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Special Control
SiEN18-622
102
Function
3.2
Oil Return Operation
Oil flown from the compressor to the side of system is collected by oil-returning operation, in
case of that oil in the compressor runs down.
3.2.1 Oil Return Operation in Cooling Operation
[Conditions to start]
The cooling 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.
Outdoor unit actuator
Oil return preparation
operation
Oil return operation
Post-oil-return operation
Compressor
Take the current step as the
upper limit.
52 Hz Full load
(
→
Low pressure constant
control)
Same as the
“
oil return
operation
”
mode.
Outdoor unit fan
Fan control (Normal cooling) Fan control (Normal cooling) Fan control (Normal cooling)
Four way valve
OFF
OFF
OFF
Main electronic expansion valve
(EV1)
480 pls
480 pls
480 pls
Subcooling electronic expansion
valve (EV3)
SH control
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
OFF
OFF
Ending conditions
20 sec.
•
3 min.
•
Ts - Te<5
°
C
•
3 min.
•
Pe<0.6MPa
•
HTdi>110
°
C
or
or
Indoor actuator
Cooling oil return operation
Indoor unit fan
Thermostat ON unit
Set Air Volume
Stopping unit
OFF
Thermostat OFF unit
Set Air Volume
BP unit electronic expansion
valve
Thermostat ON unit
SH control
Stopping unit
77 pls
Thermostat OFF unit
SH control
Summary of Contents for FTKS50BVMB
Page 1: ...SiEN18 622 E Series Service Manual Applied Models zSuper Multi Plus Cooling Only Heat Pump ...
Page 105: ...Refrigerant Flow for Each Operation Mode SiEN18 622 92 Refrigerant Circuit ...
Page 157: ...Indoor Unit SkyAir Models SiEN18 622 144 Function ...
Page 312: ...SiEN18 622 Ceiling Mounted Cassette Type System Configuration 300 ...
Page 424: ...Method of Replacing The Inverter s Power Transistors Modules SiEN18 622 412 Troubleshooting ...
Page 446: ...Wiring Diagrams SiEN18 622 434 Appendix ...
Page 452: ...SiEN18 622 vi Index ...