Lochinvar SNA500-125 Fan High, Fan Speed High, Sensor Open, Sensor Shorted, External Limit

Page 65

TM

Installation & Service Manual

13 Troubleshooting (continued)

Table 13E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

The actual fan RPM is 30% higher than

• Vent/air intake lengths exceed the maximum allowed

 

what is being called for.

lengths. Refer to Section 2 - General Venting for

Fan High

 

proper lengths.

 

 

 

 

 

OR

 

• Check for obstruction or blockage in the vent/air

Fan Speed High

 

intake pipes or at terminations.

 

 

 

 

 

(will require a manual

 

• Check the wiring connections at the fan and at the

reset once the condition

 

 

main control board.

has been corrected. Press

 

 

 

 

 

 

the RESET button on the

 

• Replace the fan.

display to reset.)

 

• Replace the main control board.

 

 

 

 

 

Sensor Open

Either the heat exchanger inlet water, heat

• Check the sensors and their associated wiring.

(will require a manual

exchanger outlet water or tank temperature

Repair or replace the sensor or wiring if damaged.

reset once the condition

sensor has been disconnected.

• Measure the resistance of the sensors and compare

has been corrected. Press

 

S1 = Outlet Sensor

the resistance to the tables on page 60 of this

the RESET button on the

manual.

display to reset.)

S2 = Inlet Sensor

 

 

 

 

 

 

• Replace the sensor if necessary.

 

 

 

Sensor Shorted

Either the heat exchanger inlet water heat

• Check the sensors and their associated wiring.

(will require a manual

exchanger outlet water or tank temperature

Repair or replace the sensor or wiring if damaged.

sensor has been shorted.

 

 

 

 

reset once the condition

• Measure the resistance of the sensors and compare

 

has been corrected. Press

S1 = Outlet Sensor

the resistance to the tables on page 60 of this

the RESET button on the

S2 = Inlet Sensor

manual.

display to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

External Limit

An optional remote limit switch is not

• Check function of remote devices.

Switch

making.

• Check for loose or misplaced jumper if external

(will retry after 5

 

 

limit switch is not installed.

minutes. RESET may be

 

 

 

 

 

 

pressed after condition is

 

 

 

 

 

corrected.)

 

 

 

 

 

 

 

 

 

The flue temperature has exceeded the set

• Inspect the heat exchanger. Reference page 57 of

 

parameters for the water heater.

this manual for the procedure on how to clean the

 

 

flue side of the heat exchanger.

 

 

• Inspect the flue sensor and associated wiring.

 

 

Measure the resistance of the flue sensor and

Temp O/Shoot

 

compare to Table 13C on page 60 of this manual.

 

Replace the sensor if necessary.

 

 

 

 

• Verify that the vent/air intake pipes are properly

 

 

installed and that there are no obstructions.

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

65

 

 

 

 

 

 

 

 

 

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Contents What to do if YOU Smell GAS Installation & Service ManualContents Hazard definitions Please read before proceedingBlower Shield How it worksModels SNR150-100 -- SNA285-125 Model SNA500-125 Model SNA400-125CSA RatingsCloset and alcove installations Installation must comply withDetermine water heater location Before locating the water heater, check1Closet Installation Minimum Required Clearances Prevent combustion air contamination Flooring and foundationRemove water heater from wood pallet Do not install the Shield water heater into 3Combustion Air Direct from Outside Minimum Recommended Combustion AIR Supply to Equipment Room Direct venting options General ventingVent pipe and fittings Venting and combustion airCanada Air inlet pipe materials Air intake/vent connectionsVent and air piping Vent LengthRemoving from existing vent Sidewall direct venting If using the alternate sidewall terminationVent/air termination sidewall Vent Size2Clearance to Gravity Air Inlets Termination and fittings Prepare wall penetrationsPrepare wall penetrations Alternate Field Supplied Option 5AMultiple Vent Terminations must also comply with -1A Multiple vent/air terminationsDescription and usage Sidewall termination installationSidewall termination optional concentric vent 9Concentric Vent Dimensional Drawing Multiventing sidewall terminations 12Concentric Vent Sidewall AttachmentVent/air termination vertical Vertical direct venting2Vertical Terminations with Multiple Water Heaters Prepare roof penetrationsVertical termination optional concentric vent Vertical termination installationMultiventing vertical terminations 6Concentric Vent Roof Installation1Vertical Direct Venting w/Room Air Conventional and sidewall ventingSystem water piping methods System pipingScalding General piping informationDelta T Piping componentsWater chemistry Single Unit 3Multiple Units Water Tank Supply Gas connections Connecting gas supply pipingPropane gas Natural gasLength of Pipe in Straight Feet for 1/2 PSI Natural Gas Pipe Capacity ChartCheck inlet gas supply Gas pressure Gas valve replacementField wiring 3Low Voltage Field Wiring Connections Inputs Condensate drain Condensate disposalFinal checks before starting the water heater Start-upCheck for gas leaks Inspect/fill condensate system If water heater does not start correctly Start the water heaterCheck system and water heater Check flame and combustion2Operating Instructions Models SNR150-100 -- SNA285-125 3Operating Instructions Models SNA400-125 -- SNA500-125 Protection features Temperature controlOperating information GeneralSaving parameters Water heater temperature regulationAdjustable control parameters HTR Ignition Sequence of operation1Control Panel Shield control moduleStatus Display Screens Status display screensStatus Display Screens cont’d Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check water heater relief valveCheck all water heater wiring Check ignition ground wiring Check burner flameCheck control settings Check flame signalHandling ceramic fiber materials Cleaning heat exchangerOiled bearing circulators Niosh stated First AidBefore troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner Operation No DisplayUnit Does Not Modulate Above 50%Temperature F Resistance Ω Checking temperature sensorsTroubleshooting No Flame Ign FlameSequence Running No FlameGV/Relay FailHigh Limit Manual ResetFan Low Fan Speed LowFan High SwitchFan Speed High Sensor OpenProgr ParametersWatch Dog Error Service BlkLow 24 VAC Write EEPromGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureModels SNR150-100 -- SNA285-125 Gas valve adjustment procedureModel SNA400-125 Model SNA500-125120 VAC DiagramsLOW Voltage

SNA400-125, SNR150-100, SNA285-125, SNR200-100, SNA500-125 specifications

Lochinvar has established itself as a leader in the realm of high-efficiency heating solutions, and its line of condensing boilers, including the SNA500-125, SNR200-100, SNA400-125, SNA285-125, and SNR150-100, exemplifies the brand’s commitment to innovation, efficiency, and reliability.

The SNA500-125 model stands out with its impressive heating capacity, designed for larger commercial applications. Featuring advanced modulating burners, it can precisely adjust its output based on real-time demand, significantly enhancing energy efficiency. The stainless steel heat exchanger ensures robust durability and improved thermal performance, while the integrated controls offer advanced diagnostic capabilities and user-friendly operation.

Next in the lineup, the SNR200-100 serves as a versatile option for mid-sized applications. Its compact design allows for flexible installation, making it a valuable choice for facilities with limited space. The boiler incorporates a high-efficiency combustion system that maximizes fuel utilization, while its low NOx emissions technology aligns with environmental standards, reducing the carbon footprint of users.

The SNA400-125 delivers a robust solution for diverse heating needs, equipped with state-of-the-art modulation technology that not only optimizes efficiency but also offers quiet operation – a crucial feature for facilities where noise reduction is paramount. This model also includes built-in redundancy options, enhancing reliability during peak operational periods.

The SNA285-125 provides a balance of performance and efficiency for smaller commercial settings. Its innovative control system offers precise temperature management and easy integration with existing systems. Energy Star certified, this model is not only cost-effective but supports sustainability efforts in various industries.

Lastly, the SNR150-100 is ideally suited for light commercial applications, featuring a compact footprint and excellent heat transfer capabilities. The user-friendly interface and robust safety features make it an excellent choice for operators prioritizing both ease of use and reliability.

All these models incorporate Lochinvar's commitment to superior design and advanced technologies, setting a benchmark in the high-efficiency heating market. With a focus on long-term performance and compliance with modern environmental standards, Lochinvar continues to deliver top-tier solutions tailored to meet diverse customer needs. Whether for large-scale operations or smaller settings, these boilers represent a significant advancement in commercial heating technology.
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