Oil Recovery Operation - Daikin SkyAir Service Manual

SiBE28-804
Heating High outdoor ambient (overload conditions):
In heating overload conditions, the outdoor fan speed will be adapted to secure the differential
pressure between high and low pressure.
Only the fan speed will be adapted in heating overload conditions.
No adjustments to the compressor frequency will be made.

4.12 Oil Recovery Operation

Outline When the compressor operates for a certain period of time at low frequency, the oil level in the
compressor may become low due to incomplete oil return.To prevent damage to the
compressor and in worst case avoid compressor lock, an oil recovery operation will be
conducted.
Details During the oil recovery operation, the operation frequency of the compressor will be increased
for a time period of 5 minutes.Oil recovery operation is only executed in cooling mode.In heating
mode, oil return to the compressor is guaranteed by the defrost operation.
Functional Description
RZQ100~140C7, RZQS125·140C7V1B
•Hp-Lp < 0.39MPa
OR
•Hp > 3.43MPa
Outdoor unit fan
–1 step/30 sec
RZQ71C7, RZQ71·100C7V1B
•Hp-Lp < 0.39MPa
&
OR
•Hp > 3.14MPa
Outdoor unit fan
–1 step/30 sec
Normal operation
OR
•Hp-Lp > 0.59MPa
•Hp < 3.33MPa
Outdoor unit fan
Normal operation
OR
•Hp-Lp > 0.59MPa
•Hp < 3.04MPa
Outdoor unit fan
Frequency Regulating Functions
•Hp-Lp > 0.69MPa
•HP < 3.24 MPa
•&
•Outdoor unit fan = 8 step
•OR
•Hp-Lp > 1.08MPa
•&
•Hp < 3.24MPa
•&
•Outdoor unit fan = 8 step
•OR
•HP < 2.75MPa
•LP<0.12MP
+1 step/30 sec
•Hp-Lp > 0.69MPa
•&
•Hp < 2.94MPa
•Outdoor unit fan = 8 step
•OR
•Hp-Lp > 1.08MPa
•&
•Hp < 2.94MPa
•&
•Outdoor unit fan = 8 step
•OR
•HP < 2.45MPa
•LP<0.12MP
+1 step/30 sec
77