Bradford-White Corp BWCV, BWCH warranty Advanced Topics, Differential, Staging Mode

Page 42

Page 42

BRADFORD WHITE CORP.

 

 

 

 

6.4 Advanced Topics

For most installations, Section 6.3 provides all the information required to set up the Copper Brute

IIboiler, and this section should be skipped. Continue setup in Section 6.5.

This section provides definitions of the pro- gramming parameters, advanced programming topics, and other information that may be of interest.

Advanced programming mode allows the installer to set the temperature control for proportional staging. In advanced programming mode, the interstage differential, interstage delay, interstage on and off delay, and minimum time on and off are all set manually.

NOTE: Advanced programming mode is not required in most applications, and is intended for advanced installers only.

To enter advanced programming mode, remove the bezel on the temperature control by pulling out at the bottom. Remove the small phillips head screw to access the dip switch. The dip switch is mounted on a circuit board. Locate the letter “A” on the circuit board and slide the corresponding dip switch toward the letter “A”. The default setting of this dip switch is toward the OFF lettering on the circuit board.

6.4.1 Differential

Differential has an abbreviated name of DIFF. An on/off heat source must be operated with a differential in order to prevent short cycling. The differential

is divided around the boiler target temperature (see Figure 28). The first stage contact will close when the water temperature at the operating sensor is one-half of the differential setting below the target temperature. It will open when the water temperature at the operating sensor is one-half of the differential setting above the target temperature. The remaining stages will operate sequentially, based on the staging mode selected.

6.4.2 Staging Mode

The Copper Brute II 500 and 750 control operates two stages. The Copper Brute II 1000 control operates three stages. The Copper Brute II control for models 1250–2000 operates four stages. The method of staging used by the control is either P (proportional) or PID (proportional & integral & derivative), and is selected using the STGMODE item in the ADJUST menu.

Proportional (P) – Proportional staging, also known as step staging, is based on manually adjusted settings which determine when the next stage is required to turn on. These manual settings are based on temperature and time. The interstage differential sets the temperature drop at which the next stage turns on. However, in order for a stage to fire, the interstage delay on and minimum off times must first elapse.

Interstage Differential (STG DIFF) – The interstage differential is the temperature drop at which the next stage will turn on. Once a stage turns on, the next stage cannot turn on until the temperature drops the interstage differential below the temperature at which the previous stage turned on. The interstage differential is adjustable through the STG DIFF setting in the Adjust menu (see Figure 28).

Interstage Delay On (ON DLY) – The interstage delay on is the amount of time that must elapse before turning on the next stage. Once a stage turns on, the next stage cannot turn on until the interstage delay on time elapses. The interstage delay on is adjustable through the ON DLY setting in the Adjust menu.

Interstage Delay Off (OFF DLY) – The interstage delay off is the amount of time that must elapse before turning off the next stage. Once a stage turns off, the next stage cannot turn off until the interstage delay off time elapses. The interstage delay off is adjustable through the OFF DLY setting in the Adjust menu.

Minimum On Time (MIN ON) – The minimum on time is the minimum amount time that a stage must be on before it is allowed to turn off. Once a stage turns on, it cannot turn off until a minimum on time elapses. The minimum on time is adjustable through the MIN ON setting in the Adjust menu.

Minimum Off Time (MIN OFF) – The minimum off time is the minimum amount time that a stage must be off before it is allowed to turn on. Once a stage turns off, it cannot turn on until a minimum off time elapses. The minimum off time is adjustable through the MIN OFF setting in the Adjust menu.

Proportional & Integral & Derivative (PID)

–PID staging allows the control to determine when the next stage is required to turn on. The control automatically determines the settings that are manually selected in proportional staging mode. After each stage is turned on in the firing sequence, the control waits a

Figure 28. Temperature Control Interstage Differential.

Page 41 Page 43
Image 42
Page 41 Page 43
Contents Copper Brute Table of Contents Replacement Parts MaintenanceTrouble Shooting Operating InstructionsGeneral Information IntroductionModel Identification Warranty DimensionsLocating the Appliance Dimensional Data Inches 91cm horizontally Combustion Air From Room Venting and Combustion AirCombustion Air Intake Combustion AirCategory I Vent VentingVent Categories Common Venting SystemsCombustion Air and Vent Through Side Wall Side Wall Vent Terminal Locating Vent & Combustion Air TerminalsCategory III Vent Side Wall Combustion Air TerminalVertical Vent Terminal Common Vent Test BoilersVent Terminals for Outdoor Units Vertical Combustion Air TerminalGas Supply and Piping 61-91m4A.2 Cold Water Make-Up Boiler Water Connections Copper Brute II Boiler4A.1 Heating System Piping Hot Supply Connections Boiler 4A.3 Water Flow Requirements 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.2 Hot Water Supply Piping Water Heater Water Connections Copper Brute II Water Heater4B.1 Water System Piping Water Heater 4B.3 Water Flow Requirements Water Heater4B.5 Freeze Protection Water Heater SupplyWater Heater Piping Multiple Heaters, One Tank Water Heater Piping Multiple Heaters, Multiple Tanks Main Power Temperature ControlElectrical Connections Field Wiring Panel External Staging Control Wiring AvertissementCopper 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 Operating Instructions Sequence of OperationFilling the Boiler System System Piping Primary Secondary Piping Programming the Temperature ControlChoosing the Mode Parallel PipingFor ALL Other Modes Hydronic Primary/Secondary Mode Choosing the Mode for your Application Mechanical aquastat in a domestic hot water storage tankMode 5 Primary secondary piping with outdoor reset Staging Mode Advanced TopicsDifferential Boiler Maximum Boil MAX Boiler Target TemperatureBoiler Minimum Boil MIN Pump OperationOutdoor Reset Operation Setpoint OperationDedicated Domestic Hot Water Typical Gas Train Configuration Set Up for 0 to 2500 Feet Altitude Operating the Burner and Set UpAdvanced Programming Mode External Boiler OperationHigh Altitude Adjustment and Set Up Shutting Down the Copper BruteTo Restart the Copper Brute Maintenance System MaintenanceAppliance Maintenance Component Description Ignition Controls Temperature ControlFlow Switch IgnitorsBradford White Corp Trouble Shooting Troubleshooting the Temperature Control Troubleshooting Copper Brute ControlsCopper Brute II 500 Troubleshooting Error Codes Replacement Parts Parts ListSee 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
Related manuals
Manual 44 pages 23.82 Kb
Top Page Image Contents