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Ensure proper insulation of supply and return piping.
Proper insulation prevents loss of unit ventilator capacity,
overheating of end compartment, and / or moisture
dripping.
The piping to and from the unit must be protected from
outside air and freeze conditions. The piping must be
suitably insulated for condensation or heat lose or gain.
Penetrations entering the unit end compartments must
be fitted/sealed for unit integrity.
Water Coil Connections
Hook up water piping in accordance with
and
Figure 38
for hot water and chilled water coil
connections.
CAUTION
Failure to install water piping to coils properly can result in
improper unit operation and coil freeze-ups.
NOTICE
Use piping shut off valves and connection unions for future
servicing to the coil supply and return stubs, instead of hard
piping. This permits easy removal of the coil or control valve if
servicing is required.
Figure 37: Hot Water Coil Connections (Right-Hand Shown)
Hot Water Coil
Hot Water Supply
Hot Water Return
Figure 38: Chilled Water Coil Connections (Right-Hand
Shown)
Chilled Water Coil
Chilled Water Return
Chilled Water Supply
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Figure 39: Protect Components From Overheating Before
Brazing
Figure 37
2-pipe Chilled Water/Hot Water Systems
After making the piping connections, securely attach and
insulate the water-in temperature sensor (OCT) to the
water coil supply line. The sensor should be located on
the water supply line in an area where there is continuous
water flow. The sensor hangs loose in the same end
compartment as the coil connections. This sensor must
be attached correctly for proper unit operation.
After Brazing
Install provided donut shaped insulation seals around
pipe fittings, by removing white backing. Press seals up
to coil partition to seal gaps in partition insulation.
Donut insulation seals must be installed for proper air flow through
the coil.
For Water Systems
After flushing piping adequately, so all debris is removed,
fill the system.
Consider adding
Water system under pressure. Keep face and body parts well
piping unions
for future servicing
away from vent. Unscrew the vent plug only one or two complete
(by others)
turns, and vent slowly. Water pressure can result in severe
personal injury.
At initial operation, vent manually by unscrewing the vent
plug one or two turns,
the vent plug firmly.
Figure 40: Vent and Drain Plug
Consider adding
piping unions
for future servicing
(by others)
17
Use A Quenching Cloth When Brazing,
to Prevent Overheating The Piping
Components (Avoid Valve Damage and
Erratic Operation)
CAUTION
WARNING
Figure
Vent
Unscrew the vent plug
one or two turns to
manually vent system.
Drain Plug
40. After venting, tighten
IM 817-7
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