Defrost Operation - Daikin SkyAir GQI-Eco Series Service Manual

SiBE281013
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.
∗

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
Function and Control
The more the unit operates at low frequency, the higher the frequency of oil recovery
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.
-5
-20 -15 -10
-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 15
5
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 area
-25
-30
When quick
defrost starting is
set
40 minutes
40 minutes
Function Details
Outdoor temperature (˚C)
When slow defrost
Factory setting
starting is set
2 hours 6 hours
6 hours 8 hours
45