Sterling TF - Manual (Page 20)

20
TUBULAR UNIT HEATER
HIGH ALTITUDE DERATION
This Tubular Unit Heater has been manufactured utilizing
standard burner orifi ces and a normal manifold pressure
setting as per the specifi cations shown on your unit rating
plate.
All unit deration must be done through fi eld adjustments
by a qualifi ed technician. Once the proper adjustments
Table 6A
Altitude
Manifold Pressure
BTU Output 1
Natural Gas 2 Liquid Propane 3
Feet Meters Inches WC Pa Inches WC 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. feet at sea level.
3. Table based on heating value of 2,500 BTU/Cu. feet at sea level.
4. Consult local utility for actual heating value.
Altitude
Manifold Pressure
BTU Output 1
Natural Gas 2 Liquid Propane 3
Feet Meters Inches WC Pa Inches WC 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%
4,001-4,500 1,221-1,371 2.8 697 7.9 1,968 90%
Notes: 1. Deration based on CGA 2.17-M91
2. Table based on heating value of 1,050 BTU/Cu. feet at sea level.
3. Table based on heating value of 2,500 BTU/Cu. feet at sea level.
4. Consult local utility for actual heating value.
High Altitude Deration - United States
High Altitude Deration - Canada
are made in the fi eld, 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.