34 McQuay IM 987
Mechanical Installation
Steam Trap Recommendations
1 Size traps in accordance with manufacturers’
recommendations. Be certain that the required pressure
differential will always be available. Do not undersize.
2 Float and thermostatic or bucket traps are recommended
for low pressure steam. Use bucket traps on systems with
on-off control only.
3 Locate traps at least 12" (305 mm) below the coil return
connection.
4 Always install strainers as close as possible to the inlet
side of the trap.
5 A single tap may generally be used for coils piped in
parallel, but an individual trap for each coil is preferred.
Figure 37: Heating Coil Piping with Vestibule
Steam Coil Freeze Conditions
If the air entering the steam coil is below 35°F (2°C), note the
following recommendations:
1 Supply 5 psi (34.5 kPa) steam to coils at all times.
2 Modulating valves are not recommended. Control should
be by means of face and bypass dampers.
3 As additional protection against freeze-up, install the tap
sufficiently far below the coil to provide an adequate
hydrostatic head to ensure removal of condensate during
an interruption on the steam pressure. Estimate 3 ft. (914
mm) for each 1 psi (7 kPa) of trap differential required.
4 If the unit is to be operated in environments with
possible freezing temperatures, an optional freezestat is
recommended. See “Freeze Protection” on page 95 for
additional information.
Figure 38: Valve Assembly
Figure 39: Steam Valve Package
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