Installation
unless the condensate is drained by gravity into a receiver, vented to atmosphere, and returned to the condensate pump.
6Pitch 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
7Ensure 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 30 through Figure 32 illustrate typical water coil piping configurations.
Type WA, 5A, 5W, D, K, 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 UU, WD, and 5D 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:
•Install an air vent in the top pipe plug tapping of the return header.
•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: T, ST, and 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 30. Typical piping for type 5W one-row water coil
Figure 31. Typical piping for type 5A, 5W two-row, K, W 3- to 12-row, WD, D, and DD water coils
Figure 32. Typical piping for type W or WA 1-row water coil
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