Sterling TF-125, TF-400, TF-150, TF-300, TF-200, TF-350 Tubular Unit Heater High Altitude Deration

TUBULAR UNIT HEATER

HIGH ALTITUDE DERATION

This Tubular Unit Heater has been manufactured utilizing standard burner orifices and a normal manifold pressure setting as per the specifications shown on your unit rating plate.

All unit deration must be done through field adjustments by a qualified technician. Once the proper adjustments are made in the field, attach label #J17-06459 to the unit, and record adjusted manifold pressure, altitude of the unit installation and the technician’s name and date on the label using a permanent marker.

Refer to Installation Instruction section on Adjustments- Gas Input Rate for adjusting the manifold pressure.

Table 5A

	NATURAL GAS		PROPANE (LP) GAS
	Heating*	Manifold	Heating*	Manifold
Altitude	Value	Pressure	Value	Pressure
(Feet)	BTU/Cu. ft.	(In. W.C.)	BTU/Cu. ft.	(In. W.C.)
2,000	948	3.5	2,278	8.6
2,500	931	3.5	2,237	8.5
3,000	914	3.3	2,196	8.4
3,500	897	3.2	2,156	8.4
4,000	881	3.2	2,116	8.3
4,500	865	3.2	2,077	8.2
5,000	849	3.1	2,039	8.1
5,500	833	3.1	2,000	8.0
6,000	818	3.0	1,964	7.9
6,500	802	3.0	1,927	7.7
7,000	787	2.9	1,891	7.6
7,500	771	2.9	1,853	7.5
8,000	756	2.8	1,817	7.4
8,500	741	2.8	1,781	7.2
9,000	726	2.7	1,745	7.1
9,500	711	2.7	1,709	6.9
10,000	696	2.6	1,673	6.8

*Notes:

1.Consult local utility for actual heating value.

2.Tables based on heating value of 1,050 BTU/Cu. ft. at sea level.

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