Weil-McLain BCP-8S Operations Instructions download pdf (Page 16)

4-20mA Input Set Point

4 110°F

6 122°F

8 135°F

10 147°F

12 160°F

14 172°F

16 185°F

18 197°F

20 210°F

OUTPUT CONTROLS

MANUAL OVERRIDES

• Each OUTPUT and the SYSTEM has an OFF/AUTO/ON switch.

• The BCP-6/12 only controls units which are switched to AUTO.

• In lo/hi applications, if any stage of the multistage unit is not switched to AUTO, then the whole unit will not be considered in the

normal sequencing.

• If an output is switched ON, then the output relay will always be energized. Any stage will run on its own limits. This switch

position can be used for testing individual outputs.

• If an output is switched OFF, then the output relay will not energize. Any output without an output relay must be switched to

OFF. Also, if an output needs maintenance or is not working properly, it can be switched to the OFF position.

OUTPUT LIGHTS

• The row of red lights marked ACTIVE indicate which outputs are energized.

• If the red light next to an output is on, the output relay should be energized and the output contacts should be closed.

• If the red light next to an output is off, the output relay should not be energized and the output contacts should be open.

OPTIONAL EXTERNAL SET POINT

(Water Temperature Set Point Controls ONLY)

INSTALLATION

• Can only be used when the BCP-6/12 is regulating temperature to hold a constant

set point. Dip switch 6 and 8 must be OFF and dip switch 7 must be ON.

• The BCP-6/12 can then take a 4-20mA signal from an Energy Management System

(EMS) or other signal source to change the set point remotely.

• The signal must be a two-wire 4-20mA.

• Connect the system water temperature sensor as described on pg. 4.

• The BCP-6/12 can source the current for the 4-20mA input. It provides an excitation

voltage of 24VDC. If using the BCP-6/12 to source the power, attach the (+) side of

the 4-20mA input to the input terminal marked 4 +. Attach the (-) side of the 4-20mA

signal to the input terminal marked 5 SENSOR.

• If the EMS or other signal sources the current (provides the excitation voltage),

attach the (+) side of the 4-20mA input to the input terminal marked 5 SENSOR.

Attach the (-) side of the 4-20mA input to the input terminal marked 6 COM.

OPERATION

• A typical use for this option would be to allow an EMS to automatically change the

Set Point of the BCP-6/12 to provide an outdoor air reset function for hot water heat.

• If the EMS provides a 4mA signal to the BCP-6/12, the BCP-6/12 Set Point will be

110°F.

• If the EMS provides a 20mA signal to the BCP-6/12, the BCP-6/12 Set Point will be

210°F.

• The Set Point range is linear between these two point as shown on the chart at the

right.

• When using this option, the Set Point can only be changed by changing the 4-20mA

input. The Set Point display will be shown normally (see pg. 11), but it can not be

changed by pushing the buttons.

• To disable the BCP-6/12 from the external source, send out a 0mA signal. The Set

Point display will show OFF, and all active stages will immediately be turned off.

NOTE: The Set Point will read OFF whenever the 4-20mA signal falls below 3.9mA or

rises above 20.1mA.

BCP-6/12 Sources Current

24VDC Excitation Voltage

(+)

(-)

Input

Signal

EMS Sourcing Current

(+)

(-)

Input

Signal

Sensor Com

PRESSURE

4-20mA

Sensor Com

PRESSURE

4-20mA

1 2 ... 11 12 13 14 15 16 17 18 19 20

Comments to this Manuals

No comments

Weil-McLain BCP-8S Operations Instructions Page 16

Comments to this Manuals

Related products and manuals for Water heaters & boilers Weil-McLain BCP-8S