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2.6 Setting 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 drawing 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. Relace the thermostat control knob.
6. Put the appliance into operation.
2.7 Converting 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.
Drawing 9 - Setting the nominal load