Coil Piping And Connections - Trane CLCH-IM-16A Installation And Maintenance Manual

Units With More Than One Drain Pan
With the T-Series Climate Changer, each section can
be ordered with or without a drain pan. When more
than one section has a drain pan, you must trap each
section individually. Connecting all drains to a
common line with only one trap will result in
condensate retention, and possible water damage to
the air handler or adjoining space.
If a section has a drain pan for cleaning purposes
only, it does not need a trap; however a cap or shut
off valve should be installed on the drain connection.
Only sections handling condensate, such as a
cooling coil section or eliminator section, require a
trap. Figure 28 through Figure 37 are examples of
typical installations.

Coil Piping And Connections

See Table 27 through Table 29 for connection sizes.
For supply, vent and drain connections, refer to
Figure 28 through Figure 37 .
NOTE: DRAIN AND VENT CONNECTIONS ARE
PROVIDED AS STANDARD ON UW, UU, DD, AND D
COILS ONLY. ALL OTHERS, IF REQUIRED, MUST BE
FIELD INSTALLED.
NOTE: DRAIN AND VENT CONNECTIONS ON THE UU
AND UW COILS ARE RECESSED. IF EXTENDED
DRAINS AND VENTS ARE REQUIRED, THEY MUST BE
FIELD PROVIDED.
General Coil Piping Recommendations
Proper installation, piping and trapping is necessary
to ensure satisfactory coil operation and to prevent
operational damage.
q Support all piping independently of the coils.
q Provide swing joints or flexible fittings on all
connections that are adjacent to heating coils in
order to absorb thermal expansion and
contraction strains.
q If ordered with factory mounted controls, install
the control valves. The valves ship separately in
Table 27
Shipping Coil Water and Steam Connection Sizes
Coil Type Header Height
W, WA 18, 24, 30, 33
W 42, 48, 54
D, DD, WD, K 18, 24, 30, 33
P2 18, 24, 30
32
NOTE: WHEN USING ELECTRONIC VALVE
ACTUATORS ON CHILLED WATER VALVES, THE
VALVE SHOULD BE MOUNTED ABOVE THE
HORIZONTAL POSITION TO PREVENT COLLECTION
OF CONDENSATE IN THE ACTUATOR ELECTRONIC
CIRCUITS AND SUBSEQUENT ACTUATOR FAILURE.
WHEN USING ELECTRONIC VALVE ACTUATORS ON
HOT WATER OR STEAM COILS, THE ACTUATOR
SHOULD BE INSTALLED APPROXIMATELY 45
DEGREES FROM VERTICAL. VERTICAL
INSTALLATION OF A VALVE ACTUATOR ON A HOT
WATER OR STEAM COIL WILL EXPOSE THE
ACTUATOR TO HIGH TEMPERATURES, RESULTING
IN ACTUATOR FAILURE.
THE EXTERNAL CABINET IS ONLY SUFFICIENTLY
SIZED FOR HOUSING COIL PIPING. ALL VALVES AND
VALVE ACTUATORS MUST BE LOCATED
ELSEWHERE.
For best results, The Trane Company recommends
that a short pipe nipple be used on the coil headers
prior to making any welded flange or welded elbow
type connections.
IMPORTANT: TEFLON TAPE OR PIPING COMPOUND
SHOULD NOT BE USED FOR ANY FIELD
CONNECTIONS BECAUSE ITS HIGH LUBRICITY MAY
ALLOW CONNECTIONS TO BE OVER-TIGHTENED,
RESULTING IN DAMAGE TO THE COIL HEADER.
NOTE: USE A BACK-UP WRENCH WHEN ATTACHING
PIPING TO COILS WITH TUBE HEADER
CONSTRUCTION TO PREVENT DAMAGE TO THE COIL
HEADER. DO NOT USE BRASS CONNECTORS. BRASS
DISTORTS EASILY AND COULD CAUSE CONNECTION
LEAKS.
When attaching the piping to the coil header, make
the connection only tight enough to prevent leaks.
Maximum recommended torque is 200 pound-feet.
Use pipe sealer on all thread connections.
After completing the piping connections, use mastic
to seal between the pipe and casing before insulating
the pipe.
Supply Return
2-1/2 2-1/2
2-1/2 2-1/2
2-1/2 2-1/2
3/4 3/4
the unit. The contractor should supply the pipe
nipples, couplings, etc.for installation.
Drain/Vent
1/2
1/2
1/2
1/2
CLCH-IM-16A