Heat pump prohibition control
Perform heating by external heater only. Indoor unit is continuous thermostat off.
Operation Condition
Heater on Heater is on as shown in following diagram of heating temperature.
Heater off
• Heater is off as shown in following diagram of heating temperature.
• Other than heating mode
• Error occurred
• Forced thermostat off
• Temperature of heater on (Thon): Adjustable by function number 62 (Operating temperature
switching of external heaters).
• All control temperatures will shift by adjusting “Thon”.
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
Off
On
Tr-Ts
Tr-Ts (=Thon) ≤ -0.9°F (-0.5°C)
Tr-Ts ≥ 0.9°F
(0.5°C)
• Operation status
On
0.9°F (0.5°C)
-0.9°F (-0.5°C)
On
12 V
On
Off
Off
0 V
Off
Heating operation
Heater
Fan
Air conditioner
Room temperature
Set temp.
3 min or more
NOTE:
In following operations, compressor will be on.
• Other than heating
• Test run
2-4. Details of function
- (05-23) - 2. External input and output
FIELD
WORKING
FIELD
WORKING
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