Installation and Maintenance Manual

Start-Up
42 GTND-SVX01B-EN
Ta b l e 10 . All unit sizes: Tubular unit heater high altitude
manifold pressure
Altitude
(ft)
Natural Gas Propane (LP) Gas
Heating
(a)
Value
(Btu/ ft
3
)
(a)Consult local utility for actual heating value. Table based on heating val-
ue of 1,050 Btu/ft
3
at sea level.
Manifold
Pressure (in. wc)
Heating(a
) Value
(Btu/ ft
3
)
Manifold Pressure
(in. wc)
Unit Sizes Unit Sizes
30–120 150–400 30–120 150–400
2,000 948 3.5 3.5 2,278 10.0 8.6
2,500 931 3.5 3.5 2,237 10.0 8.5
3,000 914 3.5 3.3 2,196 10.0 8.4
3,500 897 3.4 3.2 2,156 10.0 8.4
4,000 881 3.4 3.2 2,116 10.0 8.3
4,500 865 3.4 3.2 2,077 9.9 8.2
5,000 849 3.3 3.1 2,039 9.7 8.1
5,500 833 3.3 3.1 2,000 9.6 8.0
6,000 818 3.2 3.0 1,964 9.5 7.9
6,500 802 3.2 3.0 1,927 9.3 7.7
7,000 787 3.1 2.9 1,891 9.2 7.6
7,500 771 3.1 2.9 1,853 9.0 7.5
8,000 756 3.1 2.8 1,817 8.9 7.4
8,500 741 3.0 2.8 1,781 8.7 7.2
9,000 726 2.9 2.7 1,745 8.5 7.1
9,500 711 2.9 2.7 1,709 8.3 6.9
10,000 696 2.8 2.6 1,673 8.1 6.8