Operation; Display Settings - Weil-McLain BCP-3 Installation & Operating Instructions Manual

DISPLAY SETTINGS

Calculated water temperature
Center button pressed once
• This is the water temperature the BCP-3 will stage units to hold. It is based on outdoor temperature and the Fine Tune and Reset
Ratio values (described in the following sections).
• The Calculated water temperature can not be less than the Minimum Water temperature setting (see opposite page).
• If either sensor is reading a fault condition, all stages will immediately turn on. The Calculated display will show ON to indicate
this condition.
• If the outdoor temperature is above the Outdoor Starter setting, the BCP-3 will not activate stages. The Calculated display will
show OFF to indicate this condition.
• The BCP-3 will either add stages, subtract stages, or maintain the same number of stages to hold the system temperature around
the Calculated temperature.
• The Calculated temperature is the average temperature the BCP-3 will maintain. The system can be expected to fluctuate above
and below this temperature. The size of the fluctuation depends on the number of stages, the size of each stage, the system load,
and the Reaction Time.
• The Calculated temperature is based on all the settings described above. The temperature value can not be changed by pressing
the UP or DOWN button while it is displayed.
Fine Tune Default is 0°
Center button pressed three times
• The Fine Tune value moves the starting point of the Reset Ratio curves (see charts on the next page).
• Therefore, any change made to the Fine Tune will immediately change the value of the Calculated water temperature by the same
amount.
• For example, if the Calculated water temperature were 150°F based on the specific outdoor temperature and Reset Ratio, then
increasing the Fine Tune from 0°F to 10°F would increase the Calculated water temperature to 160°F.
Press SELECT
DISPLAY
Button
*
Once
Computed
*
Twice
Outdoor Temp
3 Times
Fine Tune
4 Times
5 Times
Reset Ratio
6 Times
Reaction Time
*
7 Times
* These values can not be adjusted

OPERATION

DISPLAY CHART AND ADJUSTMENTS
Press and hold either the UP or DOWN button to adjust the value
This is the water temperature the BCP-3 will control boilers to hold. It is based on
the outdoor temperature, reset ratio, and the fine tune value. If ON is shown, there
The Fine Tune moves the reset curves vertically up or down. For example,
changing the offset from 0 to -10 will decrease the water temperature 10°
regardless of outdoor temperature or the reset curve selected. The Fine Tune is
When the outdoor temperature falls below the Outdoor Starter setting, the BCP-3 will
give heat. When the outdoor temperature is above the Outdoor Starter, the
Outdoor
Calculated value will be OFF and no stages will be activated. The Outdoor Starter
Starter
The Reset Ratio controls the amount of heat which enters the heating system based
on the outdoor temperature. A higher numbered Reset Ratio will result in a higher
Calculated water temperature. See the chart on the first page for the reset curves.
The Reaction Time controls the minimum run time for a stage. It is adjustable from
The BCP-3 returns to the default display of actual system water temperature.
Default
is a sensor fault. If OFF is shown, there is no call for heat.
This is the outdoor sensor temperature value.
adjustable from -40 to 40°F.
is adjustable from 40 to 100°F
The Reset Ratio is adjustable from 1 to 12.
half a minute (0.5) to 8.0 minutes.
5