Compressor Preheating; Electronic Expansion Valve Control; Prevention To Restart For 3 Minutes (3 Minutes St) - Fujitsu ASTG30KMTC Service Manual

7-8. Compressor preheating

By preheating the compressor, warm airflow is quickly discharged when the operation is started.
• Triggering condition 1
– Outdoor temperature ≤ 20°C
When outdoor temperature reaches following degrees, compressor preheating stops.
30 model
34 model
– 30 minutes after compressor stopped
• Triggering condition 2

7-9. 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).

7-10. Prevention to restart for 3 minutes (3 minutes st)

Compressor won't enter operation status for 140 seconds after compressor is stopped, even if any
operation is given.
7-8. Compressor preheating
25°C
26°C
Tn
Tn
Off
0°C
On
Tn: Outdoor unit heat exchanger temp.
- (04-22) -
2°C
Pulse range
Between 32 and 480 pulses
Between 45 and 480 pulses
7. Various control