Bradford-White Corp BRHHV Mixing Actuator, Ignition Control, Ignitor / Flame Sensor Assembly

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7.2.10 Mixing Actuator

The mixing actuator connects to both mixing valves and takes its signal from the mixing control to properly set the valves to protect the copper heat exchanger. To remove the actuator, remove the screw on the front to take the cover off. Disconnect the wires. Take the 2 nuts off the U-bolt, to move the linkage

to the side, out of the way. Slide the actuator out. Reassemble in reverse order.

7.2.11 Ignition Control

The ignition control ensures the proved interrupted-type ignition system. It controls the hot surface ignitor and proves that the flame signal is appropriate for powering the gas valves. It also controls the blower’s pre-purge and post-purge. To replace the control, shut off the 120-volt power to the appliance. Remove the cover from the control panel. Remove the electrical connectors from the ignition control. Take out the controller’s mounting screws, and pull the controller out. Replace in reverse order.

7.2.12Ignitor / Flame Sensor Assembly

The ignitor is a 110v “hot surface” type. It

is energized whenever there is a call for heat and switched off when ignition is established and the flame has been sensed. Ignitors with an ohms resistance over 80 ohms (tested after the ignitor has been allowed

to cool to room temperature) should be replaced. To replace the ignitor, shut off the 120-volt power to the appliance, disconnect the Molex connector, remove the two mounting screws on the ignitor flange, and pull the ignitor out. Always install a new ignitor gasket with the replacement ignitor.

Caution

Ignitor gets hot and can cause burns or injury.

7.2.13 Transformers

There are various transformers used on the Brute Magnum units. Be sure to replace the transformers with factory parts. These transformers are not capable of supplying control voltage for external devices such as zone valves, which must have their own separate power supply. Should a transformer need replacing, shut off the 120-volt power. Unplug the transformer wires, remove the mounting screws and remove the transformer. Replace transformer in the reverse order.

7.2.14 Blower

The combustion air blower is a high-pressure centrifugal blower with a variable speed motor. The speed of the motor is determined by the control logic, and the 120-volt current remains on to the blower at all times. If a blower change is required, turn off the 120- volt power and gas supply to the unit. Take the front

panel, the two side access panels, and the top jacket panel off. (If there is enough clearance on the side, the top may not have to be removed.) Disconnect the gas union between the blower and gas valves. Disconnect the filter box assembly (at the air transition) from the blower (six 8 mm bolts). Disconnect the two Molex electrical connectors from the top right of the blower. Remove the four nuts from the blower flange, and pull the blower out. Replace blower in reverse order, ensuring that all joints are made correctly and sealed. After replacement, ensure that the unit operates properly, by following the set-up procedure in this manual.

7.2.15 Flow Switch

The Brute Magnum uses a paddle-type flow switch to ensure that the unit has water flow before ignition is allowed.

7.2.16 Heat Exchanger Coils

Black carbon soot buildup on the external surfaces of the copper heat exchanger is caused by one or more of the following; incomplete combustion, combustion air problems, venting problems and heater short cycling. Soot buildup or other debris on the heat exchanger may restrict the flue passages.

If black carbon soot buildup on the copper exchanger is suspected, disconnect electrical supply to the unit, and turn off the gas supply by closing the manual gas valve on the unit. Access the heat exchanger through the side access panels, and inspect the finned copper tubing using a flashlight. If there is a buildup of black carbon soot or other debris on the heat exchanger, clean per the following:

Caution

Black carbon soot buildup on a dirty heat exchanger can be ignited by a random spark or flame. To prevent this from happening, dampen the soot deposits with a wet brush or fine water spray before servicing the heat exchanger.

1.Disconnect the electrical supply to the unit.

2.Turn off the gas supply by closing the manual gas valve on the heater.

3.Disconnect and remove the wires, conduit and sensors from all components that are attached to the inlet/outlet header.

4.Isolate the heat exchanger from the water supply.

5.Drain the heat exchanger from the drain located on the bottom of the heat exchanger.

6.Disconnect the header flanges from the inlet and outlet.

7.Remove the heat exchanger from the unit. NOTE: The heat exchangers are heavy and may require two people to remove to avoid personal injury.

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Contents Βρυτε Μαγνυμ Βραδφορδ Ωηιτε Χορπ Troubleshooting Table of ContentsMaintenance Replacement PartsList of Tables List of FiguresModel Identification General InformationIntroduction Model DesignationWarranty DimensionsLocating the Appliance Inches 91cm horizontally Combustion Air From Room Venting and Combustion AIRCombustion Air Intake Combustion AirVenting Locating Vent & Combustion Air TerminalsHorizontal Vent Terminal Combustion Air and Vent Through Side Wall Installation of Carbon Monoxide Detectors From Massachusetts Rules and Regulations 248 CMRVertical Vent Terminal Common Vent Test BoilersSide Wall Combustion Air Terminal Vertical Combustion Air TerminalGAS Supply and Piping Distance from Gas Meter or Last Stage RegulatorWater Connections Brute Magnum Boiler 4A.1 Heating System Piping Hot Supply Connections Boiler4A.2 Cold Water Make-Up Boiler 4B.1 Water System Piping Water Heater Water Connections Brute Magnum Water Heater4A.3 Freeze Protection Boiler 4B.2 Hot Water Supply Piping Water Heater4B.3 Water Flow Requirements Water Heater Hydronic Piping Multiple BoilersHydronic Piping Multiple Boilers Alternate Hydronic Piping One Boiler, Multi-Temperature System 4B.4 Combined Water potable Heating and Space HeatingHeater or in the pipes in the system. When water 4B.5 Freeze Protection Water HeaterWater Heater Piping One Heater, One Tank Water Heater Piping Multiple Heaters, One Tank Water Heater Piping One Heater, Multiple Tanks Water Heater Piping Multiple Heaters, Multiple Tanks Temperature Control Water Heater Main PowerTemperature Control Boiler Electrical ConnectionsTemperature Setpoint Temperature Control FeaturesInternal Water Heater Temperature Control Differential SettingOffset Throttling RangeMinimum Output Setting Integration ConstantMixing System and Control Control Parameter Possible InterferenceWiring Diagrams External Control ConnectionsWiring Diagram, Size 1200, Standard and Codes a and F Βρυτε Μαγνυμ Wiring Diagram, Size 1200, Code B Wiring Diagram, Sizes 1600, 2000 and 2400, Code B Wiring Schematic, Model 1200, Standard and Codes a and F Wiring Schematic, Model 1200, Code B Operating the Burner and Set Up Operating InstructionsFilling the Boiler System Gas/Air Test Panel Appliance Maintenance Component Description MaintenanceSystem Maintenance Shutting Down the Brute MagnumGas Trains Burner FilterModulating Gas Valve Auto Reset Temperature Limit Safety Gas ValveManual Reset High Limit Control Mixing ControlMixing Actuator Ignitor / Flame Sensor AssemblyFlow Switch Ignition ControlGas Pressure Switches TroubleshootingMotorized Safety Valve Sequence of OperationDelayed Ignition Possible Causes Resolving LockoutsShort Cycling Boiler Replacement Parts Short Cycling Water HeaterHigh Gas Consumption Parts List Combustion Components See FigureElectrical Components See Figure Jacket See Figure Combustion Components Gas Train/Combustion Air Components Gas Train Components Electrical Components Heat Exchanger / Water Path Components Heat Exchanger / Water Path Components Jacket Components Litho in U.S.A. Bradford White 1102 Document
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