570MAN 03 1 2 COPPER LINES 1 Insulate with 5 8 pipe insulation 1 2 Check Valve 1 Insulated Domestic Hot Water Pre Heat Tank 1 2 Check Valve Chris Geddes 10 MAR 09 D Chris Geddes 10 MAR 09 Chris Geddes 10 MAR 09 Page 8 Insulated Domestic Hot Water Pre Heat Tank Ball Valve Ball Valve Domestic HOT OUT to house or mixing valve 125psig Pressure Relief Valve 125psig _ Pressure Relief Valve 120 140 50 60 Electric Or Gas Insulated Domestic Hot Water Tank Domestic HOT OUT to house or mixing valve 125psig Pressure Relief Valve Pressure Relief alve 120 140 50 60 Electric or Gas Insulated Domestic Hot Water Tank 170 Plantation Rd Petitcodiac NB E4Z 6H4 GEOTHERMAL Drawing Name Single Unit Connection to DHW Pre Heat Tank Brass FPT Size Drawing Nu
23. must High pres lockout counter reduce time be unlocked by command U before using command C to change Low pres lock ignore counter 3times _ system settings The list of settings for command C is shown in High pres lock ignore counter 3 5 2 t id that the settings be left at the Reset mode 1 and loop memory time 2 weeks Maximum mode to be allowed 202 Ignorelowpres for 5min TABLE 6 RS232 Port Configuration Data Bits 8 Stop Bits 1 Ignore low pres for TABLE 7 Control Board Commands Help displays the list of commands H U Lock unlock the COP watchdog Display loop history Display system configuration eange system setings ee Ue T C System runtimes Advance system time by 59 minutes 27 Resetloop timers to zero 001570MAN 03 Page 10 DATE 12 NOV 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 in an old computer Connect the wires as shown in the diagram above 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
24. 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 C m CRLOWYBG 92 Default if no i ps Lap Top 9 NCB Adaptor Cable Serial Port Microprocessor Loop m High Low Heart T Pres Pres Beat O O I 6 Female Male LIE TER 170 Pianiaon MS 264865 Petitcodiac NB Checked B Dat GEOTHERMAL IRAM _ MARITIME Approved ENG bsis Drawing Name 11 11 Chris Geddes NCB Lap Top Communication Cable Approved By MFG A 000301CDG 01 1 0f 1 A d B ECO IMPL BY APVD BY DATE DATE 12 NOV 2012 Page 11 001570MAN 03 Sizing and Ductwork HEAT PUMP SIZING TABLE 9 depicts a rough guideline as to the size of home each heat pump size can handle direct expansion installations TABLE 9 Heat Pump Size vs Heated Area 00 75 1 400 2 000 THE TABLE ABOVE IS FOR INFORMATION ONLY IT SHOULD BE USED TO SELECT A UNIT SIZE 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 numbe
25. place any damaged wires Replace contactor Thermal overload on compressor tripped Ohmmeter shows reading when placed across R and S terminals and infinity between C amp or C amp S A valid resistance reading is present again after the compressor has cooled down Proceed to Operation Trouble shooting to determine the cause of the thermal overload trip Burned out motor open winding Remove wires from compressor Ohmmeter shows infinite resistance between any two terminals Note Be sure compressor overload has had a chance to reset If compressor is hot this may take several hours Replace the compressor Burned out motor shorted windings Remove wires from compressor Resistance between any two termi nals is below the specified value Replace the compressor Motor shorted to ground Hemove wires from compressor Check for infinite resistance be tween each terminal and ground Seized compressor due to Compressor attempts to start but locked or damaged trips its internal overload after a few mechanism seconds Run capacitor already verified Compressor starts hard otart capacitor faulty Single phase only Check with capacitance meter Check for black residue around blowout hole on top of capacitor Potential Relay faulty Single phase only Replace with new one and verify compressor starts properly If any terminal to ground is not infinite replace t
26. 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 low pressure control LEDs flash once per second when a 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 001570MAN 03 The high pressure low pressure and loop switch are 5VDC TABLE 8 Control Board Default Settings signals The low pressure control connects to L and L on the control board The high pressure control connects to H and H loop switch connects to S and S All other inputs and out Blower wait time after comp start uts are 24VAC 3 Blower run time after comp stops When the thermostat calls for heat the compressor will Blower run time after aux heat off start Stage 1 as will the fan after a short delay adjustable Aux heat on t
27. time Connect the brown wire with the blue insulated terminal to L1 of the compressor contactor fuse terminal for 575 3 60 units Ensure the power is 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 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 domestic 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 001570MAN 03 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 1 2 1 2 FPT MES gt 1 2 Boiler Valve Drain NOTE Refer to the heat pump labels for connection
28. to mon suction line is warm compres not be pumping sor is running hot Heating TXV s adjusted Verify superheat It should be be Adjust T XV to obtain 8 14 F too far open tween 8 14 F 3 8 Superheat 3 8 C superheat will be low if TXV s are open too far One or more heating Adjusting the TXV does not affect Attempt to adjust the TXV all the TXV s stuck too far the superheat of the loop or the suc way out and all the way a few open tion pressure Low super heat low to loosen it Replace if discharge pressure this does not work Faulty cooling check valve Also low discharge pressure Switch Identify the check valve Try leaking to cooling mode Unit operates cor switching modes a few times rectly when loop is in use Loop Replace if problem continues lines get cold when loop not in use instead of warming to ambient com pressor frosts up Faulty heating TXV Low superheat and discharge pres Try switching modes a few times bypass check valve sure Switch to cooling mode Unit Replace check valve if problem Leaking operates properly on all loops continues Compressor See Low Suction frosting up Pressure in this section Heating TXV stuck almost closed Adjusting the T XV does not affect Attempt to adjust the TXV all the frosting up heavi or partially blocked by for the superheat or the suction pres way out and all the way in a few ly eign object sure ti
29. when silver soldering Ensure that no water enters any of the ports or tubing 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 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 is 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 14 shows the typical cha
30. 100 2073 310 2134 319 2196 35 6 98 36 7 100 37 8 102 38 9 104 40 0 2259 CO CO 2324 88 0 31 1 89 4 31 9 90 9 32 7 92 5 33 6 95 3 35 2 R410a 60 Hz oF se oF im 18 0 10 0 19 4 10 8 20 9 11 6 22 5 12 5 25 3 14 1 BTU Hr Watts 40 155 11 765 43 251 12 672 46 560 13 642 50 092 14 677 54 151 15 866 Ces 1 Compressor ZPS51K4E PFV D N 106 41 1 108 42 2 110 43 3 70 0 2 100 21 1 991 70 0 2 100 21 1 991 70 0 2 100 101 4 31 4 67 060 21 1 991 38 5 17 4 19 649 49 7Pa 0 20inH20 Ext Static 97 2 36 2 99 2 37 4 27 2 15 1 29 2 16 2 58 198 17 052 62 498 18 312 108 35 743 1 7 119 40 819 4 4 5 2 45 45 45 3 45 45 45 DXS 65 HACW P 1S Cooling Mode Power Consumption EER COPc 19 4 PSIG kPa 237 1 631 255 1 761 275 1 899 296 2 044 319 2 196 342 2 357 366 2 526 BTU Hr Watts 6 548 22 428 76 364 22 375 76 137 22 308 75 869 22 229 74 592 21 855 74 254 21 756 73 886 21 648 392 115 73 493 2 705 46 1 21 533 49 7 0 20inH20 Ext Static Watts Wars Wats Watts e00 75 267 267 os 89 267 L sec 2 100 991 2 100 991 2 100 991 2 100 991 2 100 991 gt 3 055 CO m 18 0 5 27 16 7 4 89 15 5 29 4 90
31. 11 43 001569ELB DXS HAC P 1S Electrical Box Diagram 4 Page 44 DATE 12 NOV 2012 Page 5 001570MAN 03 Installation Information UNIT DESCRIPTION The DXS Series unit is a high efficiency single stage split direct expansion DX heat pump with R410a refrigerant It ex tracts and rejects heat from the earth via direct contact with cop per loops eliminating the need for a secondary heat exchanger and associated components It must be connected to an air handler to complete the system 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 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 arr
32. 5 STEP 5 If HI or LOW pressure LED s 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 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 breaker 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 D No display on Blown Primary 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 24VAC is not present across and Correct the wiring pump and the
33. 9 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 37 3Pa 0 15inH20 Ext Static DXS 25 HACW P 1S Cooling Mode R410a 60 Hz 8818 1 412 4 930 LI LI LI LI LI Oi B O1 2228 P gt N Te 99 9 7 0 4 5 2 2292 342 2357 5 PN Power Consumption 21 1 PSIG kPa 237 1 631 255 1 761 275 1 899 296 2 044 319 2 196 342 2 357 366 2 526 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 01520 Ext Static Waits Watts 6776 16703 23 569 8639 16 453 23 092 1885 4673 658 5 6227 15435 21 661 Usec i m i m i i Compressor ZPS20K4E PFV N 9 s 1 099 O 5 1 185 O N e e Co 29 4 90 32 2 95 35 0 100 37 8 105 40 6 110 43 3 E 1 274 4 O N 6
34. AILS DOMESTIC HOT WATER IN 5 8 Q D DOMESTIC HOT WATER OUT 5 8 36 55 COMPRESSOR REVERSING VALVE DX VAPOUR LINES 1 5 1 2 O D DX LIQUID LINES 1 5 3 8 O D ACCESS 5 ELECTRICAL BOX SOLENOID VALVE SIGHT GLASS FILTER DRYER Left Side View DATE 12 NOV 2012 Page 45 THERMOSTAT WIRE CONNECTION ACCESS ACCUMULATOR 3 WAY VALVES Back View 001570MAN 03 001570MAN 03 Page 46 DATE 12 NOV 2012 THIS PAGE INTENTIONALLY LEFT BLANK DATE 12 NOV 2012 Page 47 001570MAN 03 _________________________1 LIMITED EXPRESS WARRANTY Iit is expressly understood that unless a statement is specifically identified as a warranty statements made by Maritime Geothermal Ltd a corporation registered in New Brunswick Canada or its representatives relating to MG s products whether oral written or contained in any sales literature catalogue or agreement are not express warranties and do not form a part of the basis of the bargain but are merely MG s opinion or commendation of MG s products EXCEPT AS SPECIFICALLY SET FORTH HEREIN THERE IS NO EXPRESS WARRANTY AS TO ANY OF MG S PRODUCTS MG MAKES NO WARRANTY AGAINST LATENT DEFECTS MG MAKES NO WARRANTY OF MERCHANTABILITY OF THE GOODS OR OF THE FITNESS OF THE GOODS FOR ANY PARTICULAR PURPOSE LIMITED EXPRESS RESIDENTIAL WARRANTY PARTS MG warrants its Residential Class produ
35. D stops flashing replace con Must be a signal present 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 DATE 12 NOV 2012 Page 25 001570MAN 03 COMPRESSOR TROUBLESHOOTING Faut Possible Cause Recommended Action Manual High pressure control tripped Faulty control board Press the button on the control it will click when pressed Hi and Low LED s off HB is flashing but Y LED is not on or no 24 across Y and C of bottom right con nector Compressor will not start Faulty run capacitor Single phase only Check value with capacitance me ter Should match label on capaci tor Compressor will hum while try ing to start and then trip its overload Faulty compressor contactor Voltage on line side with contactor held closed but no voltage on one or both terminals on the load side Points pitted or burned Or 24VAC across coil but contactor will not engage Proceed to Operation Trouble shooting Replace control board Replace if faulty Loose or faulty wiring Check all compressor wiring includ Fix any loose connections Re ing inside compressor electrical box
36. LE 11 shows the number of grills available per heat pump size 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 2596 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 TABLE 11 Heat Pump Size vs Hot Air Grills 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 It 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 is very little air 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 propane etc it is recommended that
37. Retrigeration Circuit otia roro oie R P E PLAN ACA UNE Page 35 MODEL SPECIFIC INFORMATION 5225522225 Seo eser EE arant ee Dacus eee PAGE 37 Standard Capacity 5 Page 37 Capacity 38 Electrical cux TUO I 42 Electrical Diabrams HACW 230 1 60 43 Case ree 45 WARRANTY INFORMATION PAGE 48 001570MAN 03 Page 4 DATE 12 NOV 2012 Tables Diagrams and Drawings TABLES Table 1 Control Signal Description Page 6 Table 2 Air Handler Control iiis esae FoU Ev vues dete KEEN NU we Page 6 Table 3 Control Board Fault Codes ss oie Ioue Eee o oup va adno En Fa Page 7 Table 4 C
38. 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 is unable to bring the home tempera ture up quickly enough eliminating any discomfort to the home owner DATE 12 NOV 2012 Page 13 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 TABLE 12 shows the recommended size plenum heater as well as the wire size and breaker size needed to provide power to the plenum heater TABLE 12 Plenum Heater Sizing Size Size Current
39. ains 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 replace the filter drier STEP 7 Charge the unit a final time Unit should now be clea
40. all Holes should be 1 larger than tube size Fill the gap between insulation and wall with expanding foam or other sealant suitable for 250 F 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 5976 silver solder e Pressure test to 100PSIG and check for leaks once all connections are 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 Drawing Name Chis Geddes 05 000141 C GEDDES C GEDDES Chris_Geddes ECO IMPL BY APVD BY DATE DATE 12 NOV 2012 Page 17 GEOTHERMAL 170 Plantation Rd Petitcodiac NB E4Z 6H4 DX Line Set Interconnect Tubing Installation R410a 05 AUG 08 Approved By Size Drawing Number REV SHEET A B A 000769PDG 001570MAN 03 Startup Procedure The following steps describe how to perform the startup procedure of the geothermal heat pump The DXS Series Two Stage R410a Startup Record located in this manual is used in conjunction with this startup procedure to provide a detailed record of the installati
41. aragraph for more information
42. auge and Plenum Heater size Low voltage connections are correct and securely fastened Unit Charge Refrigerant charge before power is turned on STARTUP DATA Preparation Voltage across L1 and L2 L1 and L3 L2 and L3 Vi 51 52 v3 53 v4 54 V6 S6 F C 15 minutes 20 minutes 30 minutes Average m JJ m 3 m 2 C o lt 5 m Cooling Mode Suction Pressure Discharge Pressure psig kPa Thermostat setpoint and suction pressure at cycle end C psig kPa A total of three copies are required one for the homeowner one for the installer and on to be sent to Maritime Geothermal Ltd 001570MAN 03 Page 20 DATE 12 NOV 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 15 de scribes what each of the columns in the Heating TXV record sheet table represents TABLE 15 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
43. 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 expires CONTROL BOARD HACW only All heating cooling direct expansion units contain a con trol board that monitors the thermostat signals safety controls and loop pressures It controls the operation of the compressor fan and auxiliary emergency heat It 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 5 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 5 Cooling Loop Configuration 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
44. ctrical cover on the plenum heater if applicable 3 Do a final check around the heat pump and ensure the area is 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 DATE 12 NOV 2012 Page 19 001570MAN 03 Startup Record DXS Series Size 25 65 Two Stage R410a Installation Site Startup Date Installer Province Check boxes unless Model asked to record data Circle data units Serial Homeowner Phone Check boxes unless asked to record data Circle data units Country Homeowner Name PRE START INSPECTION Ductwork is completed dampers diverters are adjusted Registers are open and clear of objects Air filter and end cap are installed in air handler Condensate Drain is connected properly vented and free of debris Plenum heater is securely fastened if applicable Domestic Hot All shut off valves are open Water Lines are full and purged 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 g
45. cts 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 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 8 Sealed refrigerant circuit components of MG Units which components only include the compressor refrigerant to air water heat exchangers reversing valve body and refrigerant metering device for ten 10 years from the Warranty Inception Date as defined below 4 Other accessories and parts built or sold by MG when installed and purchased with MG Units for five 5 years from the date of shipment from MG b Other accessories when purchased separately for 1 year from the date of shipment from MG The Warranty Inception Date shall be the date of original unit installation as per the date on the installation Startup Record or six 6 months from date of unit shipment from MG whichever comes first To make a claim under this warranty parts must be returned to MG in Petitcodiac New Brunswick freight prepaid no later than ninety 90 days after the date of the failure of the part If MG determines the part to be de
46. d be insulated with 3 8 thick closed cell pipe insulation to prevent condensation and dripping onto floors or walls during the heating season 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 soldering and pressure testing is complete Ensure that all individual pieces of pipe insulation are glued to each other so there are no air 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 001570MAN 03 Page 16 If necessary a wet rag can be wrapped around the each of the ports to prevent melting the grommet
47. e selected entering water tempera ture in order to provide a comfortable environment with minimal auxiliary heat AIR HANDLER SELECTION AND SIZING The air handler selected should match the size of the DXS unit as close as possible for heating and cooling loads The air handler should be able to provide the air flow required within 1096 by the DXS unit in order to maximize system efficiency See TABLE 10 for the air flow values per unit size The air handler must have its own cooling TXV as well as a bypass around the TXV for heating mode in order to func tion properly with the DXS unit 001570MAN 03 Page It is recommended that an air handler with an A coil setup be selected lt is important that the air coil total volume be close to the volume shown in TABLE 10 to minimize refrigerant charge adjustment If a match is unavailable then select a higher air coil volume unit Undersized air coils can cause problems with refrigerant back up in the coils reducing output and efficiency TABLE 10 Air Flow and Air Coil Volume Air Coil Volume Size tons 1500 ___ 1900 901 353 575 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 is normally 95 105 F 35 40 much cooler than that of a conventional warm air fur
48. eed Fan not operat Faulty air handler wiring Verify the wiring using the air han Repair any loose connections ing or operating dler instruction manual intermittently Faulty fan motor Inspect as per air handler instruction Replace motor if faulty manual DATE 12 NOV 2012 Page 31 001570MAN 03 PLENUM HEATER TROUBLE SHOOTING Faut PossibeCause Verfication 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 is 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 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 require a jumper be tween auxiliary and emergency Check the thermostat manual Faulty thermostat
49. et 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 and Stage 2 2 Monitoring the 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 ie 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 ele
50. fective and within MG s Limited Express Residential Warranty MG shall when such part has been either replaced or repaired return such to a factory recognized distributor dealer or service organization freight prepaid The warranty on any part repaired or replaced under warranty expires at the end of the original warranty period LIMITED EXPRESS RESIDENTIAL WARRANTY LABOUR This Limited Express Residential Labour Warranty shall cover the labour incurred by MG authorized service personnel in connection with the installation of a new or repaired warranty part that is covered by this Limited Express Residential Warranty only to the extent specifically set forth in the current labour allowance schedule A provided by MG s Warranty Department and only as follows 1 MG Units for two 2 years from the Warranty Inception Date 2 Thermostats auxiliary electric heaters and geothermal pump modules built or sold by MG when installed with MG Units for two 2 years from the Warranty Inception Date 3 Sealed refrigerant circuit components of MG Units which components only include the compressor refrigerant to air water heat exchangers reversing valve body and refrigerant metering device for five 5 years from the Warranty Inception Date Labour costs are not covered by this Limited Express Residential Warranty to the extent they exceed the amount allowed under said allowance schedule they are not specifically provided for in said allowance schedu
51. ged Feel each end of the filter drier it Replace filter drier should be the same temperature there is a temperature difference then itis plugged Also causes low suc tion pressure Undersized Air Handler air High sub cooling low delta T across Verify size of air coil Attempt to Coil air coil reduce charge and verify in both modes Replace with proper size air handler Unit is overcharged High sub cooling low delta T across Remove 1 2lb of refrigerant at a air coil time and verify that the discharge pressure reduces Surging Heating TXV s adjusted Verify superheat It should be be Adjust T XV to obtain 8 14 F Discharge too far closed tween 8 14 F 3 8 Superheat will 8 8 C superheat Pressure be high if TXV is closed too far Low Suction Heating TXV s adjusted Adjusting the TXV does not affect the Attempt to adjust the TXV all the Pressure too far closed superheat or the suction pressure way out and all the way in a few TXV may be frosting up times to loosen it Replace TXV if this does not work One or more heating Adjusting the TXV does not affect the Attempt to adjust the TXV all the TXV s stuck too far superheat or the suction pressure way out and all the way in a few closed times to loosen it Replace TXV if this does not work Faulty Normally Open so click can be heard when the coil is Replace NO valve lenoid valve stuck energized but the valve is cold in closed stead of
52. he DXS unit and the air handler remain separated For multi speed or ECM fan motors all of the signals may be required For single speed fan motors only Fa is required Refer to the electrical box diagram and schematic for more infor mation The air handler power supply is separate from the DXS unit power supply and should be on it s own breaker TABLE 2 Air Handler Control Signals oenn 24 Fan low speed for air circulation Fan high speed Fan auxiliary emergency heat speed Use Fa only if the air handler has a single speed fan 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 protection 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 DATE 12 NOV 2012 Page 6 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 a
53. he compressor Attempt to rock compressor free If normal operation cannot be established replace compressor Replace if faulty Remove black residue in electri cal box if any Replace if faulty Compressor is tight due to damaged mechanism Compressor attempts to start but trips its internal overload after a few seconds Run capacitor has been verified already Attempt to rock compressor free If normal operation cannot be established replace compres SOr 001570MAN 03 Page 26 DATE 12 NOV 2012 OPERATION TROUBLESHOOTING HEATING MODE Heating TXV s adjusted Verify superheat It should be be Adjust to obtain 8 14 F too far closed tween 8 14 F 3 8 Superheat will 3 8 superheat be high if TXV s are closed too far One or more heating Adjusting the TXV does not affect the Attempt to adjust the TXV all the TXV s stuck too far superheat or the suction pressure way out and all the way in a few closed times to loosen it Replace TXV if this does not work Faulty Normally Open so Aclick can be heard when the coil is Replace NO valve lenoid valve stuck energized but the valve is cold in closed stead of warm Faulty cooling TXV Temperature drop can be felt across Try switching modes a few times bypass check valve the cooling TXV Unit operates Replace check valve if problem blocked properly in cooling mode continues Filter drier plug
54. he connections to the heat pump and associated controls The connections to the heat pump MUST CON FORM TO LOCAL CODES 001570MAN 03 THERMOSTAT REQUIREMENTS The DXS 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 51 Stage 1 com pressor S2 electric auxiliary heating only One can be pur chased 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 24 2 G Fan low speed for air circulation Heat Pump Stage 1 Compressor Stage 1 Ru L 24VAC Hot Fault 24VAC when fault condition Emergency Heat Not Applicable DEM Plenum Heater dry contact 1020 Plenum Heater dry contact NOTE Some models are not available in two stage at the pre sent time see Electrical Tables The Y2 signal is not used for these units AIR HANDLER CONNECTIONS The DXS unit is the master and is connected to the ther mostat It must provide control signals to the slave air handler as required for proper system operation The available connec tions are shown in TABLE 2 These are all dry contact connec tions meaning the control transformers for t
55. he 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 pressure 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 000769CDG for more information on how to connect to the heat pump Piping between the DXS unit and the air handler consists of two lines a 7 8 OD vapour line and a 3 8 OD liquid line Run the piping as required between each unit and connect to each unit with copper couplings 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 a 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 as well as the piping between the DXS unit and the air handler shoul
56. ime after comp on The unit will run until the thermostat is satisfied and the unit shuts off the fan will continue to run for an adjustable period Comp off if low lockout HEAT or a set period of time elapses default 40 minutes Should the Comp off if low lockout COOL set period elapse the auxiliary heat Stage 2 will be engaged to Comp off if high lockout HEAT help the unit on cold days when the load is too large for the unit Comp off if high lockout COOL When the thermostat calls for cooling the compressor will Comp off time between heat amp cool start Stage 1 as will the fan after a short delay adjustable Comp delay since being off 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 During operation the control board will cycle through the loops Loop pressure testing wait time as required Soaker start after comp on time Soaker hose run time maintenance Soaker hose run time emergency The control board has an RS 232 communications port on board A simple program such as Hyper Terminal and an adapt er cable can be used to communicate with the control board System check interval Drawing 000301CDG shows how to build the communications Low pres lockout counter reduce time cable The port settings are shown in TABLE 6 The com mands available are listed in TABLE 7 Note that the COP
57. in 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 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 4 TABLE 4 Cooling Mode Loop Sequences DATE 12 NOV 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
58. 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 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 temperature 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 g
59. ives OPTIMUM PLACEMENT The placement of the unit has negligible effects on the operation of the system The unit can be placed wherever it can most easily be connected to 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 ELECTRICAL CONNECTIONS The heat pump has a concentric 1 093 0 875 knockout for power supply connection to the electrical box There is also a 0 875 knockout There are two 1 2 openings with plastic grommets grommet hole is 3 8 in the upper section of the electrical box one for the thermostat connections and one for the optional plenum heater connections A schematic diagram and electrical box layout diagram ELB can be found inside the electrical box cover of the unit 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 t
60. le they are not the result of work performed by MG authorized service personnel they are incurred in connection with a part not covered by this Limited Express Residential Warranty or they are incurred more than the time periods set forth in this paragraph after the Warranty Inception Date This warranty does not cover and does not apply to 1 Air filters fuses refrigerant fluids oil Products relocated after initial installation Any portion or component of any system that is not supplied by MG regardless of the cause of the failure of such portion or component Products on which the unit identification tags or labels have been removed or defaced Products on 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 Products supplied by others Products which have been operated in a manner contrary to MG s printed instructions Products which have insufficient performance as a result of improper system design or improper applicatio
61. lood 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 installer be unavailable contact any MG recognized distributor dealer or service organization If assistance is required in obtaining warranty performance write or call Maritime Geothermal Ltd e Customer Service PO Box 2555 Petitcodiac New Brunswick E4Z 6H4 506 756 8135 or e mail to info nordicghp com NOTE Some states or Canadian provinces do not allow limitations on how long an implied warranty lasts or the limitation or exclusions of consequential or incidental damages so the foregoing exclusions and limitations may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state and from Canadian province to Canadian province Please refer to the MG Installation Installation and Service Manual for operating and maintenance instructions An extended warranty option is also available Please contact Maritime Geothermal Ltd the contact information in the previous p
62. lter 6 months or as recom Inspect for dirt Replace if necessary In Air Handler mended in air handler manual Inspect for pitted or burned points Replace if necessary Condensate Drain 1 year or as recom In Air Handler mended in air handler manual Inspect for clogs Remove and clean if necessary DATE 12 NOV 2012 Page 23 001570MAN 03 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 Verify that the display is present on the thermostat If it is not proceed to POWER SUPPLY TROUBLE SHOOTING otherwise proceed to STEP 2 STEP 2 Remove the door and electrical box cover and check to see if 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 STEP 3 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 STEP 4 If the HI or LOW LEDs flash and the compressor does not attempt to start proceed to the SAFETY CONTROL TROUBLESHOOTING section otherwise proceed to STEP
63. mber REV SHEET DATE 12 NOV 2012 Direct Expansion Unit Operation REFRIGERATION Direct expansion operation is essentially the same as any other heat pump The main difference is 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 evaporator 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 is 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 HACW only 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 pres sure to fall off until the low pressure safety control was reached To circumvent this problem the direct expansion unit will beg
64. mes to loosen it Replace TXV if this does not work Random high Intermittent fan See Fan Troubleshooting section Correct the problem pressure trip does not occur while on site Random manual Faulty compressor contac Points pitted or burned Contactor Replace contactor high pressure sometimes sticks causing the com trip does not pressor to run without the fan trip occur while on ping the high pressure control site 001570MAN 03 Page 28 DATE 12 NOV 2012 Heating instead of cooling High Discharge Pressure High Pressure control trips High Pressure control and man ual high pressure control trips very fast Loop changes occur too fre quently DATE 12 NOV 2012 OPERATION TROUBLESHOOTING COOLING MODE Recommended Action Thermostat not set up properly Faulty reversing valve so lenoid coil Faulty reversing valve Faulty heating TXV bypass check valve blocked Faulty Loop Pressure switch Faulty Loop Pressure switch Input Faulty reclaim valve sole noid Faulty reclaim valve Faulty control board out put L1 to L5 Unit overcharged Verify that there is 24VAC across O B W1 and C of the terminal strip when calling for cooling 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 s
65. n installation or use of MG s products Electricity or fuel or any increases or unrealized savings in same for any reason whatsoever cept for the limited labour allowance coverage set forth above MG is not responsible for The costs of fluids refrigerant or system components supplied by others or associated labour to repair or replace the same which is incurred as a result of a defective part covered by MG s Limited Residential Warranty 2 The costs of labour refrigerant materials or service incurred in diagnosis and removal of the defective part or in obtaining and replacing the new or repaired part 3 Transportation costs of 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 WY 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 amp DEALER INSTALLER AND RECIEVED BY MG LIMITED WITHIN 90 DAYS OF START UP Limitation This Limited Express Residential Warranty is given in lieu of all othe
66. n and repeated future burn outs can be avoided 001570MAN 03 Page 34 DATE 12 NOV 2012 REFHIGERATION CIRCUIT DIAGHAMS continued DXS Modular TXV REFRIGERATION CIRCUIT HEATING MODE AIR HANDLER BULB CONDENSER 1888 COOLING 20011 4 e E 20 TXV1 9 DISTR COOLING a TXV TXV3 a TXV4 CV A TXV5 CV F D CV SG RECEIVER E 4 WAY REVERSING 2 VALVE RV 1 K H DHW lt IN SERVICE PERT TXV BULB 5 SERVICE PORT PRES SWITCH lt DHW io OUT SWITCH TXV BULB 4 MAN HIGH DESUPERHEATER PRESS SW lt A ACTIVATION TABLE Lv TE ITEM ENERGIZED RV 1 NO 1 TXV BULB 2 COMPRESSOR ACCUMULATOR TXV BULB 4 L 170 Plantation Rd D RHEAULT MARITIME GEOTHERMAL um _ 2 SS SS SS Drawing DXS Modular TXV Refrigeration 1 LI n Circuit Heating Mode 01 000205 D RHEAULT D RHEAULT 12 Nov 2012 Daa Drawing Number REV SHEET ECO IMPLBY APVD BY DATE 001734RCD 01 1 of 1 DATE 12 NOV 2012 Page 35 001570MAN 03 REFRIGERATION CIRCUIT DIAGRAMS continued DXS Modular TXV REFRIGERATION CIRCUIT COOLING MODE AIR HANDLER P BULB EVAPORATOR COOLING
67. nace 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 L s 472 1200 661 4342 91 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 13 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 7596 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 Air acts like a fluid and just like water pressure drop is increased when air is forced to change direction rapidly around a sharp or irregular corner It is recommended that flexible collar
68. nd will shut the compressor down if the refrigerant evaporating pressure becomes too low 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 Each of the controls are auto reset controls There is also a manual reset high pressure control HACW only should the control board be faulty and fail to disengage the compressor 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 compressor contactor coil HW units contain a control board that monitors the safety controls and operates the compressor accordingly Refer to APPENDIX A for control board specifications The low pressure control is connected to LP1 and LP2 The high pressure control is connected to HP1 and HP2 The HW control board has an on board LED and a FAULT pin with a 24VAC output An external indicator or relay can be connected across the FAULT pin and ground if external signaling is desired Should a fault occur the LED will flash the code of the fault condition while the safety control in question is open The codes are shown in TABLE 3 The control board will lock out the compressor for five minutes when a fault occurs Three retries per fault condition are allowed within a 60 minute period If the fault condition occurs a fourth time the control board will perma
69. nently lock out the compressor and energize the FAULT pin This can only be reset by powering down the unit The LED will flash the fault code until the unit is reset TABLE 3 Control Board Fault Codes LED HACW re Code HI red High Pressure Low Pressure LOW green Fow 3 If the control board enters permanent lockout mode there is a serious problem with the system and it must be rectified if the unit is to maintain good service HACW units contain a control board that monitors the safety controls and operates the compressor accordingly The HACW control board also controls loop switching in cooling mode Refer to the Direct Expansion section for more infor mation The HACW control board monitors the pressure controls and shuts the compressor off immediately for a set period of time adjustable should there be a fault Refer to TABLE 3 for DATE 12 NOV 2012 Page 7 the LED indicators The counter for the safety control in ques tion 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 control 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 value default is 3 at which point a permanent lockou
70. nes for lines Acid treat the domestic hot heat exchanger obstruction water coil Faulty DHW cutout failed Check contact operation Should Replace DHW cutout if faulty open close at 120 F and open at 140 F Heat pump not running Note the amount of time the heat Temporarily turn up the tank enough hours to make pump runs in any given hour thermostats until colder weather sufficient hot water creates longer run cycles Water is too hot Faulty DHW cutout failed Check contact operation Should Replace DHW cutout if faulty closed close at 120 F and open at 140 F Thermostat on hot water Visually inspect the setting Readjust the setting to 120 F tank set too high Should 140 F if required by local 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 orifice that varies its area inversely with pressure so that a constant flow is maintained 2 E d Multimeter Voltmeter Digital In line Flowmeter DATE 12 NOV 2012 Page 33 001570MAN 03 REPAIR PROCEDUHES PUMP DOWN PROCEDURE Connect the refrigerant recovery unit to the heat pump service ports via a refrigeration charging manifold and to a recovery tank as pe
71. on 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 and clear of any objects that would restrict the airflow Verify that a new air filter is installed and the cover is secured Verify the condensate drain is connected properly vented and free of debris If a plenum heater has been installed verify that it is securely fastened to the ductwork Line Sets Inside structure Loops and Air Handler Connections 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
72. ooling Mode Loop Sequences nennen nnns 9 Table 5 Cooling Loop Configuration Page 9 Table 6 HS232 Port Configuration eigen EE nos Page 10 Table 7 Control Board Commands Page 10 Table 8 Control Board Default Settings Page 10 Table 9 Heat Pump Size vs Heated Area Page 12 Table 10 Air Flow and Air Coil Volume sens 12 Table 11 Heat Pump Size vs Hot Air Grills sooo opere aie Dex Page 13 Table 12 Plenum Healer SIZING 13 Table 13 Duct SINO 422525 Page 15 Table T4 DXS Charge Chart cops auae uS a CERRO Page 16 Table 15 Heating TXV Adjustment Record Column Descriptions 2 Page
73. r hose Increase loop size 001570MAN 03 OPERATION TROUBLESHOOTING COOLING MODE Possible Cause Recommended Action High Suction Pressure may appear to not be pumping Cooling TXV adjusted too far open Verify superheat It should be be tween 8 12 F 3 6 Superheat will be low if TXV is open too far Adjust T XV to obtain 8 12 F 3 6 superheat stuck open Leaking reversing valve Adjusting the TXV does not affect the superheat or the suction pres sure Low super heat and dis charge pressure Reversing valve is the same tem perature on both ends of body common suction line is warm com pressor is running hot Attempt to adjust the T XV all the way out and all the way in a few times to loosen it Replace TXV if this does not work Replace reversing valve Leaking reclaim valve Low Suction Air Flow Pressure Cooling TXV stuck almost closed or partially blocked by foreign object 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 Adjusting the TXV does not affect the superheat or the suction pres sure T XV may be frosting up Replace reclaim valve Correct the problem Attempt to adjust the all the way out and all the way in a few times to loosen it Replace TXV if this does not work
74. r of windows The Heated Area is the area of the main level The tables ac count for a basement the same size as the heated area MARITME GEOTHERMAL LTD HIGHLY RECOMMENDS THAT A PROPER HEAT LOSS GAN ANALYSIS BE PER FORMEDE BY A PROFESSIONAL INSTALLER WITH CSA APPROVED SOFTWARE BEFORE SELECTING THE SIZE OF UNIT REQUIRED FOR THE APPLICATION For heating dominant areas we recommend sizing the unit to 10096 of the heating design load for maximum long term efficiency with minimal supplementary heat The unit should be in stalled as per CSA 448 2 02 There are many factors to consider when sizing the heat pump Some of these factors include the number of levels the size of the windows the orientation of the home attached gar age bonus rooms walk in basement coldest outdoor tempera ture etc The heat loss program will take all of these factors into consideration in its calculations An undersized installation will 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 re 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 at th
75. r 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 the vacuum pump and open the charging manifold valves Vacuum until the vacuum gauge rem
76. r warranties If not withstanding the disclaimers contained herein it is determined that other warranties exist any such express warranty including without imitation any express warranties or any implied warranties of fitness for particular purpose and merchantability shall be limited to the duration of the Limited Express Residential Warranty LIMITATION OF REMEDIES In the event of a breach of the Limited Express Residential Warranty MG will only be obligated at MG s option to repair the failed part or unit or to furnish a new or rebuilt part or unit in exchange for the part or unit which has failed If after written notice to MG s factory in Petitcodiac New Brunswick of each defect mal function or other failure and a reasonable number of attempts by MG to correct the defect malfunction or other failure and the remedy fails of its essential purpose MG shall refund the purchase price paid to MG in exchange for the return of the sold good s Said refund shall be the maximum liability of MG THIS REMEDY IS THE SOLE AND EXCLUSIVE REMEDY OF THE BUYER OR PURCHASER AGAINST MG FOR BREACH OF CONTRACT FOR THE BREACH OF ANY WARRANTY OR FOR MG S NEGLIGENCE OR IN STRICT LIABILITY LIMITATION OF LIABILITY MG shall have no liability for any damages if MG s performance is delayed for any reason or is prevented to any extent by any event such as but not limited to any war civil unrest government restrictions or restraints strikes or work stoppages fire f
77. rge per unit size This allows for e 2Oftof distance 40ft of pipe interconnect tubing from the unit to the wall e 20ft of distance from the wall to the borehole trench e standard loops 100ft borehole or 150ft trench e 20ft of distance to the air handler Additional refrigerant is required as per TABLE 14 if the installation exceeds these parameters TABLE 14 DXS Charge Chart R410a Size tons 7 3 9 1 Extra loop borehole Extra loop trench Extra distance to borehole Extra depth of borehole Extra distance to trench Extra length of trench Extra distance in structure Extra distance to air handler 0 10z per foot DATE 12 NOV 2012 DX Line Set Interconnect Tubing Installation R410a Floor Joist Lines can be bundled together after pressure testing and insulation for neatness and strength 3 8 OD 3 8 OD Couplings Copper Tubing HEAT PUMP CONNECTIONS 1 2 OD j C Tubing Liquid 1 Liquid 2 Liquid 3 Liquid 4 Liquid 5 MM Vapour 2 The liquid lines for horizontal loops Vapour 3 must be reduced to 3 8 OD once it enters the structure Vertical loops Vapour 4 be c are already 3 8 OD Vapour 5 Na OD All lines insulated with Couplings 3 8 thick pipe insulation NOTES e Ensure the line sets are kept in order and routed to the proper ports on the heat pump Basement W
78. rmostat of the thermostat Faulty Thermostat 24VAC is present across C and Replace thermostat Ru of the thermostat but thermo stat has no display 001570MAN 03 Page 24 DATE 12 NOV 2012 THERMOSTAT TROUBLESHOOTING Fault Possible Cause Verification Recommended Action No Y1 signal to Incorrect thermostat set Thermostat does not indicate a 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 No 24VAC between Stage 1 and C Replace thermostat of the thermostat when a call is indi cated on 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 LE
79. s 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 000644CDG shows a typical in stallation 12 DATE 12 NOV 2012 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 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 The total number of supply grills available is based on the heat pump nominal airflow TAB
80. sformer to the 208 terminal NOTE To temporarily disconnect the DHW circulator pump remove the brown wire with the NOTE In case of short or overload rectify th bl d the black butt KR LL cx uu e TEE olol insulated terminal marked A from the bottom 51 right terminal of the compressor relay T1 x Re Connections 42 OMS White Black Stripe C 24VAC 2 Compressor Contactor Coil High Pres Manual Reset R410a 650psig Y1 R22 410 80 oom p e R407c 450psig T stat Ea Wiring L 3Reversing Valve coil W2 8 72224 Liquid line NO solenoid coil O B W1 e a 5 PN Soaker Hose 5 Solenoid Coil F 3 2 aw NOTE S There may be 3 4 or O 5 solenoid valves for TO cooling changeover Plenum E on the Heater model Wiring 1 Loop Pres Switch High Pres R410a 480 5 0 ys R410a 565psig Plenum E elay Air F M AIR HANDLER PLENUM G HEATER OPERATION Handler amp 1 provides a set of dry Wiring e T 25 ae m contacts for operating plenum heater FY1 T connects to the 24VAC hot wire of the air handler Fw2 1 50003
81. sure there is no insulation within 12 of the plenum heater if installed Condensate Drain Trapping and venting may be required refer to air handler instructions and local building codes Floor Drain 2 thick DXS UNIT styrofoam WM 119 Insulate the copper lines with 3 8 thick pipe insulation a Minimum decline of 1 8 per foot 18 12 2 thick styrofoam l lL LL Y GEOTHERMAL MARITIME Ot LT LLL Drawing Typical DXS Series Split System Geddes robes Duct and Condensate Connections p REV SHEET EV A 001570MAN 03 Page 14 DATE 12 NOV 2012 TABLE 13 Duct Sizing Guide external static of 0 20 2 gt lt gt lt 6 5 x 6 5 8x8 8x8 8 5 x 8 5 8 5 x 8 5 9 5 x 9 5 11 x 11 11 x 11 12 x 14 12 x 14 15 x 15 15 x 15 16 x 17 16 x 17 18 x 19 18 x 19 20 x 20 20 x 20 22 x 22 22 x 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 8 22 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
82. t Attempt to adjust the TXV all the or partially blocked by for superheat or the suction pres way out and all the way in a few sure times to loosen it Replace TXV if this does not work eign object 001570MAN 03 Page 30 DATE 12 NOV 2012 OPERATION TROUBLESHOOTING COOLING MODE Possible Cause Recommended Action Random Low Faulty compressor Points pitted or burned Contactor Replace contactor Pressure trip contactor sometimes sticks causing the com does not occur pressor to run without the fan trip while there ping the low pressure control Intermittent fan See Fan Troubleshooting section Correct the problem FAN TROUBLESHOOTING AIR HANDLER Fault ___ Possible Cause Verification Recommended Action Low Airflow Dirty air filter Inspect Replace Dirty air coil Inspect Clean Poor Ductwork Measure delta T between supply The ECM fan will provide proper and return ducts at the unit it in airflow up to 0 5 inH2o for 1 2HP heating mode it should not be motors and 0 7 inH2o for 1HP above 30 F 17 C motors The ductwork is poorly designed or greatly undersized if the fan motor cannot provide the required airflow Air flow selected on air Check selection on air handler Select a higher setting handler is too low Fan operating Incorrect connections to Refer to air handler instruction man Correct the connections wrong Stage air handler ual for proper connections sp
83. t 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 good service DOMESTIC HOT WATER CONNECTIONS 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 THE DESUPERHEATER TEMPERATURES COULD REACH 200F SHOULD THE DHW CUTOUT SWITCH FAIL POTENTIALLY RUPTURING PEX PIPING WARNING USE ONLY COPPER LINES TO CONNECT Ensure the tank is filled with water and under pressure before activating the heat pump Slightly loosen the boiler drain on the DHW Out pipe to allow air to escape from the system before the unit is started This step will make certain that the domestic hot water circulator in the unit is flooded with water when it is started CAUTION the domestic hot water pump is water lu N bricated damage will occur to the pump if it is run dry for even a short period of
84. 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 AMATTER 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 The 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 2 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
85. 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 air handler 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 and size of the plenum heater if installed 4 Verify that the control connections to the thermostat air handler 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 001570MAN 03 Page 18 DATE 12 NOV 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
86. to ARI 870 2005 Table 16 Standard Capacity Ratings Heating 60Hz EAT 70 F 21 1 VAPOUR LINE 32 0 Input Capacity Watts BTU Hr 52 360 91 399 156 Table 17 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 DATE 12 NOV 2012 Page 37 001570MAN 03 CAPACITY HATINGS DXS 25 HACW P 1S 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 C was 10 8 983 1 184 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 e A O N O o 5 5 O1 Co 14 6 a L 5 7 15 7 O1 O 59 12 25 3 9 30 5 9 6 0 O1 2044 305 2104 314 35 0 97 36 1 99 21 1 472 293 N 4 545 70 0 21 1 70 0 1 000 472 1 000 86 9 30 5 88 2 16 9 1 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 3
87. ty 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 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 Fault ___ Possible Cause Verification Recommended Action Insufficient hot Thermostat on hot water Visually inspect the setting Readjust the setting to 120 F water tank set too low 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 em Blockage or restriction Check water flow and power to Remove obstruction in water the water line or hot water pump Check water li
88. warm May actually draw a vacuum Filter drier plugged Feel each end of the filter drier it Replace filter drier should be the same temperature If there is a temperature difference then it is plugged Also causes low suc tion pressure Low refrigerant charge Check static refrigeration pressure of Locate the leak and repair it the unit for a very low value Low Spray nine a sniffer and dye are discharge pressure when running common methods of locating a leak DATE 12 NOV 2012 Page 27 001570MAN 03 OPERATION TROUBLESHOOTING HEATING MODE ND REL Low Suction Faulty compressor not Pressures change only slightly from Replace compressor Pressure pumping static values when compressor is continued started Loop piping interchanged Affected TXV s do not seem to oper Pump the unit down and swap ie Loop 1 connected be properly Switch to cooling the interchanged lines tween Vapour 1 and mode and verify all liquid line tem Liquid 2 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 Loop field too small Charge is good superheats are Increase loop size good vapor line temperatures are low High Suction Leaking reversing valve Reversing valve is the same temper Replace reversing valve Pressure ature on both ends of body com may appear
89. witch A click can be heard when the coil 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 Temperature drop can be felt across the cooling TXV Unit oper ates properly in cooling mode Loop LED does not come on around 480PSIG Shorting S and S causes the LED to come on 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 Head pressure quickly rises and loop switch value is reached very quickly Correct thermostat setup Change to a different thermostat Replace solenoid if faulty Replace reversing valve Try switching modes a few times Replace check valve if problem continues Replace loop pressure switch Replace the control board Replace reclaim solenoid coil Replace the reclaim valve Replace the control board Remove refrigerant 1 2 pound at a time until loop switching returns to normal Loop field saturated Loop field too small Head pressure rises quickly in two loop mode Head pressure rises quickly in two loop mode Page 29 Install soake

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