Weil-McLain BCP-3 Installation And Operation Instructions Manual page 11

Minimum Target (Available when Startup Control Mode = Outdoor Reset)
Options: From 70ºF/21ºC to 170ºF/77ºC
/Set Point/<Out. Reset>/Min. Tgt
SET SET
• The Minimum Target Temperature must be set to the boiler manufacturer's specification.
The BCP-3 will calculate the Target based on the Outdoor temperature, the Reset Ratio, and the Offset value. The BCP-3 will
control the boiler to hold the higher of either the calculated temperature or the Minimum Target Temperature.
• The Minimum Target Temperature must be at least 20°F lower than the Maximum Temperature (See next setting).
Maximum Target (Available when Startup Control Mode = Outdoor Reset)
Options: From 90ºF/38ºC to 240ºF/116ºC
/Set Point/<Out. Reset>/Max. Tgt
SET SET
• This is the highest Target Temperature the BCP-3 will circulate through the heating system.
• When using a radiation system, it should be set according to the tubing or floor manufacturer's specification.
• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature.
Stage Menu Options
/<Settings>/<Stage>
This menu is only available when multiple stages or multiple
boilers are selected as the Output Mode from the Startup Menu.
Reaction Time
Options: 1 to 10 minutes
/<Settings>/<Stage>/Reaction
SET SET
• It is the amount of time it takes a single stage to affect the system.
• After the BCP-3 turns on a stage trying to meet a set point, it will not turn on another stage until
the reaction time has elapsed. Then, it will recalculate if an additional stage is need.
• To determine the optimum time, in a heating system start with a hot system. Then, turn on a
single stage and calculate how long it takes until the system begins to respond to that stage by
rising an additional 2°F. That period should be set as the Reaction Time.
Purge
Options: 0.0 to 10 minutes
/<Settings>/<Stage>/Purge
SET SET
• Most large units must go through a purge cycle before they are brought on line.
• When the BCP-3 activates a unit (the lowest firing stage on a boiler), it does not start to calculate
its output until the Purge Delay is over. This allows the boiler to fully come on and begin
producing output.
• The Purge Delay helps prevent short cycling of newly activated boilers. Once the lowest boiler
stage is activated, it MUST run through the entire Purge Delay period before starting the Reaction
Time calculation..
• The Purge Delay setting MUST be set to the time required by the boiler's manufacturer
specification.
BCP-3 Installation and Operation Manual
--STAGE SETTINGS-
Reaction
Purge
Min. Runtime
Lead
Rotate
<Back>
Rotation Period:
24hrs
Default: 140ºF/60ºC
Default: 200ºF/93ºC
2m
0.0m
2m
Output 1
Time
Default: 2 minutes
Default: 1.0 minutes
Min Target:
140 F
Max Target:
200 F
Reaction Time:
5m
Purge Delay:
1.0m
Minimum Runtime:
2m
Lead Boiler:
Output 1
Lead Rotation:
Time
Manual
Reaction Time:
2m
Purge Delay:
1.0m
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