Function Details
3.2.25 Oil Recovery Operation
When the compressor runs at low frequency for a long time, the failure of recovering oil may
cause the shortage of oil level. Therefore, the oil recovery operation is performed by increasing
the compressor operation frequency for five minutes.
The more the unit operates at low frequency, the higher the frequency of oil recovery
3.2.26 Defrost Operation
When in heating mode, a defrost operation will be conducted in order to avoid ice formation on
the outdoor unit heat exchanger.
Starting Conditions
Defrost will start when the following conditions have been realized:
&
Defrost conditions
Defrost upper limit A
Depending on the defrost start setting (field setting mode of the indoor unit remote controller),
frost upper limit time A becomes as shown in the table below.
Outdoor air temperature > -5°C
Outdoor air temperature -5°C
114
operation becomes.
• Integrated compressor running time is 25 minutes or more since the completion of the
previous defrost operation.
OR
• Defrost upper limit time A is met.
• Outdoor unit heat exchanger temperature is within the defrost request area.
-20
-15
-10
-5
-7
-4
-5
-6
-8
-7
-8
-9
-10
-11
-12
-13
-14
Defrost permit
-16
-17
area
-19
-21
-23
-24
-27
-28
Outdoor unit heat exchanger temperature (°C)
5
When slightly quick defrost starting is set (Permit)
2
0
10
5
15
Factory setting (Permit)
-3
-1
-1
When slightly quick defrost starting is set (Request)
-2
-4
When slightly slow defrost starting is set (Permit)
-5
Factory setting (Request)
-6
-8
When slightly slow defrost starting is set (Request)
-10
-11
-7
-15
Defrost request
-20
-25
-30
When quick
defrost starting is
set
40 minutes
40 minutes
Outdoor temperature (°C)
When slow defrost
Factory setting
starting is set
2 hours
6 hours
6 hours
8 hours
Function and Control
ESIE12-06