Headers, whether return steam condensate or hot water supply
and return, are securely bolted to lower mounting brackets to
prevent damage to header and tubes during shipment and piping
of the coils. These bolts MUST be removed before applying
steam or hot water but after all piping connections are made.
Steam and hot water eld piping must be supported separately
after the exible connector to isolate piping strains and
additional expansion from the coils.
Internal steam manifolds and piping should be insulated.
Steam traps should be sized for three times the calculated
condensate loading at the coil design conditions. The
calculation should be based on the pressure differential across
the trap, not the boiler pressure. Traps should be of types that
pass condensate and vapor at saturated steam temperature.
Inverted bucket traps should incorporate thermostatic air
vents.
Make return connection full size as required and reduce only
at trap. Do not use reducing bushing on coil return connection.
Return steam condensate headers, hot water supply, and
return headers must be free to oat. A exible connector
MUST be installed as close as possible to the coil to
accommodate a minimum of 1/2” expansion movement of
the headers.
Failure to install connectors will restrict expansion of the headers.
This can result in bowing of tubes, bending of ns, interference
with damper operation, or eventually tube breakage.
The outside air and return air must be thoroughly mixed before
passing over the coil. When air below 32°F enters only part
of the coil, it creates a greater hazard than when the airow
entering the coil is of a uniform temperature.
Coils used in series with respect to the airow must have
individual controls with ample space between the coils for
sensing devices, when required. Coils with two or more rows
are more sensitive to freezing than single row coils.
On 100% O.A. capable applications, locate low limit at least 24"
downstream of leaving edge of VIFB/IFB casing. Low limit element
must cross both face and bypass areas, parallel to headers.
• Drill motor.
• Pilot starter bit.
• Hole saws-approximately 2½”, 3¼” & 4½” diameter for
holes.
• Power cords as required.
• Neoprene grommet, 2½”, 3¼”, 4½” or 5½" as required.
• Cold galvanized paint.
• Touchup spray paint, champagne, P/N 044-03504-000 (for
outdoor unit exterior only).
• Caulk, P/N 013-03317-050 aluminum gray or 013-03317-
040 for outdoor units with champagne paint.
• X-acto
®
knife.
• Clean up supplies.
1. Make sure any components; bulkheads or other
obstructions are disconnected from panel inside and out.
2. Layout location and dimensions of hole opening to be cut.
Do this on both sides of double wall panels.
3. Carefully cut correct hole size for the application in panel,
ensuring cuts on both sides line up and a smooth clean cut is
made.
4. Paint raw edges of sheet metal with cold galvanized paint.
5. Select appropriate grommet for new panel hole and cut
out appropriate hole diameter for penetration with an X-acto
knife.
6. After paint dries, Install grommet into panel hole opening.
7. Apply sealant all around new hole opening behind lip of
grommet, on both sides of panel.
8. Run pipe or conduit through grommet and make
appropriate connections.
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