Trane GRAA Installation, Operation And Maintenance Manual page 34

L L i i g g h h t t i i n n g g
Table 5. Main Burner Orifice Schedule*
Notes:
34
STD. TEMP. RISE
FURNACE (20°-60°F)
TYPE OF GAS NATURAL
*
1075 BTU/Ft
HEATING VALUE
INPUT
(40.1 MJ/m
IN
1000
MANIFOLD
3.5 inch WC
PRESSURE
BTU
(0.87kP A)
3
P/G FT /HR
100 ORIFICE DRILL
3
P/G FT /HR 116
125 ORIFICE DRILL
FT 3 /HR
P/G 140
150 ORIFICE DRILL
FT 3 /HR
P/G 163
175 ORIFICE DRILL
FT 3 /HR
P/G 186
200 ORIFICE DRILL
3
P/G FT /HR 210
225 ORIFICE DRILL
3
FT /HR
P/G 233
ORIFICE DRILL
250
FT 3 /HR
P 280
ORIFICE DRILL
300
FT 3 /HR
G 280
ORIFICE DRILL
300
FT 3
P /HR 326
ORIFICE DRILL
350
G 3 326
FT /HR
350 ORIFICE DRILL
3
P/G FT /HR 372
ORIFICE DRILL
400
• 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.
PROPANE
3 3
2500 BTU/Ft
NUMBER
3 ) (93.1 MJ/m 3 )
OF
10 inch WC
BURNER
(2.49 kP A)
ORIFICES
93 40
4
42 54
50
5
42 54
60
6
42 54
70
7
42 54
80
8
42 54
90
9
42 54
100
10
42 54
120
12
42 54
120
12
42 54
140
14
42 54
140
14
42 54
160
16
42 54
HIGH TEMP. RISE
FURNACE (30°-90°F)
NATURAL PROPANE
3 3
1075 BTU/Ft 2500 BTU/Ft
(40.1 MJ/m 3 ) (93.1 MJ/m 3 )
10 inch WC
3.5 inch WC
(2.49 kPA)
(0.87kPA)
93 40
42 54
116 50
42 54
140 60
42 54
163 70
42 54
186 80
42 54
210 90
42 54
233 100
42 54
NOT AVAILABLE
280 120
42 54
302 130
43 55
326 140
42 54
372 160
42 54
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