Daikin REYQ-TA Series Service Manual page 95

SiUS371614E
7.2.2 Oil Return Operation in Heating Operation
Starting conditions
Part Name
Inverter compressor 1
Inverter compressor 2
Inverter fan
Electronic expansion valve (Heat
exchanger upper)
Electronic expansion valve (Heat
exchanger lower)
Electronic expansion valve
(Subcooling heat exchanger)
Electronic expansion valve
(Receiver gas purge)
Electronic expansion valve
(Inverter cooling)
Solenoid valve (Oil separator oil
return)
Solenoid valve (Liquid pipe)
Four way valve (HP/LP gas pipe) Y4S
Four way valve (Heat exchanger
lower)
Four way valve (Heat exchanger
upper)
Ending condition
Fan
Electronic expansion valve
∗1. DOAS connection
Note:
Branch selector unit actuator
Electronic
expansion valve Y1E
(EVSC)
Electronic
expansion valve Y2E
(EVH)
Electronic
expansion valve Y3E
(EVL)
Functions and Control
Electric Symbol
REYQ72TA
M1C
—
M1F
Y1E
Y3E
Y2E
Y4E
Y5E
Y1S
Y3S
Y5S
Y6S
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON
Stopping
Thermostat OFF
Thermostat ON
Stopping
Thermostat OFF
Thermostat ON
Stopping
Thermostat OFF
REYQ96-168TA
M1C
+1 to +6 steps from frequency to frequency when oil
return is IN at a constant level
M2C
M1F, M2F Same as normal operation
Y1E
Same as normal operation
Y3E
Y2E Same as normal operation
Y4E 0 pulse
Y5E Same as normal operation
Y1S, Y2S ON
Y3S ON
Y4S Hold
Y5S Hold
Y6S Hold
A lapse of 8 minutes while the frequency is more than
that of oil return operation.
Remote controller setting
OFF
Remote controller setting
Normal control
224 pulse
Forced thermostat ON
Normal Simultaneous Cooling / Heating
Cooling
0 pulse
0 pulse
0 pulse
0 pulse
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
Oil return operation
Cooling
Remote controller setting
OFF
Remote controller setting
Normal control
224 pulse / 544 pulse (∗1)
224 pulse / 544 pulse (∗1)
Heating
Subcooled degree
control
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
Special Control
Heating
Normal heating
Heating
0 pulse
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
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