Design Technical Manual

Table Of Contents
AUXILIARY HEAT PUMP CONTROL BY OUTDOOR TEMPERATURE 1
External heater output
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) ... 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 ≥ +0.9°F
(+0.C)
Tr-Ts
Tr-Ts (=Thon) < -0.9°F
(
-0.C)
Auxiliary heat pump thermo ON/OFF
Temperature of auxiliary heat pump ON (Thon) ... Adjustable by Function setting No.62 (Operating
temperature switching of heat pump).
All control temperatures will shift by adjusting "Thon".
Tr: Room temperature
Ts: Set temperature
Thon: Heat pump ON temperature
OFF
ON
Tr-Ts ≥ -1.8°F
(-1°C)
Tr-Ts
Tr-Ts (=Thon) < -5.4°F
(
-C)
Outdoor temperature zone
Heater only zone
*A: -4°F (-20°C)
A + 3.6°F ( 2°C): -0.4°F (-18°C)
Outdoor temp.
*Adjustable by Function setting
When room temperature stays in this zone for a specic time, auxiliary heater is turned on.
For details, refer to indoor unit function number 71 in Chapter. 7 "FUNCTION SETTING".
Combination zone
(Heat pump + Heater)
- (08 - 47) -
EXTERNAL INPUT
& OUTPUT
EXTERNAL INPUT
& OUTPUT