Daikin FTKM18PVMK, Service Manual

Page: 31 / 119

SiMT041509E Main Functions
Function and Control 16
1.4 Fan Speed Control for Indoor Unit
Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH.
The airflow rate can be automatically controlled depending on the difference between the room
thermistor temperature and the target temperature.
Automatic Fan
Speed Control In automatic fan speed operation, the step SL is not available.
= The airflow rate is automatically controlled within this range when the FAN setting
button is set to automatic.
<Cooling>
The following drawing explains the principle of fan speed control for cooling.
*The upper limit is M tap for 30 minutes from the operation start.
<Heating>
In heating operation, the fan speed is regulated according to the indoor heat exchanger
temperature and the difference between the room thermistor temperature and the target
temperature.
Note: The fan stops during defrost control.
COMFORT
AIRFLOW
Operation
„
The fan speed is controlled automatically within the following steps.
<Cooling>
L tap ~ MH tap (same as automatic)
<Heating>
L ~ M tap
„
The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
Step Cooling Heating
LLL
LL
L
ML
M
MH
H
HH (POWERFUL) (R11681) (R6834)
(R14588)
Fan speed
+2.5°C
+1.5°C
+0.5°C
MH*
M
ML
L
+3°C
+2°C
+1°C
Room thermistor temperature – target temperature