Daikin Super Multi Plus E-Series FTXG25EV1BW Service Manual page 96

Special Control
3.2.2 Oil Return Operation in Heating Operation
[Conditions to start]
The heating oil-returning operation is started referring following conditions.
In addition, integrated amount of displaced oil is derived from Tc, Te, and the compressor load.
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
* 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.
Indoor fan
Electronic expansion valve of
BP unit
84
Integrated amount of displaced oil
Timer
(After the power is turned on, integrated operating-time is 2 hours and subsequently every
8 hours.)
Oil return preparation
operation
Upper limit control
STEP 8
ON
SH control
0 pls
OFF
2 min.
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Oil return operation
140 Hz Full load
OFF
OFF
480 pls
0 pls
OFF
• 12 min.
or • Ts1 – Te < 5°C
{
&
• Tb > 11°C
Heating oil return operation
SiBE18-821_C
Post-oil-return operation
2-step increase from
36 Hz Unload to (Pc –
Pe > 0.4 MPa) every
20 sec.
STEP 8
ON
55 pls
0 pls
OFF
• 160 sec.
or
• Pc – Pe > 0.4 MPa
OFF
OFF
OFF
SH control
80 pls
SH control
Function