Huawei NetCol5000-A050 Quick Manual page 3

2.1 Refrigerant R410A
Do not use inferior refrigerant. Otherwise, Huawei has no responsibility for the damage caused by
the inferior refrigerant.
Refrigerant Authenticity Verification Method:
1. Dial the hotline of the refrigerant producer to confirm its reliability.
2. Put the refrigerant indoor for 24 hours. Then use a thermometer to measure the external
surface temperature of the refrigerant cylinder (figure 1) , and connect a pressure gauge to the
cylinder to measure its internal pressure (figure 2) . Look up the following table for the
saturation pressure that corresponds to the external surface temperature, and calculate the
deviation from the internal pressure. If the deviation is more than 0.2 MPa, the refrigerant is
not in good condition. Replace it.
Mapping Between Saturation Temperatures and Pressure of R410A
Saturation
temperature (º C)
10
11
12
13
14
15
16
17
18
3
Checking the Air Pressure
Low-
pressure
needle
valve
Gauge Saturation
(MPa) temperature (º C)
0.99 19
1.02 20
1.05 21
1.09 22
1.12 23
1.16 24
1.19 25
1.23
26
1.27 27
Gauge Saturation
(MPa) temperature (º C)
1.31 28
1.35 29
1.39 30
1.43 31
1.47 32
1.51 33
1.56 34
1.60
35
1.65
36
Discharge
pipe
needle
valve
Liquid
pipe
needle
valve
3
Gauge (MPa)
1.69
1.74
1.79
1.84
1.89
1.94
1.99
2.05
2.10