Design Technical Manual

Table Of Contents
HEAT PUMP PROHIBITION CONTROL
Perform heating by external heater only. VRF indoor unit is Continuous thermostat OFF.
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".
Tr: Room temperature
Ts: Set temperature
Thon: Heater ON temperature
OFF
ON
Tr-Ts ≥ 0.F
(0.C)
Tr-Ts
Tr-Ts (=Thon) -0.9°F
(
-0.C)
- (08 - 38) -
EXTERNAL INPUT
& OUTPUT
EXTERNAL INPUT
& OUTPUT