Basic Control; Normal Operation - Daikin Aurora 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)
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)
47
Electric Symbol
PI control,
High pressure protection,
M1C Low pressure protection,
Td protection,
Inverter protection
M1F, M2F Cooling fan control
Y1E Subcooled degree control
Subcooled degree control (0 pulse
Y3E
in low load)
Superheated degree control
Y2E
(discharge pipe protection)
Y4E Compressor injection control
Y5E Cooling refrigerant control
Y7E 0 pulse
Y1S ON
Y2S OFF
Y3S ON
Y4S ON
Y5S OFF (ON in low load)
Y6S OFF
Y7S ON
Function of Functional Part
Normal Cooling
SiUS341802E
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
Superheated degree control
(Subcooled degree control in low
load)
Superheated degree control (0
pulse in low load)
Superheated degree control
(discharge pipe protection)
Compressor injection control
Cooling refrigerant control
Gas purge control
ON
OFF
ON
OFF
ON
ON
ON
Functions and Control