SiE-05C
Outline of Control
Functions PLUS Series
225
4.3
Oil Return Control
In order to recover refrigeration oil, when total compressor operation capacity equals the reference values,
the capacity is increased, all solenoid valves in the system are fully opened and the oil is recovered at each
compressor.
4.3.1
Conditions for Executing Oil Control
Total compressor operating time = point when approx. 8 hours elapses (Differs somewhat according to
operation status.)
<Heat Pump System>
Operating contents
When cooling
When heating
Step 1: Collected oil is recovered.
Compressor
EEV
Outdoor unit fan
Outdoor unit heat exchanger
Solenoid valve for oil discharge
Injection
Hot gas
INV outdoor unit
STD outdoor unit 1
STD outdoor unit 2
Condenser
Condenser
Condenser
Outdoor unit suction pipe temp.
≤
Te + 10˚C
at when either 6 min. or 4 min. elapses.
Step 2: Refrigerant is discharged from accumulator.
(106Hz + ON)
2000pls
2000pls
2000pls
H + ON
H + ON
H + ON
OFF
ON + OFF
ON + OFF
ON + OFF
OFF
(ON + ON)
(ON + ON)
+
+
Compressor
EEV
Outdoor unit fan
Outdoor unit heat exchanger
Solenoid valve for oil discharge
Injection
Hot gas
INV outdoor unit
STD outdoor unit 1
STD outdoor unit 2
Condenser
Condenser
Condenser
(60Hz + ON)
SH control
H + ON
H + ON
H + ON
ON
ON + OFF
ON + OFF
ON + OFF
ON at Lp < 1.0 k
(ON + OFF)
(ON + OFF)
+
+
Compressor
EEV
Outdoor unit fan
Outdoor unit heat exchanger
Solenoid valve for oil discharge
Injection
Hot gas
INV outdoor unit
STD outdoor unit 1
STD outdoor unit 2
Condenser
Condenser
Condenser
(38Hz + ON)
2000pls
2000pls
2000pls
H + ON
H + ON
H + ON
ON
ON + OFF
ON + OFF
ON + OFF
ON
(ON + OFF)
(ON + OFF)
+
+
Compressor
EEV
Outdoor unit fan
Outdoor unit heat exchanger
Solenoid valve for oil discharge
Injection
Hot gas
INV outdoor unit
STD outdoor unit 1
STD outdoor unit 2
Condenser
Condenser
Condenser
(106Hz + ON)
2000pls
2000pls
2000pls
H + ON
H + ON
H + ON
ON
ON + OFF
ON + OFF
ON + OFF
OFF
(ON + ON)
(ON + ON)
+
+
Compressor
EEV
Outdoor unit fan
Outdoor unit heat exchanger
Solenoid valve for oil discharge
Injection
Hot gas
INV outdoor unit
STD outdoor unit 1
STD outdoor unit 2
Evaporator
Evaporator
Evaporator
(60Hz + OFF)
SH control
H + ON
H + ON
H + ON
OFF
ON + OFF
ON + OFF
ON + OFF
ON at Lp < 2.5 k
(ON + OFF)
(ON + OFF )
+
+
Step 1: 4-way valve switched (30 sec. after start)
Preparation
for oil return
1 minute
elapses
Upper limit frequency
limited to 38 Hz + ON
Liquid refrigerant collected in
indoor unit returned to receiver
Step 2: Collected oil is recovered.
Step 3: Refrigerant is discharged from accumulator. (3 minutes)
30 seconds elapse
Outdoor unit suction pipe temp.
≤
Te + 10˚C
at when either 6 min. or 4 min. elapses.
3 minutes
elapses or
HP > 21k
Quit
3 minutes elapses
or suction
pressure < 1.0
Quit
(k:kg/cm
2
)
(VF107)
SI-05C.BOOK Page 225 Monday, November 6, 2000 4:13 PM
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