AE-XM24CR (serv.man8). Functions - Sharp Air Conditioner Service Manual (repair manual). Page 10

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(2) Defrosting

If the compressor operation time is more than 20
minutes in the heating mode and the outdoor air
temperature and outdoor heat exchange
temperature satisfy the defrosting conditions, the
defrosting operation is started.
When the defrosting operation is started, the indoor
fan starts to run intermittently.
When the outdoor heat exchanger temperature
reaches approx. 15 ˚C or above or when the
defrosting time exceeds 10minutes, the defrosting
operation is quit.

(3) During defrosting

When defrosting begins, the compressor stops.
Approximately 1 minutes later, the compressor
reactivates in the refrigeration cycle, and the outdoor
heat exchanger is defrosted.
Each mode is as follows:
The outdoor fan is stopped
The operating frequency is as shown in the
table below
The indoor fan is stopped
All expontion valve are open.

(4) Defrost stop

When defrosting time exceeds 10 minutes
When the temperature of the outdoor heat
exchanger rises above approximately 15 ˚C
Defrost stop is determined by either of the
above conditions, and the compressor is
stopped.
At the same time, the outdoor fan go ON.
The compressor is reactivated in the heating
cycle 1 minutes after it was stopped, and
normal control resumes.

Preheat operation is that supplies a small
amount of power to the compressor to make
heating start more quickly.
When outdoor temperature lowers below 5 ˚C
and compressor temperature lowers below
20 ˚C, Preheat Operation starts.
After that, if outdoor temperature rises 8 ˚C or
compressor temperature rises 25 ˚C, Preheat
Operation stops.

More than  

20 min.

More than  

20 min.

Defrosting
Max. 10 min.

Heating 
operation 
start

Defrosting
Max. 10 min.

More than 

20 min.

AE-XM18CR/AE-XM24CR

Model

Frequency

90Hz