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5. Energise electrical supply and start the boiler module. Refer to the user instructions for the boiler input level.
6. Monitor the combustion readings on the combustion analyser at both Maximum and Minimum firing rates.
*Figure must not exceed 200ppm under normal operating conditions.
If combustion readings fall within the required range the boiler module is set and operating correctly. If the
combustion readings fall outside the required range the burner settings will require adjustment.
CONTACT HAMWORTHY HEATING TECHNICAL DEPARTMENT FOR FURTHER DETAILS
7. Shut down the boiler and isolate from the electrical supply. Remove instrumentation and replace test points and plugs.
8. Refer to section 8.1 - Controls Operation, to adjust the relevant boiler settings specific to the installation
8.7 User Instructions.
When the boiler is fully commissioned, the owner or their representative should be made aware of the lighting-up
and operating instructions. A practical demonstration should be given describing each functional step. This
Installation and Commissioning guide, the servicing instructions manual and the user's instructions should then be
handed over and be kept in a safe place for future reference.
9.0 FAULT FINDING
The Wessex ModuMax boiler is equipped with full self-diagnostic fault indication, with faults being allocated a
code. A lockout will be denoted by a flashing LED on the fascia panel which will also be constantly illuminated by
a block error - refer to the separate Navistem manual.
The common fault codes are detailed in the separate user instructions guide. Fault codes not detailed in this
manual should only be investigated by an Engineer.
Should a fault code appear which cannot be reset, or a fault code repeatedly occurs,
contact Hamworthy Heating for assistance. Do not continue to operate or use the boiler
as this may cause damage to the controls.
9.1 Safety Temperature Limiter (Limit Thermostat)
1. The electronic control thermostat has several safety levels built in such that a controlled shutdown should occur
before the safety temperature limiter is activated. Should these safety levels be overridden (say external pump
overrun failure after shutdown) the safety temperature limiter will trip initiating a boiler shutdown, preventing the
boiler from firing. A code on the controls display will flash indicating that the safety temperature limiter has tripped.
2. The limit thermostat (mounted on the control panel assembly - visible after removing the front cover) will
automatically reset after the boiler returns to a normal operating temperature.
3. Always carry out an investigation to ascertain the reason for overheating. The most common cause of
overheating lack of water flow rate through the boiler - possibly due to external pump problem.
9.2 Ignition Controller
1. The flame is under constant supervision by the burner ignition controller. The controller monitors the flame's
ability to rectify an AC current. If the flame diminishes for whatever reason and the rectified current drops below
the controller's minimum detection current (3µA DC), the controller will de-energise the gas control valve within 1
second and commence a restart. Failure to establish and detect a flame during the light-up sequence will result in
burner shutdown and lockout within 5 seconds, requiring a manual reset to restart the ignition sequence.
2. If the boiler continues to lockout, then an investigation must be made to ascertain the cause.
3. A false flame signal at the start and during pre-purge will cause the boiler module to restart its ignition
sequence at the end of the pre-purge period. If this occurs 3 times in succession the controls will disable
operation of the boiler module, requiring reset of the module.
27
HAMWORTHY HEATING LTD
Wessex ModuMax mk3 Boilers
500001308/C
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