Installation and Maintenance Manual

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26 GBNE-SVX001A-EN

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

Operation (continued)

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 8A

Altitude

Manifold Pressure

BTU Output

Natural Gas

Liquid Propane

Feet Meters Inches W.C. Pa Inches W.C. Pa Percentage

0-2,000 0-610 3.5 872 10 2,491 100%

2,001-3,000 611-915 3.2 797 9.2 2,292 96%

3,001-4,000 916-1,220 2.9 722 8.4 2,092 92%

4,001-5,000 1,221-1,525 2.7 673 7.7 1,918 88%

5,001-6,000 1,526-1,830 2.4 598 7 1,744 84%

6,001-7,000 1,831-2,135 2.2 548 6.4 1,594 80%

7,001-8,000 2,136-2,440 2 498 5.7 1,420 76%

8,001-9,000 2,441-2,745 1.8 448 5.1 1,270 72%

9,001-10,000 2,746-3,045 1.6 399 4.6 1,145 68%

Notes: 1. Deration based on ANSI Z223.1 (NFPA 54).

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

3. Table based on heating value of 2,500 BTU/Cu. ft. at sea level.

4. Consult local utility for actual heating value.