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UH-PRC001-EN10
Vapor or Vacuum System
Lower supply and return mains are used.
Piping should be similar to that used with
overhead supply main if it is separately
vented and trapped. Bottom supply for
steam mains may be used if steam is dry.
Refer to Figure AC-4. For proper pipe size,
refer to Table AC-2.
High Pressure Steam System
Overhead supply and return mains are
used. The top of the bucket trap must be
located below bottom return outlet of coil
for complete drainage of condensate.
Refer to Figure AC-6.
Table AC-1 - Model P Coil Face Area
Unit Numbers Fin Area In Sq. Ft
42-P & P-L 1.20
64-P & P-L 1.49
80-P & P-L 1.98
102-P & P-L 3.28
122-P & P-L 3.28
146-P & P-L 3.88
166-P & P-L 4.85
202-P & P-L 4.85
252-P & P-L 6.52
280-P & P-L 6.52
336-P & P-L 6.52
384-P & P-L 7.82
500-P & P-L 8.72
600-P & P-L 11.63
720-P & P-L 13.08
Table AC-2 - Supply and Return Sizes at 2 Psi
Capacity In Lbs. Of Size Of Size Of
Steam Per Hour Supply Gravity Return
39 1” 3/4”
87 1 1/4” 3/4”
134 1 1/2” 1”
272 2” 1 1/4”
449 2 1/2” 1 1/2”
822 3” 2”
Note: This table is based on 1/2 lb. drop per 100 ft. of
equivalent run of steam line and approximately 1/4 lb. drop
in the return line per 100 ft. increase steam run-outs one
size if more than 8 ft. long.
Hot Water System with Circulating
Pump
Lower supply and return mains are
shown. Overhead supply and return
main connections, similar to those in
Figure AC-2 may be used. The automatic
air vent is shown here but a manual vent
(pet cock) may be substituted. Refer to
Figure AC-5.
Application
Considerations
Figure AC-4
Figure AC-5
Figure AC-6