![background image](http://html1.mh-extra.com/html/daikin/ft25cv1a/ft25cv1a_service-manual_2459308043.webp)
Functions of Heat Pump Models
Si01-406
32
Functions and Control
2.3
Fan Speed Control
for Indoor Units
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
Hall IC
, refer to troubleshooting for fan motor on page 90.
Phase Steps
Phase control and fan speed control contains 8 steps: LLL, LL, L, ML, M, MH, H and HH.
= Within this range the air flow rate is automatically controlled when the FAN setting
button is set to automatic.
Note:
1. During powerful operation, fan operate H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
Air Flow Rate
Control
for
Heating
The following drawing explains the principle for fan speed control for heating:
Air Flow Rate
Control for
Cooling
The following drawing explains the principle of fan speed control for cooling:
Step
Cooling
Heating
Dry mode
LLL (Heating thermostat OFF)
25 · 35kW class :
500 - 860 rpm
(During powerful operation :
850 - 910 rpm)
LL (Cooling thermostat OFF)
L
ML
M
MH
H
HH (Powerful)
(R2818)
(R2818)
-1.5˚C
-0.5˚C
-1˚C
-2˚C
L
ML
M
Thermostat
setting
temperature
Phase control
Difference between room
and set temperature
fan speed
(R2819)
+1.5˚C
+0.5˚C
+2˚C
+1˚C
M
ML
L
fan speed
Difference between room
and set temperature
Phase control
Thermostat
setting
temperature
(R2820)
Summary of Contents for FT25CV1A
Page 7: ...Si01 406 vi Table of Contents...
Page 15: ...Functions Si01 406 4 List of Function...
Page 21: ...Specifications Si01 406 10 Specifications...
Page 205: ...Wiring Diagrams Si01 406 194 Appendix...
Page 209: ...Si01 406 iv Index...