Weil-McLain BCP-3 - Manual (Page 15)

15
BCP-3 Installation and Operation Manual
Boiler1
DHW
Indirect
Building
Heat
System
Sensor
Outdoor
Sensor
T1 T2 COM COM T3+ T3- EXT+ EXT
-
P+ P- COM 24V
AC
} System Sensor } Outdoor Sensor } DHW Call Dry Contact } Enable Dry Contact } Setback Dry Contact
Boiler SYS Pump DHW
Pump
SET SET
SYSTEM = 147F
TARGET = 150F
Y
ellow W
ires (Output 1)
Blue W
ires (Output 2)
Boiler2 Boiler3
System
Pump
White W
ires
(Output 3)
DHW
Pump
Boiler
DHW
Indirect
Building
Heat
System
Pump
System
Sensor
Outdoor
Sensor
T1 T2 COM COM T3+ T3- EXT+ EXT
-
P+ P- COM 24V
AC
} System Sensor } Outdoor Sensor } DHW Call Dry Contact } Enable Dry Contact } Setback Dry Contact
Boiler SYS
Pump
DHW
Pump
SET SET
SYSTEM = 147F
TARGET = 150F
DHW Pump
Y
ellow W
ires
(Output 1)
Blue W
ires
(Output 2)
White W
ires
(Output 3)
Piping 1 On/Off Boiler +
System Pump + DHW Pump
Piping 3 On/Off Boilers
Aquastat
Aquastat
BCP-3
BCP-3
Output 1 Output 2 Output 3
Output 1 Output 2 Output 3
BCP-3 Plumbing Diagrams
NOTES:
• The BCP-3 does not source any output power to any of its
relays. A power source must supply pumps with power and
the control can break the hot leg.
• Weil McLain recommends using a separate power source
to the control from any pumps, boilers, heavy electric
equipment.
• When wiring a sensor to the BCP-3, connect the Shield to
the COM terminal on the BCP-3 end. DO NOT connect
the Shield at the sensor end.
• Weil McLain is aware that each installation is unique.
Thus, any wiring or piping diagrams in this document
are to represent control operation concept only.