Fujitsu ARC90LHTA User Manual

01-15
1-15. COMPRESSOR PREHEATING
When 30 minutes has passed after power-on or operation stop, the preheating is started according
to the outdoor unit heat exchanger (outlet) temperature as shown in Fig.11.
It applies the current to compressor and the compressor is heated.
(By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started, the preheating ends.
OFF
ON
-5°C
-3°C
When outdoor unit
heat exchanger (outlet)
temperature drops
When outdoor unit
heat exchanger (outlet)
temperature rises
(Fig 11 : Condition of the compressor preheating)
The fan motor for Fresh Air is operated in synchronization with the indoor fan operation
as shown in Fig.12.
1-16. FRESH AIR CONTROL
(Fig 12 : Fresh Air control)
ON
OFF
ON
OFF
Fan motor
(Indoor unit)
Control signal
(for Fresh Air)
It operates only in Heating mode
and when the indoor fan operates.
(However, S-Lo is excluded)
12V
Operation mode : Heating mode
Compressor : ON
Indoor fan : ON
Model type : Heat pump
Room temperature zone : B zone
1-17. EXTERNAL ELECTRICAL HEATER CONTROL
(Fig 13 : External Electrical Heater control)
When the room
temperature rises
When the room
temperature drops
Ts : Setting temperature
Heater : OFF ( A zone )
Heater : ON ( B zone )
Heater : OFF ( C zone )
Ts -10°C
Ts -1°C
Ts -3°C
Ts -12°C
A / C zone
ON
OFF
Room temperature
zone in Heating
Control signal
(for External Heater)
12V
B zone
The External Electrical Heater operates when it meets all the following conditions.
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Fujitsu ARC90LHTA Specifications

General

Brand	Fujitsu
Model	ARC90LHTA
Category	Air Conditioner
Language	English