Fault Fi Nding - andrews MAXXflo EVO Series Installation And Maintenance Manual

5.6 FAULT FINDING
5.6.1 OPERATION SEQUENCE
To operate this heater you must have suffi cient gas volume and be of the correct gas type. Electricity supply,
220-240v 50Hz and a valid demand from the DHW system.
1. The circulation pump is turned on.
2. The gas control starts the Ignition sequence following a demand for DHW.
3. The Fan operates on the heat engine as a pre-purge of the heat engine airways.
4. After 15 seconds of fan operation, a spark is created at the electrode and the gas valve is opened.
5. The ignition spark and gas valve opening will last for a maximum of 10 seconds.
6. A 3 second period of fl ame stabilisation will occur immediately after a successful ignition.
7. At the end of the stabilisation period the controls will check that a fl ame is present. If no fl ame is
detected, stages 1 - 5 will be repeated 4 further times (within 24 hours) before a permanent lockout
of that heat engine occurs.
8. On successful confi rmation of a fl ame, the fan speed is then increased by the controls to suit the
demand conditions.
9. The heat engine will continue to operate until DHW demand has been met, the control timer has
turned off the demand or the controls detect a fault condition.
5.6.2 FAULTS AND LOCKOUTS
If the heat engine is unable to ignite or detects a safety condition, the controls of the heat engine will lockout
and will be prevented from fi ring again, without manual intervention. The display will show the
along the top bar of the GUI display to indicate that there is a fault.
The fault will have to be cleared before that heat engine will function again. Selecting from the info pages
menu will provide the fault detail (see section 6.5 at the end of this manual for the possible error codes).
Press the RESET button on the front of the heater and provided the condition has been corrected the heat
engine will run through the ignition sequence again and the
a short delay.
5.6.2.1 FAULT DISPLAY EXAMPLES
The display will show a
the info pages menu . See example screen:
Info pages
A Lockout condition should not be repeatedly reset. If the condition persists then a
qualifi ed repair engineer should be called.
Commissioning
if the heater has recorded a fault. More information can be obtained by selecting
symbol will disappear from the display after
47
symbol
F Fault symbol
MAXXfl o EVO