Midea MV6-i252WV2GN1-E, Руководство по обслуживанию

Страница: 116 / 130

V6-i VRF 50/60Hz
115
P
art
6
- Di
agno
si
s and
Tr
ou
bles
ho
o
ting
2.19 P4, H6: Discharge temperature protection
Digital display output 2.19.1
;
Description 2.19.2

Discharge temperature protection.

All units stop running.

Error code is only displayed on the unit with the error.
Trigger / recover condition 2.19.3

Trigger condition:
For P4 protection: Discharge temperature (T7C1/2) ≥ 120
o
C.
For H6 protection: P4 protection appears three times in 100 minutes.

Recover condition: Discharge temperature (T7C1/2) ≤ 90
o
C.

Reset method:
For P4 protection: Resume automatically.
For H6 protection: Manually restart.
Possible causes 2.19.4

Outdoor unit stop valves are closed.

Temperature sensor/switch not connected
properly or has malfunctioned.

Insufficient refrigerant.

System blockage.

Indoor load too large.

System contains air or nitrogen.

Poor condenser heat exchange.

Main PCB damaged.
Procedure 2.19.5
P4 / H6
ODU stop valves are closed
Yes
Open the stop valves
No
Compressor top temperature sensor,
discharge pipe temperature sensor
and/or discharge temperature switch
connections on main PCB are loose
1
Yes
Ensure the sensors and switch are
connected properly
No
Compressor top temperature sensor
and/or discharge pipe temperature
sensor have short circuited or failed
2
Yes
Replace the faulty sensor(s)
No
Flowchart continued on next page …
… flowchart continued from previous page