Daikin Aurora Series Service Manual page 75

SiUS341802E
7.2.2 Oil Return Operation in Heating Operation
Starting conditions
Part Name
Inverter compressor
Inverter fan
Electronic expansion valve (Heat
exchanger upper)
Electronic expansion valve (Heat
exchanger lower)
Electronic expansion valve (Subcooling
heat exchanger)
Electric expansion valve (Subcooling
injection)
Electronic expansion valve (Refrigerant
cooling)
Electronic expansion valve (Receiver
gas purge)
Solenoid valve (Oil separator oil return) Y1S
Solenoid valve (Hot gas bypass)
Solenoid valve (Liquid pipe)
Four way valve (HP/LP gas pipe)
Four way valve (Heat exchanger lower) Y5S
Four way valve (Heat exchanger upper) Y6S
Solenoid valve (Accumulator oil return) Y7S
Ending condition
Fan
Electronic expansion valve
Functions and Control
Electric Symbol
M1C
M1F, M2F
Y1E
Y3E
Y2E
Y4E
Y5E
Y7E
Y2S
Y3S
Y4S
Indoor unit actuator
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Oil return operation
+1 to +6 steps from frequency to frequency when oil return is IN
at a constant level
Same as normal operation
Same as normal operation
Same as normal operation
Same as normal operation
Same as normal operation
0 pulse
ON
OFF
ON
Hold
Hold
Hold
Same as normal operation
A lapse of 8 minutes while the frequency is more than that of oil
return operation.
Cooling
Remote controller setting
OFF
Remote controller setting
Normal control
224 pulse
Forced thermostat ON
Special Control
Heating
Remote controller setting
OFF
Remote controller setting
Normal control
224 pulse
224 pulse
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