Piping And Connections; Piping For Staggered Coils; General Recommendations; Drain Pan Trapping - Trane CSAA Installation, Operation And Maintenance Manual

Piping and Connections

NOTICE
Connection Leaks!
Do not use brass connectors because they distort easily
and could cause connection leaks. Use a backup
wrench when attaching piping to coils with copper
headers to prevent damage to the coil header.
NOTICE
Over Tightening!
Failure to follow instructions could cause damage to
coil header. Do not use Teflon-based products for any
field connections because their high lubricity could
allow connections to be over-tightened, resulting in
damage.
NOTICE
Leakage!
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. Properly seal all penetrations in
unit casing.

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.
• Extended drain and vent connections are provided as
standard 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.
Note: Drain and vent connections are optional for
standard coils. Penetrations will not be in the panel;
a pilot hole will be factory-provided if drain and
vent connections are indicated.
CLCH-SVX07K-EN
• 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.
• After completing the piping connections, seal around
pipe from inner panel to outer panel.

Piping for Staggered Coils

• Staggered coils will not come from the factory
installed with any piping, similar to regular coil
sections. Because the air leaving coil is offset from the
exterior unit wall, piping will need to be installed inside
the unit to reach the header. Header penetration holes
will be provided in all walls required. Depending on the
submittal, the same applies to extended drain and
vent.
• Any piping installed inside the unit needs to be
insulated to prevent condensation carryover. These
pipes will be in conditioned air space and very prone to
condensation. This will not be supplied by the factory
and will need to be done by the contractor.
• As the unit is installed, be sure access is considered for
installing any internal piping during the sequence of
events. It may be beneficial to install internal piping
before attaching build sections together."

Drain Pan Trapping

WARNING
No Step Surface!
Failure to follow these instructions could result in death
or serious injury. 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.
NOTICE
Water Damage!
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.
When more than one section has a drain pain, trap
each section individually.
Threaded condensate drain connections are provided on
only one side of the coil section. Pitch the connection lines
horizontal or downward toward an open drain. Trane
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