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Table 7. Natural Gas Orifice Size. |
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| ELEVATION |
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GAS | Up | 2001 | 3001 | 4001 | 5001 | 6001* | 7001* | 8001* | 9001* |
HEATING | to | to | to | to | to | to | to | to | to |
VALUE** | 2000 | 3000 | 4000 | 5000 | 6000 | 7000 | 8000 | 9000 | 10000 |
(Btu/cu. ft.) | Feet | Feet | Feet | Feet | Feet | Feet | Feet | Feet | Feet |
2.25 | 2.20 | 2.15 | 2.15 | 2.10 | 2.05 | 2.05 | 2.00 | 1.95 | |
2.20 | 2.15 | 2.10 | 2.10 | 2.05 | 2.00 | 2.00 | 1.95 | 1.90 | |
2.15 | 2.10 | 2.05 | 2.05 | 2.00 | 1.95 | 1.95 | 1.90 | 1.85 | |
2.10 | 2.05 | 2.00 | 2.00 | 1.95 | 1.90 | 1.90 | 1.85 | 1.80 | |
2.05 | 2.00 | 1.95 | 1.95 | 1.90 | 1.85 | 1.85 | 1.80 | 1.75 | |
2.00 | 1.95 | 1.90 | 1.90 | 1.85 | 1.80 | 1.80 | 1.75 | 1.75 | |
1.95 | 1.90 | 1.85 | 1.85 | 1.80 | 1.80 | 1.75 | 1.75 | ||
1.90 | 1.85 | 1.85 | 1.80 | 1.75 | 1.75 |
*Above 6000 feet, a
**At standard conditions: 30.0 inches Mercury, 60°F, Saturated.
Table 8. Propane (LP) Gas Orifice Size. |
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GAS |
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| ELEVATION |
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Up | 2001 | 3001 | 4001 | 5001 | 6001* | 7001* | 8001* | 9001* | |
HEATING* | to | to | to | to | to | to | to | to | to |
VALUE | 2000 | 3000 | 4000 | 5000 | 6000 | 7000 | 8000 | 9000 | 10000 |
(Btu/cu. ft.) | Feet | Feet | Feet | Feet | Feet | Feet | Feet | Feet | Feet |
1.20 | 1.15 | 1.15 | 1.15 | 1.15 | 1.10 | 1.10 | 1.10 | 1.05 |
* Above 6000 feet, a
SECTION 17. CHANGING MAIN BURNER ORIFICES
WARNING: To prevent electrical shock and gas leaks, turn off electrical power and gas before changing
orifices.
Follow this procedure:
1.Turn off electricity at electrical disconnect switch next to furnace.
2.Turn off equipment
3.Remove three screws holding burner access panel in place. Remove burner access panel.
4.Starting with burner farthest from gas control, remove main burner screws and main burners. Note how burners overlap. Burner farthest from gas control is on top. See Figure 21.
5.Remove original main burner orifices from manifold pipe.
6.Carefully, hand thread new orifices into manifold pipe. Do not
7.Starting with burner closest to gas control, replace main burners and main burner screws. Burner mounting flange of burner farther from gas control overlaps
Figure 21. Main Burner Removal.
8.Check burner carry-over alignment. Burner carry- overs may touch but not overlap adjacent burner carry- overs. Replace screws .
9.Replace burner access panel using three screws removed in step 3.
10.Open equipment shut-off valve in gas supply line just ahead of furnace.
11.Set room thermostat to highest setting and to heating mode.
12.Turn on electricity at electrical disconnect switch located next to furnace. Furnace will light.
13.Visually check that each burner lights promptly.
14.Check gas input following Section 14, "Checking Gas Input Rate."
15.Reset room thermostat to desired setting.
Installer’s Information Manual | Page 23 |