Lennox International Inc Gas-Fired Hot Water Boiler Troubleshooting, Initial Service Checks

Page 47

TROUBLESHOOTING

!WARNING

Fire, explosion or shock hazard. Do not attempt to modify the physical or electrical characteristics of this boiler in any way. Failure to comply could result in death or serious injury.

Important

1.In reset from lockout condition, all electrical meter readings at the gas control valve (24 vac) must be taken within trial for ignition period.

2.If any component does not function properly, make sure it is correctly installed and wired before replacing it.

3.Static electricity discharge can damage integrated boiler control (IBC). Touch metal surface to discharge static electricity before touching IBC.

4.IBC cannot be repaired. If it malfunctions it must be replaced.

5.Only trained service technicians should service IBC systems. Following troubleshooting, check out system following sequence of operation for a normal light off sequence.

6.All controls are factory tested in the assembly process and a defective control is generally the least likely cause. If you suspect you have a defective control, read through this section before you replace it.

7.It is extremely unlikely that the two consecutive controls are defective. If it seems to be happening, chances are that either there is nothing wrong with the control or it is being damaged by some other problem (an electrical short burning out a transformer, for example).

Initial Service Checks

1.Before troubleshooting:

A.Make sure that circuit breaker is on or fuse is ok at electrical panel.

B.Make sure that service switch is on.

C.Make sure that gas is on at the gas meter, at all appropriate manual shutoff valves and at the gas control valve.

D.Make sure that the thermostat is calling for heat.

E.Check that wire connectors at the integrated boiler control and at the originating control are securely plugged in or connected.

F.Check that hoses are securely connected and are not plugged or damaged.

2.Troubleshooting tools:

A.Voltmeter to check 120 vac and 24 vac

B.Continuity tester.

C.Inclined manometer or pressure gauge with

0-3.0” Range (0.01” Scale) for measuring suction pressures at pressure switch.

D.U-tube manometer or differential pressure gauge with 0-14” range (0.1” Scale) for measuring inlet and manifold gas pressures.

3.IBC Error Codes.

A.IBC uses advanced diagnostic capability to assist in troubleshooting error conditions. Table 10, Page 48 shows error codes that may arise during fault condition.

B.State Conditions shown in Table 9, Page 40 provide suggestions for servicing these potential errors.

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Contents Installation Instructions Boiler Dimensions Introduction IntroductionGeneral Important Safety InformationNet Ahri Rating Shipping Flue Diameter SEA Level Ratings Natural and Propane Gases90 50/75/100 Series 2 Natural GAS Boilers for USE AT High Altitude United States Installations43331093 43331096 90 50/75 Series 2 Propane GASBoiler Location Considerations Before Installing the BoilerBoiler Sizing Extreme cold climate areas, use ¾ Armaflex or equivalent Boiler InstallationLocating The Boiler Combustion Air And Vent Pipe RequirementsFoundation Requirements Install boiler on level surfaceBoiler is not to be installed on carpeting Condensate Drain RequirementsSupply And Return Lines Clean the System FirstNear Boiler Piping Single Zone Boiler Piping Two Zone Boiler Piping With Zone Valves Multi-Zone SystemsTwo Zone Boiler Piping With Circulators Page Page Page Terminate pipe with plain end not threaded Safety Relief ValveExpansion Tank And Make-Up Water Diaphragm Type Expansion Tank Piping Conventional Closed Type Expansion Tank Piping Chilled Water Piping Reinstall vent drain lineCondensate Drain Piping Filling Condensate Trap With WaterElbow @ 3 ft. + 1 elbow @ 3 ft. = 6 equivalent ft. of pipe Combustion AIR and Vent PipeConnections And Termination ExampleBoiler Size InstallationRoof Vent / Intake Terminations Vent AIR IntakeLess Than 12 Clearance CombustionVent Air Concentric Vent TerminationsFeet minimum total equivalent length for all models Combustion Air and Vent Piping Boiler ConnectionsLeak Check Gas Piping Connecting The Gas PipingGAS Supply Piping Check Gas Supply365,000 Gas Pipe Sizes625,000 445,000Connect Circulator Pump Wiring Electrical WiringElectric Power Supply Thermostat InstallationWiring Schematic Ladder Wiring Diagram Page Ladder Diagram for Figure Controls and Accessories Circulator Pump Casting Temperature Safety SwitchDrain Valve Draft InducerStart UP To Turn Off Gas To Appliance Operating InstructionsDisplay S9381A Integrated Boiler Control Operation and AdjustmentsUser Parameters Adjusting Settings State Code Definitions Sequence of Operation Check OUT Procedure and Adjustment Review All Instructions Set Thermostat To Desired Room TemperatureVR8205 Maintenance and Cleaning Remove draft inducer and gasket from top of flue connector Annual Examination And Cleaning Of Boiler ComponentsIgniter wires Gas valve wires Initial Service Checks TroubleshootingError Codes Boiler Differential Pressure Differential AIR Pressure Switch CheckAluminum Series Eliminate System Leaks Clean System FirstFill Water and Chemistry General Guidelines When Using Antifreeze Antifreeze Products Boiler Model Serial # Date Installed Measured BTU/HR input Installation and CHECK-OUT CertificatePage Lennox Industries Inc. Dallas, Texas
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GWB9-050IH-2, GWB9-100IH-2, GWB9-075IH-2, Gas-Fired Hot Water Boiler specifications

Lennox International Inc. is a prominent player in the HVAC industry, renowned for its innovative solutions and high-efficiency products. Among its standout offerings is the GWB8 Gas-Fired Hot Water Boiler, available in various models including GWB8-262E-2, GWB8-245E-2, GWB8-280E-2, and GWB8-299E-2. These units are designed to provide reliable and efficient heating solutions for residential applications.

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