A.O. Smith EQB 155 G, EQB 115 G Setting the nominal heat input, Converting to another type of gas

2.6Setting the nominal heat input

The gas control has been factory preset to the water heater nominal heat input.

A further check of the burner pressure should be carried out during the commissioning of the unit after installation. The following procedure should be followed.

1.Remove the protruding cover screw on the right side of the gas control block and connect a U-gauge manometer to the outlet.

2.Put the appliance into operation and ignite the burner.

3.Check the burner pressure and, if necessary, reset by means of the adjusting screw “pr adj” (pressure adjustment; see Figure 9). To make this possible the temperature control

knob should be removed by pulling it straight forward, making the “pr adj” visible. Turning clockwise reduces the pressure; turning anti clockwise increases the pressure. It is recommended to check the heat input by means of the gas meter.

4.Turn off the appliance and remove the manometer hose and replace the adjusting screw.

5.Replace the thermostat control knob.

6.Put the appliance into operation.

2.7Converting to another type of gas

For conversion of the appliance from natural gas to another type of gas, or vice versa, it is necessary to exchange the pilot injector and the main injector. The conversion may only be executed by a qualified competent person.