Fan Speed Control For Indoor Units - Daikin SUPER MULTI NX G Series Service Manual

SiUS12-928_A
1.4

Fan Speed Control for Indoor Units

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. This is done through phase control and Hall IC
control.
For more information about Hall IC, refer to the troubleshooting for fan motor on page 106, 107.
Automatic Fan In automatic fan speed operation, the step "SL" is not available.
Speed Control
LLL
LL
SL
L
ML
M
MH
H
HH (POWERFUL)
<Cooling>
The following drawing explains the principle of fan speed control for cooling.
<Heating>
In heating mode, 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: 1. During POWERFUL operation, fan rotates at H tap + 50 ~ 90 rpm.
2. Fan stops during defrost operation.
Function and Control
Step
= The airflow rate is automatically controlled within this range when the FAN setting button
is set to automatic.
Fan speed
+1.5˚C (2.7˚F)
+0.5˚C (0.9˚F)
Cooling Heating
(R6833) (R6833)
M
+2˚C (3.6˚F) Difference between the room thermistor
ML
temperature and the target temperature
+1˚C (1.8˚F)
L
Main Functions
Dry
750 - 1000 rpm
(During POWERFUL
operation : 1050 rpm)
(R12403)
32