Figure 7.2.2 Gas Inlet Pressure Test Point; Figure 7.3.1 Flue Gas Analysis Point; Figure 7.3.2 Throttle Adjustment; Figure 7.4.3 Starting The Boiler - Hamworthy MILBORNE381 Series Design Installation, Commissioning And Operating Instructions

7.3 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.
1. Insert the combustion analyser probe in the flue at
the analysis point shown in figure 7.3.1
2. LPG BOILERS ONLY. Turn the throttle adjustment
screw 2 full turns anti-clockwise as indicated in figure
7.3.2
Fig 7.3.1 - Flue gas analysis point
7.4 Initial Lighting
Only competent persons registered for working on non-
domestic gas appliances should attempt the following
operations. Before attempting to commission any boiler,
ensure that personnel involved are aware of what action
is about to be taken.
Record all readings for future reference on relevant
commissioning sheet.
Allow system to warm up sufficiently to check operation of
control thermostat.
A combustion check must be taken when first
commissioning the boiler. A sampling point is provided in
the boiler - refer to fig 7.3.1.
NOTE! Care should be exercised when the boiler is firing
as the heat exchanger components can achieve
temperatures, which could cause injury if touched.
1. Ensure that all external controls are in demand and that the gas supply to the module is isolated.
2. Switch the main boiler on/off switch located on the underside of the boiler to the on position as indicated in
figure 7.4.3.
3. Start the individual boiler module using the on/off switch located on the front of the control panel for the
chosen module. Milborne 382 / 502 models have 2 switches on the front of the control panel. It is therefore
important to select the switch corresponding to the boiler module being commissioned. See fig 7.4.4
4. Ensure that a number appears in the left indication window of the Master control panel. This number relates to
one of the heating circuits.
5. As the gas is isolated, the boiler will make 5 ignition attempts and then go to ignition lockout displaying error
code 'A01'.
6. If the above procedure occurs correctly, open the gas isolation valve, press the reset button (S1) and the fault
indication will extinguish. The boiler will commence the ignition sequence and the burner will light.
7. With the boiler firing, the flame signal displayed should be approximately 40μA but not less than 10μA.
HAMWORTHY HEATING LTD
Fig 7.2.2 - Gas Inlet Pressure Test Point
Fig 7.3.2 - Throttle Adjustment
Fig 7.4.3 - Starting the Boiler
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MILBORNE 500001130/J