HAMWORTHY HEATING LTD. PUREWELL PERMANENT IGNITION 500001090/B
15
out, push in the 'stop' button and
wait 3 minutes
before repeating above procedure.
If the pilot does not light after repeatedly operating
the piezo unit for several seconds, re-vent the gas
line to the outside of the building. Check whether
spark and gas are present at the pilot. (See
Section 12:FAULT FINDING
). Having established
the pilot, release the 'start' button and remove the
pilot adjustment cover screw on the gas control
valve. (See Figure No. 14 for relevant gas valve
fitted).
11.6 Gas Pressure Adjustment and Combustion
Checks
Adjust the screw so that the flame envelops the tip
by approx. 12mm. After pilot adjustment, check
time clock circuits (if fitted) are closed. Replace the
3 pin IEC plug. Adjust control thermostat to
required temperature: the gas valve should open
and main burner ignite.
After the boiler has operated for approximately 10
minutes, remove the 3 pin IEC plug. Open the
pressure test point screw on the burner manifold
and fit a manometer (suitable for 30mbar - Natural
Gas or 50mbar - Propane). Check gas pressure
reading against that shown in Figure No. 1 or
Appendix ‘A’. Adjust control valve regulator as
required by removing cap and turning with a
screwdriver. Refer to Figure No. 14 for alternative
gas valve details.
Remove manometer and close all pressure test
points, (Replace caps if fitted). Record all readings
for future reference on relevant commissioning
sheet.
Check no flue gas spillage occurs from the diverter:
Ref.
BS 5440
:Part1 will give guidance if required.
Allow system to warm up sufficiently to check
operation of control thermostat.
11.7 Temperature Limiter (Limit Thermostat)
Reset and test the operation of the temperature
limiter by firmly pressing the button (in the control
panel), removing the clip and bulb from the pocket
and carefully applying a heat source to the bulb.
The reset button should operate. If satisfactory, refit
the bulb in the pocket and secure with the clip.
Check temperature limiter setting. This can be
achieved by isolating the power supply, removing
the door and removing the control panel cover.
Remove the plastic cover (unscrewing) if fitted.
Undo holding nut and withdraw into the controls
housing. Adjust if required and replace in reverse
order to above.
A combustion check must be taken when first
commissioning the boiler. A sampling point is
provided, in the flue on
‘Classic’
models or on the
inspection door of
‘Integra’
models (fitted under
rear casing). Remove plug and insert sampling
probe. Replace plug when test is complete.
NOTE!
Care should be exercised if the boiler is
firing as the flue can achieve temperatures, which
will produce injury if touched.
Combustion figures for Natural Gas should be as
follows: -
CO
2
= 8.5 - 9% (Dry flue gas).
CO = 0-50ppm: However figure should not
exceed 200ppm under normal operating conditions.
Details of flue gas composition relating to propane
firing can be found in Appendix ‘A’.
The flame supervision device can now be checked
by pressing/twisting the stop button on the gas
control valve (Operation dependent on gas valve
type fitted.). After approximately 45 seconds the
solenoid valve should be heard to click closed.
Wait a further 3 minutes
and carry out pilot
lighting procedure.
11.8 User’s Instructions
When the above is complete, the end user or their
representative should be made aware of the lighting
and operating instructions fitted to the inside of the
boiler door. A practical demonstration should be
given describing each functional step. This
Installer's Guide and user’s instructions should then
be handed over and be kept in a safe place for
easy reference.
12.0 FAULT FINDING
12.1 Safety Features Summary
Should the control thermostat fail, the temperature
limiter will trip thus creating an immediate shutdown
regardless of firing mode. If this occurs the
temperature limiter situated in the controls housing
will require re-setting by pushing the small pin in
firmly.
Note!
Access to this pin is gained by
removing door and unscrewing safety cover (if
fitted). An investigation should be carried out to
ascertain the reason for the overheating. An
obvious reason would be too low a water flow rate
through the boiler.
NOTE!
The pilot will not remain
established if this pin is not re-set manually.
Volt free contacts are not available for connection
to BEM system. An optional Flame Failure kit is
available utilising a gas pressure switch fitted in the
pilot gas line and in the event of pilot failure this will
activate a remote lockout signal – to be configured
by a competent person.
All propane-firing boilers are fitted with a low gas
pressure switch (set at 20mbar). Should the gas
supply pressure fall below this level, the boiler
will
not
operate.
12.2 Fault Finding Procedures
General fault finding is shown in Figure Nos.15 &
15a. If the boiler still cannot be operated
satisfactorily after following the chart, consult your
local office of Hamworthy Heating for assistance.
