Bradford-White Corp BWCV warranty Internet Version for Reference Only, Bradford White

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6.2.4 Choosing the Mode for your Application

Internet Version for Reference Only

Page 24

Bradford White

 

 

 

 

Step 3: Press the three programming buttons to enter “ADJUST” mode (Figure 10). Press “Item” to select the programming item, and the arrow keys to adjust the setting. See section 6.2 Programming the Temperature Control if more programming instructions are needed.

Recommended settings for hydronic system with

180°F / 83°C primary loop temperature:

Item

F°

C°

MODE

2

2

BOIL TARGET

180

83

BOIL MASS

1

1

DIFF

20

10

DLY

5:00

5:00

F°

F°

°C

Step 4: See section 6.3.11 Limit Controls. Set both high limit controls at least 25°F / 14°C higher than the BOIL TARGET to allow for temperature rise across the heat exchanger.

6.2.4 Choosing the Mode for your Application

This section describes various applications and the recommended field wiring and Mode selections.

Water heater systems with Copper Brute II heater(s) and tank(s) will almost always use either mode 1 or mode 3. All other modes are for boiler applications. These modes are described in this manual for completeness, since they are accessible in the water heater control software.

Mode 1: Heater operates using its own inlet and outlet sensors only, not relying on a remote thermostat, aquastat, or external sensor.

This setup is most commonly found in domestic hot water applications with a continuous run pump. This is not recommended for other applications.

The heater is shipped with a jumper between the “Com D” and “Ht D” terminals, which must remain in place to allow the unit to fire. The unit will fire whenever the outlet temperature cools below the target temperature.

Important Note: If the heater is pump-mounted at the factory, or if a field-supplied pump contractor is connected to the heater’s pump contactors (Pmp Pmp), the user must program the controller’s pump delay (DLY) setting to ON. When ON is selected, pump operation is continuous. The unit’s inlet and outlet sensors must be able to detect the temperature in the storage tank in order to control it. Without the tank water continuously running through the heater, the heater will have no way of knowing what the temperature in the tank is, and will not be able to respond to a change in tank temperature. Short cycling or lack of hot water may result if the pump does not run continuously.

Mechanical aquastat in a domestic hot water storage tank.

Remove the jumper from the “Com D” and “HtD” terminals and connect the aquastat’s leads to these terminals. This connection uses a standard, non- powered mechanical aquastat. When the aquastat calls for heat, the heater’s temperature control will respond and start the heater pump (if equipped) and fire the heater.

If the heater is not a pump mounted model, a 24VAC pump contactor may be connected to the “PMP” terminals to control a field installed pump. (If desired, the pump can run continuously, with the aquastat telling the heater when to fire.)

Program the temperature control to use “Mode 1.” The AUTO/MAN switch must be in the AUTO position in this mode.

Mode 3: Bradford White R2014800 sensor installed in the domestic hot water storage tank.

The heater ships with a jumper between the “Com D” and “Ht D” terminals. Verify this jumper is in place, and connect the sensor leads to the “S C2” and “SUP S” terminals. When the sensor detects a temperature below the target temperature, the control will respond and start the heater pump (if equipped) and fire the heater.

If the heater is not a pump mounted model, a 24VAC pump contactor may be connected to the “PMP” terminals to control a field installed pump. (If desired, the pump can run continuously).

Program the temperature control to use “Mode 3.” The AUTO/MAN switch must be in the AUTO position in this mode.

Mechanical aquastat in a domestic hot water storage tank.Caution

If the tank temperature control is set too high, a potential for hot water scalding may exist.

Mode 2: Primary secondary piping. Install a “supply sensor” in the primary loop

using the Bradford White part number R2014800 sensor (included with every unit). Connect the sensor to the “S C2” and “SUP S” terminals.

You must provide an indication of the system’s heat demand by removing the jumper across the “ComD” and “HtD” terminals on the field wiring panel and connecting a zone valve or zone pump end switch, thermostat, aquastat or other contact closure to these terminals. If the “ComD” and “HtD” terminals are left jumpered, the control will always see a heat demand and remain in “Dem” mode, with the boiler pump running continuously. See Section 5.2 for more information.

A secondary aquastat, such as for a separate heat exchanger for DHW, can be connected to the “Set D” and “Com D” terminals. A call for heat from these controls will start the boiler pump and cause the heater to fire.

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Contents Internet Version for Reference Only Installation and Operation Instructions forInstallation and Operation Instructions Copper BruteTABLE OF CONTENTS SECTION 7. MaintenanceSECTION 8. Trouble Shooting SECTION 9. Wiring DiagramsSECTION General Information 1.1 Introduction1.2 Model Identification 1.4 Dimensions 1.3 Warranty1.5 Locating the Appliance Figure 1. Dimensional Data SECTION Venting and Combustion Air 1.6 Locating Pump-Mounted Water Heater with Respect to Storage TanksFrom Outside Wall 2.1 Combustion Air2.1.2 Intake Combustion Air 2.2 Venting 2.2.1 Vent Categories2.2.2 Category I Vent 2.2.3 Common Venting SystemsFigure 3. Combustion Air and Vent Through Side Wall 2.3 Locating Vent & Combustion Air Terminals Important Note Massachusetts Code Requirement2.3.1 Side Wall Vent Terminal 2.3.2 Side Wall Combustion Air Terminal2.4 Common Vent Test 2.5 Vent Terminals for Outdoor Units2.3.3 Vertical Vent Terminal 2.3.4 Vertical Combustion Air TerminalSECTION Gas Supply and Piping 3.1 Gas Supply and PipingSECTION Water Connections Copper Brute II Water Heater 4.1 Water System Piping Water Heater4.2 Hot Water Supply Piping - Water Heater 4.3 Water Flow Requirements - Water HeaterTable 8. Water Flow Requirements Figure 4. Water Heater Piping - One Heater, One TankFigure 5. Water Heater Piping - Multiple Heaters, One Tank Figure 6. Water Heater Piping - One Heater, Multiple Tanks Figure 7. Water Heater Piping - Multiple Heaters, Multiple Tanks 5.1 Main Power SECTION Electrical Connections4.4 Combined Water Heating potable and Space Heating - Water Heater 4.5 Freeze Protection - Water Heater5.3 External Staging Control Wiring AVERTISSEMENTSECTION Operating Instructions 6.1 Sequence of Operation6.2 Programming the Temperature Control 6.2.1 System Piping “Primary Secondary Piping” “Parallel Piping”6.2.2 Choosing the Mode 6.2.3 Programming6.3.3 for more information BOIL MAX Boiler Maximum Temperature Boiler Start BOIL START The BOIL 6.2.4 Choosing the Mode for your Application Mechanical aquastat in a domestic hot water storage tank6.3 Advanced Topics Mode 5 Primary secondary piping with outdoor reset6.3.1 Differential 6.3.2 Staging Mode6.3.3 Boiler Minimum BOIL MIN 6.3.4 Boiler Maximum BOIL MAX 6.3.5 Boiler Target Temperature6.3.6 Pump Operation 6.3.7 Set point Operation6.3.9 Outdoor Reset Operation Outdoor Design OUTDR DSGN - The6.3.10 External Heater Operation 6.4 Operating the Burner and Set Up 6.4.1 Set Up for 0 to 2500 Feet Altitude6.3.11 Limit Controls 6.3.12 Advanced Programming ModeSECTION Maintenance 7.1 System Maintenance6.5 Shutting Down the Copper Brute 6.6 To Restart the Copper Brute7.2 Appliance Maintenance and Component Description 7.2.4 Manual Reset High Limit Control 7.2.5 Automatic Reset High Limit Control7.2.1 Burners 7.2.2 Filter7.2.12 Flow Switch 7.2.9 Ignition Sensors7.2.10 Transformer 7.2.11 BlowersSECTION Trouble Shooting 8.1 Resolving Lockouts8.2 Delayed Ignition - Possible Causes 8.3 Short CyclingERROR DISPLAYED DESCRIPTION OF ERROR8.6 Troubleshooting Copper Brute II Controls SECTION Wiring Diagrams Figure 18. Copper Brute II 500 - 750 Ladder DiagramFigure 19. Copper Brute II 1000 Ladder Diagram Figure 20. Copper Brute II 1250 - 2000 Ladder Diagram Figure 21. Copper Brute II 500 - 1000 Wiring Schematic Figure 22. Copper Brute II 1250 - 2000 Wiring Schematic Note Positions of field wiring terminals may vary, but Figure 23. Field Wiringterminal designations are as indicated Reference Only Wiring for Modes 1Figure 24. Field MODEVersion for Reference Only 25. Field Wiring for ModeInternet Copper Brute II 1250, 1500, 1750 & 2000 4-Stage Heater
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