Water Coil Piping - Trane Performance Climate Changer Installation, Operation And Maintenance Manual

6. Pitch all supply and return steam piping down 1 inch for every 10 feet in the direction of the
Note: Do not drain the steam mains or take-offs through the coils. Drain the mains ahead of the
7. Ensure overhead returns have 1 psig of pressure at the steam trap discharge for every 2 feet

Water Coil Piping

Figure 73, and Figure 74
typical water coil piping configurations.
Type 5A, 5W, D1, W, UW, TT, P ,2, P4, and
P8 water coils are self-venting only if
the water velocity exceeds 1.5 feet per
second (fps) in the coil tubes. Type D2,
UA, UU, and WD water coils are self-
venting only if the water velocity
exceeds 2.5 fps in the coil tubes. See the
unit submittals for coil water velocity. If
the water velocity is below these
minimums, vent the coil by one of the
following methods:
1. Install an air vent in the top pipe
plug tapping of the return header.
2. When the return line rises above the
top of the coil, vent from the top of
the return header horizontally to the
return piping.
Note: TT coils are designed with larger
than normal end tube sheet
holes to allow for maximum
expansion. Air leakage around
tubes should be expected and
handled by capping over coil
ends or by sealing around tubes
with a pliable sealant such as
silicone.
CLCH-SVX07C-EN
steam or condensate flow.
coils through a steam trap to the return line.
of elevation for continuous condensate removal.
Figure 73. Typical piping for type 5W one-row water coil
illustrate
GV
Figure 74. Typical piping for type 5A, 5W two-row, W 3- to 12-row, WD, D1, and
D2 water coils
Drain
Coil Piping and Connections
GV
AV
AV
GV
GV
Drain
GV
AV
AV
AV
Water supply
main
Water
return main
83