Daikin ERQ Series, Service Manual

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Function general ESiEN09-06 A
22 Function
1. Function general
1.1 Symbol
Symbol Electric symbol Description or function
20S1 Y3S 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, R33T) 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
SVO Y2S Solenoid valve for oil return
SVP Y1S Solenoid valve for hot gas bypass
SVT Y4S Solenoid valve for injection
Ta R1T (A1P) Outdoor air temperature
Tb R4T Heat exchanger outlet temperature at cooling
Ts2 R2T Suction pipe temperature detected with the suction pipe thermistor (R2T)
Tsh R5T (–) Temperature detected with the subcooling 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 liquid pipe thermistor (R6T)
Tp – Calculated value of compressor port temperature
Ts1 R7T Suction pipe temperature detected with the accumulator inlet thermistor