A.O. Smith 120 trough 500 Manuel d'installation télécharger pdf (Page 28)

2. Inspect the venting system for proper size and horizontal

pitch, as required in the National Fuel Gas Code, ANSI Z223.1

or 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 draft hood spillage at the relief opening after 5 minutes

of main burner operation.

6. After it has been determined that each appliance 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.

WARNING

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.

PREVENTIVE MAINTENANCE

CHECK THE PILOT

At least once a year, check the pilot burner, fig. 16, and the main

burner, fig. 17, for proper operation. Refer to the following pilot

and main burner sections.

PILOT BURNER

For access to pilot, unfasten two screws to burner cover and

remove. Locate the burner with pilot and remove screw holding

burner to manifold. Unfasten pilot tubing from valve and slide

out burner and pilot.

Servicing of the pilot burner includes keeping pilot free of lint,

cleaning the burner head, the primary air opening and the orifice

of the pilot burner.

Pilot burner flame is affected by:

1. Low gas pressure.

• Adjust pilot flame by means of the pilot gas adjustment

located on the gas valve. See fig. 18.

• The pilot flame should envelop sensing device with 5/8"

(1.6cm) flame, fig. 17. Remove pilot adjustment cover screw,

fig. 16. Turn inner adjustment screw clockwise to decrease,

or counterclockwise to increase pilot flame. Be sure to replace

cover screw on gas valve after adjustment to prevent possible

gas leakage.

2. Clogged pilot burner orifice.

• Clean or replace orifice. A clogged orifice will restrict

gas flow.

3. Incorrect orifice.

• Replace. See Table 7, for correct orifice for type of gas

used. Orifice size is stamped on the wrench flats.

MAIN BURNER

ASSEMBLY

PILOT BURNER

ASSEMBLY

FIGURE 15

Pilot sensing device must sense a flame before sparking will

stop. Loose wires or a draft may cause intermittent or abnormal

sparking. To eliminate this condition, first correct loose wiring

condition, and then, if necessary, increase pilot flame.

PILOT BURNER ASSEMBLY

FIGURE 16

MAIN BURNER

The main burner, fig. 17, should display the following

characteristics:

• Cause rapid ignition and carry over of flame across entire

burner.

• Give reasonably quiet operation during ignition, burning and

extinction.

• Cause no excessive lifting of flame from burner ports.

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A.O. Smith 120 trough 500 Manuel d'installation Page 28

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