Basic Control; Normal Operation - Daikin VRV III REYQ8PY1 Service Manual

Si37-701
2.

Basic Control

2.1

Normal Operation

2.1.1 List of Functions in Normal Operation
Part Name
Compressor 1
Compressor 2
Compressor 3
Outdoor unit fan 1
Outdoor unit fan 2
Electronic expansion valve
(Main)
Electronic expansion valve
(Supercooling)
Electronic expansion valve
(Refrigerant charge)
Four way valve
(Heat exchanger switch)
Four way valve (High/low
pressure gas pipe switch)
Solenoid valve (Main bypass) SVE
Solenoid valve (Hot gas)
Solenoid valve (Refrigerant
regulator liquid pipe)
Solenoid valve (Refrigerant
regulator gas vent pipe)
Solenoid valve (Refrigerant
regulator exhaust pipe)
Solenoid valve (Refrigerant
regulator discharge pipe)
Indoor unit actuator
Fan
Electronic
expansion
valve
*1. PI control : Evaporator outlet superheated degree (SH) constant.
*2. PI control : Condenser outlet subcooled degree (SC) constant.
*1 and 2 : Refer to "6.4 Control of Electronic Expansion Valve" on page 141.
BS unit actuator
Electronic expansion valve (EVH)
Electronic expansion valve (EVL)
Electronic expansion valve (EVHS)
Electronic expansion valve (EVLS)
Electronic expansion valve (EVSC)
Function
(Electric
Symbol)
Symbol
REYQ REMQ
M1C M1C PI control, High
pressure protection,
Low pressure

M2C M2C
protection,
Td protection,

M3C
INV protection,
M1F M1F

Cooling fan control
M2F M2F
Y1E
EVM Y1E 1375 pls
Y3E
Y2E
EVT Y3E PI control
Y5E
EVJ Y4E Y2E 80 pls
Y2S
20SA Y3S OFF
Y9S
20SB Y8S Y2S ON
Y5S
Y6S ON
Y10S
SVP Y4S Y5S OFF
ON for refrigerant
SVL Y3S Y4S
recovery
ON for refrigerant
SVG Y1S Y1S
recovery
ON for refrigerant
SVO Y7S Y7S
discharge
SVT Y6S Y8S ON for oil level control ON for oil level control ON for oil level control
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Electric
Normal cooling
symbol
Y4E 760 pls (fully opened)
Y5E 760 pls (fully opened)
Y2E 480 pls (fully opened)
Y3E 480 pls (fully opened)
Y1E 0 pls
Function of Functional Part
Normal Cooling Normal Heating
PI control, High
pressure protection,
Low pressure
protection,
Td protection,
INV protection,
Outdoor unit heat
exchanger:
Condenser / Cooling
fan control
Outdoor unit heat
exchanger:
Evaporator / Fan step
Outdoor unit heat
exchanger:
Condenser / Liquid
pressure control
Outdoor unit heat
exchanger:
Evaporator / PI control
PI control
80 pls
Outdoor unit heat
exchanger:
Condenser / OFF
Outdoor unit heat
exchanger:
Evaporator / ON
OFF
OFF
OFF
ON for refrigerant
recovery
ON for refrigerant
recovery
ON for refrigerant
discharge
Normal cooling
Remote controller setting
OFF
Remote controller setting
*
Normal opening 1
0 pls
0 pls
Normal heating / Normal simultaneous Cooling /
0 pls (simultaneous Cooling / Heating operation : PI control)

Basic Control

Normal Simultaneous
Cooling / Heating
PI control, High
pressure protection,
Low pressure
protection,
Td protection,
INV protection,
Outdoor unit heat
exchanger:
Condenser / Cooling
fan control
Outdoor unit heat
exchanger:
Evaporator / Fan step
Outdoor unit heat
exchanger:
Condenser / Liquid
pressure control
Outdoor unit heat
exchanger:
Evaporator / PI control
PI control
80 pls
Outdoor unit heat
exchanger:
Condenser / OFF
Outdoor unit heat
exchanger:
Evaporator / ON
OFF
OFF
OFF
ON for refrigerant
recovery
ON for refrigerant
recovery
ON for refrigerant
discharge
Normal heating
Remote controller setting
OFF
LL
Normal opening
192 pls
192 pls
Heating operation
760 pls ( fully opened )
0 pls
480 pls ( fully opened )
0 pls
*
2
99