17
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 commis
-
sioning 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 incre
-
ases 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.
Figure 9 - Setting the nominal load
AOS 0486
