Outdoor Unit Fan Control In Cooling Operation - Daikin ERQ Series Service Manual

Basic Control
2.4

Outdoor Unit Fan Control in Cooling Operation

While in cooling operation, if the outdoor temperature is low, this mode provides high-pressure
control using the outdoor unit fan to retain appropriate liquid pressure, thus ensuring refrigerant
circulation rate to be supplied to AHU.
28
Pc < 2.75MPa
Upper limit of outdoor unit
PI control
Lapse of 20 sec.
-1 step on
outdoor unit fan
PI control
Upper limit of fan
revolutions: Step 8
Pc > 3.24MPa
fan revolutions
Step 7
PI control
Hold the
current step on
outdoor unit fan
Lapse of 20 sec.
ESiEN09-06 A
*For fan revolutions in each step,
refer to information on page 107.
+1 step on
outdoor unit fan
Function