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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: U0" Low Pressure Drop Due To Refrigerant Shortage Or; Electronic Expansion Valve Failure

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SiUS34-907
U0
3.36 "
" Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure
U0
Remote
Controller
Display
Applicable
RXYMQ36 · 48PVJU
Models
Malfunction
[In cooling mode]
Low pressure becomes 14.5psi or below.
Decision
[In heating mode]
Conditions
The degree of superheat of suction gas becomes 36 degrees and over.
SH= Ts1 –Te
Ts1: Suction pipe temperature detected by thermistor
Te : Saturated temperature corresponding to low pressure
Malfunction is not determined. The unit continues operation.
 Gas shortage or refrigerant clogging (piping error)
Supposed
 Defective thermistor (R4T, R7T)
Causes
 Defective low pressure sensor
 Defective outdoor unit PCB (A1P)
Troubleshooting
Troubleshooting by Indication on the Remote Controller
173

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Table Of Contents

Troubleshooting

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    RXYQ18PAY6 service manual & vrv Fulform