Basic Control SiEBE18-526
60 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.
Outline In cooling operation fan control, outdoor unit fans are controlled by PI control to come the
cooling Tc to 34°C.
However in normal operation, the fan control restricts lower limit of the number of rotations
according to outdoor air temperature.
Lower Limit Restriction for Cooling Operation Fan Control
Ta≤17ºC Ta≥20ºC
Ta≤15ºC Ta≥18ºC
Ta≤9ºC Ta≥12ºC
Ta: Outdoor air temperature
No limitation
M1F M2F
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
STEP2
STEP1
STEP0
Cooling
Fan Steps
M1F
M2F
STEP8*
STEP1
Heating
Reference
(Q0373)
Lower limit
STEP7
Lower limit
STEP5
Lower limit
STEP1
There are 2 steps in heating operation.
* Depends on models
0 rpm 0 rpm
0 rpm
0 rpm
0 rpm
250 rpm
400 rpm
285 rpm
360 rpm
445 rpm
580 rpm
715 rpm
850 rpm
250 rpm
325 rpm
410 rpm
545 rpm
680 rpm
815 rpm
250 rpm
850 rpm 815 rpm
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