Basic Control; Normal Control - Daikin VRV RXYQ72-384XAYCA Service Manual

Basic Control

5. Basic Control
5.1

Normal Control

Part name
Compressor
Fan motor
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)
87
Electric symbol
PI control, High pressure protection,
M1C Low pressure protection,
Td protection, Inverter protection
M1F, M2F Cooling fan control
Subcooling degree control
Y1E
Subcooling degree control
Y3E
(0 pulse in low load)
Superheating degree control
Y2E
(discharge pipe protection)
Compressor injection control
Y4E
Cooling refrigerant control
Y5E
0 pulse
Y7E
ON
Y1S
OFF
Y2S
Y3S ON
ON
Y4S
OFF (ON in low load)
Y5S
OFF
Y6S
ON
Y7S
Function
Normal cooling
SiUS342004EB
Normal heating
PI control, High pressure protection,
Low pressure protection,
Td protection, Inverter protection
Maximum step
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
ON
Part 4 Functions and Control