Operating instructions

INTERFACE MODE

• The BCP-6/12 can be connected to the BCP-4 for commercial hot water heat applications.

• The BCP-4 can directly control up to 4 output stages.

• The BCP-6/12 can be used to expand the number of output stages from 4 to 6 or 12.

• When in the Interface mode, the BCP-6/12 determines when heat is needed, how much heat is needed, and how often stages will

be added or subtracted. Therefore, if the reset control is not set up properly, the BCP-6/12 will not output correctly. Check the

I/O manual for the reset control to be sure it is set up properly to interface to the BCP-6/12.

• The BCP-6/12 gets only four pieces of information from the reset control:

Add Add the next available stage

Subtract Subtract a stage

Rotate If you have selected First On/Last Off rotation, the reset control will rotate the Lead Stage at 2 am every day. If

you have selected First On/First Off rotation, this signal will be ignored.

Reset Turns off any active stages

• When in the Interface mode, the BCP-6/12 display reads INF. The only parameter which can be set is the System Delay.

• For wiring an Interface, see pg. 6.

HEAT DEMAND

• When the HEAT DEMAND input terminals are closed, the BCP-6/12 will not energize any stages unless there is a DHW call (see

below).

• The BCP-6/12 comes equipped with a factory installed jumper across the HEAT DEMAND terminals. DO NOT remove this jumper

unless it is being replaced by a dry contact switch.

• This input would typically be provided by a thermostat. When the thermostat is satisfied, there is no need for heat. When the

thermostat requires heat, the BCP-6/12 will activate and stage the OUTPUTs to hold the required set point.

• This input can also be used as a remote stop/start for the BCP-6/12.

• When the HEAT DEMAND terminals are first opened, all active OUTPUTs will immediately turn off. However, the SYSTEM will

remain activated for the period of time set by the System Delay.

• For wiring the Heat Demand, see pg. 5.

DHW CALL (Temperature Controls ONLY)

• When the DHW terminals are closed, the BCP-6/12 Set Point immediately changes to 200°F. This will happen regardless of

outdoor temperature, the status of the Heat Demand input, or the External Set Point (if that function is being used).

• Typically the DHW input is wired to an aquastat which monitors the domestic hot water temperature. When the aquastat calls for

heat, it will close the DHW input terminals.

• If the System Output is configured for Combustion Air Damper operation, the SYSTEM relay output will be closed when any

OUTPUT is activated to hold the 200°F set point.

• If the System Output is configured for System Pump operation without DHW priority (see pg. 9) then the SYSTEM relay will be

closed whenever the outdoor temperature is below the Outdoor Starter and there is a call for Heat Demand regardless of the DHW

input status.

• If the System Output is configured for System Pump operation with DHW priority (see pg. 9) then:

- For the first hour of a DHW call, the SYSTEM relay output will be open

- After the hour had elapsed, the SYSTEM relay output will revert to its normal mode of operation (that is either on or off

depending on outdoor temperature and the status of the Heat Demand input)

• For wiring the DHW input, see pg. 5.

DO NOT remove the factory installed Heat Demand jumper without installing a Heat Demand switch.

C A U T I O N