Trane AM4A0A30S21SA Series User Manual

CLCH-SVX07C-EN 83
Coil Piping and Connections
6. Pitch all supply and return steam piping down 1 inch for every 10 feet in the direction of the
steam or condensate flow.
Note: Do not drain the steam mains or take-offs through the coils. Drain the mains ahead of the
coils through a steam trap to the return line.
7. Ensure overhead returns have 1 psig of pressure at the steam trap discharge for every 2 feet
of elevation for continuous condensate removal.
Water Coil Piping
Figure 73, and Figure 74 illustrate
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.
Figure 73. Typical piping for type 5W one-row water coil
Figure 74. Typical piping for type 5A, 5W two-row, W 3- to 12-row, WD, D1, and
D2 water coils
GV
GV
GV
GV
AV
AV
Water supply
main
Water
return main
Drain
Level
Air flow
AV
AV
AV
GV
Water supply
main
Water
return main
Drain
Air flow
Pitch down

Trane AM4A0A30S21SA Series Specifications

General

Brand	Trane
Model	AM4A0A30S21SA Series
Category	Air Handlers
Language	English