Fujitsu AUUH18LUAS - Electronic Expansion Valve Control; External Electrical Heater Control

7-7. 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.)
7-8. 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.
• Model: AOUH18LUAS1
Operation mode Pulse range
Cooling/dry mode
Between 52 and 480 pulses
Heating mode
• Model: AOUH24LUAS1
Operation mode Pulse range
Cooling/dry mode Between 47 and 480 pulses
Heating mode Between 39 and 480 pulses
• Models: AOUH30LUAS1 and AOUH36LUAS1
Operation mode Pulse range
Cooling/dry mode
Between 47 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).
7-7. External electrical heater control - (04-31) - 7. Various control
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS