HEATER SELECTION CONTROL BY OUTDOOR TEMPERATURE 2
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 Condition
Heater ON ▪ Heater ON as shown in diagram of heating temperature
Heater
OFF
DIP-SW2-3 ON
Indoor unit fan
setting for external
heater: Enable
▪ Heater OFF as shown in diagram of heating temperature
▪ Other than Heating mode
▪ Error occurred
▪ Forced thermostat off
▪ Fan stop protection
DIP-SW2-3 OFF
Indoor unit fan
setting for external
heater: Disable
▪ Heater OFF as shown in diagram of heating temperature
▪ Other than Heating mode
▪ Error occurred
▪ Forced thermostat off
▪ 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 ... Adjustable by Function setting No. 36 for outdoor
unit.
●
External heater output
OFF
ON
Tr-Ts ≥ 0.9°F
(0.5°C)
Tr-Ts
Tr-Ts (=Thon) ≤ -0.9°F
(
-0.5°C)
Tr: Room temperature
Ts: Set temperature
Thon: Heater ON temperature
●
Outdoor temperature zone
Combination zone
(Heat pump + Heater)
Heat pump prohibition zone
(Heater)
*A: -4°F (-20°C)
A + 3.6°F ( 2°C): -0.4°F (-18°C)
Outdoor temp.
*Adjustable by Function setting
- (08 - 40) -
EXTERNAL INPUT
& OUTPUT
EXTERNAL INPUT
& OUTPUT
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