Bradford-White Corp BWCH, BWCV Boiler Minimum Boil MIN, Boiler Maximum Boil MAX, Pump Operation

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COPPER BRUTE II (500 - 2000)

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minimum amount of time before turning on the next stage. After the minimum time delay between stages has expired, the control examines the control error to determine when the next stage is to fire. The control error is determined using PID logic.

Proportional compares the actual operating sensor temperature to the boiler target temperature. The colder the temperature, the sooner the next stage is turned on.

Integral compares the actual operating sensor temperature to the boiler target temperature over a period of time.

Derivative determines how fast or slow the operating sensor temperature is changing. If the temperature is increasing slowly, the next stage is turned on sooner. If the temperature is increasing quickly, the next stage is turned on later, if at all.

Boiler Mass (BOIL MASS) – The boiler mass setting allows the installer to adjust the control to the thermal mass of different types of heat sources used. The boiler mass setting automatically determines the interstage differential, interstage delay on, interstage delay off, minimum on time and minimum off time of the stages when PID staging is used. A higher thermal mass setting provides slower staging, while a lower thermal mass setting provides faster staging. Copper Brute II boilers and water heaters are low-mass appliances, and therefore, should be used with the lower thermal mass setting. Set BOIL MASS to “1”.

6.4.3 Boiler Minimum (BOIL MIN)

The minimum boiler setting (BOIL MIN) is the

Figure 29. Temperature Control Min & Max.

lowest water temperature that the control is allowed to use as a target temperature. During mild conditions, if the control calculates a target temperature that is below this setting, the target temperature is adjusted to at least the minimum setting. During this condition, if the unit is operating, the MIN segment turns on in the LCD while the target temperature or operating sensor temperature is viewed. For Copper Brute II units, this must be set no lower than 120°F (49°C) to protect the unit

from condensing on the heat exchanger (see Figure 29).

6.4.4 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 boiler 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 29).

6.4.5Boiler 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 Copper Brute II). 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).

6.4.6 Pump Operation

The pump terminals (Pmp Pmp) are energized with 24 VAC to control a field supplied pump contactor. During setpoint 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 setpoint 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 Boiler 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

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Contents Copper Brute Table of Contents Operating Instructions MaintenanceTrouble Shooting Replacement PartsIntroduction General InformationModel Identification Dimensions WarrantyLocating the Appliance Dimensional Data Inches 91cm horizontally Intake Combustion Air Venting and Combustion AirCombustion Air Combustion Air From RoomCommon Venting Systems VentingVent Categories Category I VentCombustion Air and Vent Through Side Wall Side Wall Combustion Air Terminal Locating Vent & Combustion Air TerminalsCategory III Vent Side Wall Vent TerminalVertical Combustion Air Terminal Common Vent Test BoilersVent Terminals for Outdoor Units Vertical Vent Terminal61-91m Gas Supply and Piping4A.3 Water Flow Requirements Boiler Water Connections Copper Brute II Boiler4A.1 Heating System Piping Hot Supply Connections Boiler 4A.2 Cold Water Make-Up BoilerHydronic Piping Multiple Boilers, Primary Secondary System Hydronic Piping Multiple Boilers, Low Temperature System Hydronic Piping One Boiler, Multi-Temperature System Hydronic Piping Primary-Secondary, Reverse-Return Boiler CIRC. Pump Sized for Flow Through Boiler 4B.3 Water Flow Requirements Water Heater Water Connections Copper Brute II Water Heater4B.1 Water System Piping Water Heater 4B.2 Hot Water Supply Piping Water HeaterSupply 4B.5 Freeze Protection Water HeaterWater Heater Piping Multiple Heaters, One Tank Water Heater Piping Multiple Heaters, Multiple Tanks Temperature Control Main PowerElectrical Connections Field Wiring Panel Avertissement External Staging Control WiringCopper Brute II 500 750 Ladder Diagram Copper Brute II 1000 Ladder Diagram Copper Brute II 1250 2000 Ladder Diagram Copper Brute II 500 1000 Wiring Schematic Copper Brute II 1250 1500 Wiring Schematic Copper Brute II 1750 2000 Wiring Schematic Terminal designations are as indicated Field Wiring for Modes 1 Avertissement Sequence of Operation Operating InstructionsFilling the Boiler System Parallel Piping Programming the Temperature ControlChoosing the Mode System Piping Primary Secondary PipingFor ALL Other Modes Hydronic Primary/Secondary Mode Mechanical aquastat in a domestic hot water storage tank Choosing the Mode for your ApplicationMode 5 Primary secondary piping with outdoor reset Advanced Topics Staging ModeDifferential Pump Operation Boiler Target TemperatureBoiler Minimum Boil MIN Boiler Maximum Boil MAXSetpoint Operation Outdoor Reset OperationDedicated Domestic Hot Water Typical Gas Train Configuration External Boiler Operation Operating the Burner and Set UpAdvanced Programming Mode Set Up for 0 to 2500 Feet AltitudeShutting Down the Copper Brute High Altitude Adjustment and Set UpTo Restart the Copper Brute System Maintenance MaintenanceAppliance Maintenance Component Description Ignitors Temperature ControlFlow Switch Ignition ControlsBradford White Corp Trouble Shooting Troubleshooting Copper Brute Controls Troubleshooting the Temperature ControlCopper Brute II 500 Troubleshooting Error Codes Parts List Replacement PartsSee Figures 35 Heat Exchanger Components Electrical Components Gas Train Components Burner Manifold Assy, 4 Burners, Left, LP For reference Internal Components Copper Brute II Hydronic Electrical Components H2214401F
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