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Hvac CVH8 Service Manual

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

TABLE OF CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
REFRIGERANT PIPING LENGTH LIMITATIONS . . . . . . . . . . . . 3
LONG LINE APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Aluminum Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unit Electrical Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MAJOR COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Check Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FAULT CODES / DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . 13
37, 48, 49 and 60). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
MENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
COMPRESSOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . 31
WIRING DIAGRAMS - *VA9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
WIRING DIAGRAMS - *VH8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
REFRIGERATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Brazing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Service Valves and Pumpdown . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Pumpdown & Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Suction Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Thermostatic Expansion Valve (TXV) . . . . . . . . . . . . . . . . . . . . 38
Accumulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
REFRIGERATION SYSTEM REPAIR. . . . . . . . . . . . . . . . . . . . . . 39
Leak Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Coil Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or
use can cause explosion, fire, electrical shock, or other conditions which
may cause death, personal injury, or property damage. Consult a
qualified installer, service agency, or your distributor or branch for
information or assistance. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this product.
Refer to the individual instructions packaged with the kits or accessories
when installing.
Follow all safety codes. Wear 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 included in literature and attached to the unit.
Consult local building codes and current editions of the National
Electrical Code (NEC) NFPA 70. In Canada, refer to current editions of
the Canadian electrical code CSA 22.1.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Recognize safety information. This is the safety-alert symbol
you see this symbol on the unit and in instructions or manuals, be alert to
the potential for personal injury.
Understand these signal words; DANGER, WARNING, and CAUTION.
These words are used with the safety-alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury or
death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices which
may result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
!
EXPLOSION HAZARD
Failure to follow this warning could result in
death, serious personal injury, and/or property
damage.
Never use air or gases containing oxygen for
leak
compressors. Pressurized mixtures of air or
gases containing oxygen can lead to an
explosion.
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing and gloves when handling parts.
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury or
equipment damage.
R-410A systems operate at higher pressures than standard R-22
systems. Do not use R-22 service equipment or components on R-410A
equipment. Ensure service equipment is rated for R-410A.
1
WARNING
testing
or
operating
CAUTION
WARNING
. When
refrigerant

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  • Page 1: Table Of Contents

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL CVH8, HVH8, TVH8, VA9, HVA9, TVA9 APPLICATION GUIDELINE & SERVICE MANUAL TABLE OF CONTENTS Recognize safety information. This is the safety–alert symbol . When SAFETY CONSIDERATIONS ......1 you see this symbol on the unit and in instructions or manuals, be alert to REFRIGERANT PIPING LENGTH LIMITATIONS .
  • Page 2 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 1 – OUTDOOR UNIT MODEL NUMBER IDENTIFICATION GUIDE Digit Position: 5, 6 Example Part Number: * = Brand V = Variable Speed KEY CHARACTERISTIC A = Air Conditioner...

  • Page 3: Refrigerant Piping Length Limitations

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL REFRIGERANT PIPING LENGTH LIMITATIONS Maximum Line Lengths: The maximum allowable total equivalent length varies depending on the vertical separation. See the tables below for allowable lengths depending on whether the outdoor unit is on the same level, above or below the outdoor unit.

  • Page 4: Aluminum Wire

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL MAJOR COMPONENTS Aluminum Wire Application Operational Control Board (AOC) CAUTION UNIT OPERATION AND SAFETY HAZARD Failure to follow this caution may result in equipment damage or improper operation. Aluminum wire may be used in the branch circuit (such as the circuit between the main and unit disconnect), but only copper wire may be used between the unit disconnect and the unit.
  • Page 5 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Inverter Outdoor Coil Thermistor (OCT) The inverter is located inside the control box. This is an air-cooled The outdoor coil thermistor is a 10Kohm resistor used for multiple device that communicates with the control board and drives the system operations.

  • Page 6: Communication And Status Function Lights

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Suction Thermistor (OST) Time Delays Suction Thermistor is used for assisting in EXV control and must be The unit time delays include: secured on the suction tube and aligned longitudinally to the vertical •...

  • Page 7: Check Charge

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL For standard refrigerant line lengths (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 and allow system to operate for 25 minutes to stabilize before declaring a properly charged system.
  • Page 8 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 5 – Required Charge Adjustment for Indoor Coil Model - AC Furnace Coil or Fan Coil Model EA*4X24 EHD4X24 EHD4X30 F(V,C)M4X24 EA*4X30 EN(A,D)4X30 ENH4X36 F(V,C)M4X36 A200330 EA*4X36 +.50 Fig.
  • Page 9 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL A200130 A200126 Fig. 19 – Charging in Cooling Mode CVA9, HVA9, TVA948 Fig. 15 – Charging in Cooling Mode CVA9, HVA9, TVA924 A200127 A200131 Fig. 16 – Charging in Cooling Mode CVA9, HVA9, TVA925 Fig.
  • Page 10 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL A200334 Fig. 22 – Heating Pressure Check Chart CVH8, HVH8, TVH824 A200338 Fig. 26 – Heating Pressure Check Chart CVH8, HVH8, TVH848 A200335 Fig. 23 – Heating Pressure Check Chart CVH8, HVH8, TVH825 A200339 Fig.
  • Page 11 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 6 – Factory Supplied Model Plug Information (Continued) Table 7 – Variable Speed Compressor Resistance (winding resistance at 70°F? 20°F) CVA9, HVA9, Pins 2-3 FAST PART Pins 1-4 (R1)
  • Page 12 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL High Pressure Switch Protection The outdoor unit is equipped with high pressure switch. If the control senses the opening of a high pressure switch (open 600+/-5 psig, close 470+/-10 psig @77°F), it will respond as follows: 1.

  • Page 13: Fault Codes / Descriptions

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL FAULT CODES / DESCRIPTIONS A14022 Fig. 30 – 50K Thermistor Resistance Vs Temperature If the outdoor air or coil thermistor should fail, the control will flash the appropriate fault code (see Table 10).
  • Page 14 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION 43 Fault Codes ON, no Standby flash Normal Operation for 1, pause...
  • Page 15 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Check for line voltage approximately greater Low line voltages than180V. If voltage less than 180V and if...
  • Page 16 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Heating when Cool Check fuse on AOC control cooling is demanded...
  • Page 17 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Caused by other fault System will attempt to run again...
  • Page 18 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Cool High Load conditions Over charge: Check system charge Low Charge or Loss of...
  • Page 19 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Check system sub-cooling to determine charge status, if high remove charge using Charging Mode...
  • Page 20 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Service Valve left Cool closed (Liquid or Ensure Service Valves are open...
  • Page 21 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Check Outdoor Coil for clogging (ice or debris) and clean or de-ice if necessary; Troubleshoot Outdoor...
  • Page 22 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Sudden supply Investigate incoming voltage voltage change Restriction on fan Troubleshoot outdoor fan motor &...
  • Page 23 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Table 10 – Fault Code Actions (Continued) Flash AMBER LED Type Reset Time Mode Possible Causes Actions Code DESCRIPTION Low supply line Check supply voltage to ODU; if low contact utility VDC UNDER voltage (<...

  • Page 24: Variable Speed Drive Led Location And Description (Sizes 25, 36, 37, 48, 49 And 60)

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Variable Speed Drive LED Location and Description (Sizes 25, 36, 37, 48, 49 and 60) A14329 Table 11 – MOC LED Description (Sizes 25, 36, 37, 48, 49 AND 60)

  • Page 25: Variable Speed Drive Led Location And Description (Size 24)

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Variable Speed Drive LED Location and Description (Size 24) Table 15 – MOC LED Description (Size 24) Reference Color Status Condition Description Steady On Normal Indicates MOC powered where DC bus at 40volts or higher...

  • Page 26: Compressor Power Harness Assembly Replace

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL COMPRESSOR POWER HARNESS ASSEMBLY REPLACEMENT The following is a recommended procedure for compressor power harness replacement. Always refer to the unit product installation, start-up & service instructions for detailed procedures.
  • Page 27 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL 9. With using a slot screwdriver, lift up the on the side tab to pry the 12. Remove cover, unplug old harness, plug in new harness, verify cover off from the RTV. Be sure not to break the tab.

  • Page 28: Smartsense Assembly W/Shield Gasket Removal And Installation28

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL SmartSense Assembly w/Shield Gasket Removal Installing New Inverter: and Installation 1. Install inverter into control box. Attach (12) mounting screws. 2. Re-connect inverter ground lead. Note wire color – Green w/ Also see fig.
  • Page 29 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL A210667 Fig. 32 – Compressor and Fan Harness (Unit sizes 25, 36, 37, 48, 49 and 60) A210668 Fig. 33 – Compressor and Fan Harness (Unit size 24) Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 30 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL A210669 Fig. 34 – Wire Harness Connections (Unit sizes 25, 36, 37, 48, 49 and 60) A150638 Fig. 35 – Wire Harness Connections (Unit size 24) Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 31: Compressor Replacement

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL COMPRESSOR REPLACEMENT CAUTION The following is a recommended procedure for compressor replacement. Always refer to the unit product installation, start-up & service UNIT DAMAGE HAZARD instructions for detailed procedures.
  • Page 32 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL 12. Using caution and the appropriate lifting devices, remove compressor from the unit. 13. Scratch matching marks on stubs in old compressor. Make corresponding marks on replacement compressor. 14. Use torch to remove stubs from old compressor and install them in replacement compressor.
  • Page 33 CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL 21. Route compressor harness choke to left hand side of the top of Severe Burnout control box and push in wire tie. Pull wires tight as they enter Perform steps 1 – 22 as specified in the Replacement Procedure for control box and tighten second wire tie.

  • Page 34: Wiring Diagrams - *Va9

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL WIRING DIAGRAMS - *VA9 A160127 Fig. 36 – *VA9 WIRING DIAGRAM - Size 24 A160128 Fig. 37 – *VA9 WIRING DIAGRAM - Sizes 25, 36, 37, 48, 49, 60...

  • Page 35: Wiring Diagrams - *Vh8

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL WIRING DIAGRAMS - *VH8 A160129 Fig. 38 – *VH8 WIRING DIAGRAM - Size 24 A160130 Fig. 39 – *VH8 WIRING DIAGRAM - Sizes 25, 36, 37, 48, and 60...

  • Page 36: Refrigeration System

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL REFRIGERATION SYSTEM Brazing Refrigerant This section on brazing is not intended to teach a technician how to braze. There are books and classes which teach and refine brazing WARNING techniques.

  • Page 37: Pumpdown & Evacuation

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL The service valve cannot be field repaired; therefore, only a complete 6. A quantity of charge will remain in isolated section of system valve or valve stem and service-port caps are available for replacement.

  • Page 38: Liquid Line Filter Drier

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL 4. Use slip couplings to install new valve with stubs back into system. CAUTION Even if stubs are long, wrap valve with a wet rag to prevent overheating. UNIT DAMAGE HAZARD 5.

  • Page 39: Accumulator

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Accumulator WARNING The accumulator is specifically designed to operate with R-410A R22 respectfully; use only factory-authorized components. Under some ELECTRICAL SHOCK HAZARD light load conditions on indoor coils, liquid refrigerant is present in suction gas returning to compressor.

  • Page 40: Coil Removal

    CVH8, HVH8, TVH8, VA9, HVA9, TVA9: APPLICATION GUIDELINE & SERVICE MANUAL Coil Removal Coils are easy to remove if required for compressor removal, or to replace coil. 1. Shut off all power to unit. 2. Recover refrigerant from system through service valves.

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