Duct System; Piping - AAON M3 Series Installation Operation & Maintenance

Note: If one damper bank is to be
independently controlled by two actuators,
the two gears that join the separate portions
will need to be cut so that they do not
engage each other.

Duct System

Remove duct shipping covers immediately
prior to duct connection. A 1 inch tall duct
flange is provided around each duct
opening.

Piping

The coil connections are copper MPT. Use
dielectric unions as necessary to prevent
galvanic-corrosion.
Always use a backup pipe wrench to prevent
excess stress and
connections. The connecting piping should
never be supported by the coil, it should be
independently supported. Swing joints or
flexible fittings should be used to absorb
expansion and contraction
temperature changes.
An access cover is provided for the chilled
water, hot water, and steam coil vent and
drains. Remove the two bolts by each coil
connection. When replacing the cover, take
care not to over-tighten the bolts as this
could cause the rivet-nut to come loose.
Vents and drains are sealed with half inch
plugs.
All coils should be piped in a counter-flow
arrangement. The water entering connection
should be on the air leaving side of the coil.
damage to coil
due to
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