Huawei NetCol8000-E220 Series Quick Manual page 3

Requirements for Maintenance Space
2.3
Unit: mm
2.4 Refrigerant R410A
Do not use inferior refrigerant. Otherwise, Huawei has no responsibility for the damage caused by
the inferior refrigerant.
Follow these suggestions to choose a high-quality refrigerant:
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 Gauge
Temperature ( °C )
(MPa)
10
11
12
13
14
15
16
17
18
Wall
Saturation
Temperature ( °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
Electric control box
Gauge Saturation
Temperature ( °C )
(MPa)
1.31
1.35
1.39
1.43
1.47
1.51
1.56
1.60
1.65
3
Gauge
(MPa)
28 1.69
29 1.74
30 1.79
31 1.84
32 1.89
33 1.94
34 1.99
35 2.04
36 2.10