Panasonic CS-A18BD3P Service Manual page 64

(The fan operates at LOW speed for the remainder of the 30 seconds in (1), and then hot start commences.)
26.7. Defrost mode operation time chart
1. Start and completion of defrosting
a. Start
During heating mode operation (including automatic heating), after the 45-minute defrosting cycle time has
passed, defrosting starts if the temperature detected by the outdoor unit heat exchanger outlet sensor is
2°C or lower for a continuous 5-minute period.
However, if the outdoor unit fan is stopped, the start of defrosting will be delayed by 5 minutes.
The defrosting cycle is 50 minutes from the start of heating mode operation.
b. Completion
Defrosting mode operation stops 12 minutes after it starts, or if the temperature detected by the outdoor
unit heat exchanger outlet sensor is 25°C or higher.
After defrosting is complete, hot starting commences.
c. Forced defrosting
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 rever-
sing valve.
b. The indoor unit fan operates at LOW for 30 seconds after defrosting starts. After this, the indoor unit fan turns off until
defrosting is complete.
(During defrosting, the louvre of the indoor unit stays at the horizontal.)
26.8. Indoor thermostat characteristic
1. Thermostat characteristic during cooling and heating modes
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