Cool" Position For Outdoor Air Unit; Heat" Position For Outdoor Air Unit - Fujitsu AUXB04GALH Service Manual

3-2-7 "COOL" Position for Outdoor air unit

When using the cooling mode, set the temperature to a value lower than the discharge airflow temperature, otherwise
the outdoor air unit will not start the cooling operation and only the fan will rotate.
An example for COOLING TEMPERATURE CONTROL time chart (Manual setting)
Outdoor temp.
• Discharge airflow
Ts
Temperature
Ts - 5°C
• Refrigerant
ON
flow
OFF
100%
• Opening of
0%
EEV
• Outdoor air unit ON
fan OFF
Ts : Corrected setting temperature

3-2-8 "HEAT" Position for Outdoor air unit

(1) When using the heating mode, set the temperature to a value higher than the discharge airflow temperature, otherwise
the outdoor air unit will not start the heating operation.
(2) During defrosting, the OPERATION indicator lamp flashes 6 sec. ON and 2 sec. OFF, and repeat. The heating operation
will be temporarily interrupted.
An example for HEATING TEMPERATURE CONTROL time chart (Manual setting)
Ts +5°C
• Discharge airflow
Temperature
Ts
Outdoor temp.
• Refrigerant
ON
flow
OFF
100%
• Opening of
0%
EEV
• Outdoor air unit ON
OFF
fan
Ts : Corrected setting temperature
Excess capacity area
Compressor ON Compressor OFF
(6 minutes) (3 minutes)
Compressor ON
Compressor OFF
(6 minutes)
(3 minutes)
5 minutes has passed
at excess capacity area
Compressor ON
(6 minutes)
Ts + 0.5°C : The thres hold temperature of start of refrigerant flow
Ts - 5°C : The thres hold temperature of stop of refrigerant flow
Excess capacity area Excess capacity area
Compressor ON
(6 minutes)
Ts - 0.5°C : The thres hold temperature of start of refrigerant flow
Ts + 5°C for 5 minutes or more
: The thres hold temperature of stop of refrigerant flow
03-09
5 minutes has passed
at excess capacity area