HAMWORTHY HEATING LTD
MILBORNE 500 SERIES
500001130/A
30
15.2 Gas inlet pressure test
The gas pressure must be checked at the inlet to
the boiler as shown in figure 24. This is to ensure
that the gas pressure is both constant and sufficient
to provide full burner output. To verify this the
pressure has to be taken as a static and a dynamic
reading. The dynamic reading cannot be taken until
the boiler has been started at step 15.3.3
A maximum difference in gas pressure of 1 mbar
must not be exceeded between static and dynamic
conditions.
The gas pressure measured during these tests must
be no less than 17.5 mbar for Natural Gas or 37.5
mbar for LPG.
15.3.2
LPG BOILERS ONLY.
Turn the flow
adjustment screw 2 full turns anti-clockwise as
indicated in figure 15.3.2
Fig 15.2 - Gas Inlet Pressure Test Point
15.3 Commissioning the Boiler
Once the preliminary checks have been completed
and the gas inlet pressure has been verified as
correct, commissioning of the boiler modules may
begin.
15.3.1 Insert the combustion analyser probe in the
flue at the analysis point shown in figure 15.3.1
Fig 15.3.1 - Analysis Point
Fig 15.3.2 - LPG Flow Adjustment
Starting the boiler
Ensure that all external time clock and thermostatic
controls are now demanding boiler operation and
that the circulating pumps are operating and
circulating water through the boiler.
15.3.3 Switch the main boiler on/off switch located
on the underside of the boiler to the on position as
indicated in figure 15.3.3
Fig 15.3.3 - Starting the Boiler
15.3.4 Start the individual boiler module using the
on/off switch located on the front of the control panel
for the chosen module. Milborne 502 models have 2
switches on the front of the control panel. It is
therefore important to selct the switch corresponding
to the boiler module being commissioned. See fig
15.3.4
