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Special Control
SiUS28-902_a
23
Function
3.2.2 Oil Return Operation in Heating Operation
[Conditions to start]
The heating oil-returning operation is started under the 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, the integrated amount of displaced oil is derived from Tc, Te, and the
compressor load.
* From the preparation of the 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 when changing the position 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>58 psi) time
Outdoor unit fan
STEP 8
OFF
STEP 8
Four-way valve
ON
OFF
ON
Main electronic expansion valve
(EV1)
SH control
1400 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
ON
OFF
Ending conditions
130 sec.
•
6 min.
•
Ts - Te<5
•
160 sec.
•
Pc - Pe>58 psi
or
or
Indoor unit actuator
Heating oil return operation
Fan
Thermostat ON unit
OFF
Stopping unit
OFF
Thermostat OFF unit
OFF
Electronic expansion valve
Thermostat ON unit
500 pls
Stopping unit
500 pls
Thermostat OFF unit
500 pls
Summary of Contents for SkyAir FCQ18PVJU
Page 1: ...Split System Air Conditioners SkyAir Inverter R 410A Heat Pump 60Hz P Series SiUS28 902_a...
Page 44: ...Other Control SiUS28 902_a 37 Function...
Page 81: ...SiUS28 902_a Troubleshooting by Remote Controller Troubleshooting 74...
Page 185: ...SiUS28 902 Precautions for New Refrigerant R 410A Precautions for New Refrigerant R 410A 178...