Fujitsu AIRSTAGE J-IIIL Design & Technical Manual page 800

 Auxiliary heater control by outdoor temperature 3
This control selects heat pump or external heater according to the outdoor temperature. Even when
outdoor temperature is high, the heating is performed by using both of heat pump and external
heater.
Operation
Heater on
DIP switch 2-3
Indoor unit fan
setting for
external heater
Heater off
DIP switch 2-3
Indoor unit fan
setting for
external heater
• Temperature of heater on (Thon): Adjustable by function number 62 for indoor unit (Operating
temperature switching of external heaters).
• All control temperatures will shift by adjusting "Thon".
• Outdoor temperature zone boundary B: Adjustable by function setting number 37 for outdoor unit.
• External heater output
Tr-Ts ≥ 0.9°F
(0.5°C)
*: When room temperature stays in this zone for a specific time, auxiliary heater is turned on. For
details, refer to function number 71 for indoor unit.
• Outdoor temperature zone
B + 3.6°F (2°C): 46.4°F (8°C)
*: Adjustable by function setting 37 for outdoor unit
3-3. External output
Heater is on as shown in following diagram of heating
temperature.
On •
•
Enabled •
•
•
Off •
•
Disabled
•
•
Tr-Ts
Off
On
Outdoor temp.
Heat pump only zone
(Heat pump)
B: 42.8°F (6°C)*
Combination zone
(Heat pump + Heater)
Condition
Heater is off as shown in following diagram of heating
temperature.
Other than heating mode
Error occurred
Forced thermostat off
Fan stop protection
Heater is off as shown in following diagram of heating
temperature.
Other than heating mode
Error occurred
Forced thermostat off
*
Tr-Ts (=Thon) < -0.9°F (-0.5°C)
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
- (08-46) -
3. Indoor unit