Installing A Supply Air Duct - Huawei NetCol8000-E220 User Manual

NetCol8000-E220 Modular Indirect Evaporative
Cooling System
User Manual
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4.9.1 Installing a Supply Air Duct

Context
The supply air duct is optional. Customers can purchase it from the supplier or
prepare it by themselves. The following describes how to install a supply air duct
provided by the supplier.
Procedure
Step 1 Remove the pedal.
Issue 10 (2024-01-30)
It is recommended that the air ducts be made of galvanized steel sheets or
higher-level materials. The thickness of the steel sheets must be at least 1.2
mm.
Add a pad at the flange joint between air duct sections. The pad should be
closed-cell foam rubber (thickness: 5 mm) or sealing rubber strip.
Flexible connections are required between the air ducts and the unit. The
flexible connections must be properly tightened without obvious distortion.
The cross-sectional area of an air duct must be greater than or equal to the
area of the corresponding air vent on the unit.
When installing an air duct, ensure that the air duct does not interfere with
the maintenance door of the unit. If there are high requirements on noise,
attach noise reduction sponges to the inner surface of the air duct.
For connections between the unit, flexible connections, air ducts, air dampers,
and building, the bolt spacing should not exceed 150 mm and all connection
seams should be sealed with sealant.
The external surfaces of air ducts, flexible connections, and air dampers must
be mounted with thermal insulation foam and an outer protective layer. The
thermal insulation foam must be made of antibacterial and mold-proof
material and at least 30 mm thick. The outer protective layer must be made
of aluminum sheets or stronger material that is at least 0.6 mm thick for
long-term outdoor application.
After air ducts and flexible connections are installed and sealed, perform light
leakage testing and rain testing to prevent air, cooling, and rain leakage
during use.
Recommended method for rain testing: Use a spray device (nozzle diameter:
6.3 mm) 3 m away from the unit and spray water to the air ducts and joints
at the flow rate of 12.5 L/min. Keep spraying to each key point for at least 5
min. After rain testing is complete, check the container, air ducts, and flexible
connections of the unit for water leakage.
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