Bedienungsanleitung A.O. Smith COF 315 (Seite 20 von 28) (Englisch)

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control again as soon as the high-limit thermostat is

deactivated.

If the overheating cut-out is activated, it must be reset

manually after the water has cooled down. Upon

resetting, the water heater will resume its operation in the

usual way.

2.5 Setting the nominal load

This section is only applicable, if the heater has been

equipped with a gas-fired burner.

Setting the nominal load is always necessary

because the load may vary with the various ventilator

burners. The burners have not yet been set to the

right load by the manufacturer.

Setting the nominal load and checking the correct

gas/air ratio must be carried out in accordance with

the instruction manual for the front-mounted burner.

The burner pressures to be set for Riello front-mounted

burners are shown in table 1.3.2

2.6 Conversion to another gas type

This section is only applicable, if the heater has been

equipped with a gas-fired burner and

conversion of the burner is permissible.

If the heater has to function on a gas category (LP-gas or

natural gas) other than the gas set as standard (ex

works), the heater must be converted to the applicable

gas category by means of the conversion kit(s) to be

ordered. Only an authorised installer may convert the

heater.

2.7 Maintenance

The heater must be checked and cleaned regularly (at

least once a year) by an accredited installer, so that

correct operation is guaranteed. The bar burners, control

and safety valves, the glow igniter and anodes must also

be checked

2.8 Anode

The life of the anode is determined by the quality and

quantity of the water flowing through the heater.

Therefore, we recommend that the anode is checked

regularly - preferably simultaneously with an internal

inspection of the glass lined tank. In order to determine

the frequency with which the anodes must be replaced,

the water side of the boiler must be checked three

months after installation. The anodes must be replaced if

more than 60% has dissolved at any point on their length.

To inspect the tank:

1. Close the cold-water inlet tap;

2. Empty the heater completely by opening the drain

valve;

3. Remove the covering plates on the heater’s outer

jacket;

4. Remove the access cover plates form the tank by

unscrewing and removing the bolts and washers,

(see figure 6);

5. To ensure watertightness of the access covers the

rubber O-rings must be replaced when the access

covers are refitted, (see figure 6).

To inspect the anodes:

1. Remove the draught diverter;

2. Unscrew the fastening screws on the lid edge;

3. Remove the lid. The hexagonal heads of the anodes

are now visible, (see figure 7);

4. Unscrew the anodes with the appropriate spanner

and replace with new anodes if required. Attention:

the anodes must make contact with the tank (metal

on metal). If the tank and the anodes are separated

electrically (as a result of the sealing material used),

the anode cannot function. This could have a

negative effect on the operating life of the tank;

5. Assemble everything in reverse order;

6. Fill the heater and test.

Figure 6: Inspection hatches.

Figure 7: Anodes

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