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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.
28
SmartSense Assembly
w/Shield Gasket Removal
and Installation
Also see fig. 32 through Fig. 35
IMPORTANT: DO NOT USE POWER TOOLS TO TIGHTEN
THE INVERTER INPUT SCREW TERMINALS
Removing Inverter:
1. Remove power to the unit. Wait a minimum of two minutes before
servicing the unit to allow inverter capacitors to discharge. Follow
safety instructions located on unit control box cover.
2. Precautions must be taken when servicing components within the
control box of this unit. The technician performing the service must
determine that it is safe to work on or near the inverter. The
electrical disconnect that provides power to the unit must be turned
off, locked and tagged out. This will insure that no damage will
occur to the inverter, controls or other equipment and will prevent
injury if contact is made with the electrical equipment.
3. Remove the control box cover.
4. The inverter capacitors are covered with a protective shield. The
shield should not be removed from the inverter.
5. Before servicing the inverter, verify the inverter voltage is zero.
Measure the DC voltage at the DC + VOLTAGE and DC -
VOLTAGE terminals on the inverter adjacent to the capacitors to
ensure that they have totally discharged. The voltage at these
terminals must be 0 (zero) before servicing (See Figures below).
6. After verifying the voltage has dissipated to zero, disconnect wiring
from the inverter.
7. Disconnect three compressor power wires. Note wire color order –
Yellow, Red, 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 transducer plug.
13. Disconnect suction thermistor plug.
14. Disconnect discharge thermistor plug.
15. Disconnect OAT/OCT plug.
16. Disconnect control wiring (ABCD or thermostat connections)
17. Disconnect two input power wires. Note wire color order – Black
and Yellow.
18. Disconnect inverter ground lead. Note wire color – Green w/
Yellow Stripe.
19. Remove 12 mounting screws and pull out inverter with cover intact.
Installing New Inverter:
1. Install inverter into control box. Attach (12) mounting screws.
2. Re-connect inverter ground lead. Note wire color – Green w/
Yellow Stripe.
3. Re-connect two input power wires. Note wire color order- Black
and Yellow.
4. Re-connect control wiring (ABCD or thermostat connections)
5. Re-connect OAT/OCT plug.
6. Re-connect discharge thermistor plug.
7. Re-connect suction thermistor plug.
8. Re-connect suction pressure transducer plug.
9. Re-connect EXV plug.
10. Re-connect high pressure switch plug.
11. Re-connect reversing valve / PEV plug.
12. Re-connect fan motor power harness plug.
13. Re-connect three compressor power wires. Note wire color order-
Yellow, Red and Black.
14. Replace the control box cover.
15. Apply power to the unit.
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. Follow the operating instructions on the label
attached to the unit
CAUTION
!
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in unit damage or improper
operation.
Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.