Operating instructions
AVG. GAS SPECIFIC GRAVITY OF NATURAL GAS
HEAT VALUE 0.58 0.60 0.62 0.64
AT ALTITUDE Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
(Btu/cu ft) No. High/Low No. High/Low No. High/Low No. High/Low
900 43 3.5 / 1.5 43 3.6 / 1.5 43 3.8 / 1.6 42 3.2 / 1.3
925 44 3.8 / 1.6 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
0 950 44 3.6 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5
975 44 3.4 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6
to 1000 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5
1025 45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4 44 3.4 / 1.5
2000 1050 45 3.6 / 1.5 45 3.7 / 1.6 45 3.8 / 1.6 44 3.3 / 1.4
1075 45 3.4 / 1.4 45 3.5 / 1.5 45 3.7 / 1.5 45 3.8 / 1.6
1100 45 3.3 / 1.4 45 3.4 / 1.4 45 3.5 / 1.5 45 3.6 / 1.5
U.S.A
.
800 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4 42 3.5 / 1.5
Altitudes 825 43 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6 42 3.2 / 1.4
2001 850 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
to 3000 875 44 3.7 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5
or 900 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6
Canada 925 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5
Altitudes 950 45 3.7 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4 44 3.4 / 1.4
2001 975 45 3.6 / 1.5 45 3.7 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4
to 4500 1000 45 3.4 / 1.4 45 3.5 / 1.5 45 3.6 / 1.5 45 3.7 / 1.6
775 43 3.7 / 1.6 42 3.2 / 1.3 42 3.3 / 1.4 42 3.4 / 1.4
3001 800 43 3.5 / 1.5 43 3.6 / 1.5 43 3.8 / 1.6 42 3.2 / 1.3
825 44 3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5 43 3.7 / 1.5
to 850 44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6 43 3.4 / 1.5
875 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6
4000 900 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
925 45 3.7 / 1.5 45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4
950 45 3.5 / 1.5 45 3.6 / 1.5 45 3.7 / 1.6 45 3.8 / 1.6
750 43 3.7 / 1.6 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4
4001 775 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6
800 44 3.7 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5
to 825 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6 43 3.4 / 1.4
850 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5
5000 875 45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4 44 3.4 / 1.5
900 45 3.6 / 1.5 45 3.7 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4
925 45 3.4 / 1.4 45 3.5 / 1.5 45 3.6 / 1.5 45 3.7 / 1.6
725 43 3.6 / 1.5 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4
5001 750 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5 43 3.8 / 1.6
775 44 3.7 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5
to 800 44 3.4 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6
825 44 3.2 / 1.4 44 3.3 / 1.4 44 3.4 / 1.5 44 3.6 / 1.5
6000 850 45 3.7 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4 44 3.4 / 1.4
875 45 3.5 / 1.5 45 3.6 / 1.5 45 3.7 / 1.6 45 3.8 / 1.6
900 45 3.3 / 1.4 45 3.4 / 1.4 45 3.5 / 1.5 45 3.6 / 1.5
675 42 3.2 / 1.3 42 3.3 / 1.4 42 3.4 / 1.4 42 3.5 / 1.5
6001 700 43 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6 42 3.3 / 1.4
725 44 3.8 / 1.6 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
to 750 44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6 43 3.5 / 1.5
775 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6
7000 800 45 3.8 / 1.6 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
825 45 3.6 / 1.5 45 3.7 / 1.6 45 3.8 / 1.6 44 3.3 / 1.4
850 45 3.4 / 1.4 45 3.5 / 1.5 45 3.6 / 1.5 45 3.7 / 1.6
TABLE 12 - ORIFICE SIZE* AND MANIFOLD PRESSURES FOR GAS INPUT RATE
(TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER,
DERATED 2%/1000 FT ABOVE SEA LEVEL)
ALTITUDE
RANGE
(ft)
* Orifice numbers shown inBOLD are factory-installed.
U.S.A. and Canada U.S.A. and CanadaU.S.A. OnlyU.S.A. OnlyU.S.A. OnlyU.S.A. Only
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