Cooling Operation Fan Control - Daikin E-Series Service Manual

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 ≥ 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.
outdoor unit fan
Fan Steps
Cooling
STEP0
STEP1
STEP2
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
82
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
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
SiAU18-715
Function