Lennox International Inc Gas-Fired Hot Water Boiler, GWB9-075IH-2 Controls and Accessories

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CONTROLS AND ACCESSORIES

This section provides a brief description of the key controls and accessories found in this boiler.

See Figure 26, Page 41 for detailed sequence of operation. See the Repair Parts Manual for locations of all control components and accessories described.

Integrated Boiler Control (IBC)

Integrated Boiler Control (IBC) is a microprocessor based controller for high efficiency gas boiler that monitors

all safety controls and which controls operation of the combustion air blower, circulator pump, burner, and a combination direct spark igniter/flame sensor. This controller is not intended for use with a vent damper. Controller is mounted on control panel inside of boiler and contains a three character user interface display.

High Limit Control

High Limit Control determines maximum boiler water temperature and also provides means for protecting boiler and heating system from unsafe operating conditions which could damage boiler.

Limit control sensor is mounted in ¾” NPT control well on top of the front boiler section at hot water outlet.

Limit control is incorporated in IBC and is field adjustable between 80°F and 190°F.

Field setpoint adjustment for each installation depends on heating system requirements.

Limit Control automatically resets when boiler water temperature decreases (10-30°F adjustable differential).

Differential can be adjusted to provide flexibility for boiler operation. Larger the differential, longer run cycle of boiler.

Thermal Purge Operation

1.Thermal purge feature complies with 2012 DOE and NRCan requirements that boiler control must incorporate automatic means to adjust water temperature.

2.Intent of thermal purge is to insure usable residual heat in the boiler is circulated until it is sufficiently depleted from the system before the burner is allowed to fire. To that end, on call for heat, burner is held off while circulator runs until boiler temperature drops to thermal purge temperature limit or time delay is exceeded. Both of these parameters are adjustable.

3.When boiler temperature falls below thermal purge temperature limit or time delay expires, burner is allowed to fire.

In addition to thermal purge temperature and thermal purge time delay parameters, two other conditions release integrated boiler controller from thermal purge and allow burner to run in order to maintain comfort in the space.

•Boiler temperature has dropped 10°F from boiler water temperature measured at beginning of the call for heat.

•Boiler temperature is cooling at a rate greater than 5°F/minute while circulator is running.

4.For Installations using Indirect Hot Water Heater

Depending on the specific installation, thermal purge delay might or might not affect end user’s expectation for domestic hot water delivery. In event the customer has a concern that it takes too long for hot water, the situation may be resolved in three ways.

A.Add a Domestic Hot Water Module, ECR part Number 240009562 (Honeywell part number W8375s1008). This control senses when hot water is being drawn, and instructs the integrated boiler control to bypass the thermal purge operation until domestic how water draw ends. Thermal purge will then be re-enabled.

DHW module incorporates a temperature sensor installed at the indirect water heater’s hot water supply fitting ( Note - this sensor is in addition to, not in place of, the limit control on the hot water tank.) The Module is connected to the Enviracom terminals in the Integrated Boiler Control.

B.Thermal purge parameters may be adjusted (higher thermal purge temperature limit and/or shorter thermal purge time delay) to bring the burner on sooner.

C.Thermal purge function can be disabled.

Gas Control Valve

Electrically controlled Combination Gas Control Valve is designed to meet requirements for use with direct ignition systems found in this boiler. Valve is piped to gas/air mixer.

Direct Spark Igniter

Direct spark igniter utilizes a spark gap to initiate gas combustion in the burner. Igniter is mounted next to burner through gas/air mixer. The igniter also serves as means for proving main burner flame by flame rectification. In the event of a lack of flame signal on three (3) consecutive tri- als for ignition, IBC will lockout and display Error Code 62.

Draft Inducer Temperature Safety Switch

Draft Inducer Temperature Safety Switch is a disc thermostat (180 °F setpoint) located on induced draft fan outlet port. Switch protects inducer and vent pipe from potential high temperature condition for discharging flue gases. Condition would typically be result of higher high limit control setting or over firing. Temperature safety switch automatically resets when the vent temperature decreases. (15 °F switch differential).

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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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