16
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 Figure 10). 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 in-
put 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.
2.7
Conversion to another
type of gas
The SGT boiler is only suitable for
use with natural gas.
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 of the anode is determined by
the quality and the quantity of water
flowing through the device. It is
recommended, therefore, to have the
anode checked and, if necessary,
replaced once a year.
Fig. 10 - Setting the nominal load
AOS 0486
