Auto Changeover Operation - Fujitsu ASU9RL Service Instruction

4. AUTO CHANGEOVER OPERATION

When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum
mode from among the HEATING, COOLING, DRY and MONITORING modes. During operation, the
optimum mode is automatically switched in accordance with temperature changes. The temperature
can be set between
When operation starts, only the indoor and outdoor fans are operated for 1 minute. After 1 minute,
1
the room temperature and outside air temperature are sensed and the operation mode is
selected in accordance with the table below.
( Fig.5 : Outside air temperature zone selection )
C zone
90°F(32°C)
B zone
14°F(-10°C)
A zone
( Table.5 Operation mode selection table)
Outside air temperature (TO)
Room temperature (TB)
TB >
TS+4°F(+2°C)
TB <
2 When COOLING was selected at
The same operation as COOLING OPERATION of item 1 above is performed.
When the room temperature has remained at (set temperature -2°F(-1°C)) for 8 minutes, operation
is automatically switched to DRY and the same operation as DRY OPERATION of item 3 above
is performed.
If the room temperature reaches (set temperature
to COOLING operation.
3 When HEATING was selected at
is performed.
When the compressor was stopped for 6 consecutive minutes by the temperature control function
4
after the COOLING or HEATING operation mode was selected at
to MONITORING and the operation mode is selected again.
64°F(18°C) and 86°F(30°C)
TS+4°F(+2°C)
TB TS -4°F(-2°C)
TS-4°F(-2°C)
, the air conditioner operates as follow:
1
, the same operation as HEATING OPERATION of item 2 above
1
in 2°F(1°C) steps.
A zone B zone
Cooling
Monitoring
(automatic dry)
Monitoring Monitoring
Heating Heating
+4°F(+2°C) during DRY operation, operation returns
above, operation is switched
1
05-04
C zone
Cooling
(automatic dry)
Monitoring
Monitoring