Daikin VRV Inverter K Series - Oil Equalization Control

Outline of Control SiE-05C
228 Functions PLUS Series
4.5 Oil Equalization Control
Because oil could collect in the outdoor units or between inverter outdoor unit and standard outdoor unit 1
outdoor units when only inverter outdoor unit is operating due to the compressor stopping during operation,
oil that collects in standard outdoor unit 1 is returned to inverter outdoor unit.
4.5.1 When Cooling
<Heat Pump
System>
Oil is moved between inverter outdoor unit and standard outdoor unit 1 units by operating then
simultaneously.
When all three systems are operating, however, oil equalization is not executed because oil separation is
not carried out.
Operation conditions
A Time
&
&
2-system operation
At least 20 minutes has elapsed since completing start processing, and at least 20 minutes has
elapsed since oil return.
At least 28 minutes has elapsed since defrost completion.
OR
At least 10 continuous minutes has elapsed since inverter outdoor unit started.
&
INV compressor oil temperature > Te+10˚C
At least 3 minutes has elapsed since inverter outdoor unit started.
At least A Time has elapsed by total operating time of standard outdoor unit 1 since completion of previous
oil equalization operation.
Compressor
P1 control
ON + OFF
OFF
INV
outdoor unit
STD
outdoor unit 1
STD
outdoor unit 2
Outdoor unit fan Outdoor unit EEV
Solenoid valve
for oil discharge
Hot gas bypass
H + ON 2000PLS ON
Low pressure
protection control
H + ON 2000PLS ON
Low pressure
protection control
H + ON 0 PLS OFF ON
Discharge temp.
of any unit > 125˚C
or low pressure < 1.5k
5 minutes elapse
Quit
Stop
Oil return
operation
Return to
normal control
(VF110)
(k:kg/cm²)
16Hp 18Hp 20Hp 24Hp 26Hp 28Hp 30Hp
Cooling 2 hours 2 hours 2 hours 2 hours 2 hours 2 hours 2 hours
Heating 3 hours 3 hours 2 hours 3 hours 3 hours 3 hours 2 hours
SI-05C.BOOK Page 228 Monday, November 6, 2000 4:13 PM
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