SiEBE18-526 Special Control
Function 63
3.2.2 Oil Return Operation in Heating Operation
[Conditions to start]
The heating oil-returning operation is started referring following conditions.
Integrated amount of displaced oil
Timer
(After the power is turned on, integrated operating-time is 2 hours and subsequently every 8
hours.)
In addition, integrated amount of displaced oil is derived from Tc, Te, and the compressor
load.
* From the preparing oil-returning operation to the oil-returning operation, and from the oil-
returning operation to the operation after oil-returning, the compressor stops for 1 minute to
reduce noise on changing of the four way valve.
Outdoor Unit Actuator
Oil return preparation
operation
Oil return operation Post-oil-return operation
Compressor Upper limit control 124 Hz
2-step increase from
52 Hz to
(Pc - Pe>0.4 MPa) time
Outdoor unit fan STEP8 High pressure control STEP8
Four way valve ON OFF ON
Main electronic expansion valve
(EV1)
SH control 2000 pls 200~400 pls
Subcooling electronic expansion
valve (EV2)
0 pls 0 pls 0 pls
Hot gas bypass valve (SVP) OFF ON ON
Receiver gas discharging valve
(SVG)
ON → OFF ON → OFF ON → OFF
Ending conditions 130 sec.
• Max. 735 sec.
• Ts - Te<5
• 160 sec.
• Pc - Pe>0.4MPa
or
or
Indoor actuator Heating oil return operation
Indoor unit fan
Thermostat ON unit OFF
Stopping unit OFF
Thermostat OFF unit OFF
BP unit electronic expansion
valve
Thermostat ON unit SH control
Stopping unit 80 pls
Thermostat OFF unit SH control
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