Discharge Pipe Temperature Control - Daikin 3MKS50E3V1B Service Manual

SiBE121135

7.11 Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Outdoor Unit LED
A
Display
Method of Detected by the discharge pipe thermistor
Malfunction
Detection
Malfunction
Decision
Conditions
40/50/52/58 class
68/75/80/90 class
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.325
Check No.12
Refer to P.329
Check No.14
Refer to P.330
Service Diagnosis
j i h i h
1 2 3 4
If the temperature detected by the discharge pipe thermistor rises above
compressor stops.
The error is cleared when the discharge pipe temperature is dropped below
A (°C)
110
120
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.
Check No. 01
Check the thermistors.
OK
Check No. 12
Check the outdoor electronic
expansion valve.
OK
Check No. 14
Check the refrigerant
line.
OK
h
5
B (°C)
95
107
NG
∗
Discharge pipe thermistor
∗
Outdoor heat exchanger thermistor
∗
Outdoor temperature thermistor
NG
NG
∗
Refrigerant shortage
∗
Four way valve
∗
Water mixed
∗
Stop valve
Troubleshooting for Outdoor Unit
°C, the
A
°C.
B
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.
(R15286)
309