Basic Control; Normal Control - Daikin VRV EMERION REYQ-AATJA Service Manual

Basic Control

5. Basic Control
5.1

Normal Control

Part name
Compressor motor
Fan motor
Electronic expansion valve
(Heat exchanger right upper)
Electronic expansion valve
(Heat exchanger right lower)
Electronic expansion valve
(Heat exchanger left)
Electronic expansion valve
(Subcooling heat exchanger)
Electronic expansion valve
(Refrigerant cooling IPM)
Electronic expansion valve
(Refrigerant cooling air)
Electronic expansion valve
(Receiver gas purge)
Solenoid valve
(Oil separator oil return)
Solenoid valve (Liquid shutoff)
Solenoid valve
(Accumulator oil return)
Solenoid valve
(Refrigerant adjustment)
Solenoid valve (Injection)
Four way valve
(Heat exchanger right lower)
Four way valve
(HP/LP gas pipe)
Four way valve
(Heat exchanger left)
Four way valve
(Heat exchanger right upper)
Solenoid valve
(Refrigerant cooling bypass)
149
Electric symbol
Normal cooling
PI control, High pressure
protection, Low pressure
M1C, M2C protection,
Td protection, Inverter
protection
Cooling fan control
M1F, M2F
Subcooling degree control Superheating degree
Y1E
Subcooling degree control
Y2E
(0 pulse in low load)
Y5E
Superheating degree
Y3E control (discharge pipe
protection)
Cooling refrigerant control Cooling refrigerant control Cooling refrigerant control
Y6E
Y7E
0 pulse
Y4E
ON
Y1S, Y2S
Y3S ON
ON
Y4S
OFF
Y5S
Compressor injection
Y6S
control
OFF (ON in low load)
Y7S
ON
Y8S
OFF (ON in low load)
Y9S
OFF
Y10S
Cooling refrigerant control OFF
Y11S
Function
Normal heating
PI control, High pressure
protection, Low pressure
protection,
Td protection, Inverter
protection
Maximum step
control (Subcooling
degree control in low load)
Superheating degree
control (0 pulse in low
load)
Superheating degree
control (discharge pipe
protection)
Gas purge control
ON
ON
ON
OFF
Compressor injection
control
ON
OFF
ON
ON (OFF in low load)
Part 4 Functions and Control
SiUS372201EB
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 /
Maximum step
Subcooling degree control
(when HE is condenser)
Superheating degree
control (when HE is
evaporator)
Superheating degree
control (discharge pipe
protection)
Gas purge control
ON
ON
ON
OFF
Compressor injection
control
OFF (In cooling)
ON (In heating)
OFF
OFF (In cooling)
ON (In heating)
OFF (In cooling)
ON (In heating)
OFF