Midea MC-SU60-RN1L Service Manual

Aqua Tempo Super II
201709 85
Part
4 - Diagnosis and Troubleshooting
Procedure 4.17.4
PE
Taf temperature sensor connection on
main PCB is loose
1
Yes
Ensure the sensor is connected properly
No
Taf temperature sensor has
short-circuited or failed
2
Yes
Replace the sensor
No
Insufficient refrigerant caused by
refrigerant leakage
3
Yes
Add refrigerant or inspect the system for
leaks
No
The low pressure side is blocked, caused
by crushed or bent pipe, blocked 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 air side heat exchanger heat
exchange is poor in heating mode
5
Yes
Inspect the refrigerant system and fix the
error
No
The water flow rate is not sufficient in
cooling mode
6
Yes
Inspect the water system and fix the
error
No
Replace main PCB
Notes:
1. Water side heat exchanger anti-freezing temperature sensor (Taf, include Taf1 and Taf2) connection are ports CN69 and CN31 on the main PCB (labeled 23
and 24 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB” ).
2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance
characteristics table, the sensor has failed. Refer to Part 2, 1 “Layout of Functional Components” and to Table 4-5.3 in Part 4, 5.1 “Temperature Sensor
Resistance Characteristics”.
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.
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.
5. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.
6. Check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages.

Midea MC-SU60-RN1L Specifications

General

Brand	Midea
Model	MC-SU60-RN1L
Category	Chiller
Language	English