Check Venting
The following steps shall be followed with each appliance connected to the venting system placed in operation, while any other appliances connected to the venting system are not in operation.
1.Seal any unused openings in the venting system.
2.Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1or the CAN/CGA B149 Installation Codes and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
3.So far as is practical, close all building doors and windows and all doors between the space in which the water heater(s) connected to the venting system are located and other spaces of the building. Turn on all appliances not connected to the venting system. Turn on all exhaust fans, such as range hoods and bathroom exhausts, so they shall operate at maximum speed. Close fireplace dampers.
4.Follow the lighting instruction. Place the water heater being inspected in operation. Adjust thermostat so appliance shall operate continuously.
5.Test for spillage at the burner level after 5 minutes of main burner operation.
6.After it has been determined that each water heater connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous conditions of use.
7.If improper venting is observed during any of the above tests, the venting system must be corrected.
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR CONTAMINATION AND UNSAFE CONDITIONS.
•If the back draft cannot be corrected by the normal method or if a suitable draft cannot be obtained, a blower type flue gas exhauster must be employed to assure proper venting and correct combustion.
Check the Igniter Assembly
At least once a year, check the igniter assembly, Figure 23, and the main burner, Figure 24, for proper operation. Refer to the
following igniter assembly and main burner sections.
FIGURE 23
Main Burner
The main burner, figure 24, should display the following characteristics:
•Cause rapid ignition and carry across entire burner.
•Give reasonably quiet operation during ignition, burning, and extinction.
•Cause no excessive lifting of flame from burner ports.
FIGURE 24
If the preceding burner characteristics are not evident, check for accumulation of lint, scale or other foreign debris that restricts or blocks the air openings to the burner or heater.
NOTE:
1.Remove main burners from unit.
2.Check that burner venturi and ports are free of foreign debris.
3.Clean burners with bristle brush and/or vacuum cleaner - DO NOT distort burner ports or pilot location.
4.Reinstall burners in unit. Make sure front and rear of burners are installed correctly in burner support brackets.
Also check for good flow of combustion and ventilating air to the unit. Maintain a clear area around the heater at all times.
Gas Valves
Figure 25 shows the type of combination manual gas control valve and regulator used on these heaters.
If the gas valve becomes defective, repairs should not be attempted. A new valve should be installed in place of the defective one.
Igniter Assembly
For access to igniter assembly, unfasten two screws to burner cover and remove. Locate the burner with the igniter assembly and remove screw holding burner to manifold. Slide burner out to access igniter assembly.
Servicing of the igniter assembly includes keeping the igniter free |
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of lint, scale or any other foreign debris. | FIGURE 25 |
25