2 Maintenance (continued)
Access to the burners will require the following steps: Checking combustion air pressure
1.Turn off main electrical power to the appliance.
2.Turn off main manual gas shutoff to the appliance.
3.Remove the upper and lower outer front access doors.
4.Disconnect the manifold(s) from the gas train using the union(s) just below each gas valve.
5.Disconnect the wiring to the hot surface igniter(s) and ground.
6.Disconnect burner pressure line at burner.
7.Remove the screws from the manifold mounting bracket(s) and remove the manifold(s).
8.Remove the screws from the burner mounting flanges and slide the burner(s) out toward the front of the unit. Use caution to prevent damage to the burners, refractory, hot surface igniter, and wiring.
9.Remove soot from the burners with a stiff bristle brush. Dirt may be removed from the burner ports by rinsing the burner thoroughly with water. Drain and dry burners before
10.Reassemble in reverse order.
NOTICE | When installed in a dusty and dirty location, |
| the burners may require cleaning on a 3 to 6 |
| |
| month schedule or as needed, based on the |
| severity of contamination. Contaminants |
| can be drawn in with the combustion air. |
| |
| dust, dirt, concrete dust, or drywall dust can |
| bloc burner ports and cause |
| failure. The standard inlet air filter will help |
| eliminate dust and dirt from entering the |
| unit. |
The combustion air fans are factory
NOTICE | On the 399,999 - 750,000 Btu/hr models, | |
the air shutter is adjusted to the side of the | ||
| ||
| fan as depicted in FIG. | |
| - 2,070,000 Btu/hr models, the air shutter is | |
| adjusted by sliding the arm located on the | |
| front of the air box as depicted in FIG. |
Check for proper installation and draft in the venting system prior to any adjustments. Correct as needed.
Figure
LESS AIR
MORE AIR
AIR SHUTTER
Figure
NOTICE
While burners are removed, check the heat exchanger surface for sooting. If present, the heat exchanger must be cleaned. Reference the Heat Exchanger Cleaning procedures in this manual.
MORE AIR
LESS AIR
AIR SHUTTER
ADJUSTING BRACKET
29