Vacuumization - Huawei NetCol8000-A Series User Manual

NetCol8000-A(050, 100) In-room Air Cooled Smart
Cooling Product
User Manual
Total One-way
Length
L ≤ 10 m
10 m < L ≤ 30 m
30 m < L ≤ 60 m

4.2.2 Vacuumization

Prerequisites
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Context
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Issue 10 (2019-01-15)
Item NetCol500-072
Standard refrigerant 11
charge (kg)
Refrigerant oil 0
charge (kg)
Refrigerant charge = 11 + 0.14 x (L -
= Standard 10)
refrigerant charge +
Additional
refrigerant charge
(kg)
Refrigerant oil = (Refrigerant
charge (kg) charge - 11) x 2.5%
Refrigerant charge = 11 + 0.2 x (L -
= Standard 10)
refrigerant charge +
Additional
refrigerant charge
(kg)
Refrigerant oil = (Refrigerant
charge (kg) charge - 11) x 2.5%
The calculation is used to single system.
Before vacuumization, ensure that all connectors are tightened and the ball valve of the
cooling system is open.
Check whether long pipes are used in the cooling system. If long pipes are used, the
charged amount of refrigerant is calculated and the required amount of the refrigerant oil
is charged into the cooling system.
You can charge the refrigerant oil during the vacuumization. The refrigerant oil is
absorbed into the system by the negative pressure generated during the vacuumization.
The oil injection port must be far away from the vacuumization port so that the charged
refrigerant oil will not be pumped out by the vacuum pump. The advised port is 1 as
shown in Figure 3-36.
When vacuumization is interrupted, please close the pressure gauge. Vacuumizing the
cooling system for 20s and then open the pressure gauge when go on to vacuumization.
Copyright © Huawei Technologies Co., Ltd.
4 Power-On Commissioning
NetCol500-072 NetCol500-088
(including
low-temperature
component)
25 18
0.35 0
= 25 + 0.14 x (L - = 18 + 0.14 x (L -
10) 10)
= (Refrigerant = (Refrigerant
charge - 11) x 2.5% charge - 18) x 2.5%
= 25 + 0.2 x (L - = 18 + 0.2 x (L -
10) 10)
= (Refrigerant = (Refrigerant
charge - 11) x 2.5% charge - 18) x 2.5%
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