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Si12-619A
Main Functions
Function and Control
81
1.3
Fan Speed Control
for Indoor Units
Control Mode
The airflow rate can be automatically controlled depending on the difference between the set
temperature and the room temperature. This is done through rotation speed control, or phase
and
Hall IC
control.
For more information about Hall IC, refer to the troubleshooting for fan motor on page 214.
Fan speed Steps
Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
In automatic operation, the step “SL” is not available.
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
Note:
1. Fan stops during defrost operation.
2. In time of thermostat OFF, the fan rotates at the following speed.
Cooling : The fan keeps rotating at the set tap.
Heating : The fan stops.
Automatic Air
Flow Control for
Heating
On heating mode, the indoor fan speed will be regulated according to the indoor heat exchanger
temperature and the difference between the room temperature and the required set point.
Automatic Air
Flow Control for
Cooling
The following drawing explains the principle of fan speed control for cooling:
Wall mounted type 50-60 class
Wall mounted type 20-35 class, 71 class
Duct connected type
Floor standing type
Floor/ceiling suspended type
Step
Cooling
Heating
Cooling
Heating
LLL
LL
L
ML
M
MH
H
HH (Powerful)
H+90
H+90
H+50
H+50
(R6037)
(R6036)
(R6037)
(R6036)
+1.5˚C
+0.5˚C
+2˚C
+1˚C
M
ML
L
fan speed
Difference between room
and set temperature
Thermostat
setting
temperature
(R4594)
DC motor: Rotation speed control
AC motor: Phase control
Summary of Contents for 3MKS50DVM
Page 13: ...Introduction Si12 619A xii ...
Page 131: ...Control Specification Si12 619A 118 Function and Control ...
Page 213: ...Instruction Si12 619A 200 Operation Manual ...
Page 283: ...Check Si12 619A 270 Service Diagnosis ...
Page 302: ...Si12 619A Outdoor Unit E Series 50 52 58 Class Removal Procedure 289 Step Procedure Points ...
Page 385: ...Wiring Diagrams Si12 619A 372 Appendix FTK X S50 60 71FVLT ...
Page 399: ...Si12 619A vi Index ...