Branch Selector Unit & Indoor Unit Operation Mode Detail - Daikin REYQ-XA Service Manual

Function General
1.2 Branch Selector Unit & Indoor Unit Operation Mode Detail
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Indoor unit
Electric
Part name
symbol
Indoor fan M1F
Indoor electronic
Y1E
expansion valve
Branch Selector unit
Branch Selector unit actuator
Electronic
expansion valve Y1E
(EVSC)
Electronic
expansion valve Y2E
(EVH)
Electronic
expansion valve Y3E
(EVL)
105
1. The switch for the Branch Selector unit is operated when pressure equalization control turns
ON after cooling/heating mode of other indoor unit is changed or on the timing of oil returns.
2. If 20RH: ON, depend on indoor control (200 pulse).
If 20RH: OFF, 0 pulse.
Normal cooling
Thermostat ON Thermostat OFF
Remote
controller controller
setting
Normal
opening
degree
Thermostat ON
Non-operating
Thermostat OFF
Thermostat ON
Non-operating
Thermostat OFF
Thermostat ON
Non-operating
Thermostat OFF
Stop
Remote
OFF
setting
0 pulse 0 pulse
Normal cooling
Cooling Cooling
0 pulse 0 pulse
0 pulse 0 pulse
0 pulse 0 pulse
6,000 pulse 0 pulse
6,000 pulse 0 pulse
6,000 pulse 0 pulse
6,000 pulse 6,000 pulse
6,000 pulse 6,000 pulse
6,000 pulse 6,000 pulse
Normal heating
Thermostat ON Thermostat OFF
Remote
controller LL
setting
Normal
opening 192 pulse
degree
Normal simultaneous
cooling/heating
Heating
Subcooling
degree control
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
SiUS371901E
Stop
OFF
192 pulse
Normal heating
Heating
0 pulse
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
Functions and Control