External Electrical Heater Control; Electronic Expansion Valve Control - Fujitsu RCG24KVLA Service Instruction

7-7. External electrical heater control

The external electrical heater is operated as below.
Ts -3°C
Ts -12°C
When the room
temperature drops
NOTES:
• When the compressor stop, external electric heater is off.
• It operates only in heating mode and when the indoor fan operates. (However, S-LOW is exclud-
ed.)

7-8. Electronic expansion valve control

The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the table below.
Operation mode
Cooling/dry mode
Heating mode
NOTE: At the time of supplying the power to the outdoor unit, the initialization of the electronic ex-
pansion valve is operated (528 pulses are input to the closing direction).
7-7. External electrical heater control
When the room
temperature rises
Heater : Off
Heater : On
Heater : Off
- (04-22) -
Ts: Setting temperature
Ts -1°C
Ts -10°C
Pulse range
Between 52 and 480 pulses
7. Various control