42 CLCH-SVX013B-EN
Piping and Connections
NOTICE
Connection Leaks!
Use a backup wrench when attaching piping to coils
with copper headers to prevent damage to the coil
header. Do not use brass connectors because they
distort easily and could cause connection leaks.
NOTICE
Over Tightening!
Do not use Teflon-based products for any field
connections because their high lubricity could allow
connections to be over-tightened, resulting in damage
to the coil header.
NOTICE
Leakage!
Properly seal all penetrations in unit casing. Failure to
seal penetrations from inner panel to outer panel could
result in unconditioned air entering the module, and
water infiltrating the insulation, resulting in equipment
damage.
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
co
nnections 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: T
he contractor is responsible for supplying the
installa
tion hardware.
• For best results, use a short pipe nipple on the coil
headers pri
or to making any welded flange or welded
elbow type connections.
• Extended drain and vent connections are provided as
stand
ard on
D1 and D2 coils only. If extended drains
and vents are required on other water coils, they must
be field-installed or ordered as specials from the
factory.
• Pipe coils counterflow to airflow.
• When attaching the piping to th
e coil he
ader, make the
connection only tight enough to prevent leaks.
Note: Do not exceed 200 foot-pou
nds of torque on supply
and return connections. Do not exceed 25 foot-
pounds of torque on drain and vent connections.
• Use pipe sealer on al
l thr
ead connections.
• After completing the piping connections, seal around
pipe from in
ner panel to outer panel.
Drain Pan Trapping
WARNING
No Step Surface!
Do not walk on the sheet metal drain pan. Walking on
the drain pan could cause the supporting metal to
collapse, resulting in the operator/technician to fall.
Failure to follow this recommendation could result in
death or serious injury.
NOTICE
Water Damage!
When more than one section has a drain pain, trap
each section individually. Connecting all drains to a
common line with only one trap can result in
condensate retention and possible water damage to
the air handler or adjoining space.
Threaded condensate drain connections are provided on
on
ly one si
de of the coil section. Pitch the connection lines
horizontal or downward toward an open drain. Trane
recommends installing a plug to facilitate cleaning of the
trap. The drain connection sizes are:
Figure 9 illustrates the proper trapping, piping, and
ope
ration of the trap. Use the
formula under the figure to
determine the correct minimum depth for the condensate
trap. If a section has a drain pan for cleaning purposes
only, it does not need a trap; however, a cap or shutoff
valve should be installed on the drain connection. Only
sections handling condensate, such as a cooling coil
section or moisture eliminator section, require a trap.
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