Weil-McLain BCP-8S Operations Instructions download pdf (Page 5)

Dry Contact Heat

Demand Signal

INPUTS

sor Com Dry Contact Only

ry Contact O

HEAT

DEMAND

SURE

INPUTS

• Pressure sensors have polarity. If the sensor has a green wire, a white wire, or a

clear tube, none of those should be connected. Simply cut them off. Only the red

and black wires should be connected.

• Connect the red wire from the pressure transducer to terminal 4 +.

• Connect the black wire from the pressure transducer to terminal 5 SENSOR.

• Connect shield (when needed) to terminal 3 SHIELD.

• Pressure sensor set point range is 0 to 15 psi.

WIRING THE HEAT DEMAND

• If the HEAT DEMAND input terminals are open, the BCP-6/12 will not energize any

output stages.

• The BCP-6/12 is shipped with a jumper across the HEAT DEMAND inputs. DO NOT

remove this jumper unless you replace it with a dry contact switch which is closed

when heat is required in the system. This type of contact is usually provided by a

thermostat which activates the BCP-6/12 when it requires heat.

• When the HEAT DEMAND inputs are opened, all active stages are immediately

turned off. The SYSTEM output will remain on until the System Delay is over, then it

will also turn off.

• The Heat Demand signal must be a dry contact only. No voltage can be placed

across the HEAT DEMAND terminals.

• Bring the two wires from the dry contact to the terminals marked 7 and 8.

WIRING THE DOMESTIC HOT WATER PRIORITY

• When the Domestic Hot Water (DHW) input is enabled by closing a dry contact, the

Calculated water temperature or the Set Point will change to 200°F and the decimal

point on the left-most digit on the display will flash.

• The DHW input will take priority over the outdoor reset function or the outdoor

starter temperature. Regardless of outdoor temperature, when the DHW input is

closed, the BCP-6/12 will lead/lag the boilers to hold 200°F.

• To provide a DHW priority for a System Pump output, the following must be true:

Dip switch 1 must be set to ON

On initial power up, the domestic priority must be selected (see pg. 9)

If these two conditions are met, when the DHW inputs are closed, the SYSTEM relay

output will open, disabling the system pump and allowing the domestic tank to

satisfy quickly. If the DHW call continues for more than 1 hour, the SYSTEM output

will resume normal operation (see pg. 17 for additional details).

• The DHW signal must be a dry contact only. No voltage can be placed across the

DHW terminals. Typically this input is provided by an aquastat which controls the

DHW temperature.

• Bring the two wires from the dry contact to the terminals marked 9 and 10.

DO NOT remove the factory installed Heat Demand jumper

without installing a Heat Demand switch.

C A U T I O N

Dry Contact

DHW Signal

INPUTS

Dry Contact Only

HEAT

DEMAND

DHW

OUT

DOOR

INPUTS

1 2 3 4 5 6 7 8 9 10 ... 19 20

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Weil-McLain BCP-8S Operations Instructions Page 5

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