Cooling Operation Fan Control - Daikin D-Series Service Manual

Si18-525B
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
Function
Lower limit
STEP7
Ta≤17ºC Ta≥20ºC
Lower limit
STEP5
Ta≤15ºC Ta≥18ºC
Lower limit
STEP1
Ta≤9ºC Ta≥12ºC
No limitation
Ta: Outdoor air temperature
Fan Steps
Cooling M1F
0 rpm
STEP0
STEP1 250 rpm
400 rpm
STEP2
STEP3 285 rpm
STEP4 360 rpm
445 rpm
STEP5
STEP6 580 rpm
STEP7 715 rpm
850 rpm
STEP8
Reference
Heating M1F
250rpm
STEP1
850 rpm
STEP8*
There are 2 steps in heating operation.
* Depends on models
Basic Control
M2F
0 rpm
0 rpm
0 rpm
250 rpm
325 rpm
410 rpm
545 rpm
680 rpm
815 rpm
M2F
0 rpm
815rpm
(Q0373)
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