Daikin RXYQ96PYDN, Service Manual

Page: 203 / 567

Basic Control SiUS34-801A_b
188 VRVIII R-410A Heat Recovery 60Hz
6. Basic Control
6.1 Normal Operation
6.1.1 List of Functions in Normal Operation
*
1. PI control : Evaporator outlet superheated degree (SH) constant.
* 2. PI control : Condenser outlet subcooled degree (SC) constant.
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
Outdoor unit fan 1
⎯
M1F M1F
Cooling fan control
Outdoor unit heat
exchanger: Condenser /
Cooling fan control
Outdoor unit heat
exchanger: Evaporator /
Fan step 7 or 8 Outdoor unit heat
exchanger: Condenser /
Cooling fan control
Outdoor unit heat
exchanger: Evaporator /
Fan step 7 or 8
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
(Subcooling)
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