If P8 on the outdoor unit circuit board is shorted while the compressor is on during heating mode operation and the
temperature detected by the outdoor unit heat exchanger outlet sensor is 25°C or lower, defrosting is carried out regardless
of the current starting conditions.
2. Operation
a. During defrosting, the outdoor unit turns on the compressor and turns off the outdoor unit fan and the reversing valve.
b. The indoor unit fan operates at LOW speed for 30 seconds upon defrosting starts, After this, the indoor unit fan turns off until
defrosting is completed.
(During defrosting, the louvre of the indoor unit stays at horizontal position).
27.9. Indoor thermostat charateristics
1. Thermostat characteristics during cooling and heating modes.
Operation mode Setting temperature (To) Room temperature (°C)
Operation Differential
2.0K 4.0K
Cooling 16 ON 18.0 ____
OFF 16.0 ____
31 ON 33.0 ____
OFF 31.0 ____
Heating *1 16 ON 18.0 20.0
OFF 20.0 22.0
29~31 ON 31.0 31.0
*1 (27~31) OFF 33.0 33.0
1* If jumper wire J3 on the indoor unit circuit board is disconnected, the thermostat characteristics
during heating become 2K or higher.
NOTE: If the remote control display setting temperature (To) is 29°C or higher, the heating thermostat turns
on when the room temperature is 31°C.
2. Thermostat characteristics during dry mode.
During dry mode operation, cooling mode operation is carried out in accordance with the indoor temperature as shown in the
table below.
* When modes (2) and (3) are active, dry mode operation starts when the cooling thermostat turns on.
When modes (2) and (3) have been stopped, the 10 min./5 min. times have no relevance. However, if the indoor temperature
is less than or equal to the remote control unit setting temperature, mode (4) is forcibly activated.
67
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