Knight 100 Series, Руководство по обслуживанию

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3
Troubleshooting
44
Table 3-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Flame Sequence
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the SMART SYSTEM
display to reset.)
The flame detector circuit is seeing a flame
signal while the gas valve is off.
• Check supply voltage for proper polarity.
• Check external wiring for voltage feedback.
• Check the flame rod and make sure it is clean.
• Check the internal wiring for bad connections.
• Replace main control board.
Outlet ARHL
The outlet water temperature has exceeded
the setting of the automatic reset high limit.
• Adjust the set point of the auto reset limit to a higher
setting up to a maximum of 200°F. Reference
the Knight Fire Tube Boiler Installation and Operation
Manual for adjusting procedures.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the boiler is piped properly into the heating
system. Refer to Section 6 - Hydronic Piping of the
Knight Fire Tube Boiler Installation and Operation
Manual for the proper piping methods for the Fire Tube
boiler.
• Check 120 vac to boiler pump motor on a call for
heat. If voltage is not present, check wiring back to
the main control board.
• If 120 vac is present on a call for heat and the boiler
pump is not operating, replace the pump.
• If the system pump is a variable speed pump, ensure
that the system flow is not less than the boiler flow.
• If operating on something other than an outlet sensor,
check temperature setting of the main control board.
• Check resistance of water sensors and compare to
Table 3-2A of this manual. Replace sensor if necessary.
• Replace the main control board if necessary.
Outlet MRHL
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the SMART SYSTEM
display to reset.)
The outlet water temperature has exceeded
the setting of the manual reset high limit.
• Adjust the set point of the manual reset limit to a higher
setting up to a maximum of 210°F. Reference the Knight
Fire Tube Boiler Installation and Operation Manual for
adjusting procedures.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the boiler is piped properly into the heating
system. Refer to Section 6 - Hydronic Piping of the
Knight Fire Tube Boiler Installation and Operation
Manual for the proper piping methods for the Fire Tube
boiler.
• Check 120 vac to boiler pump motor on a call for
heat. If voltage is not present, check wiring back to
the main control board.
Service Manual