Outlet Arhl, Outlet Mrhl | Lochinvar 81-286 manual

Lochinvar 81-286 service manual Outlet Arhl, Outlet Mrhl

Page 40

Service Manual

3 Troubleshooting (continued)

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT	DESCRIPTION		CORRECTIVE ACTION

		• Adjust the set point of the auto reset limit to a higher
		setting up to a maximum of 200°F. Reference the
		Knight 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	Boiler	Installation	and	Operation	Manual
		for the proper piping methods for the Knight boiler.
		• Check 120 vac to boiler pump motor on a call for
		heat. If voltage is not present, check wiring back to
	The outlet water temperature has exceeded	the main control board.
Outlet ARHL	The outlet water temperature has exceeded	• Replace the main control board if necessary.
Outlet ARHL	the setting of the automatic reset high limit.	• If 120 vac is present on a call for heat and the boiler
		• 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.
		• If the optional manual reset high limit has tripped,
		check setting of the device.
		• Check resistance of water sensors and compare to
		Table 3-2A on page 35 of this manual. Replace
		sensor if necessary.
		• Replace high limit.

		• Adjust the set point of the manual reset limit to a higher
		setting up to a maximum of 210°F. Reference the
Outlet MRHL		Knight Boiler Installation and Operation Manual for
Outlet MRHL		adjusting procedures.
(will require a manual		• Verify that the system is full of water and that all air
reset once the condition	The outlet water temperature has exceeded	has been properly purged from the system.
has been corrected.	The outlet water temperature has exceeded	• Verify that the boiler is piped properly into the heating
Press the RESET	the setting of the manual reset high limit.	system.	Refer to Section 6 - Hydronic Piping of the
button on the SMART		system.	Refer to Section 6 - Hydronic Piping of the
SYSTEM display to		Knight	Boiler	Installation	and	Operation	Manual
SYSTEM display to		for the proper piping methods for the Knight boiler.
reset.)		for the proper piping methods for the Knight boiler.
reset.)
		• 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.

Image 40

Contents

Models 81 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler What is in this manual? ServiceMaintenance TroubleshootingService Near boiler pipingKnight boiler display Navigation DialControl inputs LOW Voltage Connection BoardSmart Control Module Control outputsAccess modes General OperationHow the boiler operates How the control module operatesOperation Display From previous page Sequence of Operation Display panel menu access Button Screen Operation Display StatusDisplay panel parameter access Button Screen Status Operation DisplayParameter table Description See User Access Installer Access Display ModifyMenu DHW Settings Resetoutdoor See User Access Installer Access Display Modify DescriptionBMS Service Notification Temperature units C / F Viewable and changeable control parametersTime and Date Software VersionData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Ramp Settings Control modesControlling Sensor BMS Thermostat InputCascade Offset Minimum On/Off TimeCirculation pumps Service Notification Service technician Maintenance Maintenance and annual startupInstructions Maintenance Flue vent system and air piping Check water systemCheck expansion tank Check boiler relief valveCheck ignition ground wiring Check all boiler wiringCheck control settings Check flame signalCleaning boiler heat exchanger Review with ownerOiled bearing circulators Kit Part Component Number DescriptionTroubleshooting Before troubleshootingCheck control module fuses Check the followingNo Display No BurnerOperation Unit DoesTemperature Resistance Temperature Resistance Checking temperature sensorsResistance Temperature Noisy No PumpBoiler Pump System Pump DHW PumpTroubleshooting Temp Sw OpenApplies to the 286 Model Only Anti-cyclingCont’d Flame SequenceOutlet Arhl Outlet MrhlFan Low/High Fan Speed LowHigh GV/RelayFault Sensor ShortedLouver Proving Inlet SensorFlue Sensor Fault Fatal ErrorMemory Error Flue Temp DiffDelta T High Flue Temp HighOutlet Temp Rem Ctrl Flt Service BlkParameters Progr Combustion Analysis Procedure Gas valve adjustment procedure Gas Valve AdjustmentOr Obstruction Gas Supply Pressure

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Lochinvar 81-286 service manual Outlet Arhl, Outlet Mrhl

3 Troubleshooting (continued)

FAULT

Outlet ARHL

Outlet MRHL