Compressor Preheating; External Electrical Heater Control (For Compact Cassette, Mini Duct, Slim Duct, Kgte, Kgtf, Kmte, Kmce, Kmcf, Kete[-B], And Ketf[-B] Series Wall Mounted And Ceiling Types); Electronic Expansion Valve Control - Fujitsu ASYG07-14KGTF 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, KGTE, KGTF, KMTE, KMCE, KMCF,
KETE[-B], and KETF[-B] 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
- (04-71) -
Tn
-2°C
Ts: Setting temperature
Ts -1°C
Ts -10°C
Pulse range
Between 30 and 480 pulses
7. Various control