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
4 – 1
AEX3M18JR
Service Manual
CHAPTER 4. REFRIGERATION CYCLE
[1] REFRIGERATION SYCLE
Refrigeration Cycle
Flow of Refrigerant
1. Cycle temperature and pressure in stop valve
Running unit No
Operation Mode
Cool (MAX) Cool (Test run) Heat (MAX) Heat (Test run)
AY-XPM7FR &
AY-XPM7FR &
AY-XPM7FR
(3 units)
(1) 86 70 78 50
(2) 45 41 -1 2
(3) 12 15 35 27
(4) 15 19 0 3
Stop valve pressure (gas side) 1.04MPa(abs) 1.21MPa(abs) 2.53MPa(abs) 1.97MPa(abs)
Frequency 100Hz 70Hz 120Hz 50Hz
AY-XPM12FR
(1 unit)
(1) 80 67 89 59
(2) 38 37 1 3
(3) 10 13 42 25
(4) 11 17 2 6
Stop valve pressure Frequency 0.88MPa (abs) 1.10MPa (abs) 3.52MPa (abs) 2.38MPa (abs)
Frequency 70Hz 40Hz 90Hz 40Hz
Heat exchanger
Heat exchanger
Heat exchanger
UNIT C
UNIT B
UNIT A
STOP valve (Liquid)
Compressor
4-way valve
Accumulator
STOP valve (Gas)
Expansion valve C
Expansion valve B
Expansion valve A
(1)
(4)
(2)
(3)
(3)
(3)
Heat exchanger
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
UNIT C
UNIT B
UNIT A
Cooling heating