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Heat Controller 80+ AFUE Installation Instructions Manual page 33

Single stage high efficiency gas furnaces
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NATURAL GAS w/ HIGH HEATING VALUE
ALTITUDE ABOVE
SEA LEVEL
45,000
49
0 to 1,999 FT
3.5
49
2,000 to 2,999 FT
2.9
49
3,000 to 3,999 FT
2.8
49
4,000 to 4,999 FT
2.6
49
5,000 to 5,999 FT
2.5
51
6,000 to 6,999 FT
3.3
51
7,000 to 7,999 FT
3.0
51
8,000 to 8,999 FT
2.8
51
9,000 to 9,999 FT
2.6
Table 9. High Altitude Deration Chart for Natural Gas - High Heating Value
NATURAL GAS w/ LOW HEATING VALUE
ALTITUDE ABOVE
SEA LEVEL
45,000
49
0 to 1,999 FT
3.5
49
2,000 to 2,999 FT
3.5
49
3,000 to 3,999 FT
3.1
49
4,000 to 4,999 FT
2.9
49
5,000 to 5,999 FT
2.7
49
6,000 to 6,999 FT
2.6
51
7,000 to 7,999 FT
3.4
51
8,000 to 8,999 FT
3.1
51
9,000 to 9,999 FT
2.9
Table 10. High Altitude Deration Chart for Natural Gas - Low Heating Value
INPUT (BTU)
54,000
72,000
90,000
47
47
47
3.5
3.5
3.5
47
47
47
3.2
3.2
3.2
47
47
47
3.0
3.0
3.0
47
47
47
2.8
2.8
2.8
47
47
47
2.7
2.7
2.7
49
49
49
3.5
3.5
3.5
49
49
49
3.3
3.3
3.3
49
49
49
3.0
3.0
3.0
49
49
49
2.8
2.8
2.8
INPUT (BTU)
54,000
72,000
90,000
47
47
47
3.5
3.5
3.5
47
47
47
3.5
3.5
3.5
47
47
47
3.3
3.3
3.3
47
47
47
3.1
3.1
3.1
47
47
47
2.9
2.9
2.9
47
47
47
2.8
2.8
2.8
49
49
49
3.4
3.4
3.4
49
49
49
3.2
3.2
3.2
49
49
49
2.9
2.9
2.9
108,000
126,000
47
47
ORIFICE SIZE
3.5
3.5
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
3.2
3.2
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
3.0
3.0
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
2.8
2.8
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
2.7
2.7
MANIFOLD PRESSURE
49
49
ORIFICE SIZE
3.5
3.5
MANIFOLD PRESSURE
49
49
ORIFICE SIZE
3.3
3.3
MANIFOLD PRESSURE
49
49
ORIFICE SIZE
3.0
3.0
MANIFOLD PRESSURE
49
49
ORIFICE SIZE
2.8
2.8
MANIFOLD PRESSURE
108,000
126,000
47
47
ORIFICE SIZE
3.5
3.5
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
3.5
3.5
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
3.3
3.3
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
3.1
3.1
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
2.9
2.9
MANIFOLD PRESSURE
47
47
ORIFICE SIZE
2.8
2.8
MANIFOLD PRESSURE
49
49
ORIFICE SIZE
3.4
3.4
MANIFOLD PRESSURE
49
49
ORIFICE SIZE
3.2
3.2
MANIFOLD PRESSURE
49
49
ORIFICE SIZE
2.9
2.9
MANIFOLD PRESSURE
33
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