Weil-McLain BCP-3 - Manual (Page 5)

5
BCP-3 Installation and Operation Manual
Output Mode Table
Output Mode Description
Output 1
(Yellow
Wires)
Output 2
(Blue
Wires)
Output 3
(White
Wires) Notes
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
a Domestic Hot Water Pump
Sys Pump Boiler
DHW
Pump
2-On/Off+1-Pump Two On/Off boilers and a System pump Sys Pump Boiler 1 Boiler 2
DHW Pump
controlled by DHW
Aquastat
1-Lo/Hi+1-Pump One Lo/Hi boiler and a System pump Sys Pump Boiler Lo Boiler Hi
DHW Pump
controlled by DHW
Aquastat
3-On/Off Three On/Off boilers and NO pumps Boiler 1 Boiler 2 Boiler 3
Sys Pump controlled
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.
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.
On/Off Boiler
Output Wiring
Blue
YELLOW
System Pump
Output Wiring
L N
120VAC
Two-Stage Boiler
Output Wiring
Blue (Lo Fire)
White (Hi Fire)
WHITE
DHW Pump
Output Wiring
L N
120VAC