Hydraulic System Installation - Daikin UHA075B5 Catalogue/Engineering Data

Hydraulic System Installation

Note: Units must be installed by DAIKIN service staff or by specially trained personnel. The installation of
units must meet requirements of national and local laws, regulation and standards on electrical, building and
environmental protection as well as the installation manual.
Precautions
■ Water system pipeline should not be installed until machine fastening.
■ Water pipes must be insulated after installation to reduce heat loss.
■ Reverse return system must be adopted when more than 3 units are comnbined to ensure better hydraulic
balance.
■ Connect water pipe to water inlet and water outlet of the unit.
■ Fastening metal plates have been installed at joints for inlet and outlet pipes of the unit. For water pipe
connection, fasten the joint by pipe wrench and rotate the water pipe. Avoid direct bearing of rotating
torsion by reserved joint of the unit (see the figure).
■ The flow rate of circulating water should not be lower than the nominal value of the unit.
■ Configure circulating water pump with appropriate flow rate and
pressure head at the circulating water side.
■ Water supply safety valve must be installed.
■ Install check valve at the inlet pipe joint.
■ Install a proper drainage valve at the lowest point of the water
system.
■ The users must configure an appropriate water flow switch at the
place before circulating water entering the unit.
■ Please refer to the "Hydraulic system installation schematic diagram" for water system installation; specific
installation work should be carried out according to design drawings.
■ Install the Y-shaped water filter in the water inlet pipe (more than 18 meshes recommended) and rinse the
filter screen after commissioning.
■ Before injecting water, make sure that no sand, rubble, rust, soldering tin residue or other impurities exist
in the pipe, as these things might damage the heat exchanger. While rinsing the water system, please
bypass the unit and the terminal heat exchanger using by-pass valves.
■ The water system should be inspected by the customer once every half a month
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