SiUS281811EA Basic Control
Part 4 Functions and Control 109
2.4 Cooling Operation Fan Control
In cooling operation with low outdoor air temperature, this control is used to provide an adequate
amount of circulation air with liquid pressure secured by high pressure control from the outdoor fan.
Furthermore, when outdoor temperature ≥ 20°C (68°F), the compressor will run in Step 7 or higher.
When outdoor temperature ≥ 18°C (64.4°F), it will run in Step 5 or higher.
When outdoor temperature ≥ 12°C (53.6°F), it will run in Step 1 or higher.
Upper limit of fan
revolutions: Step 8
Upper limit of outdoor fan
revolutions
Step 7
–1 step on
outdoor fan
+1 step on
outdoor fan
Pc
<
2.75 MPa
(399 psi)
PI control
Pc
>
3.24 MPa
(470 psi)
Lapse of 20 seconds
PI control
PI control
Lapse of 20 seconds
Hold the
current step on
outdoor fan
Pc: High pressure sensor detection value
Fan Steps
Step
Fan speed (rpm)
18/24 class
30/36/42/48 class
M1F M2F
1 200 250 0
2 250 400 0
3 300 285 250
4 480 360 325
5 515 445 410
6 620 580 545
7 830 715 680
8 920 850 815
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