Fujitsu Airstage J-II Series Design & Technical Manual page 858

„ HEATER SELECTION CONTROL BY OUTDOOR TEMPERATURE 1
„
Selects Heat pump or External heater according to the outdoor temperature. When outdoor
temperature is high, the heating is performed by using heat pump only.
Operation
Heater ON
DIP-SW2-3 ON
Indoor unit fan
setting for external
heater: Enable
Heater
OFF
DIP-SW2-3 OFF
Indoor unit fan
setting for external
heater: Disable
▪ Temperature of heater ON (Thon) ... Adjustable by Function setting No.62 (Operating
temperature switching of external heaters).
▪ All control temperatures will shift by adjusting "Thon".
▪ Outdoor temperature zone boundary A and B ... Adjustable individually by Function setting
No. 36 and 37 for outdoor unit.
●External heater output
OFF
Tr-Ts ≥ 0.9°F
(0.5°C)
ON
●Outdoor temperature zone
Outdoor temp.
B + 3.6°F (2°C): 46.4°F (8°C)
*B: 42.8°F (6°C)
A + 3.6°F ( 2°C): -0.4°F (-18°C)
*A: -4°F (-20°C)
▪ Heater ON as shown in diagram of heating temperature
▪ Heater OFF as shown in diagram of heating temperature
▪ Other than Heating mode
▪ Error occurred
▪ Forced thermostat off
▪ Heat pump only zone
▪ Fan stop protection
▪ Heater OFF as shown in diagram of heating temperature
▪ Other than Heating mode
▪ Error occurred
▪ Forced thermostat off
▪ Heat pump only zone
Tr-Ts
Tr-Ts (=Thon) ≤ -0.9°F
(-0.5°C)
Heat pump only zone
(Heat pump)
Combination zone
(Heat pump + Heater)
Heat pump prohibition zone
(Heater)
*Adjustable by Function setting
- (08 - 38) -
Condition
Tr: Room temperature
Ts: Set temperature
Thon: Heater ON temperature