Weil-McLain BCP-8S User Manual download pdf (Page 23)

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every 1.5 degree change in the Outdoor temperature. What the Offset does is add or

subtract a constant temperature value. (See Understanding Operation Concept on page 5)

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the new calculated set point based with the Offset should be 175°F. However, it will not

exceed 170°F due to the Maximum Target setting.

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temperatures are too warm in the mild weather, decrease the Target Offset. If the

ambient building temperatures are too cold in the mild weather, increase the Target

Offset. The rule of thumb for baseboard radiation is to change the Offset 4°F for every

1°F you wish to change the building temperatures. In radiant heat applications, change

the Offset 1°F or 2°F for every 1°F you wish to change the building temperature.

Outdoor Temperature (in °F)

70 60 50 40 2030 0 -1010 -2

120

140

130

150

160

170

180

100

110

Water Temperature (in °F)

Tar

et Offset

Offset=10°F

Reset Ratio=1.5 : 1.0

Reset Ratio

Max Target

Min Target

Reset Ratio + 10F Offset

Min Target=120°F

Max Target=170°F

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Hold Button: MENU/<Outdoor Reset>/Min. Target LQ2XWGRRU5HVHWRQO\

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8W will calculate the Set Point based on the Outdoor temperature, the Reset Ratio, and

the Offset value. The BCP-8W will control all boilers to hold either the Set Point

---- MIN TARGET ----

140 F

[ ]

BACK SAVE

temperature, or the Minimum Target, whichever is higher.

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Hold Button: MENU/<Outdoor Reset>/Max. Target LQ2XWGRRU5HVHWRQO\

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previous setting)..

---- MAX TARGET ----

200 F

[ ]

BACK SAVE

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When a return sensor is connected to the BCP-8W, it will monitor and control the boiler return. It does that by monitoring the Target

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return will occur, it will increase the Target automatically as an effort to increase the return temperature. See Return Sensor Wiring on

page 10.

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Hold Button: MENU/Min. Return

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Normally, this setting is provided by the boiler manufacturer or the system engineer.

---- MIN RETURN ----

OFF

[ ]

BACK SAVE

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drop below the Min. Return. During that period, it will display "Hold Return at 120 F" in the Display Message

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Minimum Return to allow the monitoring of the return on the display without sequencing the boiler stages.

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Weil-McLain BCP-8S User Manual Page 23

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