Piping And Connections; General Recommendations; Grommet Installation - Trane BCHE Installation, Operation And Maintenance Manual

Piping and Connections

NOTICE
Connection Leaks!
Failure to follow instructions below could result in
damage to the coil header and cause connection
leaks.
Use a backup wrench when attaching piping to coils
with copper headers. Do not use brass connectors
because they distort easily.
NOTICE
Over Tightening!
Failure to follow instructions below could result in
damage to the coil header.
Do not use teflon-based products for any field
connections because their high lubricity could allow
connections to be over tightened.
NOTICE
Leakage!
Failure to follow instructions below could result in
equipment damage.
Properly seal all penetrations in unit casing from
inner to outer panel in order to prevent unconditioned
air from entering the module, as well as prevent water
from infiltrating the insulation.

General Recommendations

Proper installation, piping, and trapping is necessary to
ensure satisfactory coil operation and to prevent
operational damage:
• Support all piping independently of the coils.
• Provide swing joints or flexible fittings on all
connections that are adjacent to heating coils to absorb
thermal expansion and contraction strains.
• If the coil was ordered with factory-mounted controls,
install the control valves. The valves ship separately.
Note: The contractor is responsible for supplying the
installation hardware.
• For best results, use a short pipe nipple on the coil
headers prior to making any welded flange or welded
elbow type connections.
• Pipe coils counterflow to airflow.
• When attaching the piping to the coil header, make the
connection only tight enough to prevent leaks.
Note: Do not exceed 200 foot-pounds of torque on
supply and return connections. Do not exceed
25 foot-pounds of torque on drain and vent
connections.
• Use pipe sealer on all thread connections.
BCX-SVX002A-EN
• After completing the piping connections, seal around
pipe from inner panel to outer panel.

Grommet Installation

Grommets for piping headers ship loose in an accessory
bag.
Figure 44. Grommets in accessory bag
Clean oil from panel before installing grommet onto
headers to ensure good grommet adhesion.
Figure 45. Clean panel before installing grommets
To avoid heat damage:
1. Place grommet on the unit stub-outs without removing
the adhesive backing.
2. Connect the incoming and outgoing pipe connections
and before brazing, slide the grommets over the un-
brazed joint away from the unit to avoid heat damage.
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