![Daikin REYQ8-48PY1B Service Manual Download Page 350](http://html.mh-extra.com/html/daikin/reyq8-48py1b/reyq8-48py1b_service-manual_502202350.webp)
Troubleshooting by Indication on the Remote Controller
SiBE37-701_B
339
Troubleshooting
3.47
“
U0
”
Outdoor Unit: Refrigerant Shortage Alert
Remote
Controller
Display
U0
Applicable
Models
REYQ8P~48P
Method of
Malfunction
Detection
Detect refrigerant shortage based on the temperature difference between low pressure or
suction pipe
and heat exchanger.
Malfunction
Decision
Conditions
[In cooling mode]
Low pressure becomes 0.1MPa or below.
[In heating mode]
The degree of superheat of suction gas becomes 20 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 the operation.
Supposed
Causes
Refrigerant shortage or refrigerant clogging (piping error)
Defective thermistor (R4T, R7T, R12T, R15T)
Defective low pressure sensor
Defective outdoor unit PCB (A1P)
Summary of Contents for REYQ8-48PY1B
Page 1: ...Service Manual REYQ8 48PY1B R 410A Heat Recovery 50Hz SiBE37 701_B ...
Page 456: ...Piping Installation Point SiBE37 701_B 445 Appendix ...
Page 460: ...Example of connection SiBE37 701_B 449 Appendix ...
Page 476: ...Revision History Date News No Contents 2010 9 10 M 10011 Correction of service manual ...