4.2.4.11 Vacuumization
Prerequisites
● All pipe connectors are correct, and the refrigerant pipe tilts and has supports.
● All pipes have been checked for leakage, and all pipes are not bent by a large
angle.
● The hose clamps and cable ties of the drainpipe are secured. Water pipe joints
have been sealed by sealant.
● The refrigerant pipe and water pipe are wrapped with thermal insulation
foam.
● All nitrogen has been exhausted from the indoor unit.
● The stop valves for the gas pipe and liquid pipe of the indoor unit are open.
● The stop valves for the gas pipe and liquid pipe of the outdoor unit are closed.
● Vacuumization is required for the indoor unit, outdoor unit, and low-
temperature component.
● During vacuumization, open the stop valve of the indoor unit, and exhaust
air from the gas pipe needle valve and liquid pipe needle valve of the
indoor unit. Do not exhaust air from only one end. (If a unit is
congured
with a low ambient kit, exhaust air from the liquid outlet pipe of the liquid
storage tank of the low ambient kit.)
Figure 4-39 Indoor unit needle valves
Context
Tools: pressure gauge (measuring range ≥ 4.0 MPa), rubber hose (withstand
pressure ≥ 4.5 MPa), vacuum pump
FusionModule500 Smart Mini Data Center
User Manual 4 Installation Guide
Issue 02 (2020-12-25) Copyright © Huawei Technologies Co., Ltd. 97
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