Lochinvar 81-286 Temp Sw, Open, Applies to the 286 Model Only, Anti-cycling, Flame Fail Ign

Page 38

Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

 

APS:

 

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally closed

 

 

terminals.

 

 

 

 

 

• Air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 3 - General Venting of the

 

 

Knight

Installation and Operation

Manual

for

 

 

proper lengths.

 

 

 

 

 

• Check for obstruction or blockage

in the

air

 

 

intake pipes or at terminations.

 

 

APS / HEX

 

• Check reference hoses connected to the air pressure

 

switch for blockage or obstruction.

 

 

Temp Sw

 

• Inspect the burner. Reference page 31 of this manual

Open

Either the air pressure switch contacts are

for removal and cleaning procedures.

Replace if

(will require a manual

necessary.

 

 

 

reset once the condition

open, or the O-temp heat exchanger switch

• Inspect the heat exchanger.

Reference page 32 of

has been corrected.

has opened.

this manual for removal and cleaning procedures.

Press the RESET button

 

 

Replace if necessary.

 

 

 

on the SMART SYSTEM

 

• Faulty air pressure switch. Replace switch.

 

display to reset.)

 

 

 

 

 

 

 

 

 

 

 

O-TEMP HEX SWITCH

 

 

 

 

 

(Applies to the 286 Model Only):

 

 

 

• Inspect the back of the inner combustion chamber at

 

 

burner level for refractory breakdown / missing.

 

 

Replace heat exchanger if refractory is broken and unit

 

 

has fired.

 

 

 

 

 

• Check continuity across two contacts. Wires should be

 

 

connected at both poles of the normally closed switch.

 

 

• Faulty O-Temp HEX Switch. Replace switch.

 

 

 

 

 

The main control board has received a call

• The control board will release the call for heat after a

Anti-cycling

for heat too quickly after the previous call for

set time period.

 

 

 

heat has ended.

• The control board will release the call for heat if the

 

 

outlet temperature drops too quickly.

 

 

 

 

 

 

 

• Inspect spark electrode and associated wiring for

 

 

damage and connection. Reference page 31 of this

Flame Fail Ign

 

manual for removal and cleaning procedures.

(will require a manual

 

Replace if necessary.

 

 

 

 

• Check for proper electrical grounding of the unit.

 

reset once the condition

The unit has failed to prove main burner

 

has been corrected.

• Check

incoming supply gas

pressure.

Natural

gas

Press the RESET button

ignition after four (4) attempts.

pressures should be between 4 - 14 inches w.c. and

on the SMART SYSTEM

 

 

LP gas pressures should be between 8 - 14 inches w.c.

display to reset.)

 

Refer to Section 7 - Gas Connections of the Knight

 

 

Boiler Installation and Operation Manual for detailed

 

 

information concerning the gas supply.

 

 

 

 

 

 

 

 

 

38

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Image 38
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Contents Models 81 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials When servicing boiler Maintenance What is in this manual?Service TroubleshootingService Near boiler pipingKnight boiler display Navigation DialControl inputs LOW Voltage Connection BoardSmart Control Module Control outputsHow the boiler operates Access modesGeneral Operation 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 DisplayMenu Description See User Access Installer Access Display ModifyParameter table DHW Settings Resetoutdoor See User Access Installer Access Display Modify DescriptionBMS Service Notification Time and Date Temperature units C / FViewable and changeable control parameters Software VersionFunctions Temperature SettingsData Logging DHW Settings Outdoor Reset Anti-Cycling Controlling Sensor Ramp SettingsControl modes BMS Thermostat InputCascade Offset Minimum On/Off TimeCirculation pumps Service Notification Instructions Maintenance Maintenance and annual startupService technician Maintenance Check expansion tank Flue vent system and air pipingCheck water system Check boiler relief valveCheck control settings Check ignition ground wiringCheck all boiler wiring Check flame signalOiled bearing circulators Cleaning boiler heat exchangerReview with owner Kit Part Component Number DescriptionCheck control module fuses TroubleshootingBefore troubleshooting Check the followingOperation No DisplayNo Burner Unit DoesResistance Temperature Checking temperature sensorsTemperature Resistance Temperature Resistance Boiler Pump System Pump NoisyNo Pump DHW PumpTroubleshooting Applies to the 286 Model Only Temp SwOpen Anti-cyclingCont’d Flame SequenceOutlet Arhl Outlet MrhlHigh Fan Low/HighFan Speed Low GV/RelayLouver Proving FaultSensor Shorted Inlet SensorMemory Error Flue Sensor FaultFatal Error Flue Temp DiffOutlet Temp Flue Temp HighDelta T High Parameters Progr Service BlkRem Ctrl Flt Combustion Analysis Procedure Or Obstruction Gas valve adjustment procedureGas Valve Adjustment Gas Supply Pressure
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81-286 specifications

Lochinvar 81-286 is a highly efficient and innovative heating solution that represents the latest advancements in boiler technology. This model, part of Lochinvar's prestigious line-up, is designed for commercial applications, delivering superior performance while emphasizing energy efficiency and user-friendly operation.

One of the standout features of the Lochinvar 81-286 is its robust construction. Built with high-quality materials, the unit is engineered for durability and reliability, ensuring long-term operation with minimal maintenance. Its compact design allows for versatility in installation, making it suitable for various building layouts and configurations.

The boiler's primary technology is its advanced condensing capability, which optimizes heat transfer and reduces energy consumption. By efficiently using the heat generated during combustion, the 81-286 can achieve higher thermal efficiencies, often surpassing traditional systems. This results in lower operating costs and reduced greenhouse gas emissions, aligning with the growing demand for sustainable energy solutions in commercial buildings.

Lochinvar incorporates intelligent control systems into the 81-286, featuring user-friendly interfaces that facilitate straightforward programming and monitoring. These control systems enable precise regulation of temperature and pressure, ensuring optimal operation while providing real-time feedback that aids in troubleshooting and maintenance. Users can enjoy the convenience of remote monitoring, enhancing the overall user experience.

Another key characteristic of the Lochinvar 81-286 is its capacity range. The model is available in various sizes, allowing it to meet the specific demands of different facilities, from small businesses to large industrial applications. This flexibility makes it a top choice for contractors and engineers seeking reliable heating solutions that cater to diverse needs.

In addition, the Lochinvar 81-286 boasts exceptional safety features, including built-in safeguards that protect against overheating and pressure surges. These aspects ensure that the unit operates within safe parameters, providing peace of mind for facility managers and operators.

In summary, the Lochinvar 81-286 combines durability, efficiency, and advanced technology, making it an ideal solution for commercial heating needs. With its innovative condensing design, intelligent controls, and safety features, this boiler stands out as a reliable choice for those seeking sustainable and effective heating solutions. Its versatility and performance make it a key player in today’s ever-evolving energy landscape.
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