Fan Control; Indoor Fan Control - Fujitsu ABYG18KRTA Service Manual
Ceiling type air conditioner
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Also See for ABYG18KRTA:
- Design & technical manual (113 pages) ,
- Service manual (482 pages) ,
- Design & technical manual (461 pages)
Table of Contents
3. Fan control
Tr: Room temperature
Ts: Setting temperature
3-1. Indoor fan control
¢ Fan speed
Indoor fan speed is defined as below.
Operation
Fan mode
mode
HIGH
MED+
MED
LOW-
Heating
QUIET
Cool air
prevention
S-LOW
HIGH
MED
LOW
Cooling/Fan
QUIET
Soft quiet
S-LOW
Dry
*1: Fan mode only
*2: Cooling mode only
¢ Fan operation
Airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH while indoor unit fan
only runs.
When fan mode is set at AUTO, it operates on MED fan speed.
¢ Cooling operation
Switch the airflow AUTO, and indoor fan motor will run according to room temperature, as below.
On the other hand, if switched in HIGH—QUIET, indoor motor will run at a constant airflow of COOL
operation modes QUIET, LOW, MED, HIGH as shown in "Fan speed" above.
Airflow change over (Cooling: Auto)
2°C
3-1. Indoor fan control
18
22
950
1,020
900
940
880
880
800
800
750
750
500
500
300
300
950
1,020
880
880
800
800
750
750
1
500*
500*
2
300*
300*
X zone: 750
X zone: 750
J zone: 750
J zone: 750
Tr - Ts ≥
2°C
> Tr - Ts ≥
1°C
1°C > Tr - Ts
When room
temperature drops
Speed (rpm)
24
970
890
810
720
620
500
300
970
810
720
620
1
1
500*
2
2
300*
X zone: 620
X zone: 680
J zone: 620
J zone: 680
Tr - Ts ≥
HIGH mode
2.5°C
MED mode
1.5°C > Tr - Ts
LOW mode
When room
temperature rises
- (04-15) -
30
36
1,090
1,090
1,000
1,020
900
920
800
830
680
700
500
500
300
300
1,090
1,120
900
920
800
830
680
700
1
1
500*
500*
2
2
300*
300*
X zone: 700
X zone: 740
J zone: 700
J zone: 740
2.5°C
> Tr - Ts ≥
1.5°C
45
1,120
1,030
940
870
740
500
300
1,140
940
870
740
1
500*
2
300*
3. Fan control
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