34
MUA-SVX004B-EN
Table 5. Main Burner Orifice Schedule*
93
42
116
42
140
42
163
42
186
42
210
42
233
42
280
42
302
43
326
42
372
42
40
54
50
54
60
54
70
54
80
54
90
54
100
54
120
54
130
55
140
54
160
54
93
42
116
42
140
42
163
42
186
42
210
42
233
42
280
42
280
42
326
42
326
42
372
42
*
INPUT
IN
1000
BTU
2500 BTU/Ft
3
(
93.1 MJ/m
3
)
PROPANE
TYPE OF GAS
NATURAL
HEATING VALUE
1075 BTU/Ft
3
(40.1 MJ/m
3
)
3.5 inch WC
(0.87kPA)
10 inch WC
(2.49 kPA)
NUMBER
OF
BURNER
ORIFICES
MANIFOLD
PRESSURE
40
54
50
54
60
54
70
54
80
54
90
54
100
54
120
54
120
54
140
54
140
54
160
54
P/G
100
P/G
125
P/G
150
P/G
175
P/G
200
P/G
225
P/G
250
P
300
G
300
P
350
G
350
P/G
400
4
5
6
7
8
9
10
12
12
14
14
16
FT
3
/
HR
ORIFICE DRILL
2500 BTU/Ft
3
(93.1 MJ/m
3
)
PROPANE
NATURAL
1075 BTU/Ft
3
(40.1 MJ/m
3
)
3.5 inch WC
(0.87kPA)
10 inch WC
(2.49 kPA)
HIGH TEMP. RISE
FURNACE (30°-90°F)
STD. TEMP. RISE
FURNACE (20°-60°F)
NOT AVAILABLE
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
FT
3
/
HR
ORIFICE DRILL
Notes:
•
P = Power Vented Duct Furnaces, G = Gravity Vented Duct Furnaces
•
* This schedule is for units operating within the U.S.A. at normal altitudes of 2000 ft. (610m) or less.
For altitudes above 2,000 ft., refer to local codes, or in absence of local codes, refer to the latest edition
of the National Fuel Gas Code ANSI Standard Z223.1 (NFPA no. 54).
When installed in Canada, any references to deration at altitudes in excess of 2000 feet (610m) are to
be ignored. At altitudes of 2000 to 4500 feet (610 to 1372m), the unit heaters must be orificed to 90%
of the normal altitude rating, and be so marked in accordance with the ETL certification.
