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76
Table 21 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate
S
A
G
L
A
R
U
T
A
N
F
O
Y
T
I
V
A
R
G
C
I
F
I
C
E
P
S
S
A
G
.
G
V
A
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
3.8 / 1.6
42
3.2 / 1.4
42
3.3 / 1.4
42
3.4 / 1.4
0
925
43
3.6 / 1.5
43
3.7 / 1.6
43
3.8 / 1.6
42
3.2 / 1.4
(0)
950
43
3.4 / 1.4
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
975
44
3.7 / 1.6
44
3.8 / 1.6
43
3.4 / 1.5
43
3.6 / 1.5
to
1000
44
3.5 / 1.5
44
3.6 / 1.5
44
3.8 / 1.6
43
3.4 / 1.4
1025
44
3.3 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
2000
1050
44
3.2 / 1.3
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
(610)
1075
45
3.7 / 1.6
45
3.8 / 1.6
44
3.3 / 1.4
44
3.4 / 1.4
1100
46
3.7 / 1.6
46
3.8 / 1.6
45
3.8 / 1.6
44
3.2 / 1.4
U.S.A.
800
42
3.4 / 1.4
42
3.5 / 1.5
42
3.6 / 1.5
42
3.7 / 1.6
2001 (611)
825
43
3.8 / 1.6
42
3.3 / 1.4
42
3.4 / 1.4
42
3.5 / 1.5
to
850
43
3.6 / 1.5
43
3.7 / 1.6
42
3.2 / 1.3
42
3.3 / 1.4
3000 (914)
875
43
3.4 / 1.4
43
3.5 / 1.5
43
3.7 / 1.5
43
3.8 / 1.6
900
44
3.7 / 1.6
44
3.8 / 1.6
43
3.5 / 1.5
43
3.6 / 1.5
Canada
925
44
3.5 / 1.5
44
3.6 / 1.5
44
3.8 / 1.6
43
3.4 / 1.4
2001 (611)
950
44
3.3 / 1.4
44
3.4 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
to
975
44
3.2 / 1.3
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
4500 (1372)
1000
46
3.8 / 1.6
45
3.8 / 1.6
44
3.2 / 1.4
44
3.3 / 1.4
775
42
3.3 / 1.4
42
3.4 / 1.4
42
3.5 / 1.5
42
3.6 / 1.5
3001
800
43
3.8 / 1.6
42
3.2 / 1.4
42
3.3 / 1.4
42
3.4 / 1.4
(915)
825
43
3.6 / 1.5
43
3.7 / 1.6
43
3.8 / 1.6
42
3.2 / 1.4
850
44
3.8 / 1.6
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
875
44
3.6 / 1.5
44
3.7 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
4000
900
44
3.4 / 1.4
44
3.5 / 1.5
44
3.7 / 1.5
44
3.8 / 1.6
(1219)
925
44
3.2 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
950
45
3.7 / 1.6
44
3.2 / 1.3
44
3.3 / 1.4
44
3.4 / 1.4
750
42
3.3 / 1.4
42
3.4 / 1.4
42
3.5 / 1.5
42
3.6 / 1.5
4001
775
43
3.7 / 1.6
43
3.8 / 1.6
42
3.3 / 1.4
42
3.4 / 1.4
(1220)
800
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
43
3.8 / 1.6
825
44
3.8 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
43
3.6 / 1.5
850
44
3.5 / 1.5
44
3.7 / 1.5
44
3.8 / 1.6
43
3.4 / 1.4
5000
875
44
3.3 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
(1524)
900
44
3.2 / 1.3
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
925
46
3.8 / 1.6
45
3.7 / 1.6
44
3.2 / 1.4
44
3.3 / 1.4
725
42
3.2 / 1.4
42
3.3 / 1.4
42
3.4 / 1.5
42
3.5 / 1.5
5001
750
43
3.7 / 1.5
43
3.8 / 1.6
42
3.2 / 1.4
42
3.3 / 1.4
(1525)
775
43
3.4 / 1.4
43
3.5 / 1.5
43
3.7 / 1.5
43
3.8 / 1.6
800
44
3.7 / 1.6
44
3.8 / 1.6
43
3.4 / 1.5
43
3.5 / 1.5
825
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
44
3.8 / 1.6
6000
850
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
(1829)
875
45
3.7 / 1.6
44
3.2 / 1.3
44
3.3 / 1.4
44
3.4 / 1.4
900
46
3.7 / 1.6
46
3.8 / 1.6
45
3.8 / 1.6
44
3.2 / 1.4
675
42
3.4 / 1.4
42
3.5 / 1.5
42
3.6 / 1.5
42
3.8 / 1.6
6001
700
42
3.2 / 1.3
42
3.3 / 1.4
42
3.4 / 1.4
42
3.5 / 1.5
(1830)
725
43
3.6 / 1.5
43
3.7 / 1.6
43
3.8 / 1.6
42
3.3 / 1.4
750
43
3.4 / 1.4
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
775
44
3.6 / 1.5
44
3.7 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
7000
800
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
(2133)
825
44
3.2 / 1.3
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
850
46
3.8 / 1.6
45
3.8 / 1.6
44
3.2 / 1.4
44
3.3 / 1.4
to
to
to
to
TWO-STAGE FURNACE
(TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER,
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE
RANGE
U.
S
.A.
On
ly
ft (m)
U.
S
.A.
a
n
d
C
a
n
a
d
a
U.
S
.A.
On
ly
U.
S
.A.
On
ly
U
.S.A
.
O
nly
U
.S.A
.
a
nd
C
a
na
da
A11252A