Hamworthy Wessex 100 M100 Installation, Commissioning And Servicing Instructions page 34

Figure 14.10 Gas Pressure Switch Adjustment
NYLOCK NUT M3
EYELET
HAMWORTHY HEATING LTD
SCREW M4x6 POZI PAN
WESSEX 100 M
Gas pressure switch setting:
Natural gas = 14mbar
Propane = 25mbar
Operational check of gas pressure switch.
1) Connect manometer to pressure tapping.
2) Close the gas service valve to lock up mains
pressure. Reduce pressure by loosening inlet
test point or the gas control valve until the
desired pressure is achieved.
3) Determine operation of switch using a suitable
multi-meter.
28
500001080/F