Operating instructions

14
SET POINT DISPLAY SETTINGS (WATER or STEAM)
SET POINT
Select button pressed ONCE
• The Set Point is the temperature or pressure value the BCP-6/12 will use to control the system.
• The BCP-6/12 will either add stages, subtract stages, or maintain the same number of stages to hold the system temperature or
pressure around the Set Point.
• The Set Point is the average temperature or pressure the BCP-6/12 will maintain. The system can be expected to fluctuate above
and below the Set Point. The size of the fluctuation depends on the number of stages, the size of each stage, the system load,
and the Reaction Time (below).
• If it is a temperature system and the External Set Point is being used, the Set Point will vary with the 4-20mA input (see pg. 16). In
this case, the Set Point can not be adjusted by using the buttons.
OUTDOOR STARTER DEFAULT is OFF
Select button pressed 3 Times
• The Outdoor Starter sets the temperature at which the BCP-6/12 will begin heating.
• When the outdoor temperature is above the Outdoor Starter temperature, the BCP-6/12 will not activate stages unless there is a
DHW call. The Calculated water temperature will read OFF.
• The Outdoor Starter has a built in 2°F differential.
• When the outdoor temperature drops below the Outdoor Starter temperature minus the 2°F differential, the BCP-6/12 will compute
the Calculated water temperature and sequence stages to hold that temperature as long as there is a call for Heat Demand.
• If the building is too cold before the system starts, raise the outdoor starter temperature.
• The Outdoor Starter temperature can be set from 40 to 100°F.
REACTION TIME DEFAULT is 2.0
Select button pressed 4 Times
• The Reaction Time controls the minimum run time for any stage.
• When a stage has been added, that stage can not be turned off until at least half the Reaction Time has elapsed.
• The Reaction Time must be at least as long as the time it takes for a newly activated stage to start affecting the system. If the
Reaction Time is shorter than this, the BCP-6/12 may activate additional stages before it can see the impact of each stage. (Note
that it is not necessary to include the purge cycle time for a new stage, as that is set on the Purge Time which is described below).
• For cast iron boilers, it is recommended to start with a Reaction Time of 5.0 minutes.
• If the system tends to fluctuate rapidly above and below the Set Point, the Reaction Time may be set too short.
• If the system tends to remain always below the Set Point, the Reaction Time may be set too long.
• When making a change to the Reaction Time, wait at least 5 reaction times before making another change. The system will need
time to settle out.
• The Reaction Time can be set from half a minute (0.5) to eight minutes (8.0).
SYSTEM DELAY DEFAULT is 10
Select button pressed 5 Times
• If the SYSTEM output is configured for Combustion Air Damper operation, the SYSTEM output will be active when any OUTPUT
is active.
• If the SYSTEM output is configured for System Pump operation, the SYSTEM output will be active when the outdoor temperature
is below the outdoor starter and there is a call for Heat Demand (and there is no call for DHW with Domestic Priority).
• Whenever the BCP-6/12 determines the SYSTEM output needs to be disabled, the SYSTEM output will remain energized for the
period of time set by the System Delay.
• The System Delay can be set from 0 to 30 minutes.