Fan Speed Control For Indoor Units - Daikin FT25CV1A Service Manual

Functions of Heat Pump Models
2.3 Fan Speed Control
Control Mode The air flow rate can be automatically controlled depending on the difference between the set
temperature and the room temperature. This is done through phase control and Hall IC control.
For more information about
Phase Steps Phase control and fan speed control contains 8 steps: LLL, LL, L, ML, M, MH, H and HH.
LLL (Heating thermostat OFF)
LL (Cooling thermostat OFF)
L
ML
M
MH
H
HH (Powerful)
Note: 1. During powerful operation, fan operate H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
Air Flow Rate The following drawing explains the principle for fan speed control for heating:
Control for
Heating
Air Flow Rate The following drawing explains the principle of fan speed control for cooling:
Control for
Cooling
32
for Indoor Units
Hall
Step
= Within this range the air flow rate is automatically controlled when the FAN setting
button is set to automatic.
Thermostat
setting
temperature
-0.5˚C
-1.5˚C
fan speed
fan speed
+1.5˚C
+0.5˚C
Thermostat
setting
temperature
IC, refer to troubleshooting for fan motor on page 90.
Cooling Heating
(R2818) (R2818)
Phase control
L
-1˚C
ML
-2˚C
M
M
+2˚C
ML
+1˚C
L
Phase control
Dry mode
25 · 35kW class :
500 - 860 rpm
(During powerful operation :
850 - 910 rpm)
Difference between room
and set temperature
(R2819)
Difference between room
and set temperature
(R2820)
Functions and Control
Si01-406