Piping and Connections
CLCH-SVX013B-EN
45
Water Coil Piping
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 61.
Typical piping for type 5W one-row water
coil
GV
GV
GV
AV
AV
Water supply
main
Water
return main
Drain
Lev
el
Airflow
Figure 62.
Typical piping for type 5A, 5W two-row, W 3-
to 12-row, WD, D1, and D2 water coils
AV
AV
AV
GV
Water supply
main
Water
return main
Drain
Pitch down
Airflo
w
Figure 63.
Typical piping for stacked water coils
Pitch down
AV
AV
AV
Wate
r
supply main
Water
return main
GV
Drain
Airflow
GV
MV
Summary of Contents for Performance Climate Changer PSCA
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