
Special Control
SiUS281811EA
112
Part 4 Functions and Control
3.2 Oil
Return
Control
In order to prevent the compressor from running out of oil, oil return control is conducted to recover
oil that has flowed out from the compressor to the system side.
HTdi : Compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature
Pe : Low pressure sensor detection value
Tc: High pressure equivalent saturation temperature
Te: Low pressure equivalent saturation temperature
Ts1: Suction pipe temperature detected by thermistor R3T
3.2.1 Oil Return Control in Cooling
Starting conditions
Oil return operation is not conducted before 2 hours have elapsed from the activation of power
supply.
After 2 hours have elapsed, oil return operation starts when the following item meets the
reference value.
Total amount of oil discharged from the compressor (The total amount of oil discharged from
the compressor is computed from Tc, Te, and compressor loads.)
Oil return operation starts every 8 hours of cumulative operation of the compressor, even if the
reference value is not met.
Outdoor unit
actuator
Electric Symbol
Oil return preparation
control
Oil return control
Control after oil return
18/24
class
30/36/42/48
class
Compressor
M1C
M1C
Take the current step as
the upper limit.
Minimum frequency
(
→
Low pressure
protection control)
Same as oil return
control.
Outdoor fan
M1F
M1F
M2F
Fan control (Normal
cooling)
Fan control (Normal
cooling)
Fan control (Normal
cooling)
Main electronic
expansion valve
Y1E
Y1E
480 pulse (Fully open)
480 pulse (Fully open)
480 pulse (Fully open)
Subcooling
electronic
expansion valve
—
Y3E
SH control
0 pulse
0 pulse
Four way valve
Y1S
Y1S
OFF
OFF
OFF
Hot gas bypass
valve
Y2S
—
OFF
OFF
OFF
Ending conditions
20 seconds
x
3 minutes
x
Ts1 – Te < 5
q
C (9
q
F)
OR
x
3 minutes
x
Pe < 0.6 MPa (87 psi)
x
HTdi > 110°C (230°F)
OR
Indoor unit actuator
Cooling oil return control
Fan
Thermostat ON unit
Remote controller setting
Non-operating unit
OFF
Thermostat OFF unit
Remote controller setting
Electronic expansion valve
Thermostat ON unit
Normal opening
Non-operating unit
224 pulse
Thermostat OFF unit
Normal opening with forced thermostat ON
Содержание SkyAir RZR-TA Series
Страница 1: ...Service Manual Cooling Only 60 Hz Heat Pump 60 Hz RZR TA RZQ TA Series SiUS281811EA...
Страница 202: ...SiUS281811EA 196 Part 6 Service Diagnosis 5 15 Fan Motor Connector Check for FTQ TA 311...
Страница 321: ...SiUS281811EA 315 Part 7 Appendix 1 Wiring Diagrams 316 1 1 Outdoor Unit 316 1 2 Indoor Unit 320 Part 7 Appendix...
Страница 322: ...Wiring Diagrams SiUS281811EA 316 Part 7 Appendix 1 Wiring Diagrams 1 1 Outdoor Unit RZR18 24TAVJU RZQ18 24TAVJU 3D115455...
Страница 323: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 317 RZR18 24TAVJUA RZQ18 24TAVJUA 3D124495...
Страница 324: ...Wiring Diagrams SiUS281811EA 318 Part 7 Appendix RZR30 36 42 48TAVJU RZQ30 36 42 48TAVJU 3D115456...
Страница 325: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 319 RZR30 36 42 48TAVJUA RZQ30 36 42 48TAVJUA 3D124500...
Страница 326: ...Wiring Diagrams SiUS281811EA 320 Part 7 Appendix 1 2 Indoor Unit FCQ18 24 30 36 42 48TAVJU 3D115647A...
Страница 327: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 321 FHQ18 24 30PVJU FHQ36 42MVJU 3D048116C...
Страница 328: ...Wiring Diagrams SiUS281811EA 322 Part 7 Appendix FAQ18 24TAVJU 3D114844B...
Страница 329: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 323 FBQ18 24 30 36 42 48PVJU 3D065984J...