Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 41 / 46

Page 41 (A1)
Addendum to existing manual.
REGULATION OF THE GAS PRESSURE TO THE NOZZLES
The Thermomatic boilers are delivered already prepared for the required gas, with the gas supply pressures
showed by the specific label slicked inside the front door panel, and also by the scheme of technical data in the
installation instructions (see page 1).
l)First of all check that the available gas and the supply pressure correspond to those for which the boiler has
been prepared.
Should it be necessary to do some adjustment (for example if the supply pressure is another than the
mentioned one (see the specific label), precede as follows:
2)Connect a suitable pressure gauge to the burner pressure test point on the gas control valve (n° 6 in the gas
control valve drawing).
3)Remove the screw cap that covers the gas pressure regulatory screw (6). With the help of an octagonal
screwdriver, turn the regulatory screw (6) until the same burner pressure as shown by the scheme of technical
data (page 1) is achieved:
-turn to the right to decrease the gas pressure;
-turn to the left to increase the gas pressure.