Cooling Operation - Fujitsu AUXB04GALH Service Manual

3-8-3 FUNDAMENTAL FUNCTIONS

Cooling operation

When using the cooling mode, set the temperature to a value lower than the target controlling temperature, otherwise
the External refrigeration cycle equipment will not start the cooling operation.
An example for COOLING TEMPERATURE CONTROL time chart
+ 0.5 C: Air intake ctrl
Ts
+ 0.5 C: Air discharge ctrl
• Temperature Ts
- 0.5 C: Air intake ctrl
Ts
- 5.0 C: Air discharge ctrl
• Refrigerant ON
flow OFF
100%
• Opening of
0%
EEV
ON
• Indoor fan*
OFF
Heating operation
(1) When using the heating mode, set the temperature to a value higher than the current room temperature, otherwise
the indoor unit will not start the heating operation.
(2) After the start of heating operation, the fan of indoor unit will not rotate until the heater exchange is warmed up to
blow out warm air.
During defrosting, the OPERATION indicator lamp flashes 6 sec. ON and 2 sec. OFF, and repeat. The heating operation
(3)
will be temporarily interrupted.
An example for HEATING TEMPERATURE CONTROL time chart
+ 0.5 C: Air intake ctrl
Ts
+ 5.0 C: Air discharge ctrl
• Temperature Ts
- 0.5 C: Air intake ctrl
Ts
- 0.5 C: Air discharge ctrl
• Refrigerant ON
OFF
flow
100%
• Opening of
0%
EEV
ON
• Indoor fan*
OFF
3Min.
T : Target controlling temperature (Air intake temperature or Air discharge temperature)
R
Ts: Corrected Setting temperature
Air intake temp controlling
Ts + 0.5 C : The threshold temperature of start of refrigerant flow
Ts - 0.5 C : The threshold temperature of stop of
Air discharge temp controlling
Ts + 0.5 C : The threshold temperature of start of
Ts - 5.0 C : The threshold temperature of stop of
.
Ts : Corrected Setting temperature
T : Target controlling temperature (Air intake temperature or Air discharge temperature)
R
Air intake temp controlling
Ts - 0.5 C : The threshold temperature of start of
Ts + 0.5 C : The threshold temperature of stop of
Air discharge temp controlling
Ts - 0.5 C : The threshold temperature of start of
Ts + 5.0 C: The threshhold temperature of stop of refrigerant flow
*When the EEV operates with the minimum pulse, and it keeps for 5 minutes.
T
R
refrigerant flow
refrigerant flow
refrigerant flow
: Duration of cold air prevention
refrigerant flow
refrigerant flow
refrigerant flow
03-27
T
R