Compressor Preheating; External Electrical Heater Control (For Compact Cassette, Mini Duct, Slim Duct, Medium Static Pressure Duct, Kgte, Kmte, Kmce, And Kete Series Wall Mounted And Ceiling Types); Electronic Expansion Valve Control - Fujitsu AUXG07KVLA Service Manual

7-8. Compressor preheating

By preheating the compressor, warm airflow is quickly discharged when the operation is started.
• Triggering condition
– 30 minutes after compressor stopped.
– Outdoor unit heat exchanger temperature (Tn)
7-9. External electrical heater control (For Compact cassette,
Mini duct, Slim duct, Medium static pressure duct, KGTE,
KMTE, KMCE, and KETE series wall mounted and Ceiling
types)
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.)

7-10. 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 (700 pulses are input to the closing direction).
7-8. Compressor preheating
Tn
Off
-4°C
On
When the room
temperature rises
Heater : Off
Heater : On
Heater : Off
- (04-72) -
Tn
-2°C
Ts: Setting temperature
Ts -1°C
Ts -10°C
Pulse range
Between 30 and 480 pulses
7. Various control