After Brazing; Chilled Water & Heating Coils - Daikin AVS Installation Manual

Water Coil Connections
Hook up water piping in accordance with Figure 38 and 39 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 38 - Hot Water Coil Connections
Hot Water Coil
Hot Water Supply
Hot Water Return
Figure 39- Chilled Water Coil Connections
Chilled Water Coil
Chilled Water Return
Chilled Water Supply
Figure 40 - Protect Components From Overheating Before Brazing
Use A Quenching Cloth
When Brazing, to Prevent
Overheating The Piping
Components (Avoid Valve
D a m a g e a n d E r r a t i c
Operation)
IM 817-4
2-pipe Chilled Water/Hot Water Systems
After making the piping connections, securely attach and insulate the
water-in temperature sensor (S5) 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.
For Water Systems
After flushing piping adequately, so all debris is removed, fill the system.
Consider adding
piping unions
for future servicing
At initial operation, vent manually by unscrewing the vent plug one or
(by others)
two turns, figure 41. After venting, tighten the vent plug firmly.
Figure 41 - Vent and Drain Plug
Unscrew the vent plug one
or two turns to manually vent
system.
Consider adding
piping unions
for future servicing
(by others)
CAUTION
Donut insulation seals must be installed for proper air flow
through the coil.
WARNING
Water system under pressure. Keep face and body parts well
away from vent.
Unscrew the vent plug only one or two complete turns, and vent
slowly. Water pressure can result in severe personal injury.
Vent
Drain Plug
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