Installation Manual

35
LOCAL HEATING VALUES FOR NATURAL GAS
ALTITUDE ABOVE
SEA LEVEL
BTU PER CUBIC FOOT
650 700 750 800 850 900 950 1,000 1,050
2,000 FT LOW LOW LOW LOW LOW LOW
HIGH HIGH HIGH
3,000 FT LOW LOW LOW LOW LOW LOW
HIGH HIGH HIGH
4,000 FT LOW LOW LOW LOW LOW
HIGH HIGH HIGH HIGH
5,000 FT LOW LOW LOW LOW LOW
HIGH HIGH HIGH HIGH
6,000 FT LOW LOW LOW LOW
HIGH HIGH HIGH HIGH HIGH
7,000 FT LOW LOW LOW LOW
HIGH HIGH HIGH HIGH HIGH
8,000 FT LOW LOW LOW
HIGH HIGH HIGH HIGH HIGH HIGH
9,000 FT LOW LOW LOW
HIGH HIGH HIGH HIGH HIGH HIGH
10,000 FT LOW LOW
HIGH HIGH HIGH HIGH HIGH HIGH HIGH
Table 10. Natural Gas Heating Values
Table 12. Orifices for Natural Gas
Low Heating Value
LOW HEATING VALUE &
MANIFOLD PRESSURE = 3.5 IN. W.C.
ALTITUDE ABOVE
SEA LEVEL
INPUT (BTU)
45,000 60,000 72,000
0 to 1,999 FT 49 45 47
2,000 to 2,999 FT 49 45 47
3,000 to 3,999 FT 49 45 47
4,000 to 4,999 FT 50 45 47
5,000 to 5,999 FT 50 45 47
6,000 to 6,999 FT 50 46 48
7,000 to 7,999 FT 51 47 48
8,000 to 8,999 FT 51 47 49
9,000 to 9,999 FT 51 48 49
HIGH HEATING VALUE &
MANIFOLD PRESSURE = 3.5 IN. W.C.
ALTITUDE ABOVE
SEA LEVEL
INPUT (BTU)
45,000 60,000 72,000
0 to 1,999 FT 49 45 47
2,000 to 2,999 FT 50 46 48
3,000 to 3,999 FT 50 46 48
4,000 to 4,999 FT 51 47 48
5,000 to 5,999 FT 51 47 49
6,000 to 6,999 FT 51 48 49
7,000 to 7,999 FT 52 48 50
8,000 to 8,999 FT 52 49 50
9,000 to 9,999 FT 52 49 50
Table 11. Orifices for Natural Gas
High Heating Value
Table 9. Orifices for Propane Gas
ORIFICES FOR PROPANE GAS
MANIFOLD PRESSURE = 10 IN. W.C.
ALTITUDE ABOVE
SEA LEVEL
INPUT (BTU)
45,000 60,000 72,000
0 to 1,999 FT 57 55 56
2,000 to 2,999 FT 57 55 56
3,000 to 3,999 FT 57 55 56
4,000 to 4,999 FT 57 56 56
5,000 to 5,999 FT 58 56 56
6,000 to 6,999 FT 59 56 57
7,000 to 7,999 FT 59 56 57
8,000 to 8,999 FT 60 56 57
9,000 to 9,999 FT 61 57 57