Defrost Flow Chart; Heating Operation Start : Compressor On - Fujitsu ASTG18KMTC Service Instruction

3. Defrost Flow Chart

The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
1st defrost
Compressor Compressor
integrating
integrating
operation: operation:
Over 22 min. Over 62 min.
Outdoor Outdoor
heat exchanger heat exchanger
temperature: temperature:
Below - 9°C Below - 5°C

Heating operation start : Compressor ON

2nd and later defrost
Compressor integrating
operation:
Over 40 min.
.outside temp. > -10°C
=
Outdoor heat exchanger temp.
< -17°C
.outside temp. < -10°C
1 Outdoor heat exchanger temp.
< -20°C
2 Outdoor heat exchanger temp.
< Outside air temp -7°C.
3 Tn-Tn10< -5°C (and Tn< -6°C)
4 Tn-Tnb< -2°C (and Tn< -6°C)
Defrost start
Defrost Indicator:
[Operation lamp]
6 sec ON / 2 sec OFF
Outdoor heat exchanger temperature:
Over +16°C
or
Compressor ON time: Maximum 15 minutes
Defrost end
01-16
(Not defrosted for 10 minutes)
Compressor
OFF count :
40 times
(Less than 10min.)
Integrating defrost
(Constant monitoring)
Compressor Compressor
integrating integrating
operation: operation:
Over 240 min. Over 215 min.
Outdoor Outdoor
heat exchanger heat exchanger
temperature: temperature:
Below - 3°C Below - 5°C