Lennox International Inc GWB9-100IH-2, GWB9-075IH-2 Differential AIR Pressure Switch Check

Page 49

DIFFERENTIAL AIR PRESSURE SWITCH CHECK

•Following steps and diagram indicate locations of connection points required to check differential air pressure.

•Differential air pressure switch is safety device which prevents boiler from firing if there is air intake, boiler heat exchanger or vent blockage.

•Turn off service switch, or lower thermostat setting.

•Remove vinyl caps from Tee and 4-way connector.

•Install testing lines as shown to inclined manometer or differential pressure gauge with ability to read 0.01” to 3.0” w.c.

•Turn on service switch and set thermostat to call for heat.

BOILER

DIFFERENTIAL

PRESSURE

SWITCH

STATUS

PRESSURE (W.C.)

CONNECTS

 

 

 

 

 

Not Running

0”

Normally Open

 

 

 

 

1.00” for Model-100

 

Setpoint

1.60” for Model-75

 

 

2.10” for Model-50

 

Running

Greater Than

 

Without

Closed

Setpoints

Blockage

 

 

 

Running

Less Than or Equal to

 

With

Open

Setpoints

Blockage

 

 

 

If manometer readings do not correspond to chart above, check for possible causes:

•- Blockage or moisture in suction lines

•- Blockage in air intake or vent pipes

•- Undersized air intake or vent pipes

•- Loose blower wheel or motor shaft

•- Incorrect pressure switch or pressure switch setpoint

When pressure reading is proper and the pressure switch is operating properly, remove testing lines and reinstall vinyl caps to Tee and 4-way connector.

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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 Sizing Before Installing the BoilerBoiler Location Considerations Locating The Boiler Boiler InstallationCombustion Air And Vent Pipe Requirements Extreme cold climate areas, use ¾ Armaflex or equivalentBoiler is not to be installed on carpeting Install boiler on level surfaceCondensate Drain Requirements Foundation RequirementsNear Boiler Piping Clean the System FirstSupply And Return Lines Single Zone Boiler Piping Two Zone Boiler Piping With Zone Valves Multi-Zone SystemsTwo Zone Boiler Piping With Circulators Page Page Page Expansion Tank And Make-Up Water Safety Relief ValveTerminate pipe with plain end not threaded Diaphragm Type Expansion Tank Piping Conventional Closed Type Expansion Tank Piping Condensate Drain Piping Reinstall vent drain lineFilling Condensate Trap With Water Chilled Water PipingConnections And Termination Combustion AIR and Vent PipeExample Elbow @ 3 ft. + 1 elbow @ 3 ft. = 6 equivalent ft. of pipeBoiler 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 ConnectionsGAS Supply Piping Connecting The Gas PipingCheck Gas Supply Leak Check Gas Piping625,000 Gas Pipe Sizes445,000 365,000Electric Power Supply Electrical WiringThermostat Installation Connect Circulator Pump WiringWiring Schematic Ladder Wiring Diagram Page Ladder Diagram for Figure Controls and Accessories Drain Valve Casting Temperature Safety SwitchDraft Inducer Circulator PumpStart UP To Turn Off Gas To Appliance Operating InstructionsUser Parameters Adjusting Settings S9381A Integrated Boiler Control Operation and AdjustmentsDisplay State Code Definitions Sequence of Operation Check OUT Procedure and Adjustment Review All Instructions Set Thermostat To Desired Room TemperatureVR8205 Maintenance and Cleaning Igniter wires Gas valve wires Annual Examination And Cleaning Of Boiler ComponentsRemove draft inducer and gasket from top of flue connector Initial Service Checks TroubleshootingError Codes Boiler Differential Pressure Differential AIR Pressure Switch CheckAluminum Series Fill Water and Chemistry Clean System FirstEliminate System Leaks 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

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