Discharge Pipe Temperature Control - Daikin H Series Service Manual

SiUS04-924_A

4.14 Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Method of
An error is determined with the temperature detected by the discharge pipe thermistor.
Malfunction
Detection
 If the temperature detected by the discharge pipe thermistor rises above 120°C (248°F), the
Malfunction
Decision
 The error is cleared when the discharge pipe temperature has dropped below 107°C (224.6°F).
Conditions
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
 Defective discharge pipe thermistor
Supposed
Causes
 Defective electronic expansion valve or coil
 Refrigerant shortage
 Defective four way valve
 Water mixed in refrigerant
 Defective stop valve
 Defective outdoor unit PCB
Troubleshooting
Check No.01
Refer to P.110
Check No.12
Refer to P.112
Check No.14
Refer to P.113
88
compressor stops.
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check No. 01
Check the thermistors.
OK
Check No. 12
Check the electronic
expansion valve.
OK
Check No. 14
Check the refrigerant
line.
OK
NG
• Discharge pipe thermistor
• Outdoor heat exchanger thermistor
• Outdoor temperature thermistor
NG
NG
• Refrigerant shortage
• Four way valve
• Water mixed
• Stop valve
Troubleshooting
Replace the defective
thermistor.
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R14412)
Service Diagnosis