Fujitsu AMUG24LMAS Service Manual page 194

 Auxiliary heat pump control by outdoor temperature 1
• External heater output
Operation
Heater on
DIP-SW101-3
Indoor unit fan
setting for
external heater
Heater off
DIP-SW101-3
Indoor unit fan
setting for
external heater
– Temperature of heater on (Thon): Set temperature (Ts) - 0.9 °F (- 0.5 °C)
– Temperature of heater off: Set temperature (Ts) + 0.9 °F (+ 0.5 °C)
Tr-Ts ≥ 0.9°F
(0.5°C)
• Auxiliary heat pump On/Off
– Temperature of heater on (Thon): Adjustable by function number 62 (Operating temperature
switching of heat pump).
– All control temperatures will shift by adjusting "Thon".
Tr-Ts ≥ -1.8°F
(-1°C)
*: When room temperature stays in this zone for a specific time, auxiliary heater is turned on. For
details, refer to function number 71.
4-4. Details of function
Heater is on as shown in following diagram of heating temperature.
On • Heater is off as shown in following diagram of heating
temperature.
• Other than heating mode
• Error occurred
Enabled
• Forced thermostat off
• Fan stop protection
Off • Heater is off as shown in following diagram of heating
temperature.
• Other than heating mode
Disable
d
• Error occurred
• Forced thermostat off
Tr-Ts
Off
Tr-Ts (=Thon) ≤ -0.9°F (-0.5°C)
On
Tr-Ts
Off
*
Tr-Ts (=Thon) < -5.4°F (-3°C)
On
- (05-46) -
Condition
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
4. External input and output