Special Control SiBE18-821_C
84 Function
3.2.2 Oil Return Operation in Heating Operation
[Conditions to start]
The heating oil-returning operation is started referring following conditions.
îš„
Integrated amount of displaced oil
îš„
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 preparation to the oil return operation, and from the oil return operation to the post-
oil-return operation, 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 140 Hz Full load
2-step increase from
36 Hz Unload to (Pc –
Pe > 0.4 MPa) every
20 sec.
Outdoor fan STEP 8 OFF STEP 8
Four way valve (Y1S) ON OFF ON
Main electronic expansion valve
(Y1E)
SH control 480 pls 55 pls
Subcooling electronic expansion
valve (Y3E)
0 pls 0 pls 0 pls
Hot gas bypass valve (Y2S) OFF OFF OFF
Ending conditions 2 min.
• 12 min.
• Ts1 – Te < 5°C
• Tb > 11°C
• 160 sec.
• Pc – Pe > 0.4 MPa
or
&
{
or
Indoor unit actuator Heating oil return operation
Indoor fan
Thermostat ON unit OFF
Stopping unit OFF
Thermostat OFF unit OFF
Electronic expansion valve of
BP unit
Thermostat ON unit SH control
Stopping unit 80 pls
Thermostat OFF unit SH control
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