Fujitsu ACUH09LUAS1, Service Manual

Page: 133 / 153

7-6. External electrical heater control
The external electrical heater is operated as below.
When the room
temperature rises
When the room
temperature drops
Ts: Setting temperature
Heater : Off
Heater : On
Heater : Off
Ts - 5.4°F
(Ts -3 ° C)
Ts - 21.6°F
(Ts -12 ° C)
Ts - 1.8°F
(Ts -1 ° C)
Ts - 18.0°F
(Ts -10 ° C)
NOTES:
• →hen the compressor stop, external electric heater is off.
• It operates only in heating mode and when the indoor fan operates. (However, S-LO→ is exclud-
ed.)
7-7. Electronic expansion valve control
The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the table below.
Operation mode Pulse range
Cooling/dry mode
Between 52 and 480 pulses
Heating mode
NOTE: At the time of supplying the power to the outdoor unit, the initialization of the electronic ex-
pansion valve is operated (528 pulses are input to the closing direction).
7-6. External electrical heater control
- (04-27) -
7. Various control
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S
C
O
N
TR
O
L
A
N
D
FU
N
C
TI
O
N
S