Cooling Operation Fan Control - Daikin ERQ Service Manual

ESIE09-05
2.3

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.
-1 step on
outdoor unit fan
Fan Steps
Cooling
STEP0
STEP1
STEP2
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
Function
Upper limit of fan
revolutions: Step 8
Pc < 2.75MPa
Upper limit of outdoor unit
fan revolutions
Step 7
PI control
Lapse of 20 sec.
Hold the
current step on
outdoor unit fan
PI control
M1F
M2F
0 rpm 0 rpm
250 rpm
0 rpm
400 rpm 0 rpm
285 rpm 250 rpm
360 rpm 325 rpm
445 rpm 410 rpm
580 rpm 545 rpm
715 rpm 680 rpm
850 rpm 815 rpm
Pc: HP pressure sensor detection value
Pc > 3.24MPa
PI control
+1 step on
outdoor unit fan
Lapse of 20 sec.
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Basic Control
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