Operating instructions

12
OPERATION
OUTDOOR RESET DISPLAY SETTINGS (WATER)
CALCULATED
Select button pressed ONCE
• This is the water temperature the BCP-6/12 will stage units to hold. It is based on outdoor temperature and the Fine Tune and
Reset Ratio values (described below and on the following page).
• The Calculated water temperature can not be less than the minimum water temperature setting (see pg. 9).
• If either sensor is reading a fault condition, all stages will immediately turn on. The calculated water temperature display will
show ON to indicate this condition.
• If the outdoor temperature is above the Outdoor Starter, the BCP-6/12 will not activate stages. The calculated display will show
OFF to indicate this condition.
• A DHW call (see pg. 17) will override the Outdoor Starter. During a DHW call, the calculated temperature will be 200°F.
• The BCP-6/12 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-6/12 will maintain. The system can be expected to fluctuate above
and below the Calculated 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 parameters described above. The Calculated value can not be changed by
pressing the UP or DOWN button while it is displayed.
FINE TUNE DEFAULT is 0°
With a -20° Fine
Tune, the ratio
curves begin at
80° Water
Temperature.
Outdoor Temperature
Water Temperature
70 405060
130
120
110
100
1:3
4:1
1:1
Outdoor Temperature
Water Temperature
70 405060
110
100
90
80
1:3
4:1
1:1
Outdoor Temperature
Water Temperature
70 405060
150
140
130
120
1:3
4:1
1:1
With a 0° Fine
Tune, the ratio
curves begin at
100° Water
Temperature.
With a +20° Fine
Tune, the ratio
curves begin at
120° Water
Temperature.
Select button pressed 3 Times
• The Fine Tune value moves the starting point of the Reset Ratio curves (see
charts on the right).
• 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.
• In a new installation, start with a Fine Tune value of 0°.
• Adjust the Fine Tune value in mild weather. If the ambient indoor temperatures
are warm in the warm weather, decrease the Fine Tune. If the ambient building
temperatures are cold in the mild weather, increase the Fine Tune.
• The rule of thumb for baseboard radiation is to change the Fine Tune by 4° for
every degree you wish to change the building temperatures. For radiant heat
applications, change the Fine Tune by 1° or 2° for every degree you wish to
change the building temperature.
• The Fine Tune can be set from -40 to 40°F.
OUTDOOR STARTER DEFAULT is OFF
Select button pressed 4 Times
• The Outdoor Starter sets at what outdoor temperature 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.
• 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.