Bradford-White Corp BWCV warranty Internet Version for Reference Only, Boiler Maximum BOIL MAX

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6.3.4 Boiler Maximum (BOIL MAX)

Internet Version for Reference Only

Copper Brute II

Page 27

 

 

 

 

6.3.4 Boiler Maximum (BOIL MAX)

The boiler maximum (BOIL MAX) is the highest water temperature that the control is allowed to use as a target temperature. If the control does target BOIL MAX, and the heater outlet sensor is near the BOIL MAX temperature, the MAX segment turns

on in the LCD while the target, inlet, outlet or supply temperature is viewed (see Figure 14).

Figure 14. Temperature Control Min & Max Graph.

6.3.5Boiler Target Temperature

The target temperature is determined from

the mode of operation. The control displays the temperature that is currently trying to maintain at the operating sensor as BOIL TARGET in the View menu. The operating sensor for modes 1, 3 and 4 is the outlet sensor (on the heater). The operating sensor for modes 2 and 5 is the supply sensor (in the system or primary loop). If the control does not presently have a requirement for heat, it displays “- - -” in the LCD. There is no target temperature generated in mode 6 (external controller mode).

6.3.6 Pump Operation

The pump terminals (Pmp Pmp) are energized with 24 VAC to control a field supplied pump contactor. During set point operation (modes 1 and 2), the terminals are energized whenever there is a heat demand. During dedicated DHW operation (mode 3), the terminals are energized whenever there is an internal heat demand. During outdoor reset (modes 4 and 5), the terminals are energized whenever there is either a heat demand and the control is not in Warm Weather Shut Down (WWSD), or whenever there is

a set point demand. During WWSD, if the pump has not operated at least once every 70 hours, the control energizes the terminals for 10 seconds. This minimizes the possibility of the pump seizing during a long period of inactivity. During External Heater Operation (mode 6), the pump contact closes whenever there is a heat demand.

Boiler Purge (PUMP DLY) – After a demand is satisfied, the control continues to operate the pump for a period of time. The length of time that the pump continues to run is based on the pump delay setting.

Once the last stage of the control turns off, the control keeps the pump contacts energized for the time selected (between 0 and 10 minutes). When OFF is selected, there is no purging. When ON is selected, pump operation is continuous. Also, during outdoor reset, with the pump delay set to ON, the pump continues to run even during Warm Weather Shut Down.

6.3.7 Set point Operation

When either mode 1 or 2 is selected, the control controls the water temperature based on a fixed set point. The set point temperature is set using the BOIL TARGET item in the Adjust menu.

Heat Demand – For “heat demand” to exist, there must be continuity between the Com D (common demand) and the Ht D (heat demand) terminals. The heater ships with a jumper between these terminals.

The control also evaluates the sensor(s) installed in the system, including the outlet sensor provided on the heater when using mode 1. When the control senses continuity between Com D and Ht D terminals, and that the sensor reading is below the target temperature, the control will activate the Dem segment in the display.

The control energizes the pump (on pump mounted heater) and energizes the Pmp Pmp terminals. The heater pump segment is turned on in the display. The control then operates the stages to maintain the set point temperature.

6.3.8Dedicated Domestic Hot Water

When mode 3 is selected, the control provides

dedicated domestic hot water operation.

Internal DHW Demand – A sensor is required to be connected on the SC2 and Sup/S terminals. An internal demand for DHW is generated when the temperature demand for DHW sensor drops 1⁄2 of the tank differential setting below the desired DHW tank temperature. The TANK TARGET setting is used to set the desired DHW tank temperature.

Once an internal demand is generated, the Dem segment turns on in the LCD. The control then closes the Pmp Pmp contact, which starts the pump and the control turns on the heater pump segment in the display. The control then operates the stages to maintain the programmed heater target temperature at the heater outlet sensor.

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Contents Copper Brute Internet Version for Reference OnlyInstallation and Operation Instructions for Installation and Operation InstructionsSECTION 9. Wiring Diagrams TABLE OF CONTENTSSECTION 7. Maintenance SECTION 8. Trouble ShootingSECTION General Information 1.1 Introduction1.2 Model Identification 1.4 Dimensions 1.3 Warranty1.5 Locating the Appliance Figure 1. Dimensional Data 2.1 Combustion Air SECTION Venting and Combustion Air1.6 Locating Pump-Mounted Water Heater with Respect to Storage Tanks From Outside Wall2.1.2 Intake Combustion Air 2.2.3 Common Venting Systems 2.2 Venting2.2.1 Vent Categories 2.2.2 Category I VentFigure 3. Combustion Air and Vent Through Side Wall 2.3.2 Side Wall Combustion Air Terminal 2.3 Locating Vent & Combustion Air TerminalsImportant Note Massachusetts Code Requirement 2.3.1 Side Wall Vent Terminal2.3.4 Vertical Combustion Air Terminal 2.4 Common Vent Test2.5 Vent Terminals for Outdoor Units 2.3.3 Vertical Vent Terminal3.1 Gas Supply and Piping SECTION Gas Supply and Piping4.3 Water Flow Requirements - Water Heater SECTION Water Connections Copper Brute II Water Heater4.1 Water System Piping Water Heater 4.2 Hot Water Supply Piping - Water HeaterFigure 4. Water Heater Piping - One Heater, One Tank Table 8. Water Flow RequirementsFigure 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 4.5 Freeze Protection - Water Heater 5.1 Main PowerSECTION Electrical Connections 4.4 Combined Water Heating potable and Space Heating - Water HeaterAVERTISSEMENT 5.3 External Staging Control WiringSECTION Operating Instructions 6.1 Sequence of Operation6.2 Programming the Temperature Control 6.2.3 Programming 6.2.1 System Piping “Primary Secondary Piping”“Parallel Piping” 6.2.2 Choosing the Mode6.3.3 for more information BOIL MAX Boiler Maximum Temperature Boiler Start BOIL START The BOIL Mechanical aquastat in a domestic hot water storage tank 6.2.4 Choosing the Mode for your ApplicationMode 5 Primary secondary piping with outdoor reset 6.3 Advanced Topics6.3.1 Differential 6.3.2 Staging Mode6.3.3 Boiler Minimum BOIL MIN 6.3.7 Set point Operation 6.3.4 Boiler Maximum BOIL MAX6.3.5 Boiler Target Temperature 6.3.6 Pump Operation6.3.9 Outdoor Reset Operation Outdoor Design OUTDR DSGN - The6.3.10 External Heater Operation 6.3.12 Advanced Programming Mode 6.4 Operating the Burner and Set Up6.4.1 Set Up for 0 to 2500 Feet Altitude 6.3.11 Limit Controls6.6 To Restart the Copper Brute SECTION Maintenance7.1 System Maintenance 6.5 Shutting Down the Copper Brute7.2 Appliance Maintenance and Component Description 7.2.2 Filter 7.2.4 Manual Reset High Limit Control7.2.5 Automatic Reset High Limit Control 7.2.1 Burners7.2.11 Blowers 7.2.12 Flow Switch7.2.9 Ignition Sensors 7.2.10 Transformer8.3 Short Cycling SECTION Trouble Shooting8.1 Resolving Lockouts 8.2 Delayed Ignition - Possible CausesDESCRIPTION OF ERROR ERROR DISPLAYED8.6 Troubleshooting Copper Brute II Controls Figure 18. Copper Brute II 500 - 750 Ladder Diagram SECTION Wiring DiagramsFigure 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 MODE Reference OnlyWiring for Modes 1 Figure 24. FieldCopper Brute II 1250, 1500, 1750 & 2000 4-Stage Heater Version for Reference Only25. Field Wiring for Mode Internet
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