Weil-McLain BCP-3 - Manual
Weil-McLain BCP-3 – Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Table of Contents:
- Page 2 – BCP-3 Installation and Operation Manual; Type of Radiation in Building; Operation Concept; Boiler Operation; F or the Maximum Water temperature Setting.; Reset Ratio Curves
- Page 3 – Wiring Power Input; ONLY A SINGLE POWER SOURCE; Wiring Input Terminals; Locating HSS; WARNING; 4VAC Power Wiring; Input Terminals
- Page 4 – IMPORTANT; Wiring Outputs; Wire Colors and Output Lights; Wiring; DHW Call; Output 1 Output 2 Output 3
- Page 5 – Output Mode Table; Then, wire the two White wires to the High fire circuit.; Wiring the System and DHW Pump Outputs; Wire the two Yellow wires to the System Pump circuit.; System Pump; DHW Pump
- Page 6 – BCP-3 Output Modes Wiring
- Page 7 – Startup Menu; Menus; Default Screen
- Page 8 – Display Unit; Control Mode; Outdoor Reset, Set Point; Output Mode; Sensor Fault; Output On, Output Off; OFF
- Page 9 – Outdoor Reset Mode; Setting the Control to Factory Default; Default Display; Operating Menu Options (Click SET Button); Outdoor Reset (Available when Startup Control Mode = Outdoor Reset)
- Page 10 – Adjust the RESET RATIO in cold weather.; Custom Reset Ratio; Custom Outdoor Reset Curve; Custom; Adjust the Water Offset in mild weather; Outdoor Cutoff; in Set Point; in
- Page 11 – Stage Menu Options; Reaction Time; Purge
- Page 12 – Minimum Runtime; This is the minimum amount of time any stage will run.; Lead Rotation Options:; Manual or Time; Rotation Period Options:; Single On/Off Boiler and System Pump Settings; From 1; oC; From 0 min to 60 min
- Page 13 – NO and From 1 min to 120 min; Setback; From 0; Boost; System and Outdoor Trim
- Page 14 – then, check the EXT terminals. If the EXT terminals are not; Temperature Sensor Chart
- Page 15 – Boiler1; Boiler2; System Pump + DHW Pump; BCP-3 Plumbing Diagrams
- Page 16 – Specifications; Operating Temperature:
INSTALLATION AND OPERATION INSTRUCTIONS
BCP-3
Hydronic Multi-Stage Boiler Control
Blue (Output 2)
White (Output 3)
Yellow (Output 1)
Boiler
SYS
Pump
DHW
Pump
SET
SET
SYSTEM =
147F
TARGET =
150F
Output 1
2 Line Alphanumeric Display
Displays sensor values and
menu settings
Output Lights indicate
output status
Display Section Locking Screws
Black (120VAC power)
BCP-3
Output 2 Output 3
This Weil McLain control is strictly an operating control; it should never be used as a
primary limit or safety control. All equipment must have its own certified limit and safety
controls required by local codes. The installer must verify proper operation and correct any
safety problems prior to the installation of this Weil McLain control.
Hot Water Control with
Outdoor Reset, Set
Point, and DHW for
Hydronic Applications
The BCP-3 is a multi-boiler or multi-stage outdoor reset
hydronic heating control. It establishes ambient comfort by
varying the temperature of the heating system’s circulating
hot water in response to changes in the outdoor temperature.
In addition, it provides an outdoor temperature based cutoff,
heating system pump control, and domestic hot water (DHW)
pump control. Two unique features have been added to this
control including a customized reset ratio curve. A Set Point
option was added for applications where outdoor reset will not
apply.
Two sensors are used, one to monitor the outdoor temperature
and one to monitor the circulating hot water temperature in
the heating system. When the outdoor temperature falls below
the outdoor cutoff setting, the heating system is activated
and the target water temperature is increased proportionally
to satisfy the load. Should it get warmer outdoors, the target
water temperature is automatically lowered by the control. If
the outdoor temperature continues to rise to the outdoor cutoff
setting then the heating system is turned off.
Because of the many different physical characteristics of
buildings including the type of radiation; i.e., baseboard or
radiant, the heat loss varies. In one building, a 1-degree
outdoors temperature change may require a change of 1 degree
in heating water temperature; for another it may require a
change of 2, 3, or even 4 degrees in order to gain the desired
comfort level. This is known as the Reset Ratio. The Reset
Ratio chart shows the wide range of Reset Ratios available for
the BCP-3 in addition to the customized reset ratio. See page 2.
The installer fits the BCP-3 to a specific building by adjusting
the Reset Ratio curve. With curve number 4 (2:1 reset ratio)
a 2-degree change in outdoor temperature will change the
circulating hot water temperature by 1 degree; at curve number
11(1:3 reset ratio) an outdoor change of 1 degree will change
the water temperature by 3 degrees. Most buildings with
baseboard radiation require a curve of 6, 7, or 8. Radiant heat
applications usually require a lower curve. An external T-Stat
input can be used to shut the heating system down when the
WARNING
Part Number 550-110-070/0308
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Summary
2 BCP-3 Installation and Operation Manual thermostat is satisfied. Another, is a Setback input that will switch the heating system to a lower set point determined by the Set Back setting. Type of Radiation in Building Reset Ratio Offset Radiators (Steel & Cast Iron) 1.00 (O) : 1.00 (S) 0˚F Basebo...
3 BCP-3 Installation and Operation Manual Mounting the Controller • The BCP-3 is designed to mount on a 1900 (4”x4”) deep electrical box. • If additional room is needed for wiring use the extension skirt provided. • Place the BCP-3 in an indoor convenient location near the unit to be controlled and ...
4 BCP-3 Installation and Operation Manual IMPORTANT Determining the proper location for the Outdoor Sensor is very important. The BCP-3 will base the heat on the outdoor temperature information it receives from this location. If the sensor is in the sun, or covered with ice, its reading will be diff...
