Hamworthy Purewell VariHeat he Installation, Commisioning And Maintenance Instructions page 23

Figure 7.4.3 - Fan Assembly PV65he & PV85he
High Fire Gas / Air
Adjustment Factory
Sealed
Pressure Switch
Figure 7.4.4 - Fan Assembly PV105he & PV125he
HAMWORTHY HEATING LTD
Outlet Gas
Pressure
Test Point
Pressure Feed
Back Tube
Outlet Gas
Pressure
Test Point
PUREWELL VariHeat he
Pressure Switch
High Fire Gas / Air
Adjustment Factory
Sealed
Low Fire Gas Adjustment
Factory Sealed
18
Low Fire Gas Adjustment
Factory Sealed
500001155/F