Daikin REYQ-AATJA, Service Manual

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SiUS372201EA Special Control
Part 4 Functions and Control 148
7.2.2 Oil Return Operation in Heating Operation
Part name Electric symbol Function of functional part
Compressor motor M1C, M2C Constant high pressure control
Fan motor M1F, M2F For heat exchanger mode
Electronic expansion valve (Heat exchanger right upper) Y1E Same as normal control
Electronic expansion valve (Heat exchanger right lower) Y2E
Electronic expansion valve (Heat exchanger left) Y5E
Electronic expansion valve (Subcooling heat exchanger) Y3E Same as normal control
Electronic expansion valve (Receiver gas purge) Y4E Same as normal control
Electronic expansion valve (Refrigerant cooling IPM) Y6E Same as normal control
Electronic expansion valve (Refrigerant cooling air) Y7E
Solenoid valve (Oil separator oil return) Y1S, Y2S ON
Solenoid valve (Liquid shutoff) Y3S Same as normal control
Solenoid valve (Accumulator oil return) Y4S ON
Solenoid valve (Refrigerant adjustment) Y5S OFF
Solenoid valve (Injection) Y6S Same as normal control
Four way valve (Heat exchanger right upper) Y10S Hold
Four way valve (Heat exchanger right lower) Y7S
Four way valve (Heat exchanger left) Y9S
Four way valve (HP/LP gas pipe) Y8S
Solenoid valve (Refrigerant cooling bypass) Y11S Same as normal control
Ending condition A lapse of 6 minutes while the frequency is more than
that of oil return operation.
Indoor unit actuator Cooling Heating
Fan
Thermostat ON unit Remote controller setting Remote controller setting
Non-operating unit OFF OFF
Thermostat OFF unit Remote controller setting Remote controller setting
Electronic expansion valve
Thermostat ON unit Normal control Normal control
Non-operating unit 224 pulse 224 pulse
Thermostat OFF unit Forced thermostat ON 224 pulse
Branch Selector unit actuator
Normal simultaneous cooling/heating
Normal heating
Cooling Heating
Electronic
expansion
valve
(EVSC)
Y1E
Thermostat ON 0 pulse Subcooling degree control 0 pulse
Non-operating 0 pulse 0 pulse 0 pulse
Thermostat OFF 0 pulse 0 pulse 0 pulse
Electronic
expansion
valve
(EVH)
Y2E
Thermostat ON 0 pulse 6,000 pulse 6,000 pulse
Non-operating 0 pulse 6,000 pulse 6,000 pulse
Thermostat OFF 0 pulse 6,000 pulse 6,000 pulse
Electronic
expansion
valve
(EVL)
Y3E
Thermostat ON 6,000 pulse 0 pulse 0 pulse
Non-operating 6,000 pulse 0 pulse 0 pulse
Thermostat OFF 6,000 pulse 0 pulse 0 pulse