Weil-McLain BCP-3 manual Output Mode Table, Wiring the Boiler Output

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
1-On/Off+2-Pump	One On/Off boiler, a System pump and	Sys Pump	Boiler	DHW
	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 and a System pump	Sys Pump	Boiler Lo	Boiler Hi	controlled by DHW
					Aquastat
					Sys Pump controlled
3-On/Off	Three On/Off boilers and NO pumps	Boiler 1	Boiler 2	Boiler 3	using other controls
					or run constantly.

Wiring the Boiler Output

Single-Stage (On/Off) Boiler Wiring

•If any of the "1-On/Off" Output Modes is selected, wire the two Blue wires to the boiler circuit.

•If more than one On/Off boiler is to be controlled by the BCP-3, follow the wiring colors as per the Output Mode Table above.

•The BCP-3 does not source any output power to the boiler. The relay makes when energized.

Two-Stage (Lo/Hi) Boiler wiring

•Wire the two Blue wires to the boiler control circuit initiating the Low Fire signal.

•Then, wire the two White wires to the High fire circuit.

• The BCP-3 does not source any output power to the boiler. The relay makes when energized.

On/Off Boiler Output Wiring

Blue

Two-Stage Boiler Output Wiring

Blue (Lo Fire)

White (Hi Fire)

Wiring the System and DHW Pump Outputs

System Pump Wiring (Not Available With "3-On/Off" Output Mode)

•The BCP-3 will control the System Pump relay (Maximum of 1/8 HP) in all Output Modes except (3-On/Off), as all outputs will be used by boiler stages. In this scenario, the system pump can be controlled independently using a switch or left to run constantly.

• Wire the two Yellow wires to the System Pump circuit.

• The BCP-3 does not source any output power to the pump. The relay makes when energized to switch the power to the pump on.

DHW Pump Wiring (Available Only With "1-On/Off+2-Pumps" Output Mode)

•The BCP-3 will control the DHW Pump relay (Maximum of 1/8 HP) only in (1-On/Off+2-Pump) Output Mode. In the other modes, the DHW pump can be controlled using an external DHW aquastat.

•If the BCP-3 is controlling the DHW pump, wire the two White wires to the DHW Pump circuit.

• The BCP-3 does not source any output power to the pump. The relay makes when energized to switch the power to the pump on.

System Pump Output Wiring

YELLOW

L N

120VAC

DHW Pump

Output Wiring

WHITE

L N

120VAC

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