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Hvac CVH8, Service Manual

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CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

8

A200328

Fig. 9 – Charging in Cooling Mode CVH8, HVH8, TVH824

A200329

Fig. 10 – Charging in Cooling Mode CVH8, HVH8, TVH825

A200330

Fig. 11 – Charging in Cooling Mode CVH8, HVH8, TVH836

A200331

Fig. 12 – Charging in Cooling Mode CVH8, HVH8, TVH837

A200332

Fig. 13 – Charging in Cooling Mode CVH8, HVH8, TVH848

A200333

Fig. 14 – Charging in Cooling Mode CVH8, HVH8, TVH860

Table 5 – Required Charge Adjustment for Indoor Coil Model - AC

Furnace Coil

or Fan Coil

Model

24

25

36

37

48

49

60

EA*4X24

-

-

/

/

/

/

/

EHD4X24

-

-

/

/

/

/

/

EHD4X30

-

-

/

/

/

/

/

F(V,C)M4X24

/

-

-

/

/

/

/

EA*4X30

-

-

/

/

/

/

/

EN(A,D)4X30

-

-

/

/

/

/

/

ENH4X36

-

-

-

-

/

/

/

F(V,C)M4X36

/

-

-

-

/

/

/

EA*4X36

-

+.50

-

-

/

/

/

END4X42

+.50

+.50

-

+.75

/

/

/

EA*4X42

+.50

+.50

-

+.75

/

/

/

EHD4X36

+.50

+.50

-

+.75

/

/

/

EHD4X42

+.50

+.50 +.75

+.75

/

/

/

EN(A,D)4X31

+.50 +1.25 +.75

+.75

/

/

/

EN*4X48

+.50 +1.25 +.75

+.75

-

-

/

EHD4X48

+.63 +1.25 +.75 +1.00

-

-

/

EN(A,D)4X37

+.63 +1.25 +.75 +1.00

-

-

/

EN(A,D)4X43

+.63 +1.25 +.75 +1.00

-

-

/

EA*4X48

/

/

+.75 +1.00

-

-

/

EN*4X60

/

/

/

+1.00

-

+.13

-

EHD4X60

/

/

/

+1.00

-

+.13

-

F(V,C)M4X48

.63

+1.25 +.75 +1.00

-

+.13

/

F(V,C)M4X60

/

/

+.75 +1.00 +1.50 +.63 +1.00

 / = Comb. not allowed 
- = No charge adjust for ID

Summary of Contents for CVH8

Page 1: ...safety glasses protective clothing and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions in...

Page 2: ...7 8 9 10 11 12 Example Part Number V A 9 24 G K A 1 0 0 Brand V Variable Speed KEY CHARACTERISTIC A Air Conditioner H Heat Pump TYPE 6 16 SEER 7 17 SEER 8 18 SEER 9 19 SEER NOMINAL EFFICIENCY 24 24 00...

Page 3: ...t of comfort with the convenience of fingertip trouble shooting and diagnostic capability These units can also use a standard 2 stage or single stage thermostat for limited functionality ELECTRICAL Ta...

Page 4: ...field electrical connections for tightness This should also be done after unit has reached operating temperatures especially if aluminum conductors are used Unit Electrical Power Power wires from the...

Page 5: ...h cooling and dehumidification As the building load increases the motor will increase speed until it is at maximum speed at the maximum building load At unit start up there is a slight delay and thrus...

Page 6: ...ommunication The green LED will be turned off when using a standard 2 stage non communicating heat pump thermostat Amber Status Light Amber colored STATUS light indicates operation and error status Se...

Page 7: ...80ft 24 4 m or less allow system to operate in cooling mode at least 25 minutes If conditions are favorable check system charge by subcooling method If any adjustment is necessary adjust charge slowly...

Page 8: ...n Cooling Mode CVH8 HVH8 TVH848 A200333 Fig 14 Charging in Cooling Mode CVH8 HVH8 TVH860 Table 5 Required Charge Adjustment for Indoor Coil Model AC Furnace Coil or Fan Coil Model 24 25 36 37 48 49 60...

Page 9: ...echarge refer to the unit rating plate and indoor fan coil furnace coil per Table 4 and Table 5 for additional charge needed Refrigerant charge adjustment amount for adding or removing 0 6 oz ft 17 74...

Page 10: ...tify the type and size of unit to the control On new units the model and serial numbers are inputted into the AOC board s memory at the factory If a model plug is lost or missing at initial installati...

Page 11: ...alant before the cap is reinstalled The factory RTV can be reused as long as none of it has been removed during the cap removal 8 Reinstall compressor sound blanket making sure discharge thermistor an...

Page 12: ...stage occurs suction pressure is checked at each stage in between current and demanded stage This is to prevent ramping of compressor speed too quickly and creating a low pressure situation As long as...

Page 13: ...istor comparisons are not performed during low ambient cooling or defrost operation Failed Thermistor Default Operation Factory defaults have been provided in the event of failure of outdoor air therm...

Page 14: ...d Damaged Model Plug Check model plug for corrosion or breakage replace if necessary Check Model Plug resistance per the wiring diagram Model Plug not fully engaged on board Align per the silkscreen l...

Page 15: ...ity see resistance chart to check resistance at given temperature Broken or Damaged Sensor Check harness for continuity see resistance chart to check resistance at given temperature Hardware damage to...

Page 16: ...eading to gage reading at service valve see transducer measurement chart Check system for electrical shorts and correct replace transducer Heat damage during brazing Compare transducer reading to gage...

Page 17: ...STAGE 2 WARMUP DELAY 10 Minutes Both High voltage power cycle No action 69 System Malfunction INVERTER COMPRESS OR INTERNAL FAULT Elevates to this fault code after 5 hidden occurrences of itself 15 M...

Page 18: ...ow too low or off Troubleshoot outdoor fan motor and make sure it is working Reversing Valve Bypass or Reversing Valve not energized Reversing Valve stuck halfway Ensure AOC fuse is good 24 VDC in coo...

Page 19: ...Incoming power supply voltage Check voltage versus unit rating plate for allowable range Loose or incorrect wire connections Check incoming power leads and leads to the compressor plug 79 Local COMPR...

Page 20: ...ction Cool Restriction in Circuits or Tubing Repair restriction Heat EXV Malfunction Troubleshoot EXV see guide below Heat Service Valve left closed Liquid Service Valve Ensure Liquid Service Valve is...

Page 21: ...ndoor coil or filter for restriction debris and clean if necessary Heat Furnace plus Heat pump application Furnace stuck on If not in Defrost and Furnace is running same time as heat pump troubleshoot...

Page 22: ...ent heating or high ambient cooling Over charge Check system charge Inverter damage Replace inverter 91 Local INVERTER VDC OUT OVER VOLTAGE EVENT Elevates to fault code 97 after 5 occurrences 5 Minute...

Page 23: ...rter will reduce speed to a lower stage Both Refer to fault code 99 99 System Malfunction HIGH TORQUE LOCKOUT Elevated from fault code 98 when 98 occurs at lowest stage 2 hours Cool Overcharged System...

Page 24: ...olt connection status OK between AOC and MOC Off No Power Table 12 AOC LED Descriptions Sizes 25 36 37 48 49 AND 60 Reference Color Status Description STATUS Amber Steady On AOC status standby mode Bl...

Page 25: ...Table 16 AOC LED Descriptions Size 24 Reference Color Status Condition Description STATUS Amber Steady On Normal AOC status standby mode Blinking Abnormal AOC function fault status COMM Green Steady...

Page 26: ...res securing the compressor power harness to the control box Remove compressor power harness from control box Replace wire tie with supplied wire tie do not fasten at this time The second wire tie for...

Page 27: ...pushing one side down then the other NOTE DO NOT SCRAP SEALANT A210665 13 Reinstall compressor sound blanket making sure discharge thermistor and compressor power harness are routed as they were from...

Page 28: ...and Black 8 Disconnect fan motor power harness plug 9 Disconnect reversing valve PEV plug See Figure Below 10 Disconnect high pressure switch plug 11 Disconnect EXV plug 12 Disconnect suction pressure...

Page 29: ...MANUAL Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 29 A210667 Fig 32 Compressor and Fan Harness Unit sizes 25 36 37 48 49 an...

Page 30: ...E MANUAL Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 30 A210669 Fig 34 Wire Harness Connections Unit sizes 25 36 37 48 49 an...

Page 31: ...control box Replace wire tie with one supplied do not fasten at this time The second wire tie for the choke on the compressor is supplied with new harness on the replacement compressor highlighted wi...

Page 32: ...that terminal cover remain installed during compressor installation 15 Using caution and the appropriate lifting device place replacement compressor in unit and secure with appropriate mounting hardw...

Page 33: ...icates clean system 28 Check system for normal operation If unit is a heat pump switch from heating to cooling a few times to verify component operation Severe Burnout Perform steps 1 22 as specified...

Page 34: ...VICE MANUAL Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 34 WIRING DIAGRAMS VA9 A160127 Fig 36 VA9 WIRING DIAGRAM Size 24 A16...

Page 35: ...ICE MANUAL Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 35 WIRING DIAGRAMS VH8 A160129 Fig 38 VH8 WIRING DIAGRAM Size 24 A160...

Page 36: ...still hot 2 Silver brazing alloy is used on copper to brass copper to steel or copper to copper Flux is required when using silver brazing alloy Do not use low temperature solder 3 Fluxes should be u...

Page 37: ...at completion of the procedure Attach recovery system or vacuum pump to gauge set as needed for the service procedure The service valves must be open to evacuate the unit through the line set service...

Page 38: ...ave a bleed port Therefore minimal equalization takes place after shutdown TXVs are specifically designed to operate with R 410A or R 22 refrigerant use only factory authorized TXV s Do not interchang...

Page 39: ...em Pour and measure oil quantity if any from old accumulator If more than 20 percent of oil charge is trapped in accumulator add new POE oil to compressor to make up for this loss REFRIGERATION SYSTEM...

Page 40: ...replace liquid line filter drier evacuate system and recharge with correct refrigerant quantity Coil Removal Coils are easy to remove if required for compressor removal or to replace coil 1 Shut off...

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