APPLICATION GUIDELINE & SERVICE MANUAL CVH8, HVH8, TVH8, CVA9, HVA9, TVA9 TABLE OF CONTENTS PAGE REFRIGERANT PIPING LENGTH LIMITATIONS . . . . . . . . . . . 2 MAXIMUM LINE LENGTHS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 MAXIMUM LINE LENGTHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 MAXIMUM TOTAL EQUIVALENT LENGTH . . . . . . . . . . . . . . . . 2 LONG LINE APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 GENERAL INFORMATION . . . . . .
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 OUTDOOR UNIT MODEL NUMBER IDENTIFICATION GUIDE Digit Position: Example Part Number: * = Brand 1 * 2 3 4 5, 6 7 8 9 10 11 12 V A 9 24 G K A 1 0 0 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 = 24,000 BTUH = 2 tons 25 = 24,000 BTUH = 2 tons 36 = 36,000 BTUH = 3 tons 37 = 36,000 BTUH = 3 tons 48 = 48,000 BTUH = 4 tons 49 = 48,000 BTUH = 4 tons
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 ELECTRICAL WARNING ! 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. ! CAUTION CUT HAZARD Failure to follow this caution may result in personal injury.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 MAJOR COMPONENTS ! Application Operational Control Board (AOC) CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage and/or improper operation. Do not attempt to apply line voltage directly to the compressor. This will destroy the compressor. Electronic Expansion Valve (EXV) This unit uses an electronic expansion valve for refrigerant metering in the heating mode.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 ! CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. In order to minimize the ambient influence, make sure the thermistor curved surface hugs the pipe surface and is secured tight using the wire tie fished through the original slot insulating polymer body. A14302 Fig. 2 – HP Outdoor Coil Thermistor (OCT) Attachment (On Distributor Tube) A14023 Fig.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Time Delays The unit time delays include: S 3.5 minute time delay after last cycle, initial power up, return from brown- out condition. To bypass this feature, momentarily short and release Forced Defrost pins. S At the end of every compressor ON cycle, there will be 150 seconds of PEV open period for pressure equalization followed by 15 seconds of PEV Off period before the next compressor ON cycle. This delay cannot be bypassed as it helps compressor reliability.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 CHECK CHARGE Charging Procedure: Force system to operate in high stage cooling by creating a large differential between room temperature and set point on thermostat. Use multi- meter to verify that 24 VAC is present between C, Y1 /Y2 terminals at outdoor unit. Factory charge amount is shown on unit rating plate for high stage. Target subcooling chart is provided on back of control box door see Fig. 9 - 21 for example.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Fig. 12 – Charging in Cooling Mode CVH8, HVH8, TVH837 Fig. 16 – Charging in Cooling Mode CVA9, HVA9, TVA925 Fig. 13 – Charging in Cooling Mode CVH8, HVH8, TVH848 Fig. 17 – Charging in Cooling Mode CVA9, HVA9, TVA936 Fig. 14 – Charging in Cooling Mode CVH8, HVH8, TVH860 Fig. 18 – Charging in Cooling Mode CVA9, HVA9, TVA937 Fig. 15 – Charging in Cooling Mode CVA9, HVA9, TVA924 Fig.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Fig. 20 – Charging in Cooling Mode CVA9, HVA9, TVA949 Fig. 23 – Heating Pressure Check Chart CVH8, HVH8, TVH825 Fig. 21 – Charging in Cooling Mode CVA9, HVA9, TVA960 Fig. 24 – Heating Pressure Check Chart CVH8, HVH8, TVH836 Heating Check Chart Procedure (See Fig.22 - 27) In heating mode, the required charging method is by weigh- in.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Fig. 27 – Heating Pressure Check Chart CVH8, HVH8, TVH860 TROUBLESHOOTING Systems Communication Failure If communication is lost with the wall control (WC), the green LED will go out. Check the wiring to the wall control and the indoor and outdoor units and power. Model Plug Each control board contains a model plug. The correct model plug must be installed for the system to operate properly (see Table 3).
SERVICE MANUAL ! (C,H,T)VA9 & (C,H,T)VH8 CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage and/or improper operation. Do not use Meggar for measuring the winding resistance. ! CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage and/or improper operation. To maintain water integrity of the compressor fusite terminal box, the two holes in outer ring need to be full of RTV sealant.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 THERMISTOR CURVE RESISTANCE (KOHMS) 200 150 100 50 0 0 20 40 60 80 100 120 TEMPERATURE (C) A14022 Fig. 30 – 50K Thermistor Resistance Vs Temperature Fig. 28 – Suction Pressure Transducer (SPT) Output Function Graph A12035 Temperature Thermistors Thermistors are electronic devices which sense temperature. As the temperature increases, the resistance decreases.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 A170002 Fig. 31 – Fault Code Label 421 08 5600 02 Specifications subject to change without notice.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Table 6—Fault Code Actions FLASH CODE TYPE AMBER LED DESCRIPTION RESET TIME MODE POSSIBLE CAUSES ACTIONS 43 Fault Codes ON, no flash 1, pause Standby Variable Capacity 1 (2 sec ON), longer pause (1 second OFF) 1, pause Normal Operation for communicating system Speed Limiting for communicating systems Low capacity for non- communicating High capacity for non- communicating Speed Limiting for non- communicating systems Variable Capacity (Range Cutback) 2- s
SERVICE MANUAL 48 System Malfunction LOST INVERTER COMMUNICATIONS (Elevated from fault code 33 after 3 occurrences) (C,H,T)VA9 & (C,H,T)VH8 NA Both 49 Local COMPRESSOR OVER 6 Minutes CURRENT FAULT (Elevates to fault code 95 after 5 occurrences) Both 53 Fault OUTDOOR AIR TEMP SENSOR FAULT Both 54 55 56 Fault Fault Event SUCTION TEMP SENSOR FAULT COIL TEMP SENSOR FAULT OAT- OCT THERMISTOR OUT OF RANGE NA NA NA NA Both Both Cool Both 421 08 5600 02 Loose/disconnected harness (Har
SERVICE MANUAL 57 Fault 59 Local 61 Local 63 Local 65 Local 66 67 68 16 Event Event Event SUCTION PRESSURE SENSOR FAULT (C,H,T)VA9 & (C,H,T)VH8 NA DISCHARGE TEMP 15 Minutes OUT OF RANGE EVENT (Stage down for each occurrence, elevates to fault code 74 after 5 occurrences.
SERVICE MANUAL 69 71 72 74 (C,H,T)VA9 & (C,H,T)VH8 System INVERTER/COMPRES- 15 Minutes Malfunction SOR INTERNAL FAULT (Elevates to this fault code after 5 hidden occurrences of itself) Event COMPRESSOR DROPPED OUT 6 Minutes Local SUCTION OVER 15 Minutes TEMPERATURE EVENT (elevates to fault code 82 after 3 occurrences) System DISCHARGE TEMP 2 Hours Malfunction OUT OF RANGE LOCKOUT (Elevated from fault code 59 after 5 occurrences) Cool Overcharged System Check system sub - cooling to determine ch
SERVICE MANUAL 76 77 System Malfunction Local 79 Local 82 System Malfunction FAN INVERTER LOCKOUT (Elevated from fault code 61 after 5 occurrences) MAXIMUM POWER MODE - COMP CURRENT (Temporary RPM reduction or stage lowering will result) (C,H,T)VA9 & (C,H,T)VH8 2 Hours NA COMPRESSOR/ 6 Minutes INVERTER FAULT (Elevates to fault code 88 after 5 occurrences) SUCTION OVER TEMP LOCKOUT (Elevated from fault code 72 after 3 occurrences) 4 Hours Both Overcharged System Both Compressor is operating
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Heat Heat Both Both 84 System Malfunction HIGH PRESSURE LOCKOUT FOR 4 HOURS (Elevated from fault code 31 when the stage (speed) can no longer be lowered) 4 Hours Cool Cool Cool Cool Cool Heat Heat Heat Heat Both Both Both Both Both Both Both Outdoor Airflow too low or off Check Outdoor for clogging (ice or debris) and clean or de- ice if necessary; Troubleshoot Outdoor fan motor and make sure it is working; follow Outdoor Airflow troubleshooting instr
SERVICE MANUAL 86 System FAN INVERTER CURMalfunction RENT LOCKOUT (Elevated from fault code 63 after 5 occurrences) (C,H,T)VA9 & (C,H,T)VH8 5 minutes Both Sudden supply voltage change Restriction on fan rotation / motor Intermittent harness plug connection 88 System Malfunction COMPRESSOR / INVERTER LOCKOUT (Elevated from fault code 79 after 5 occurrences) 2 Hours INVERTER VDC - OUT OVER VOLTAGE EVENT (Elevates to fault code 97 after 5 occurrences) 5 Minutes Both INVERTER VDC - OUT UNDER VOLTAGE
SERVICE MANUAL 97 System VDC OVER VOLTAGE Malfunction LOCKOUT (Elevated from fault code 91 after 5 occurrences) (C,H,T)VA9 & (C,H,T)VH8 2 Hours Both 98 Event HIGH TORQUE EVENT (Event will cause stage down and when stage is at lowest level, will elevate to fault code 99) NA Both 99 System Malfunction HIGH TORQUE LOCKOUT (Elevated from fault code 98 when 98 occurs at lowest stage) 2 hours Both Cool Heat Both Both Both Heat 421 08 5600 02 High supply line voltage (> 253 VAC) Check supply vo
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Variable Speed Drive LED Location and Description (Sizes 25, 36, 37, 48, 49 and 60) A14329 MOC LED Description (Sizes 25, 36, 37, 48, 49 AND 60) Reference Color LD1 Red LED1 Red LED3 Amber LD5 Green Reference Color STATUS Amber COMM Green Reference Color STATUS Amber COMM Green Status Steady On Off Steady On Off Steady On Off Blinking Steady On Off Description MOC powered where DC bus is 40volts or greater No power, capacitor voltage drained
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Variable Speed Drive LED Location and Description (Size 24) LED 200 LED 207 STATUS COMM MOC LED Description (Size 24) Reference Color LED200 Status Steady On Off Steady On Condition Description Normal Indicates MOC powered where DC bus at 40volts or higher Abnormal No power, capacitor voltage drained Normal Compressor is running Blinking Abnormal Red LED207 Amber Off If compressor stops, it indicates some fault happening; If compressor is runni
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 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. ! WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Turn off and lock out all power to unit before proceeding.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 9. With using a slot screwdriver, lift up the on the side tab to pry the cover off from the RTV. Be sure not to break the tab. 10. It may be necessary to leverage the screwdriver against cover next to tab so as not to break the tab while loosening. 12. Remove cover, unplug old harness, plug in new harness, verify bushing is reinstalled and plug leads leave the terminal box through the bushing; reinstall cover pushing one side down then the other.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 SmartSense ASSEMBLY w SHIELD GASKET REMOVAL AND INSTALLATION Also see figures 32 through 35 ! WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Turn off the electrical supplies to the unit before performing any maintenance or service.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Fig. 32 – Compressor and Fan Harness (Unit sizes 25, 36, 37, 48, 49 and 60) Fan Motor Harness Plug Compressor Power Harness Wires Yel, Red, Blk Fig. 33 – Compressor and Fan Harness (Unit size 24) 421 08 5600 02 Specifications subject to change without notice.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Fig. 34 – Wire Harness Connections (Unit sizes 25, 36, 37, 48, 49 and 60) Reversing Valve PLUG EXV PLUG Discharge Thermistor PLUG Inverter Ground Wire, GRN / YEL Stripes Inverter Input Power Wires BLK and YEL High Pressure Switch PLUG OAT/OCT PLUG Suction Thermis Thermistor PLUG Suction Pressure Transducer PLUG A150638 Fig. 35 – Wire Harness Connections (Unit size 24) 28 Specifications subject to change without notice.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 COMPRESSOR REPLACEMENT The following is a recommended procedure for compressor replacement. Always refer to the unit product installation, start- up & service instructions for detailed procedures. ! WARNING Failure to follow this warning could result in personal injury or death. Turn off and lock out all power to unit before proceeding.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 8. Remove top two screws holding control box and remove compressor harness (highlighted in yellow below). 9. Cut double loop wire tie on suction tube holding compressor harness, replace with new one provided; do not fasten at this time. Note how the compressor harness is routed to suction tube (highlighted in yellow below). 10. Remove compressor mounting hardware. 11. Cut both suction and discharge lines with tubing cutter.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 21. Route compressor harness choke to left hand side of the top of control box and push in wire tie. Pull wires tight as they enter control box and tighten second wire tie. 22. Reconnect compressor power harness to the inverter. NOTE: Reference enclosed wiring diagrams and unit wiring diagrams in Owner’s Manual to aid in reattaching electrical connections. 23. Triple evacuate the system below 1,000 microns. 24.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 WIRING DIAGRAMS - *VA9 A160127 Fig. 36 – *VA9 WIRING DIAGRAM - Size 24 A160128 Fig. 37 – *VA9 WIRING DIAGRAM - Sizes 25, 36, 37, 48, 49, 60 32 Specifications subject to change without notice.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 WIRING DIAGRAMS - *VH8 A160129 Fig. 38 – *VH8 WIRING DIAGRAM - Size 24 A160130 Fig. 39 – *VH8 WIRING DIAGRAM - Sizes 25, 36, 37, 48, and 60 421 08 5600 02 Specifications subject to change without notice.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 REFRIGERATION SYSTEM Refrigerant ! WARNING UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could result in personal injury or equipment damage. R- 410A refrigerant which has higher pressures than R- 22 and other refrigerants. No other refrigerant may be used in this system. Gauge set, hoses, and recovery system must be designed to handle R- 410A. If you are unsure consult the equipment manufacturer.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 The service valves in the outdoor unit come from the factory front- seated. This means that the refrigerant charge is isolated from the line- set connection ports. The interconnecting tubing (line set) can be brazed to the service valves using industry accepted methods and materials. Consult local codes.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 Evacuation and recovery of refrigerant from *VA9 1. Connect gauges to *VA9 liquid and vapor service valve ports to monitor operating pressures during and 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 ports.
SERVICE MANUAL ! (C,H,T)VA9 & (C,H,T)VH8 diaphragm and closes the pin. The refrigerant flow is effectively stabilized to the load demand with negligible change in superheat. CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. To avoid filter drier damage while brazing, filter drier must be wrapped in a heat- sinking material such as a wet cloth. Install Liquid- line Filter Drier Indoor Install filter drier as follows: 1. 2. 3. 4. Braze 5 in.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 6. Scratch matching marks on tubing studs and old accumulator. Scratch matching marks on new accumulator. Unbraze stubs from old accumulator and braze into new accumulator. 7. Thoroughly rinse any flux residue from joints and paint with corrosion- resistant coating such as zinc- rich paint. 8. Install factory authorized accumulator into system with copper slip couplings. 9. Evacuate and charge system. Pour and measure oil quantity (if any) from old accumulator.
SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8 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. 3. Break vacuum with nitrogen. 4. Remove top cover. 5. Remove screws in base pan to coil grille. 6. Remove coil grille from unit. 7. Remove screws on corner post holding coil tube sheet.
