Daikin REYQ-AATJA, Service Manual, Page: 157 / 495

SiUS372201EA Special Control
Part 4 Functions and Control 150
REYQ192-240AA single system when outside temperature is higher than 0°C (32°F)
Part name Electric symbol Function of functional part
Compressor motor M1C, M2C 135.0 rps + 140.0 rps
Fan motor
M1F, M2F
(Defrosting side)
With high pressure
OFF ↔ Step X/2 ↔ Step X
(Evaporating side)
MAX Step
Electronic expansion valve (Heat exchanger right upper) Y1E (Defrosting side)
100%
(Evaporating side)
Superheat control
Electronic expansion valve (Heat exchanger right lower) Y2E
Electronic expansion valve (Heat exchanger left)
Y5E
Electronic expansion valve (Subcooling heat exchanger) Y3E Discharge temperature control
Electronic expansion valve (Receiver gas purge) Y4E Liquid recovery 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 ON
Solenoid valve (Accumulator oil return) Y4S ON
Solenoid valve (Refrigerant adjustment) Y5S OFF
Solenoid valve (Injection) Y6S ON
Four way valve (Heat exchanger right upper) Y10S (Defrosting side)
OFF
(Evaporating side)
ON
Four way valve (Heat exchanger right lower) Y7S
Four way valve (Heat exchanger left)
Y9S
Four way valve (HP/LP gas pipe) Y8S OFF
Solenoid valve (Refrigerant cooling bypass) Y11S Same as normal control
Ending condition
A lapse of 8 minutes
Tb > 11°C (51.8°F) continues for 60 seconds or more
OR
Indoor unit actuator Cooling Heating
Fan
Thermostat ON unit Remote controller setting OFF
Non-operating unit OFF OFF
Thermostat OFF unit Remote controller setting OFF
Electronic expansion valve
Thermostat ON unit Normal control 0 pulse
Non-operating unit 0 pulse 0 pulse
Thermostat OFF unit 0 pulse 0 pulse
Branch Selector unit actuator Normal cooling
Normal simultaneous cooling/heating
Normal heating
Cooling Heating
Electronic
expansion
valve (EVSC)
Y1E
Thermostat ON 0 pulse 0 pulse
Subcooling degree control
0 pulse
Non-operating 0 pulse 0 pulse 0 pulse 0 pulse
Thermostat OFF 0 pulse 0 pulse 0 pulse 0 pulse
Electronic
expansion
valve (EVH)
Y2E
Thermostat ON 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse
Non-operating 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse
Thermostat OFF 6,000 pulse 0 pulse 6,000 pulse 6,000 pulse
Electronic
expansion
valve (EVL)
Y3E
Thermostat ON 6,000 pulse 6,000 pulse 0 pulse 0 pulse
Non-operating 6,000 pulse 6,000 pulse 0 pulse 0 pulse
Thermostat OFF 6,000 pulse 6,000 pulse 0 pulse 0 pulse