Hisense AVWW-76FKFW Installation And Maintenance Manual page 10

● Before performing any brazing work, be sure that there are no flammable materials or open flame
nearby.
● Perform a test run to ensure normal operation. Safety guards, shields, barriers, covers, and protective
devices must be in place while the compressor/unit is operating. During the test run, keep fingers and
clothing away from any moving parts.
● Clean up the site when finished, remembering to check that no tools, metal scraps, or bits of wiring
have been left inside the unit being installed.
● During transportation, do not allow the backrest of the forklift make contact with the unit, otherwise, it
may cause damage to the unit and also may cause injury when stopped or started suddenly.
● Remove gas inside the closing pipe (piping cap) when the brazing work is performed. If the brazing filler
metal is melted with remaining gas inside, the pipes will be blown off and it may cause injury.
● Be sure to use nitrogen gas for an airtight test. If other gases such as oxygen gas, acetylene gas or
fluorocarbon gas are accidentally used, it may cause explosion or gas intoxication.
After installation work for the system has been completed, explain the "Safety Precautions," the proper use
and maintenance of the unit to the customer according to the information in all manuals that came with the
system. All manuals and warranty information must be given to the user or left near the Indoor Unit.
Water Piping Precautions
● Select the water piping according to local or national regulation.
Supply water must be clean tap water or industrial water. (Refer to Section 6.4 "Water Quality
Requirements" for details.)
● Do not connect the drain outlet to the water piping.
Install drain piping to proper drainage. Improper drain piping may result in water leakage and property
damage.
● Perform piping work in such a way no water may drop on the service panels of the water source unit.
Securely fasten the service panels. Otherwise, dust or water may enter the unit causing fire or electric
shock.
● Water source unit must be used with closed type cooling tower. Open type cooling tower can not be
used.
Be sure to check the water pipeline construction, water quality monitoring, and water treatment.
● This product is equipped with plate type heat exchangers. In the plate type heat exchanger, water flows
through a narrow space between the plates.
Water strainer must be installed at the water inlet side of water piping near the product.
Otherwise, impurities and water scales will damage heat exchanger. Be sure to regularly clean the
strainer according to the clogging degree.
● Perform thermal insulation up to the water inlet/outlet of heat exchanger and the water piping to prevent
sweating and freezing.
Otherwise, damage may be caused by freezing during low ambient temperature and thermal loss.
Amount of insulation depends on pipe temperature, air temperature, and humidity.
● Be sure to check the position of connection pipe. Do not connect inlet and outlet pipe reversely.
Connection pipe and pipe joint on heat exchanger should be removal to make operation and clean work
more convenient.
● There must be an extra bracer to support piping and piping joints. Use a sleeve to protect the pipes at
the point where they go through a wall.
● Perform a thorough inspection of the unit to check for leaks both inside and outside of the system.
Open fully the water inlet and outlet valves to the unit. Ensure valve flow to the inlet and outlet piping.
Ensure air purge and drain valves are functioning on the water piping.
Remove the valve handle to prevent the valve from being opened. If this valve is opened during
operation, water blow-off can cause disruption.
Set the drain valve at lower points in the water system to allow thorough discharge of water to the heat
exchanger and system.
● When shutting down the unit for a long period, drain the water from the water piping by opening the
drain plug or the air purge plug.
Take the following precautions to reduce the risk of property damage.
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