5-8. Defrosting Operation (Heating)
- Reverse-cycle Defrosting
Defrosting Sequence
Heating Operation
-
compressor
ON
-
4-way valve
ON
Frost Detection
Frosting is assumed mostly under the following condition
-
indoor heat exchanger coil temperature drops 0,8°c
per 6 minutes and it repeats 3 times in succession
-
integrated operating time of compressor is longer
than 3 hours
-
temperature of indoor heat exchanger coil, immediately
before thermo goes off, is below
Td
+5,6°C, etc
NOTE:
The values shown as Td differs according to the models
Td
Reverse-cycle defrosting operation
-
compressor
ON
-
outdoor fan
OFF
-
4-way valve
OFF
-
indoor fan
cold draft prevention mode
Releasing of defrosting
-
Defrosting operation lasts 8 to 12 minutes (max)
-
compressor current during reverse-cycle defrosting
operation exceeds certain ampere
9000 BTU/h
38°C
12000 BTU/h
44°C
20