Daikin RXYQ-TA Series Service Manual page 82

Special Control
7.3.2 Oil Return Operation in Heating
Starting conditions
Part Name
Inverter compressor 1
Inverter compressor 2
Inverter fan 1
Inverter fan 2
Electronic expansion valve
(Main)
Electronic expansion valve
(Injection)
Four way valve
Solenoid valve
(Accumulator oil return)
Solenoid valve (Oil return 1)
Solenoid valve (Oil return 2)
Ending conditions
: equipped
–: not equipped
∗1: RXYQ96/120TA only
Fan
Electronic expansion valve
69
Electric Symbol RXYQ72-120TA RXYQ144/168TA
M1C
M2C
M1F
M2F
Y1E
Y2E
Y1S
Y2S
Y3S
Y4S
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
—
∗1
( )
—
OFF
OFF
OFF
Oil return EV opening degree
Oil return EV opening degree
Oil return EV opening degree
SiUS341615E
Function of Functional Part
RXYQ72TA: 266 Hz
RXYQ96/120TA: 188 Hz
RXYQ144/168TA: 252 Hz + 252 Hz
With high pressure
OFF ←→ Step 4 ←→ Step 6
RXYQ72TA: 480 pulses
RXYQ96-168TA: 3,000 pulses
0 pulse
OFF
ON
ON
• A lapse of 6 min.
OR
• Ts1 – Te < 3°C (5.4°F)
Heating oil return operation
Functions and Control