Bradford-White Corp BRHHH Replacement Parts, Short Cycling Water Heater, High Gas Consumption

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8.5Short Cycling — Water Heater

Short cycling will generally occur only in

combination space heating and water heating applications when the water heater is operating in the space-heating mode. Because the Brute Magnum is a modulating water heater and its input will reduce when there is a reduction in heating load, short cycling is greatly reduced. If the heating load drops below the minimum input of the water heater for an extended period, the water heater will have a tendency to short cycle. If short cycling is frequently experienced, regardless of the control’s attempt to limit it, the heating load should be redistributed to control it. See Section 5.5 regarding controller setup.

If short cycling occurs in a water heater application, it is probably caused by undersized piping between the water heater and the storage tank or by some other factor that restricts proper water flow through the water heater. The cause should be determined and corrected.

8.6High Gas Consumption

Appliances operating with an improper air/

fuel ratio are very inefficient and consequently, have very high gas consumption. Because efficiency is high when the CO2 is high (or O2 is low), appliances operating with low CO2 or high O2 (especially LP appliances) consume more gas. Adjust the CO2 or O2 for optimum efficiency. If no combustion analyzing equipment (CO2 or O2) is available then a proper adjustment of the air/fuel ratio (CO2 or O2) can not be accomplished. However, by briefly sniffing the flue gases it is possible to determine if the CO2 or O2 is within the proper range. No significant flue gas odor should be detected when combustion is proper. A strong piercing smell indicates poor combustion and generally a lean mixture - low CO2 or high O2 . The CO2 should be 8 to 9% at all firing rates. Do not attempt to correct combustion. Contact factory if the CO2 is not within this range.

Section 9

REPLACEMENT PARTS

Only genuine Bradford White replacement parts should be used.

9.1General Information

To order or purchase parts for the Brute

Magnum, contact your nearest Bradford White dealer or distributor. If they cannot supply you with what you need, contact Customer Service (see back cover for information).

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Contents Βρυτε Μαγνυμ Βραδφορδ Ωηιτε Χορπ Maintenance Table of ContentsTroubleshooting Replacement PartsList of Figures List of TablesIntroduction General InformationModel Identification Model DesignationWarranty DimensionsLocating the Appliance Inches 91cm horizontally Combustion Air Venting and Combustion AIRCombustion Air From Room Intake Combustion AirVenting Locating Vent & Combustion Air TerminalsHorizontal Vent Terminal Combustion Air and Vent Through Side Wall From Massachusetts Rules and Regulations 248 CMR Installation of Carbon Monoxide DetectorsSide Wall Combustion Air Terminal Common Vent Test BoilersVertical Vent Terminal Vertical Combustion Air TerminalDistance from Gas Meter or Last Stage Regulator GAS Supply and PipingWater Connections Brute Magnum Boiler 4A.1 Heating System Piping Hot Supply Connections Boiler4A.2 Cold Water Make-Up Boiler 4A.3 Freeze Protection Boiler Water Connections Brute Magnum Water Heater4B.1 Water System Piping Water Heater 4B.2 Hot Water Supply Piping Water HeaterHydronic Piping Multiple Boilers 4B.3 Water Flow Requirements Water HeaterHydronic Piping Multiple Boilers Alternate 4B.4 Combined Water potable Heating and Space Heating Hydronic Piping One Boiler, Multi-Temperature System4B.5 Freeze Protection Water Heater Heater or in the pipes in the system. When waterWater 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 Boiler Main PowerTemperature Control Water Heater Electrical ConnectionsInternal Water Heater Temperature Control Temperature Control FeaturesTemperature Setpoint Differential SettingThrottling Range OffsetIntegration Constant Minimum Output SettingControl Parameter Possible Interference Mixing System and ControlExternal Control Connections Wiring DiagramsWiring 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 System Maintenance MaintenanceAppliance Maintenance Component Description Shutting Down the Brute MagnumGas Trains Burner FilterModulating Gas Valve Manual Reset High Limit Control Safety Gas ValveAuto Reset Temperature Limit Mixing ControlFlow Switch Ignitor / Flame Sensor AssemblyMixing Actuator Ignition ControlMotorized Safety Valve TroubleshootingGas Pressure Switches Sequence of OperationDelayed Ignition Possible Causes Resolving LockoutsShort Cycling Boiler Replacement Parts Short Cycling Water HeaterHigh Gas Consumption Combustion Components See Figure Parts ListElectrical 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