Checks Prior To Lighting The Boiler; Initial Lighting - Hamworthy F40V Installation, Commissioning And Operating Instructions

Fig 7.2.2 - Gas Inlet Pressure Test Point

7.2 Checks prior to lighting the boiler

Note: Refer to Appendix A, Gas Data Tables, for
maximum inlet pressure for normal operation.
7.2.1 The Following checks must be made prior
to lighting the boiler;
1. Open the front cover to gain access to the boiler
components. The cover is secured with a 1/4 turn
latch, requiring a flat blade screw driver to operate the
latch. Carefully lift off the cover to expose the boiler
components and installer wiring connections.
Note: Before starting the boiler commissioning
procedure verify the following;
2. Ensure that all external controls are not demanding
that the boiler commences operation.
3. Ensure that the gas supply is connected, but the
boiler module gas service valve(s) are closed, any
unions or fittings are correctly tightened and test
points are closed.
4. Check that the heating system has been flushed
and refilled and that air has been purged from all high
points.
5. Ensure that the system isolating valves are in the
open position and that the water pressure within the
heating system is correct. Minimum pressure 0.5barg.
6. Ensure that the flue ducts are correctly fitted and
that they are free from obstruction. Check that the
inlet and outlet terminal are located correctly and in
accordance with regulations.
7. Ensure that the gas supply has been properly
purged and verified for gas soundness. A purge and
soundness certificate should be available from the
gas pipe work installation contractor.
8. Turn on the mains gas supply. Check that sufficient
gas pressure is available at the boiler, 17.5mbar
Natural Gas.
10.Ensure that all electrical connections made to the
boiler are correctly sized and installed. Refer to wiring
diagram in Figure 9.3.1
11 Check that the boiler controls wiring has not been
modified. Any modification could lead to boiler failure.
HAMWORTHY HEATING LTD
7.2.2 Gas inlet pressure test
The gas pressure must be checked at the inlet to the
boiler as shown in figure 7.2.2. 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 - refer to 7.4
A maximum difference in gas pressure of 1 mbar must
not be exceeded
conditions.
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.

7.3 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 section 8.6 - Combustion Checks
7.3.1 Operational Checks
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 on/off switch located on the front panel of
the boiler to the on position - see figure 8.1.
3. Start the individual boiler module using the mode
button located on the fascia panel for the chosen
module - detailed in section 8.2.5 - Controls Operation..
4. The control thermostat is set using the button (2) on the
fascia as detailed in section 8.2.5 - Controls Operation.
5. As the gas valve is closed, the low gas pressure
switch will prevent the boiler from firing and the error
code 'E132' will be displayed on the screen. Refer to
section 8.2.4 of Controls Operation.
6. If the above procedure occurs correctly, open the gas
isolating valve and the fault indication will extinguish.
The boiler will commence its ignition sequence as
previously described. This time, when the gas valve is
energised the burner will ignite.
7. The flame ionisation signal generated whilst the
boiler is firing (should be approximately 15-20µA, but
not less than 3µA, can be viewed directly from the
display screen. The value is set to read dc μA. Refer to
section 8.2.1.2 - Controls Operation.
17
FLEET V series
between static and
500001213/G
dynamic