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Installation
Unit Installation and Maintenance
1. Pre-Installation
The unit needs to be handled with care during transportation and it is prohibited to move the unit
by holding on to the blower or blower blade.
The unit is designed to take its own weight. As such, do not transfer the load of duct, water
pipes and other accessories to the unit. This may cause the hanger to deform and fail.
Before any installation work starts, the following should be checked:
a) Chilled water pipes and condensate water drainage pipes must be properly connected and
standby for use.
b) Electrical wiring is properly connected and all terminals are tightened to prevent loose wires.
c) Sufficient space must be reserved for installation, service and maintenance purposes.
d) Ensure the hanging rod is capable of supporting the weight of the unit and the position of
rods are according to drawing.
e) Ensure the supply and return duct installed (for units that required ducting) is according to
the specification of the unit.
2. Unit Installation
a) Water system
i) The top connecting pipe is for water outlet and bottom connecting pipe is for water
inlet. During installation, do not tighten the pipe with excessive torque to prevent
deformation of heat exchanger. Both inlet and outlet pipes should be insulated,
connecting threads should be sealed using PTFE tape and sufficient gradient should be
maintained for condensate water pipe for proper water drainage.
ii) It is recommended to use union for connection of unit to the supply and return water
pipes and to have isolation valves for each unit to ease servicing work / upgrade of
equipment in the future.
iii)
Water piping should be sufficiently supported at proper intervals to cater for the weight
of the pipes and also water flowing inside. Consideration for expansion and contraction
is a must to prevent leaking and breakage of pipes.
iv)
A manual air vent is located at the water outlet pipe. During commissioning or changing
from cooling to heating cycle (or vice versa), the valve must be opened to release air
that might be trapped inside the pipe in order to ensure good heat exchange efficiency.
b) Direction of pipes connection
Direction of pipes is determined by facing the supply air side of the unit. If the pipes are located
at the left, they are left piping and vice versa. It is important to specify the piping direction
during ordering to avoid installation problem at site.
Caution: Installation and maintenance should be done by qualified technicians who are familiar
with local codes and regulations.
Caution: Sharp edges from the unit and heat exchanger are potential hazard. Handle with
extreme care.
