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BCP-3
Hydronic Multi-Stage Boiler Control
INSTALLATION AND OPERATION INSTRUCTIONS
The BCP-3 is a multi-boiler or multi-stage outdoor reset
Hot Water Control with
hydronic heating control. It establishes ambient comfort by
varying the temperature of the heating system’s circulating
Outdoor Reset, Set
hot water in response to changes in the outdoor temperature.
In addition, it provides an outdoor temperature based cutoff,
Point, and DHW for heating system pump control, and domestic hot wat
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BCP-3 Installation and Operation Manual thermostat is satisfied. Another, is a Setback input that will switch the heating system to a lower set point determined by the Set Back setting. 1:4 1:3 1:2 1:1.5 12 11 10 9 Type of Radiation in Building Reset Ratio Offset 220 1:1.25 Radiators (Steel & Cast Iron) 1.00 (O) : 1.00 (S) 0˚F 8 210 200 Baseboard (Finned copper tube& Cast Iron) 1.00 (O) : 1.00 (S) 0˚F 190 Radiant (High Mass/Concrete) 4.00 (O) : 1.00 (S) -10˚F 1:1 7 180 Radiant (Low Mass/Joists)
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BCP-3 Installation and Operation Manual Base Section Display Section Base Mounting Holes Mounting the Controller • The BCP-3 is designed to mount on a 1900 (4”x4”) deep electrical box. • If additional room is needed for wiring use the extension skirt provided. • Place the BCP-3 in an indoor convenient location near the unit to be controlled and away from excessive heat or cold. • Partially unscrew the Display Cover Mounting screws. This allows for its removal. • Lifting the Display Se
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BCP-3 Installation and Operation Manual IMPORTANT Determining the proper location for the Outdoor Sensor is very important. Sensor Clip The BCP-3 will base the heat on the outdoor temperature information it Outdoor Sensor receives from this location. If the sensor is in the sun, or covered with ice, its reading will be different from the actual outdoor temperature. Outdoor Sensor Installation (T2, COM) • The Outdoor Sensor must be used when Outdoor Reset is selected as the Control Mode f
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BCP-3 Installation and Operation Manual Output Mode Table Output 1 Output 2 Output 3 Output Mode Description (Yellow (Blue (White Notes Wires) Wires) Wires) 1-On/Off+1-Pump One On/Off boiler and a System pump Sys Pump Boiler Not used One On/Off boiler, a System pump and DHW 1-On/Off+2-Pump Sys Pump Boiler a Domestic Hot Water Pump Pump DHW Pump 2-On/Off+1-Pump Two On/Off boilers and a System pump Sys Pump Boiler 1 Boiler 2 controlled by DHW Aquastat DHW Pump 1-Lo/Hi+1-Pump One Lo/Hi boiler a
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BCP-3 Installation and Operation Manual BCP-3 Output Modes Wiring L L 120 VAC 120 VAC BCP-3 BCP-3 N N Power (Black) SYSTEM = 147F SYSTEM = 147F Power (Black) TARGET = 150F TARGET = 150F SYS DHW SYS DHW Boiler Boiler Output 1 Output 2 Pump Output 3 Pump Output 1 Output 2 Pump Output 3 Pump SET SET SET SET Output capped (White/Output 3) Boiler Boiler (Blue/ (Blue/ Output 2B) output 2) L 120 VAC N System Pump L 120 VAC (Yellow/Output 1) N System Pump (Yellow/Output 1) Wiring 1 On/Off Boiler + Wir
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BCP-3 Installation and Operation Manual Menus Startup Menu Weil McLain BCP-3 Loading Default DISPLAY UNIT: V1.00 (c) 2008 Boiler Control Values... F C -OUTPUT MODE-- SENSOR FAULT: CONTROL MODE: SETUP COMPLETE! 1-On/Off+1-Pump Output On Outdoor Reset PRESS SET 1-On/Off+2-Pump Output Off Set Point 2-On/Off+1-Pump 1-Lo/Hi+1-Pump Default Screen 3-On/Off SYSTEM= 68F TARGET= 150F Cutoff: Set Point: SET SET 60F 170F Set Point Reset Ratio O/S: Operating Menu -OUTDOOR RESET-- Custom Reset Ratio 7 1(8
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BCP-3 Installation and Operation Manual Button and Navigating Menus The BCP-3 has three buttons. • The SET button function varies. When the Default Screen is displayed, pressing the SET Button views the MENU. When SE SET T in the Menus and settings, the SET Button accepts the selected entry or setting value. • When in the menus, pressing the Up and Down buttons will scroll through the menu options. They can be used to change the setting of a specific function. I.e., change the Set Poin
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BCP-3 Installation and Operation Manual Outdoor Reset Mode • When Output-On is selected, the BCP-3 will energize all boiler and system relays when the System reads SHORT or OPEN and Outdoor is below Outdoor Cutoff. Thus, all boilers will run on their limits. However, if the Outdoor sensor fails and the Outdoor reads SHORT or OPEN, the BCP-3 will change the Target Set Point to the Max Water Temperature. • When Output-Off is selected, the BCP-3 will turn all boilers Off when the System senso
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BCP-3 Installation and Operation Manual • If required: Adjust the RESET RATIO in cold weather. If the ambient building temperatures are too cold in cold weather, move the ratio to a higher selection. That is, if 1.00 (O):1.00 (S) was initially selected, change the selection to 1.00 (O):1.25 (S). If the building temperatures are too warm in cold weather, move the ratio to a lower selection. That is, if 1.00 (O):1.00 (S) was initially selected, change the selection to 1.25 (O):1.00 (S). •
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BCP-3 Installation and Operation Manual Minimum Target (Available when Startup Control Mode = Outdoor Reset) Options: From 70ºF/21ºC to 170ºF/77ºC Default: 140ºF/60ºC Min Target: SET SET /Set Point//Min. Tgt 140F • The Minimum Target Temperature must be set to the boiler manufacturer’s specification. The BCP-3 will calculate the Target based on the Outdoor temperature, the Reset Ratio, and the Offset value. The BCP-3 will control the boiler to hold the higher of either the ca
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BCP-3 Installation and Operation Manual Minimum Runtime Minimum Runtime: Options: 1 to 60 minutes Default: 2 minutes 2m SET SET ///Min. Runtime • This is the minimum amount of time any stage will run. • The Minimum Runtime for the lowest firing stage on a boiler starts after the purge cycle. • Initially, set the Min. Runtime to half the Reaction Time. • If System tends to overshoot, reduce the Min. Runtime. If boilers tend to short cycle, increase the Min. Runtime. Lead Boi
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BCP-3 Installation and Operation Manual Domestic Hot Water (DHW) Priority DHW Priority: Options: NO and From 1 min to 120 min Default: NO 60m SET SET /Settings>/DHW Prior. • The DHW Priority, with a value set to other than NO, provides the user with an adjustable DHW priority timer for the domestic hot water call. That is, initiating a DHW call will de-energize the system pump relay for the period set by the DHW Priority. However, the DHW relay, when 1-On/Off+2-Pump is selected as the Out
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BCP-3 Installation and Operation Manual Troubleshooting No Display or LED Lights Check the power to the BCP-3. The BCP-3 requires 120VAC power to the Black wires or 24VAC to the right-most terminals. Turn the power off and back on to restore the display. If unsuccessful, make sure that the control's Display Cover is securely mounted to the Base. System or Outdoor Reads OPEN or SHORT If the sensor reads Open, short the sensor input terminals. The display should read SHORT. If it doesn
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BCP-3 Installation and Operation Manual BCP-3 Plumbing Diagrams BCP-3 Outdoor SYSTEM = 147F TARGET = 150F SYS DHW Boiler Pump Pump Sensor Output 1 Output 2 Output 3 SET SET Piping 1 On/Off Boiler + System Pump + DHW Pump System Pump Building Heat System Sensor NOTES: • The BCP-3 does not source any output power to any of its Aquastat relays. A power source must supply pumps with power and the control can break the hot leg. Boiler • Weil McLain recommends using a separate power source to th
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BCP-3 Installation and Operation Manual Specifications Voltage Input: . . . . . . . 120 VAC 60 Hz(2 Black wires) /24VAC 60 Hz (24VAc terminals) (Only One Power Source) Power Consumption: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 VA Max Operating Temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 20°F to 120°F Operating Humidity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
