Trane UH-PRC001-EN manual Model S, Model P, Selection Procedure

Selection Procedure

Model S

Maximum mounting heights for Model S Unit Heaters are given inTable SP-1. When equipped with standard Louver Fin Diffusers the distance of throw may be increased as much as 25% by “toeing- in” the vertical blades. Distance of throw decreases in proportion to the amount of deflection given the airstream to either side of the heater.

Mounting the unit at or below maximum mounting height will insure that heated air reaches the living zone.

Model P

Maximum mounting heights for Model P Unit Heaters are given inTable SP-10, page 19.These distances are figured from the floor line to the bottom plate of the unit heater.

Where ceilings are unusually low, a nearly horizontal flow of air can be obtained by equipping these units with Louver Cone Diffusers.The individually adjustable blades of the Louver Cone permit an infinite variety of adjustments to meet any on-the-job problems. By setting the blades vertically to straighten the airstream, as much as 45% increase in throw can be obtained.

Table SP-2 – Factors for Determining Steam Capacity of Model S Horizontal Unit Heaters atVarious Pressures andTemperatures

Table Based on 2 PSIG and 60 F Entering Air

Steam						Temperature of Entering Air (F)
Pressure PSIG		-10	0	10	20	30	40	50	60	70	80	90	100
	0	1.54	1.45	1.37	1.27	1.19	1.11	1.03	0.96	0.88	0.81	0.74	0.67
	2	1.59	1.50	1.41	1.32	1.24	1.16	1.08	1.00	0.93	0.85	0.78	0.71
	5	1.64	1.55	1.46	1.37	1.29	1.21	1.13	1.05	0.97	0.90	0.83	0.76
Blow-	10	1.73	1.64	1.55	1.46	1.38	1.29	1.21	1.13	1.06	0.98	0.91	0.84
Through	15	1.80	1.71	1.61	1.53	1.44	1.34	1.28	1.19	1.12	1.04	0.97	0.90
Type	20	1.86	1.77	1.68	1.58	1.50	1.42	1.33	1.25	1.17	1.10	1.02	0.95
	30	1.97	1.87	1.78	1.68	1.60	1.51	1.43	1.35	1.27	1.19	1.12	1.04
	40	2.06	1.96	1.86	1.77	1.68	1.60	1.51	1.43	1.35	1.27	1.19	1.12
	50	2.13	2.04	1.94	1.85	1.76	1.67	1.58	1.50	1.42	1.34	1.26	1.19
	60	2.20	2.09	2.00	1.90	1.81	1.73	1.64	1.56	1.47	1.39	1.31	1.24
	70	2.26	2.16	2.06	1.96	1.87	1.78	1.70	1.61	1.53	1.45	1.37	1.29
	75	2.28	2.18	2.09	1 .99	1.90	1.81	1.72	1.64	1.55	1.47	1.40	1.32

Notes:

To determine the Btu per hour capacity of a Model S Horizontal Unit Heater at any steam pressure and entering air temperature multiply rated capacity at 2 psig steam 60 F entering air (Table SP-3) by factor from above table. Factors in italics: Units should not be operated when entering air is below freezing at steam pressures below 10 psig.

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