Midea V4+R Series User Manual

V4+R VRF 50/60Hz
72 201608
Midea V4+R Series Service Manual
Procedure 4.12.4
H8
ODU stop valves are closed
Yes
Open the stop valves
No
High pressure sensor connection on main
PCB is loose
1
Yes
Ensure the sensor is connected properly
No
High pressure sensor has short-circuited
or failed
2
Yes
Replace the sensor
No
Insufficient refrigerant caused by
refrigerant leakage
3
Yes
Add refrigerant and inspect system for
leaks
No
The low pressure side is blocked, caused
by crushed or bent pipe, closed EXV or
dirty filter
4
Yes
Inspect the system and fix the error. If the
filter is blocked by ice, the piping should
be cleaned
No
The evaporator heat exchange is poor
5
Yes
Inspect the system and fix the error
No
Replace the outdoor main PCB
Notes:
1. High pressure sensor connection is port CN17 on the main PCB (labeled 30 in Figure 5-2.1 in Part 5, 2.1 “Ports”).
2. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor
has failed. Refer to Part 2, 1 “Layout of Functional Components”.
3. To check for insufficient refrigerant:
 An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than
normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once
sufficient refrigerant has been charged into the system. For normal system parameters refer to Tables 5-5.4 and 5-5.5 in Part 5, 5.2 “5.2 Normal
Operating Parameters of Refrigerant System”.
4. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and
compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. For normal system parameters refer to Tables 5-5.4 and
5-5.5 in Part 5, 5.2 “5.2 Normal Operating Parameters of Refrigerant System”.
5. In cooling mode check indoor heat exchangers, fans and air outlets for dirt/blockages. In heating mode check outdoor heat exchangers, fans and air outlets
for dirt/blockages.

Midea V4+R Series Specifications

General

Brand	Midea
Model	V4+R Series
Category	Air Conditioner
Language	English