Daikin REYQ-AATJA Service Manual page 155

SiUS372201EA
7.2.2 Oil Return Operation in Heating Operation
Part name
Compressor motor
Fan motor
Electronic expansion valve (Heat exchanger right upper)
Electronic expansion valve (Heat exchanger right lower)
Electronic expansion valve (Heat exchanger left)
Electronic expansion valve (Subcooling heat exchanger)
Electronic expansion valve (Receiver gas purge)
Electronic expansion valve (Refrigerant cooling IPM)
Electronic expansion valve (Refrigerant cooling air)
Solenoid valve (Oil separator oil return)
Solenoid valve (Liquid shutoff)
Solenoid valve (Accumulator oil return)
Solenoid valve (Refrigerant adjustment)
Solenoid valve (Injection)
Four way valve (Heat exchanger right upper)
Four way valve (Heat exchanger right lower)
Four way valve (Heat exchanger left)
Four way valve (HP/LP gas pipe)
Solenoid valve (Refrigerant cooling bypass)
Ending condition
Indoor unit actuator
Fan
Electronic expansion valve
Branch Selector unit actuator
Electronic Thermostat ON
expansion
Y1E Non-operating
valve
(EVSC)
Thermostat OFF
Electronic Thermostat ON
expansion
Y2E Non-operating
valve
(EVH)
Thermostat OFF
Electronic Thermostat ON
expansion
Y3E Non-operating
valve
(EVL) Thermostat OFF
Part 4 Functions and Control
Electric symbol
M1C, M2C
M1F, M2F
Y1E
Y2E
Y5E
Y3E
Y4E
Y6E
Y7E
Y1S, Y2S
Y3S
Y4S
Y5S
Y6S
Y10S
Y7S
Y9S
Y8S
Y11S
Thermostat ON unit
Non-operating unit
Thermostat OFF unit
Thermostat ON unit
Non-operating unit
Thermostat OFF unit
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
Function of functional part
Constant high pressure control
For heat exchanger mode
Same as normal control
Same as normal control
Same as normal control
Same as normal control
ON
Same as normal control
ON
OFF
Same as normal control
Hold
Same as normal control
A lapse of 6 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
Heating
Subcooling degree control
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
Special Control
Heating
Remote controller setting
OFF
Remote controller setting
Normal control
224 pulse
224 pulse
Normal 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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