Fujitsu AMUG24LMAS, Service Manual

Page: 193 / 200


Auxiliary heat pump control
• External heater output
Operation Condition
Heater on
Heater is on as shown in following diagram of heating
temperature.
Heater off
DIP-SW101-3 On • Heater is off as shown in following diagram of heating
temperature.
• Other than heating mode
• Error occurred
• Forced thermostat off
• Fan stop protection
Indoor unit fan
setting for
external heater
Enabled
DIP-SW101-3 Off • Heater is off as shown in following diagram of heating
temperature.
• Other than heating mode
• Error occurred
• Forced thermostat off
Indoor unit fan
setting for
external heater
Disabled
– 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: 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)
• 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: Room temperature
Ts: Set temperature
Thon: Heater on temperature
Off
On
*
Tr-Ts
Tr-Ts ≥ -1.8°F
(-1°C)
Tr-Ts (=Thon) < -5.4°F (-3°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
- (05-45) -
4. External input and output
FIELD WORKING FIELD WORKING