Mounting the Controller, Wiring | Weil-McLain BCP-3 specs

BCP-3 Installation and Operation Manual

Mounting the Controller

Base Section

Display Section

Base Mounting Holes

• 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 Section away from the base starting
with the bottom will unplug it from the Base section.
• Proceed with the power and output wiring instructions.	T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
• Use the screws provided to mount the BCP-3 to the
1900 box or the extension skirt.	Input Terminals 24VAC optional power input	Display Cover Mounting Screws
• Mount Display Section back to the Base Section.
Tighten the Display Cover Mounting Screws.		120VAC Power Wiring
		120VAC Power Wiring

	WARNING
	The BCP-3 can accept only one source of power:	BLACK
Wiring	120VAC or 24VAC. If more than one power source is	120VAC Power Source
	applied, the unit may be damaged.
	applied, the unit may be damaged.	BLACK

Wiring Power Input

The BCP-3 is designed to accept ONLY A SINGLE POWER SOURCE. It can be wired to

either 120VAC using the two Black wires or 24VAC using the right most two terminals on the Input Terminals terminal block on bottom of the control. Weil McLain recommends the installation of a Surge

Suppressor and a Power Switch before the Power Line connection for safety and ease of service.

T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC

120VAC

•Attach line voltage, 120VAC, to the two Black wires extending from the back of the BCP-3. Remember to use the power line from a different source than the equipment being controlled.

24VAC

•Use a dedicated transformer with at least a 5VA output.

•Bring 24VAC to the two right most terminals on the front of the BCP-3 marked 24VAC and COM.

System Sensors {

Outdoor Sensor {

DHW Input Dry-Contact {

Enable/Disbale Input Dry-Contact {

Setback Input Dry-Contact {

24VAC power Input {

24VAC Power Wiring

Wiring Input Terminals

Heating System Sensor (HSS) Installation (T1, COM)

Locating HSS

•Place the Heating System sensor in the common header where it will register the output of the boilers before any takeoffs.

•Only use the Standard Brass Tube sensor provided.

•The sensor wires can be extended up to 500' using a shielded 2-conductor cable (Belden #8760 or equivalent (#18/2)).

•Cut the shield and do not connect it at the sensor end. Only connect it at the control end using the outdoor terminal marked COM. Do not ground the shield at the sensor but at the control using the COM terminal.

•Do not run sensor wires in conduit with line voltage wiring.

EXT+ EXT-

P+

P- COM 24VAC

Comm

24VAC

24VAC Power Source

Sensor Wiring

T1 COM

T2 COM T3+

Immersion Heating System Sensor (HSS) Installation

•Install a 3/8"ID x 1/2"NPT immersion well.

•Insert the supplied sensor probe into the well.

Shield	Shield
	Outdoor Sensor

Strap-On Heating System Sensor (HSS) Installation

•Strap the sensor to the pipe using a metal clamps. Do not over tighten the clamp.

•Strap pipe insulation around the sensor and the pipe.

System Temp