Outline of Control
SiE-05C
230
Functions PLUS Series
4.5.2
When Heating
Oil level between both units is equalized in 2 steps: oil transfer from INV outdoor unit to STD outdoor unit 1,
and STD outdoor unit 1 to INV outdoor unit.
When all three systems are operating, however, oil equalization is not executed because oil separation is
not carried out.
Operation conditions
&
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 the INV outdoor unit started.
&
INV compressor oil temperature > Te+10˚C
At least 3 continuous minutes has elapsed since INV outdoor unit started.
OR
At least A Time has elapsed by total operating time of STD outdoor unit since completion of previous
oil equalization operation.
The standard type 1 compressor has start/stopped and defrost has been executed B Times since
completion of previous oil equalization operation.
Compressor
38 + OFF
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
1000PLS
ON
Low pressure
protection control
H + ON
0 PLS
OFF
Low pressure
protection control
H + ON
0 PLS
OFF
ON
Tc > 55˚C
5 minutes elapse
Step 1 complete
Stop
Oil return
operation
Return to
normal control
Step 1 : Oil collected in inverter type is returned to STD outdoor unit 1.
(VF112)
(k:kg/cm²)
SI-05C.BOOK Page 230 Monday, November 6, 2000 4:13 PM
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