Hamworthy Warmwell 60 Installation, Commissioning And Servicing Instructions page 35

Figure 11.7a Diagram of Automatic Gas Valves
ADJUSTMENT PROCEDURE.
Refer to Figure 2.2 to find the low fire/start and high
fire gas pressures for the boiler being fired.
Fit a manometer (suitable for 30mbar) onto manifold
test point.
Light the boiler, then remove the protective cover
from the Hi/Lo pressure regulator.
To adjust the high fire gas pressure, turn the outer
nut on the hi/lo pressure regulator.
To adjust low fire/start gas pressure, remove the link
between terminals C3 and C4 (CN16); nominally set
the low fire/start gas pressure by rotating the inner
HAMWORTHY HEATING LTD
cross-head screw, whilst keeping the outer nut from
rotating. Turn the boiler off then on again and fine
trim the pressure.
Insert or make high fire link on terminals C3 and C4
(CN16); the boiler should now drive to high fire.
Replace protective cap on Hi/Lo gas valve.
Note! The low fire setting must always be set
last of all. The valves operation may be incorrect
if this omitted.
Note! It is also advisable to carry out this procedure
with all the boilers firing. The long-term reliability of
the ignition system may well be reduced unless this
procedure is carried out correctly.
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WARMWELL 500001091/F