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3. OUTDOOR UNIT CONTROL
3-1 Outdoor fan control
The rotational frequency of outdoor fan is phase-controlled according to the outdoor coil temperature. This control allows the
cooling operation even with the low outside-air temperature and the heating operation even with the high outside-air tempera-
ture.
3-2 Outdoor unit control
The outdoor unit turns ON/OFF the cooling/heating operation according to orders given from the indoor unit.
3-3 Protective functions
1 If an reversed-phase, an open phase, or an indoor controller abnormality is detected, the outdoor unit will stop operation and
the check mode will start. (For the check mode details, see page 48.)
2 If a protective function works, the compressor will stop running. Three minutes later, the compressor will restart. If the protec-
tive function works again, the compressor will stop running and the check mode will start.
3 The protective function is memorized.
4 The memory is cleared when the POWER ON/OFF button on the remote controller is turned OFF. However, the check mode
display continues until the outdoor unit receives the “operation ON” command from the indoor unit.
3-4 COOL/HEAT operation time chart
10 minutes 1
ON
Thermostat
Outdoor fan
4-way valve
(cool)
4-way valve
(HEAT)
Bypass valve
Compressor
Crankcase heater
(with jumper wire
J3)
Crankcase heater
(without jumper
wire J3)
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
60 minutes 60 minutes 60 minutes 60 minutes 60 minutes
3 minutes
10 minutes
3 minutes
Repeats 60-minute
ON/OFF
60 minutes
60 minutes
Operation starts by
POWER button ON.
Operation stops by
POWER button OFF.
The room temperature dis-
played on remote controller
becomes equal to set tem-
perature.
The room temperature dis-
played on remote controller
becomes different from set
temperature.
w1 If compressor restarts within 10 minuteas, 4-way valve remains ON.
OC120--2.qxp 24/6/97 12:32 AM Page 47