GSW 72090 External Cleaning of the Flame-arrester, Resetting and Replacing the Safety TCO Switch

Note: Visually inspect the flame arrester by placing a mirror underneath the water heater. A flashlight can be used to illu- minate the slots in the flame arrester if necessary. Routine cleaning of the flame arrester is recommended if inspection shows accumulation of debris on the flame arrester. See section titled “External Cleaning of the Flame-arrester” for cleaning instructions.

Important: Verify proper operation after servicing this water heater. If you are unsure of this inspection procedure or the proper operation of the water heater and its special safety features, enlist the services of a qualified service technician.

4.Verify if the quick connects are firmly inserted in the TCO switch contacts.

5.Replace the outer door.

6.Restart the water heater following the “Operating Instructions”.

7.If the pilot burner does not stay lit after several attempts it is possible that the TCO embedded in the safety switch opened due to a flammable vapor incident or the TCO switch was severely damaged. Do not attempt to further operate the water heater. Call a qualified service technician.

External Cleaning of the

Flame-arrester

Important: It is recommended that the flame arrester be visually inspected periodically for accumulation of dust, lint and other debris, especially if the heater is installed in areas having a high dust and/or lint content. Any such accumula- tion should be cleaned as outlined below.

1.Use a vacuum cleaner to remove all loose debris in the flame arrester.

2.If necessary, a soft bristle brush can be used to dis- lodge any remaining debris.

3.Repeat step 1 as necessary to completion.

FLAME

ARRESTER

Figure 16 Flame Arrester (External View)

Resetting and Replacing the Safety (TCO) Switch

The water heater safety system includes a door-mount, manual resettable, safety switch which is designed to dis- able the gas control/thermostat in the event of excessive combustion chamber temperatures. The excessive combus- tion chamber temperatures may be generated by accumu- lation of lint and dust on the flame-arrester (located under- neath the combustion chamber),

1.Follow first the procedure outlined in "External Cleaning of the Flame-arrester".

2.Remove the outer door and locate the TCO switch on the right side of the combustion chamber door.

3.Manually press the contact located on the front-right side of the TCO switch (Figure 17) until a click sound is generated. Do not use a metal tool or a screwdriver to press the TCO switch contact.

THERMAL

LINK

TCO

RESET

CONTACT

Figure 17 TCO Switch

Temperature and Pressure Relief Valve

Manually operate the temperature and pressure relief valve at least once a year to make sure it is working properly. To prevent water damage, the valve must be properly connect- ed to a discharge line which terminates at an adequate drain. Standing clear of the outlet (discharged water may be hot), slowly lift and release the lever handle on the temper- ature and pressure relief valve (see Figure 18) to allow the valve to operate freely and return to its closed position. If the valve fails to completely reset and continues to release water, immediately shut off the manual gas shut-off valve and the cold water inlet and call a qualified service techni- cian.

TEMPERATURE AND

PRESSURE RELIEF VALVE

MANUAL RELIEF VALVE

DISCHARGE LINE TO DRAIN

Figure 18 T&P Relief Valve Test

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