Basic Control; Normal Control - Daikin REYQ-XA Service Manual

SiUS371901E

5. Basic Control

5.1

Normal Control

Part name
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)
Solenoid valve (Hot gas bypass)
Solenoid valve (Liquid shutoff)
Four way valve (HP/LP gas
pipe)
Four way valve (Heat
exchanger lower)
Four way valve (Heat
exchanger upper)
Solenoid valve
(Accumulator oil return)
Branch Selector unit actuator
Electronic
expansion Y1E
valve (EVSC)
Electronic
expansion Y2E
valve (EVH)
Electronic
expansion Y3E
valve (EVL)
Functions and Control
Electric symbol
Normal cooling
PI control, High
pressure protection,
Low pressure
M1C
protection,
Td protection,
Inverter protection
M1F, M2F Cooling fan control
Subcooling degree
Y1E
control
Subcooling degree
Y3E control (0 pulse in low
load)
Superheating degree
Y2E control (discharge pipe
protection)
Compressor injection
Y4E
control
Cooling refrigerant
Y5E
control
Y7E 0 pulse
Y1S ON
Y2S OFF
Y3S ON
Y4S ON
Y5S OFF (ON in low load)
Y6S OFF
Y7S ON
Normal cooling
Thermostat ON 0 pulse
Non-operating 0 pulse
Thermostat OFF 0 pulse
Thermostat ON 6,000 pulse
Non-operating 6,000 pulse
Thermostat OFF 6,000 pulse
Thermostat ON 6,000 pulse
Non-operating 6,000 pulse
Thermostat OFF 6,000 pulse
Function
Normal heating
PI control, High
pressure protection,
Low pressure
protection,
Td protection,
Inverter protection
Outdoor heat
exchanger: Condenser /
Cooling fan control
Outdoor heat
exchanger: Evaporator /
Fan step 7 or 8
Superheating degree
control (Subcooling
degree control in low
load)
Superheating degree
control (0 pulse in low
load)
Superheating degree
control (discharge pipe
protection)
Compressor injection
control
Cooling refrigerant
control
Gas purge control
ON
OFF
ON
OFF
ON
ON (OFF in low load)
ON
Normal simultaneous
cooling/heating
Cooling Heating
Subcooling
0 pulse
degree control
0 pulse 0 pulse
0 pulse 0 pulse
0 pulse 6,000 pulse
0 pulse 6,000 pulse
0 pulse 6,000 pulse
6,000 pulse 0 pulse
6,000 pulse 0 pulse
6,000 pulse 0 pulse
Basic Control
Normal simultaneous
cooling/heating
PI control, High
pressure protection,
Low pressure
protection,
Td protection,
Inverter protection
Outdoor heat
exchanger: Condenser /
Cooling fan control
Outdoor heat
exchanger: Evaporator /
Fan step 7 or 8
Subcooling degree
control (when HE is
evaporator)
Superheating degree
control (when HE is
condenser)
Superheating degree
control (discharge pipe
protection)
Compressor injection
control
Cooling refrigerant
control
Gas purge control
ON
OFF
ON
OFF
OFF (In cooling)
ON (In heating)
OFF (In cooling)
ON (In heating)
ON
Normal heating
0 pulse
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
110