Service manual
Table Of Contents
- TopPage
- SPECIFICATIONS
- EXPLANATION OF CIRCUIT AND OPERATION
- [1] BLOCK DIAGARM
- [2] FUNCTIONS
- 1. FREQUENCY CONTROL
- 2. OVER CURRENT PROTECTION
- 3. COMPRESSOR PROTECTION CONTROL
- 4. POWER TRANSISTOR MODULE PROTECTION
- 5. SERIAL SIGNALS
- 6. THERMISTOR OPEN OR SHORT
- 7. MISWIRING CHECK
- 8. SAFETY TIME
- 9. PUMP DOWN SWITCH
- 10. CONTROL OF COMPRESSOR OR AND EXPANSION VALVE
- 11. DEFROST OPERATION
- 12. Power factor module Output voltage
- [3] ACTIVE FILTER CIRCUIT
- [4] EXPLANATION OF IPM DRIVE CIRCUIT
- FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
- REFRIGERATION CYCLE
- DISASSEMBLING PROCEDURE
- PartsGuide
- EndPage
AEX3M18JR
5 – 5
25.Disconnect the 6 terminals (P, Io, +, -, L1, L2) and 1 connector
(CN13) on the active filter. And Remove the 2 screws fixing the
power module and remove it.
NOTE: When the active filter re-install, silicone grease must be paste
to the back face of the Active Filter.
CAUTION: Fix the connector of the power module securely.
2. Mounting position of thermistors and expansion valves
Mounting position of thermistors and expansion valves are shown below.
Thermistor
• Check the cord color of thermistor before mounting.
• Thermistor Suction, Suction A, Suction B, Suction C are mounted on GAS side pipes.
• Thermistor Heat exchanger is mounted on LIQUID side pipe.
Expansion valve
• Check the labels before connecting to the Control Board Unit.
CAUTION: Mismounting and misconnecting will cause error or failure.
Active filter
or
Power transistor
module(IPM)
NG
OK
Thermistor Suction B (White)
Thermistor Heat exchanger (Orange)
Thermistor Suction A (Blue)
Thermistor Suction (Black)
Thermistor Suction C (Brown)
Label
Connector label
Expansion valve C
Label
Expansion valve B
Label
Expansion valve A
B A
Expansion valve
Thermistor
C
Heat
exchanger
Compressor
Suction B
Suction C
Suction A
Suction
Outdoor temp.