Fresh Air Control; External Electrical Heater Control - Fujitsu ARU7RLF Service Instruction

18. FRESH AIR CONTROL( For AU / AR type)
The fan motor for Fresh Air is operated in synchronization with the indoor fan operation
as shown in Figure 14.
(Fig.14 : Fresh Air control)
Fan motor
(Indoor unit)
Fan motor
(for Fresh Air)
*It needs the external relay and power supply.
19. EXTERNAL ELECTRICAL HEATER CONTROL (For AR type)
The External Electrical Heater is operated as below.
< Heater : ON condition >
When all of the following conditions are met, external elecrtical heater will operate according to Figure 15.
System type
Operation mode
Compressor
Indoor fan
< Heater : OFF condition >
1). When one of the ON conditions is not met.
2). When Defrost operation or Oil recovery operation starts
(Fig. 15 : External electrical heater control)
Ts -6°F(-3°C)
Ts -24°F(-12°C)
When the room
temperature drops
Operation
Stop
Operation
Stop
Heatpump
Heating
ON
ON (S-Lo is excluded)
Heater : OFF
Heater : ON
Heater : OFF
When the room
temperature rises
Ts : Setting temperature
Ts -2°F(-1°C)
Ts -20°F(-10°C)
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