Fujitsu AOYG45LAT8 User Manual page 34

1-18. DEFROST OPERATION CONTROL
1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts as shown in the following Table 16, 17 and 18.
( Table 16 : Condition of normal defrost operation)
Does not operate
Normal defrost
( Table 17 : Condition of integrating defrost operation)
Integrating defrost
Does not operate
( Table 18 : Condition of Integrating (OFF count) defrost operation)
Integrating defrost
(OFF count defrost)
If any defrost operated, "compressor integrating operation time" and "compressor OFF count" are cleared.
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions becomes as shown in Table 19.
( Table 19 : Condition of defrost release )
Outdoor heat exchanger temperature is higher than
Compressor operation time has passed 15 minutes.
Less than
35 minutes
Compressor integrating operation time
Less than
210 minutes
Outdoor temperature
Compressor continuous operation time
Less than 10 minutes
Outdoor temperature
and
Compressor OFF count : 40 times
Release Condition
or
Compressor integrating operation time
Over 35 minutes
Outdoor temperature -10°C
Heat exchanger temperature
Outdoor temperature -10°C
Heat exchanger temperature
Outdoor temperature
Heat exchanger temperature
Over 210 minutes
Compressor stop
and
< =
2°C
< =
2°C
12°C
01-33
> =
and
< =
-17°C
>
and
< =
-7°C
> -10°C
and
< = -20°C
Over 240 minutes
Outdoor unit
< =
heat exchanger -3°C
temperature