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4.9.2 FROST ADHERENCE DETECTION (1)
If the following conditions are satisfied during heating operations, it is regarded as "frost adherence is detected".
• Frost adherence detection is performed in accordance with the outdoor air temperature (TO) and the outdoor
heat exchanger temperature sensor (C1).
Note
: Frost adherence detection is not performed for the first 15-minute of compressor operations in the normal
heating mode.
• Frost adherence detection conditions
(a) With the outdoor air temperature (TO) being -13°C or above, the frost adherence condition shown
below are satisfied for whether 3 consecutive minutes or a total of 60 intermittent minutes, or the
outdoor heat exchanger temperature sensor (C1) remains -18°C or below for 20 consecutive
seconds.
(b) With the outdoor air temperature (TO) being less than -13°C, the outdoor heat exchanger
temperature sensor:
(C1) ≤ [(TO) – 5°C] for 20 consecutive seconds → Defrosting condition
(c) With the outdoor heat exchanger temperature sensor (C1) being less than -3°C, a total of 90 minutes
has elapsed (defrosting carried out periodically in accordance with the time).
4.9.3 HEATING MASK TIME (2)
This refers to the shortest time that heating operations must be performed without defrosting operations being
executed.
The mask time for this model is 25 minutes.
Note
: Defrosting operations will not be commenced until the defrosting mask time has elapsed, even if frost
adherence has been detected.
4.9.4 DEFROST CYCLE END (3)
Defrosting operations are ended when the following conditions are aligned:
(a) When the temperature of the outdoor heat exchanger temperature sensor (C1) is 12 or higher.
(b) When the temperature of the outdoor heat exchanger temperature sensor (C1) is 7 or higher for
60 consecutive seconds.
(c) When defrosting has been initiated for 10 minutes.
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