R410A All DC Inverter V5 X Series 50Hz
MCAC-VTSM-2015-10
166 Troubleshooting
Attached table 3: Commissioning and operating parameters of refrigerant system
Condition 1:
Make sure outdoor unit can detect all indoor units, the quantity of indoor units is displayed steadily and is equal to
actual quantity of installed indoor units.
Condition 2:
Make sure all the valves in outdoor units are open, indoor units EXVs are connected to indoor PCB.
Condition 3:
The ratio of connectable indoor units is 100%. When ambient temperature is high, operate the system in cooling
mode and set the temperature 17
o
C(62.6
o
F). When ambient temperature is low, operate the system in heating mode and set the
temperature 30
o
C(86
o
F). Then check the parameters after system has been running normally more than 30 minutes.
Outdoor unit cooling parameters table
Ambient temperature (T4)
o
C
20-27
27-33
33-38
38-45
Discharge pressure (spot check)
MPa
2.1-2.3
2.8-3.2
3.3-3.5
3.7-3.9
Pressure of high pressure valve
MPa
1.8-2.0
2.4-2.7
2.8-3.1
3.2-3.5
Pressure of low pressure valve
MPa
0.7-0.9
0.8-1.0
1.0-1.2
1.2-1.4
Discharge temperature (spot check)
o
C
50-65
70-85
75-90
80-90
DC inverter compressor current
(BP1/BP2)* (spot check)
A
8-13/5-11
14-17/7-11
15-18/7-12
9-11/5-7
Average
temperature
of
evaporator outlet T2B
o
C
8-9
12-15
16-17
20
Outdoor unit heating parameters table
Ambient temperature (T4)
o
C
-15--5
-5-5
5-12
12-18
Discharge pressure (spot check)
MPa
2.0-2.2
2.2-2.7
3.0-3.1
2.6-2.7
Pressure of high pressure valve
MPa
1.7-1.8
1.8-2.4
2.6-2.8
2.2-2.4
Pressure of low pressure valve
MPa
2.0-2.2
2.2-2.6
3.0-3.1
2.6-2.7
Discharge temperature (spot check)
o
C
50-70
60-70
60-85
60-70
DC inverter compressor current
(BP1/BP2)* (spot check)
A
9-12/5-7
10-12/5-8
6-8/9-10
11-15/6-9
Average
temperature
of
condenser outlet T2
o
C
33
33-40
46-50
39-41
