Lochinvar SNR150-100, SNA500-125, SNR200-100, SNA285-125 No Flame, Running, GV/Relay, Fail

Page 63

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

 

 

 

 

 

 

 

 

 

 

 

• Inspect spark electrode and associated wiring for

 

 

 

 

 

damage and connection. Reference page 56 of this

 

 

 

 

 

manual for removal and cleaning procedures.

 

 

 

 

 

Replace if necessary.

 

 

 

 

 

• Check for proper electrical grounding of unit.

 

 

 

 

 

• Check incoming supply gas pressure. Natural gas

 

 

 

 

 

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

 

 

 

 

 

LP gas pressures should be between 8 - 14

 

 

 

 

 

inches w.c. Refer to Section 7 - Gas Connections for

 

 

 

 

 

detailed information concerning the gas supply.

 

 

 

 

 

• Verify that the plastic hose from the gas valve to the air

 

 

 

 

 

inlet is connected and is not damaged.

 

 

 

 

 

• Verify that the vent/air intake pipes are installed

 

 

 

 

 

correctly and there are no obstructions.

 

 

 

 

 

• Check for 24 VAC to the gas valve at the 2-pin

No Flame

 

 

 

 

connection on the side of the main control board

 

 

 

 

during the ignition attempt. If no voltage is present,

Running

 

 

 

 

replace the main control board.

(will require a manual

The unit

was

running

and lost the flame

• If 24 VAC is present at the main control board, check

reset once the

condition has been

signal.

This

condition

occurred four (4)

the wiring between the main control board and the gas

valve. Replace the wiring if necessary. Do not

corrected. Press the

straight times.

 

 

 

 

disconnect the wiring from the gas valve and attempt

RESET button on the

 

 

 

 

 

 

 

 

to measure voltage at that point. The main control

display to reset.)

 

 

 

 

 

 

 

 

board can detect if the gas valve is not connected and

 

 

 

 

 

 

 

 

 

 

will display the GV / Relay Fail fault.

 

 

 

 

 

• If 24 VAC is present, check the outlet of the valve to

 

 

 

 

 

ensure the valve is flowing gas. With a manometer

 

 

 

 

 

connected to the outlet tap of the gas valve, when the

 

 

 

 

 

unit is in the prepurge period, there should be a

 

 

 

 

 

negative pressure present. When the valve is

 

 

 

 

 

energized a change in pressure should occur. If the

 

 

 

 

 

pressure change does not occur, the gas valve is not

 

 

 

 

 

opening. Replace the gas valve.

 

 

 

 

 

• Inspect flame sensor and associated wiring.

 

 

 

 

 

Reference page 56 of this manual for removal and

 

 

 

 

 

cleaning procedures. Replace if necessary.

 

 

 

 

 

• Inspect the burner. Reference page 56 of this manual

 

 

 

 

 

for removal and cleaning procedures. Replace if

 

 

 

 

 

necessary.

 

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

GV/Relay

 

 

 

 

• Ensure gas valve switch is ON (Models SNR150-100

 

 

 

 

and SNA285-125).

Fail

 

 

 

 

 

 

 

 

 

 

 

 

(will require a manual

 

 

 

 

• Check wiring harness connection at the gas valve and

reset once the

The main control board did not detect the

at the main control board.

condition has been

gas valve.

 

 

• Replace the gas valve wire harness.

corrected. Press the

 

 

 

 

 

 

 

 

 

 

 

 

RESET button on the

 

 

 

 

• Replace the gas valve.

display to reset.)

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

63

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 62 Page 64
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Page 62 Page 64
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 RatingsBefore locating the water heater, check Installation must comply withCloset and alcove installations Determine water heater location1Closet Installation Minimum Required Clearances Flooring and foundation Remove water heater from wood palletPrevent combustion air contamination 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 ventingVenting and combustion air CanadaVent pipe and fittings Air inlet pipe materials Air intake/vent connectionsVent Length Removing from existing ventVent and air piping Vent Size If using the alternate sidewall terminationSidewall direct venting Vent/air termination sidewall2Clearance to Gravity Air Inlets Prepare wall penetrations Prepare wall penetrations Alternate Field Supplied OptionTermination and fittings 5AMultiple Vent Terminations must also comply with -1A Multiple vent/air terminationsSidewall termination installation Sidewall termination optional concentric ventDescription and usage 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 ventingGeneral piping information System pipingSystem water piping methods ScaldingPiping components Water chemistryDelta T Single Unit 3Multiple Units Water Tank Supply Gas connections Connecting gas supply pipingPropane gas Natural gasNatural Gas Pipe Capacity Chart Check inlet gas supplyLength of Pipe in Straight Feet for 1/2 PSI Gas pressure Gas valve replacementField wiring 3Low Voltage Field Wiring Connections Inputs Condensate drain Condensate disposalStart-up Check for gas leaks Inspect/fill condensate systemFinal checks before starting the water heater Check flame and combustion Start the water heaterIf water heater does not start correctly Check system and water heater2Operating Instructions Models SNR150-100 -- SNA285-125 3Operating Instructions Models SNA400-125 -- SNA500-125 General Temperature controlProtection features Operating informationWater heater temperature regulation Adjustable control parametersSaving parameters HTR Ignition Sequence of operation1Control Panel Shield control moduleStatus Display Screens Status display screensStatus Display Screens cont’d Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Check water heater relief valve Flue vent system and air pipingCheck water system Check expansion tankCheck flame signal Check ignition ground wiring Check burner flameCheck all water heater wiring Check control settingsNiosh stated First Aid Cleaning heat exchangerHandling ceramic fiber materials Oiled bearing circulatorsCheck the following TroubleshootingBefore troubleshooting Check control module fusesAbove 50% No DisplayNo Burner Operation Unit Does Not ModulateTemperature F Resistance Ω Checking temperature sensorsTroubleshooting Flame SequenceNo Flame Ign Fail No FlameRunning GV/RelayFan Speed Low Manual ResetHigh Limit Fan LowSensor Open SwitchFan High Fan Speed HighProgr ParametersWrite EEProm Service BlkWatch Dog Error Low 24 VACGas Supply Pressure Combustion Analysis ProcedureGas Valve Adjustment Or ObstructionModel SNA500-125 Gas valve adjustment procedureModels SNR150-100 -- SNA285-125 Model SNA400-125120 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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