Oil Return Operation - Daikin Super Multi Plus E-Series FTXG25EV1BW Service Manual

SiBE18-821_C
3.2

Oil Return Operation

In order to prevent the compressor from running out of oil, the oil return operation is conducted
to recover oil flown out from the compressor to the system side.
3.2.1 Oil Return Operation in Cooling Operation
[Conditions to start]
Referring to the set conditions for the following items, start the oil return operation in cooling.
Furthermore, the cumulative oil feed rate is computed from Tc, Te, and compressor loads.
Outdoor unit actuator
Compressor
Outdoor fan
Four way valve (Y1S)
Main electronic expansion valve
(Y1E)
Subcooling electronic expansion
valve (Y3E)
Hot gas bypass valve (Y2S)
Ending conditions
Indoor fan
Electronic expansion valve of
BP unit
Function
Cumulative oil feed rate
Timer setting (Make this setting so as to start the oil return operation when the initial
cumulative operating time reaches 2 hours after power supply is turned ON and then every
eight hours.)
Oil return preparation
operation
Take the current step as the
upper limit.
Fan control (Normal cooling) Fan control (Normal cooling) Fan control (Normal cooling)
OFF
480 pls
SH control
OFF
20 sec.
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit

Oil return operation

52 Hz Full load (→ Low
pressure constant control)
OFF
480 pls
0 pls
OFF
• 3 min.
or
• Ts – Te < 5°C
Cooling oil return operation
Remote controller setting
Remote controller setting
Special Control
Post-oil-return operation
"
Same as the oil return
"
operation mode.
OFF
480 pls
0 pls
OFF
• 3 min.
• Pe < 0.6 MPa
or
• HTdi > 110°C
OFF
SH control
77 pls
SH control
83