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Coil 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!
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.
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.
38
•
When attaching the piping to the coil header, make the
connection only tight enough to prevent leaks. Maximum
recommended torque is 200 foot-pounds.
•
Use pipe sealer on all thread connections.
•
After completing the piping connections, seal around pipe
from inner panel to outer panel.
Drain Pan Trapping
WARNING
No Step Surface!
Failure to follow this recommendation could result in
death or serious injury. Do not walk drain pan. Walking
on the drain pan could cause the supporting metal to
collapse, resulting in the operator/technician to fall.
WARNING
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.
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 recommends installing
a plug to facilitate cleaning of the trap. See the table below for
drain connection sizes.
Table 8.
Drain connections
Unit size
3-6
8-21
25-30
Notes:
• Nominal schedule 40 on PVC drain pan.
• Threaded connection size on stainless drain pan.
Figure 44
illustrates the proper trapping, piping, and operation
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.
Connection size
0.75 in.
1.00 in.
1.25 inches
CLCH-SVX009L-EN
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