Cooling Operation Fan Control - Daikin RXSQ24TAVJU Service Manual

SiUS331708EA
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.
–1 step on
outdoor fan
Fan Steps
Step
RXSQ24/36TAVJU
1
2
3
4
5
6
7
8
Functions and Control
Upper limit of fan
revolutions: Step 8
Pc < 2.75 MPa
(399 psi)
Upper limit of outdoor fan
revolutions
Step 7
PI control
Lapse of 20 seconds
Hold the
current step on
outdoor fan
PI control
RXSQ48TAVJU
200
250
300
480
515
620
830
920
Pc: High pressure sensor detection value
Pc > 3.24 MPa
(470 psi)
PI control
Lapse of 20 seconds
Fan speed (rpm)
200
250
300
360
430
515
620
920
+1 step on
outdoor fan
RXSQ60TAVJU
M1F
250
400
285
360
445
580
715
850
Basic Control
M2F
0
0
250
325
410
545
680
815
44