HAMWORTHY HEATING LTD
17
WESSEX 100 M
500001080/F
front casing panel left hand side.
NOTE!
Care should be exercised if the boiler is
firing as the flue can achieve temperatures which
can cause injury if touched.
Combustion figures for Natural Gas should be as
follows for both High and Low firing under the
following conditions :-
With Casing Door Removed -
CO
2
= 8.0-8.5% (Dry flue gas)
O
2
= 6-7%
CO
=
0-100ppm: However figure should not
exceed 200ppm under normal operating conditions.
With Casing Door Fitted -
CO
2
= 9.0-9.5% (Dry flue gas)
O
2
= 4-5%
CO
=
0-100ppm: However figure should not
exceed 200ppm under normal operating conditions.
The above figures also apply to propane firing - See
Appendix ‘A’ (p30).
11.4.5 Air Inlet Damper
The air inlet damper is ‘Factory Set and sealed’, and
must not be adjusted.
With the casing door
removed, a CO
2
level of 9.0-9.5% should be
achieved. Slight adjustments should be made to the
burner pressure to achieve this performance at both
High and Low fire. Refer to Figure 11.2 (p18) for the
necessary adjustments.
Recheck the combustion figures and ensure that
all connections on the damper mechanism are
secure.
11.4.6 Safety Checks
To check for correct operation of the ignition
controller, break the multi-meter
µ
A circuit (terminal
R1-R2 on the main PCB), the boiler should lockout
after approximately one second. Check that the
flame has been extinguished. Remove multi-meter
and replace wire link across terminals R1-R2. If a
Sequencing Interface Module is fitted set the hand/
auto switch ‘SW2’ on the boiler main PCB to the
‘auto’ position. Replace front cover. Wait at least 15
seconds before pressing re-set button on fascia to
re-set controller. After a waiting period the boiler will
light and run normally.
11.5 External Controls
The external controls used in typical boiler
installations, for both vented and unvented systems,
are shown in Figure 1.1 (p2). If different systems or
controls are to be used and there are any doubts as
to the suitability, contact Hamworthy Heating
Technical Department for advice.
11.4.2 Procedure for Initial Lighting
Ensure gas service valve is in the "OFF" position.
Replace 2A fuse in fascia. Press lockout button on
fascia to re-set the controls, (wait at least 15
seconds before pressing again if the lockout neon is
not extinguished). The combustion fan will start and
run for a pre-purge period (approximately 30
seconds). During this time the 'fan on' neon should
illuminate. After a delay and if airflow is proved, the
HSI system will operate causing the igniter to glow
red (visible through the viewing port). As the gas
service valve is closed, the controls should go to
lockout after approximately 40 seconds (red neon
on fascia illuminated). If the above occurs correctly,
OPEN the service valve and press re-set button on
fascia.
After the pre-purge period the ignition should be
initiated and main gas valve will energise lighting the
main burner.
Note!
the multi-meter should be
reading at least 2µA.
11.4.3
Checking/Adjusting Inlet and Setting
Pressures
After the boiler has operated for approximately 10
minutes, remove the 2A control fuse on the fascia,
and connect manometers to the inlet and outlet
pressure test points
on the gas valve
. Replace the
fuse and re-light the module checking both the inlet
and setting pressures, see Figure 2.2 (p4). If
necessary adjust low fire and high fire gas
pressures. Refer to Figure 11.2 (p18) for adjustment
procedure of relevant gas valve fitted.
For Natural Gas the gas pressure governor control
system is configured for a nominal gas inlet
pressure of 20mbar measured at the inlet to the gas
valve, with a maximum inlet pressure of 25mbar.
For propane firing models, the nominal gas inlet
pressure is 37mbar with a maximum inlet pressure
of 45mbar.
Remove the 2A control fuse, disconnect the
manometers and close the pressure test points.
Record all readings for future reference on the
relevant commissioning sheet. Replace the 2A
control fuse and allow system to warm up
sufficiently to check operation of control thermostat.
NOTE:
The above is a first order check. Final
setting must be made using a gas meter.
11.4.4
Combustion Check
A combustion check must be taken when first
commissioning the boiler. To achieve the specified
combustion results, the burner pressure may need
trimming. A plugged sample hole is provided in the
Содержание Wessex 100 M100
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