Fujitsu ASU9RL - Off Defrost Operation Control; Minimum Heat Operation

20. OFF DEFROST OPEARTION CONTROL
1. OFF DEFROST OPERATION CONDITION
When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat
exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation
lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost,
and then stop.
In heating operation, the outdoor heat exchanger temperature is less than 25
°F(-4°C), and
compressor operation integrating time lasts for more than 30 minutes.
ASU9 / 12RL
OFF Defrost Flow Chart
Heating operation stop
Outdoor heat exchanger temperature:
Below 25
°F(-4°C)
and
Compressor integrating operation:
Over 30 minutes
Defrost start
Defrost Indicater:
[Operation lamp]
7 sec ON / 2 sec OFF
Outdoor heat exchanger temperature:
Over 61
°F(16°C) or
Compressor ON time: Over 15 minutes
Defrost end
2. OFF DEFROST END CONDITION
Release Condition
Outdoor heat exchanger temperature sensor value is higher than
61
°F(16°C) or Compressor operation time has passed 15 minutes.
05-16
21. MINIMUM HEAT OPERATION
The MINIMUM operation functions by pressing MINIMUM HEAT button on the remote controller.
The MINIMUM operation is almost the same operation as below settings.
mode HEAT
setting temperature 50
°F(10°C)
fan mode AUTO
( Table 16 )