Specifications

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56
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(5) Defrosting
(a) When the following conditions are met, the defrosting operation will start.
1) During normal operation
a) When 40 minutes has passed since the start of heating or 40 minutes after the last defrosting (based on cumulative
operation time of compressor).
b) When the outdoor heat exchanger sensor (Tho-R) temperature is –2 °C or less for 3 continuous minutes after 37
minutes have passed.
c) Outdoor temperature sensor (Tho-A) – outdoor heat exchanger sensor (Tho-R) temperature
>
=
0.44 × outdoor tempera-
ture sensor (Tho-A) temperature + A °C
A = Outdoor temperature
>
=
– 2 °C: 4, outdoor temperature < – 2 °C: 6.
d) When the compressor is operating.
u Or, during heating, defrosting will start when the decision speed counts zero (0) rps for 10 times or more and all
conditions in a), b) and d) above and when the outdoor air temperature is 3°C or less have been satisfied.
2) During defrosting acceleration
a) When 40 minutes has passed since the last defrosting (based on cumulative operation time of compressor).
b) When the compressor is operating.
u Or, during heating, defrosting will start when the decision speed counts zero (0) rps for 10 times or more and all
conditions in a) and b) have been satisfied.
Note (1) Defrosting acceleration is when the finishing of the previous defrosting is according to the defrosting conditions of the 10 minutes that
have passed.
3) Conditions for finishing defrosting
When any of the following conditions is met, the defrosting finishing operation will start.
1 When the temperature of the outdoor heat exchanger sensor (Tho-R) is 20 °C or more.
2 When 10 minutes has passed after the start of defrosting.
3 When the temperature at the outdoor heat exchanger sensor (Tho-R) is 10 (18)°C or higher continuously for 2 (1)
minutes.
Note (1) Values in ( ) are for 40 and 80 type.