Combustion Checks; Gas Pressure Switch Location; Gas Pressure Switch - Wiring Schematic; Gas Pressure Switch Adjustment - Hamworthy Purewell Installation, Commisioning And Maintenance Instructions

11.5.2 Combustion Checks

A flue gas sampling point is provided in the front boiler
casing (see Figure No. 7). To check combustion take
a flue gas sample from each module test point and
for reference CO measurements should be between
2
8.0% and 11.5% or 9.0 to 4.0% O
model). Normal CO levels should not exceed 200ppm.
NOTE: All the above measurements refer to dry flue
gas samples.

Gas Pressure Switch Location

Key: I - Gas Pressure Switch
II - Main Gas Valves
HAMWORTHY HEATING LTD.
(dependant upon
2
33
PUREWELL AUTOMATIC IGNITION

Gas Pressure Switch - Wiring Schematic

Gas Pressure Switch Adjustment

With the cover removed, turn the M3 nut clockwise to
increase the set point and vice-versa. Seal the
adjuster after setting.
15.0 RECOMMENDED SPARES
MECHANICAL ITEMS
Low Gas Pressure Switch................... 339009477
PART No.
500001035/G