Discharge Pipe Temperature Control - Daikin K-Series Service Manual

SiBE061121.book Page 95 Monday, April 25, 2011 3:21 PM
SiBE061121

4.15 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
Malfunction
Decision
Conditions
<25/35 class>
Stop temperatures
(1) above 45 Hz (rising), above 40 Hz (dropping)
(2) 30 ~ 45 Hz (rising), 25 ~ 40 Hz (dropping)
(3) below 30 Hz (rising), below 25 Hz (dropping)
<50 class>
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.119
Check No.12
Refer to P.121
Check No.14
Refer to P.122
Service Diagnosis
If the temperature detected by the discharge pipe thermistor rises above A °C, the
compressor stops.
The error is cleared when the discharge pipe temperature has dropped below B °C.
A (°C) B (°C)
110 95
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
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Defective outdoor electronic expansion valve or coil
Refrigerant shortage
Defective four way valve
Water mixed in refrigerant
Defective stop valve
Defective outdoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
NG
Check No. 01
Check the thermistors.
•
•
•
OK
Check No. 12
NG
Check the outdoor electronic
expansion valve
coil.
OK
Check No. 14
NG
Check the refrigerant
•
line.
•
•
OK
•
A (°C) B (°C)
110
105
99
Discharge pipe thermistor
Outdoor heat exchanger thermistor
Outdoor temperature thermistor
Refrigerant shortage
Four way valve
Water mixed
Stop valve
Troubleshooting
97
92
86
Replace the defective
thermistor.
Replace the outdoor
electronic expansion valve
or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R14412)
95