Basic Control SiEN18-622
100 Function
2.4 Cooling Operation Fan Control
In cooling operation with low outdoor air temperature, this control is used to provide the
adequate amount of circulation air with liquid pressure secured by high pressure control using
outdoor unit fan.
Furthermore, when outdoor temperature ≥ 20°C, the compressor will run in Step 7 or higher.
When outdoor temperature ≥ 18°C, it will run in Step 5 or higher.
When outdoor temperature ≥ 12°C, it will run in Step 1 or higher.
850rpm
715rpm
580rpm
445rpm
360rpm
285rpm
400rpm
250rpm
0 rpm
M1F
815rpm
680rpm
545rpm
410rpm
325rpm
250rpm
0 rpm
0 rpm
0 rpm
M2F
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
STEP2
STEP1
STEP0
Cooling
Fan Steps
Upper limit of fan
revolutions: Step 8
Upper limit of outdoor unit
fan revolutions
Step 7
-1 step on
outdoor unit fan
+1 step on
outdoor unit fan
Pc
<
2.75MPa
PI control
Pc
>
3.24MPa
Lapse of 20 sec.
PI control
PI control
Lapse of 20 sec.
Hold the
current step on
outdoor unit fan
Pc: HP pressure sensor detection value
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