Basic Control; Normal Operation - Daikin REYQ-TA Series Service Manual

Basic Control

5. Basic Control

5.1

Normal Operation

Part Name
Inverter compressor
Inverter fan
Electronic expansion valve
(Heat exchanger upper)
Electronic expansion valve
(Heat exchanger lower)
Electronic expansion valve
(Subcooling heat
exchanger)
Electronic expansion valve
(Receiver gas purge)
Electronic expansion valve
(Inverter cooling)
Solenoid valve (Oil
separator oil return)
Solenoid valve (Liquid pipe) Y3S
Four way valve (HP/LP gas
pipe)
Four way valve (Heat
exchanger lower)
Four way valve (Heat
exchanger upper)
Branch selector unit actuator
Electronic
expansion valve Y1E
(EVSC)
Electronic
expansion valve Y2E
(EVH)
Electronic
expansion valve Y3E
(EVL)
63
Electric Symbol
REYQ
REYQ72TA
96-168TA
M1C M1C, M2C
M1F M1F, M2F
Y1E Y1E
Y3E Y3E
Y2E Y2E
Y4E Y4E
Y5E Y5E
Y1S Y1S, Y2S
Y3S
Y4S Y4S
Y5S Y5S
Y6S Y6S
Normal cooling
Thermostat ON
Stopping
Thermostat OFF
Thermostat ON
Stopping
Thermostat OFF
Thermostat ON
Stopping
Thermostat OFF
Function of Functional Part
Normal Cooling
PI control, High
pressure protection,
Low pressure
protection, Td
protection, Inverter
protection,
Cooling fan control
Subcooled degree
control
Subcooled degree
control (0 pulse in
low load)
Superheated degree
control (discharge
pipe protection)
0 pulse
Cooling refrigerant
control
ON
ON
ON
OFF (ON in low load) ON
OFF
Normal Simultaneous 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
Cooling / Heating
PI control, High PI control, High
pressure protection, pressure protection,
Low pressure Low pressure
protection, Td protection, Td
protection, Inverter protection, Inverter
protection, protection,
Outdoor heat Outdoor heat
exchanger: exchanger:
Condenser / Condenser /
Cooling fan control Cooling fan control
Outdoor heat Outdoor heat
exchanger: exchanger:
Evaporator / Fan Evaporator / Fan
step 7 or 8 step 7 or 8
Superheated degree
Subcooled degree
control (Subcooled
control (when HE is
degree control in low
evaporator)
load)
Superheated degree
Superheated degree
control (when HE is
control (0 pulse in
condenser)
low load)
Superheated degree Superheated degree
control (discharge control (discharge
pipe protection) pipe protection)
Gas purge control Gas purge control
Cooling refrigerant Cooling refrigerant
control control
ON ON
ON ON
OFF OFF
OFF (in cooling)
ON (In heating)
OFF (in cooling)
ON (OFF in low load)
ON (In heating)
Normal heating
Heating
Heating
Subcooled
degree control
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
Functions and Control
SiUS371614E
Normal
Simultaneous
Heating
0 pulse
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse