Manual A.O. Smith EQ 280 (page 19 of 28) (English)

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2.8 Maintenance

To ensure safe and efficient

operation of the water heater it is

recommended that it is cleaned and

serviced at least once a year by a

qualified competent person.

2.8.1 Sacrificial anode

The life cycle of the anode is

determined by the quality and the

quantity of the water flowing through

the apparatus. It is therefore

recommended that the anode be

inspected and replaced if necessary at

least once a year.

1. Close the stop cock in the cold water

supply pipe.

2. Open the nearest hot water tap in

order to allow the pressure to drop

from the water heater and the pipes.

3. Slacken the anode with a fitting

wrench.

4. Check the anode and replace it if it

has been reduced in diameter by

60% or more at any point on its

length.

5. Check for water leaks.

If it is necessary to replace the

Drawing 10 - Conversion to another gas

anode it should always be replaced by

one of the same type.

The type of anode required can be

determined on the basis of the type of

the appliance and the serial number.

2.8.2 Cleaning

1. Close the gas supply and demount

the burner after it has cooled down;

2. Disconnect the burner, pilot pipe and

thermo couple from the gas control

block (see drawing 11);

3. Remove the complete burner

assembly;

4. Clean the burner with a soft brush;

5. Check the pilot burner and clean it if

so required;

6. Check the combustion chamber, flue

tube and flue baffle and clean these

if required;

7. Re-mount in reverse order. Tighten

the thermo couple connection on the

gas control block hand tight and

tighten it further with a wrench to a

maximum of 1/4 turn as it only needs

to make contact.

After cleaning of the pilot- and main

burner the operation of these should be

checked. If necessary the burner

pressure of the main burner should be

reset.

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A.O. Smith EQ 280 Manual

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