Daikin VRV III REYQ8PY1, Service Manual

Page: 110 / 452

Si37-701 Basic Control
Function 99
2. Basic Control
2.1 Normal Operation
2.1.1 List of Functions in Normal Operation
* 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.
Part Name Symbol
(Electric
Symbol)
Function of Functional Part
REYQ REMQ
Normal Cooling Normal Heating
Normal Simultaneous
Cooling / Heating
Compressor 1

M1C M1C
PI control, High
pressure protection,
Low pressure
protection,
Td protection,
INV protection, PI control, High
pressure protection,
Low pressure
protection,
Td protection,
INV protection, PI control, High
pressure protection,
Low pressure
protection,
Td protection,
INV protection,
Compressor 2 M2C M2C
Compressor 3

M3C
Outdoor unit fan 1

M1F M1F
Cooling fan control
Outdoor unit heat
exchanger:
Condenser / Cooling
fan control
Outdoor unit heat
exchanger:
Evaporator / Fan step Outdoor unit heat
exchanger:
Condenser / Cooling
fan control
Outdoor unit heat
exchanger:
Evaporator / Fan step
Outdoor unit fan 2 M2F M2F
Electronic expansion valve
(Main)
EVM
Y1E
Y1E 1375 pls
Outdoor unit heat
exchanger:
Condenser / Liquid
pressure control
Outdoor unit heat
exchanger:
Evaporator / PI control Outdoor unit heat
exchanger:
Condenser / Liquid
pressure control
Outdoor unit heat
exchanger:
Evaporator / PI control
Y3E
Electronic expansion valve
(Supercooling)
EVT
Y2E
Y3E PI control PI control PI control
Y5E
Electronic expansion valve
(Refrigerant charge)
EVJ Y4E Y2E 80 pls 80 pls 80 pls
Four way valve
(Heat exchanger switch)
20SA
Y2S
Y3S OFF
Outdoor unit heat
exchanger:
Condenser / OFF
Outdoor unit heat
exchanger:
Evaporator / ON Outdoor unit heat
exchanger:
Condenser / OFF
Outdoor unit heat
exchanger:
Evaporator / ON
Y9S
Four way valve (High/low
pressure gas pipe switch)
20SB Y8S Y2S ON OFF OFF
Solenoid valve (Main bypass) SVE
Y5S
Y6S ON OFF OFF
Y10S
Solenoid valve (Hot gas) SVP Y4S Y5S OFF OFF OFF
Solenoid valve (Refrigerant
regulator liquid pipe)
SVL Y3S Y4S
ON for refrigerant
recovery ON for refrigerant
recovery ON for refrigerant
recovery
Solenoid valve (Refrigerant
regulator gas vent pipe)
SVG Y1S Y1S
ON for refrigerant
recovery ON for refrigerant
recovery ON for refrigerant
recovery
Solenoid valve (Refrigerant
regulator exhaust pipe)
SVO Y7S Y7S
ON for refrigerant
discharge ON for refrigerant
discharge ON for refrigerant
discharge
Solenoid valve (Refrigerant
regulator discharge pipe)
SVT Y6S Y8S ON for oil level control ON for oil level control ON for oil level control
Indoor unit actuator Normal cooling Normal heating
Fan
Thermostat ON unit Remote controller setting Remote controller setting
Stopping unit OFF OFF
Thermostat OFF unit Remote controller setting LL
Electronic
expansion
valve
Thermostat ON unit Normal opening
*
1 Normal opening
*
2
Stopping unit 0 pls 192 pls
Thermostat OFF unit 0 pls 192 pls
BS unit actuator
Electric
symbol
Normal cooling
Normal heating / Normal simultaneous Cooling /
Heating operation
Electronic expansion valve (EVH) Y4E 760 pls (fully opened) 760 pls ( fully opened )
Electronic expansion valve (EVL) Y5E 760 pls (fully opened) 0 pls
Electronic expansion valve (EVHS) Y2E 480 pls (fully opened) 480 pls ( fully opened )
Electronic expansion valve (EVLS) Y3E 480 pls (fully opened) 0 pls
Electronic expansion valve (EVSC) Y1E 0 pls 0 pls (simultaneous Cooling / Heating operation : PI control)