Trane UH-PRC001-EN manual Vapor orVacuum System, HotWater System with Circulating Pump

Application Considerations

Figure AC-4

Figure AC-5

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.

Vapor orVacuum 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 toTable AC-2.

HotWater 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.

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.

10 UH-PRC001-EN