Daikin VRV II RXYQ8MY1K, Service Manual

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Function General Si39-502A
52 Function
1. Function General
1.1 Symbol
Symbol Electric symbol Description or function
20S1 Y1R Four way valve (Energize during heating)
DSH – Discharge pipe superheated degree
DSHi – Discharge pipe superheat of inverter compressor
DSHs – Discharge pipe superheat of standard compressor
EV – Opening of electronic expansion valve
EV1 Y1E Electronic expansion valve for main heat exchanger
EV2 Y2E Electronic expansion valve for sub-coolig heat exchanger
HTDi –
Value of INV compressor discharge pipe temperature (R31T) compensated with
outdoor air temperature
HTDs –
Value of STD compressor discharge pipe temperature (R32T) compensated with
outdoor air temperature
Pc S1NPH Value detected by high pressure sensor
Pe S1NPL Value detected by low pressure sensor
SH – Evaporator outlet superheat
SHS – Target evaporator outlet superheat
SVG Y2S Solenoid valve for discharging gas from receiver
SVP Y1S Solenoid valve for hot gas bypass
SVSL Y3S Solenoid valve for non-operating unit liquid pipe closing
Ta R1T (A1P) Outdoor air temperature
Tb R4T Heat exchanger outlet temperature at cooling
Ts R2T Suction pipe temperature detected with the suction pipe thermistor (R2T)
Tsh R5T Temperature detected with the subcool heat exchanger outlet thermistor (R5T)
Tc – High pressure equivalent saturation temperature
TcS – Target temperature of Tc
Te – Low pressure equivalent saturation temperature
TeS – Target temperature of Te
Tfin R1T Inverter fin temperature
Tl R6T Liquid pipe temperature detected with the receiver outlet liquid pipe thermistor (R6T)
Tp – Calculated value of compressor port temperature