Operating instructions

13
RESET RATIO DEFAULT is 7
Select button pressed 5 Times
• The Reset Ratio controls how much heat will be added based on outdoor tempera-
ture. The Reset Ratios are shown as Outdoor Temperature:Water Temperature.
• A 1:1 Reset Ratio signifies for each degree it gets colder outside, the Calculated
water temperature will raise 1 degree.
• The other Reset Ratios available are shown on the right.
• The Reset Ratio curves start at 70°F. At 70°F the BCP-6/12 will require 100°F water.
Note that this is not the point where the BCP-6/12 will begin giving heat. That point
is determined by the Outdoor Starter. Also note that this starting point can be
changed by adjusting the Fine Tune as shown on the previous page.
• For new installations with standard baseboard heating, begin with a Reset Ratio
curve of 7.
• For new installations with radiant heat, begin with a Reset Ratio curve of 4 or 5.
• Adjust the Reset Ratio value in cold weather. If the ambient indoor temperatures
are cold in the cold weather, pick the next higher Reset Ratio (that is, go from 7 to 8).
If the ambient building temperatures are warm in the cold weather, pick the next
lower Reset Ratio.
• After adjusting the Reset Ratio curve, wait at least 24 hours before making another
adjustment.
• The Reset Ratio can be set from 1 to 12.
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
Water Temperature (in °F)
100
120
110
130
140
150
160
180
170
190
200
210
220
12 11 10 9
8
7
6
4
3
2
5
1
1:4 1:3 1:2 1:1.5
1:1.25
1:1
1.25:1
1.5:1
2:1
3:1
4:1
8:1
REACTION TIME DEFAULT is 2.0
Select button pressed 6 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 temperature tends to fluctuate rapidly above and below the Calculated water temperature, the Reaction Time may be
set too short.
• If the system temperature tends to remain always below the Calculated water temperature, 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 7 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.
PURGE TIME DEFAULT is 0
Select button pressed 8 Times
• Many units must go through a purge cycle before they are brought on line and begin heating.
• The Purge Time should be set to the time of the unit’s purge cycle.
• The Purge Time applies to every stage with ON/OFF units.
• The Purge Time applies only to the Lo stages of multiple stage units.
• When an ON/OFF stage, or a Lo stage, is turned on, the BCP-6/12 will begin counting down the Purge Time. When the Purge
Time has elapsed, then the BCP-6/12 will begin counting down the Reaction Time. Therefore, if the Purge Time applies to a
particular stage, the minimum run time of that stage is the Purge Time plus half a Reaction Time.
• The Purge Time can be set from 0 minutes (0.0) to 10 minutes (10.0).
The BCP-6/12 will not generate a
Calculated water temperature below
the minimum water temperature
setting.
C A U T I O N