Basic Control
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
When outdoor temperature
When outdoor temperature
outdoor unit fan
Fan Steps
Cooling
STEP0
STEP1
STEP2
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
52
Upper limit of fan
revolutions: Step 8
Pc < 2.75MPa
Upper limit of outdoor unit
PI control
Lapse of 20 sec.
-1 step on
PI control
M1F
0 rpm
250 rpm
400 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
≥
20°C, the compressor will run in Step 7 or higher.
≥
18°C, it will run in Step 5 or higher.
≥
12°C, it will run in Step 1 or higher.
Pc > 3.24MPa
fan revolutions
Step 7
PI control
Hold the
current step on
outdoor unit fan
Lapse of 20 sec.
M2F
0 rpm
0 rpm
0 rpm
Pc: HP pressure sensor detection value
+1 step on
outdoor unit fan
SiBE34-802
Function