Off Defrost Operation Control; Minimum Heat Operation - Fujitsu ASU9RL Service Instruction

20. OFF DEFROST OPEARTION CONTROL
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.
1. OFF DEFROST OPERATION CONDITION
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.
2. OFF DEFROST END CONDITION
ASU9 / 12RL
Outdoor heat exchanger temperature sensor value is higher than
61°F(16°C)
OFF Defrost Flow Chart
Outdoor heat exchanger temperature:
Below
and
Compressor integrating operation:
Over 30 minutes
Outdoor heat exchanger temperature:
Over 61°F(16°C) or
Compressor ON time: Over 15 minutes
21. MINIMUM HEAT OPERATION
The MINIMUM operation functions by pressing
The MINIMUM operation is almost the same operation as below settings.
( Table 16 )
mode
setting temperature
fan mode
Release Condition
or Compressor operation time has passed 15 minutes.
Heating operation stop
25°F(-4°C)
Defrost start
Defrost Indicater:
[Operation lamp]
7 sec ON / 2 sec OFF
Defrost end
HEAT
50°F(10°C)
AUTO
MINIMUM HEAT button on the remote controller.
05-16