Bradford-White Corp BNTH Transformer with Integral Circuit Breaker, Blower, Heat Exchanger Coils

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11.2.6 Transformer with Integral Circuit Breaker

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BRADFORD WHITE CORP.

 

 

 

 

11.2.6 Transformer with Integral Circuit Breaker

The appliance has a 24Vac transformer with integral 4 amp circuit breaker installed for supplying the control voltage required for the appliance only. The transformer is sized for the appliance load only and should not be used to supply power to additional field devices. If additional loads are added or a short occurs during installation the integral circuit breaker may trip. If this happens make sure to reset the circuit breaker prior to replacing the transformer.

Depending upon the revision of the appliance the transformer may be mounted to the back or underneath the control panel. In either case, if the transformer must be replaced turn off the 120Vac power to the appliance. Remove the transformer wires from terminal blocks.

Remove the fasteners holding the transformer and remove the transformer. Replace with a new transformer in reverse order.

If the transformer is replaced with parts other than the OEM transformer, be sure to add circuit protection if it is not integral to the new transformer.

11.2.7 Blower WARNING

Failure to include proper circuit protection may lead to premature component failure, fire, injury or death.

11.2.7 Blower

The combustion air blower is a high-pressure centrifugal blower with a variable speed motor. Speed of the motor is determined by the control logic. 120 Volts remain 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 off. Disconnect the 120 Volt and control signal connections from the blower. Disconnect the bolts connecting the venturi to the blower housing. Disconnect the fan outlet bolts from the burner door blower arm. If the fan is determined to be defective replace the existing fan with a new one reversing the steps above. Make sure to install all of the required O-rings and gaskets between the blower arm and the blower and blower face and venturi flange.

11.2.8 Heat Exchanger Coils

Black carbon soot buildup on the external surfaces of the 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 heat 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 burner door at the front of the boiler, and inspect the tubing using a flashlight. If there is a buildup of black carbon soot or other debris on the heat exchanger, clean per the following:

11.2.8 Heat Exchanger Coils 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.Shut off the 120 Volt power supply to the boiler

2.Turn off all manual gas valves connecting the boiler to the main gas supply line.

3.For NT 600 models only (all other sizes please skip to step four). NT 600 models will require the gas valve to be removed in order to remove the burner door. To do this, remove the wire connections from the gas valve. Remove the flange bolts from the gas supply pipe connected to the gas valve (1B). Remove the flange bolts connecting the gas train to the venturi (1A). Remove the gas train assembly keeping gaskets and o-rings.

4.Remove the four bolts connecting the blower flange to the burner door arm.

5.Remove the nuts located on the outside diameter of the burner door to the heat exchanger.

6.Remove the burner door/burner assembly from the heat exchanger.

7.Disconnect the condensate drain line.

8.Attach a longer hose to drain and run to a bucket.

9.Clean the heat exchanger by brushing light accumulations of soot and debris. Use a brush with soft bristle (non metal) to avoid damaging the surface of the heat exchanger tubes.

10.Once the tubes have been brushed clean rinse the tubes and combustion chamber with a small amount of water to rinse all of the debris out of the bottom of the flue collector and into the longer condensate trap line, which is being diverted into a separate container.

NOTE: The Warranty does not cover damage caused by lack of required maintenance, lack of water flow, or improper operating practices.

Manual background WARNING

Failure to rinse the debris from the heat exchanger and temporary drain line may lead to clogged condensate lines, traps and neutralizers. Condensate pumps (if used) may also be damaged from the debris left behind, possibly causing property damage.

11.Install all components removed in the reverse order to place the appliance back in operation. Make sure all gaskets are in place as components are installed. Replace any damaged gaskets. Do NOT reuse damaged gaskets.

12.Place the appliance in operation according to Section 10 checking all gas connections for leaks. Confirm all fasteners are tight.

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Contents Installation and Operation Instructions DocumentInstallation and Operation Instructions for BRUTE ELITETABLE OF CONTENTS Brute Elite Control Setup and OperationSECTION General InformationSECTION Maintenance Trouble ShootingReplacement Parts SECTION Modes of OperationSECTION General Information 1.1 Introduction1.2 Model Identification Model NomenclatureFigure 1. Location of Components, Sizes Figure 2. Location of Components, SizesFigure 3. Location of Components, Size Figure 4. Location of Components, SizeFigure 5. Location of Components, Size Figure 6. Location of Components, SizeFigure 7. Location of Components, Sizes 750 and 1.4 Warranty 1.6 Dimensions1.3 Appliance Overview 1.5 UnpackingFigure 9. Dimensional Drawing, Sizes Dimensions are nominal and are shown in inches, cmBrute Elite is for indoor installations only SECTION Locating the Appliance2.1 Locating the Appliance SECTION Venting and Combustion Air 3.1 Combustion Air3.1.1 Combustion Air From Room 3.1.2 Ducted Combustion Air3.2 Venting Figure 10. Combustion Air and Vent Through RoofTable 5. Required Exhaust Vent Material 3.3 Locating Vent & Combustion Air Terminals 3.2.1 Venting Requirements Unique to CanadaA. exhaust vent terminal not included E. CPVC exhaust pipe section 80-500 not incl3.3.5 Installations in the Commonwealth of Massachusetts 3.3.2 Side Wall Combustion Air Terminal5. For concentric vent, follow instructions included with vent kit 3.3.3 Vertical Vent TerminalFigure 12. Combustion Air and Vent Through Side Wall 3.4 Common Vent Test 2. Approved Carbon Monoxide Detectors3. Signage 4. InspectionSECTION Gas Supply and Piping 4.1 Gas Supply and Piping3. Refer to Tables 6A, 6B, 6C and 6D to size piping SECTION Pump Requirements 5.1 Brute Elite Boiler Flow and Head Requirements see Table5.2 Brute Elite Water Heater Flow and Head Requirements see Table Table 6ASECTION 6A Water Connections - BNTH Boiler 6A.1 BNTH System Piping Hot Supply Connections6A.2 BNTH Cold Water Make-Up 6A.4 BNTH Suggested Piping Schematics 6A.3 Freeze Protection6A.5 Recognized Chemicals 1. Sentinel Performance Solutions Group 2. Hercules Chemical CompanyFigure 15. Hydronic Piping - Single Boiler zoning with circulators Brute Elite Figure 17. Hydronic Piping - Multiple Boilers zoning with circulators Brute Elite PagePage Brute Elite PagePage SECTION 6B 6B.1 BNTV Water Quality6B.2 Piping Requirements Water Connections - BNTV Water Heater6B.5 BNTV Suggested Piping Schematics 6B.3 Cold Water Make-Up6B.4 Freeze Protection 6B.6 BNTV Suggested PumpsFigure 25. DHW Piping, Two Heaters, One Vertical Tank Figure 26. DHW Piping, Two Heaters, Two Vertical TanksCaution Pump sizing must be based opon water hardness at job site7.1 Main Power SECTION Electrical Connections7.10 Lead Lag/ Cascading Wiring Connections 7.2 Pump Connections7.3 24Vac Transformer with Integral Circuit Breaker 7.4 Hydronic Call for HeatFigure 28. Lead-Lag / Cascading Wiring Connections 7.11 Wiring Diagrams see Figures 29 and Figure 29. Ladder DiagramFigure 30. Wiring Diagram all sizes SECTION Brute Elite Control Setup and Operation 8.1 Display Navigation8.2 Ignition Control- Sequence of Events 8.3 Modulation Control 8.5 Anti-Short Cycle ASC8.5 High Limit 8.7 Outlet Water Temperature8.12.5 Lead Lag Base Load Setting 8.13 Boiler Pump Interrupt8.12.1 Lead Lag Setpoint 8.12.2 Lead Lag Master/Slave Selection9.2 Hydronic Heating with Outdoor Reset 9.4 Hydronic Heating Using External Modulation ControlSECTION Modes of Operation 9.1 Hydronic Heating Demand9.5 Hydronic Heating Using Local Lead- Lag/Cascading Feature 9.7 Warm Weather Shutdown9.8 Domestic Hot Water Demand BNTV only Let’s consider the following example9.9 Domestic Hot Water Heating Using External Modulation Control 10.2 Operating the Burner and Set Up SECTION Operating Instructions10.1 Filling the Boiler System 10.2.1 Burner Operation10.2.2 Boiler Setup and Adjustment 10.3 Shutting Down Brute Elite10.4 To Restart Brute Elite 3. WAIT FIVE 5 MINUTES80-285 Figure 33A. Brute Elite Gas Valves 285, 399 andFigure 33B. Brute Elite Gas Valves 600, 750 and SECTION Maintenance 11.1 System Maintenance11.2 Appliance Maintenance and Component Description yearly, unless otherwise noted11.2.4 Ignitor Assembly 11.2.5 Flame SensorIgniters and sensors get hot and can cause burns or injury 11.2.6 Transformer with Integral Circuit Breaker 11.2.7 Blower11.2.8 Heat Exchanger Coils SECTION Trouble Shooting 12.3 Error Codes - See Table11.2.9 Gas Pressure Switches optional 12.1 Sequence of OperationPROBLEM SOLUTIONcontinued next page CODE#Table 18. Error Codes see SectionSECTION Replacement Parts 13.2 Parts List13.1 General Information Jacket Components - See FigureGas Train Components - See Figure Heat Exchanger Components - See Figure Contact Customer Service at 800 900-9275 Electrical Components - See FigureFigure 35. Jacket Components Figure 36A. Internal Components, Sizes Figure 36B. Internal Components, SizesFigure 36C. Internal Components, Sizes Figure 37A. Gas Train Components, Sizes Figure 37B. Gas Train Components, Sizes Figure 38. Heat Exchanger Components Figure 39. Electrical Components Brute Elite Tech. Service 800 Service Parts 800Warranty Service 800 Ambler, PA
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