Carrier 58ZAV Furnace User Manual


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→Table 7—Model 58ZAV Orifice Size† and Manifold Pressure for Correct Input
(Tabulated Data Based on 23,000 BTUH Per Burner, Derated 4 Percent per 1000 Ft Above Sea Level)*
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. and Canada
850 41 3.6 41 3.7 41 3.8 40 3.6 40 3.8
875 42 3.8 41 3.5 41 3.6 41 3.7 41 3.8
900 42 3.5 42 3.7 42 3.8 41 3.5 41 3.6
0 925 42 3.4 42 3.5 42 3.6 42 3.7 42 3.8
950 42 3.2 42 3.3 42 3.4 42 3.5 42 3.6
to 975 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
1000 43 3.5 43 3.6 43 3.7 42 3.2 42 3.3
2000 1025 43 3.3 43 3.4 43 3.6 43 3.7 43 3.8
1050 43 3.2 43 3.3 43 3.4 43 3.5 43 3.6
1075 44 3.5 44 3.6 43 3.2 43 3.3 43 3.4
1100 44 3.3 44 3.4 44 3.5 43 3.2 43 3.3
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. and Canada
U.S.A 775 42 3.7 42 3.8 41 3.5 41 3.6 41 3.8
Altitudes 800 42 3.4 42 3.6 42 3.7 42 3.8 41 3.5
2001 825 42 3.2 42 3.3 42 3.5 42 3.6 42 3.7
to 850 43 3.7 43 3.8 42 3.3 42 3.4 42 3.5
3000 875 43 3.5 43 3.6 43 3.7 42 3.2 42 3.3
or 900 43 3.3 43 3.4 43 3.5 43 3.7 43 3.8
Canada 925 43 3.1 43 3.2 43 3.4 43 3.5 43 3.6
Altitudes 950 43 3.0 43 3.1 43 3.2 43 3.3 43 3.4
2000 975 43 2.8 43 2.9 43 3.0 43 3.1 43 3.2
to 1000 43 2.7 43 2.8 43 2.9 43 3.0 43 3.1
4500 1025 43 2.6 43 2.6 43 2.7 43 2.8 43 2.9
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. Only
750 42 3.4 42 3.6 42 3.7 42 3.8 41 3.5
775 42 3.2 42 3.3 42 3.5 42 3.6 42 3.7
800 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
3001 825 43 3.5 43 3.6 43 3.7 43 3.8 42 3.2
850 43 3.3 43 3.4 43 3.5 43 3.6 43 3.7
to 875 43 3.1 43 3.2 43 3.3 43 3.4 43 3.5
900 43 2.9 43 3.0 43 3.1 43 3.2 43 3.3
4000 925 43 2.8 43 2.9 43 3.0 43 3.0 43 3.1
950 43 2.6 43 2.7 43 2.8 43 2.9 43 3.0
975 43 2.5 43 2.6 43 2.7 43 2.7 43 2.8
1000 43 2.4 43 2.4 43 2.5 43 2.6 43 2.7
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. Only
725 42 3.2 42 3.3 42 3.5 42 3.6 42 3.7
750 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
775 43 3.4 43 3.6 43 3.7 43 3.8 42 3.2
4001 800 43 3.2 43 3.3 43 3.5 43 3.6 43 3.7
825 43 3.0 43 3.1 43 3.2 43 3.4 43 3.5
to 850 43 2.9 43 3.0 43 3.1 43 3.2 43 3.3
875 43 2.7 43 2.8 43 2.9 43 3.0 43 3.1
5000 900 43 2.6 43 2.6 43 2.7 43 2.8 43 2.9
925 43 2.4 43 2.5 43 2.6 43 2.7 43 2.8
950 43 2.3 43 2.4 43 2.5 43 2.5 43 2.6
* For size 135-20 only, input is 22,500 Btuh per burner. Deduct 0.1-in. wc from manifold pressure shown in table. Change orifice size if manifold pressure falls below
3.2-in. wc on altitudes up to 2000 ft, otherwise change orifice size if manifold pressure falls below 2.0-in. wc.
† Orifices sizes shown in BOLD are factory installed.
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