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User Manual - Page 7

For BOILER SEQUENCING CONTROL.

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7
BSC Installation and Operation Manual
WIRING THE SYSTEM SENSOR
For proper operation, the BSC must be connected to a temperature or pressure sensor located in the common header.
SYSTEM TEMPERATURE
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stages before any takeoffs. If the sensor cannot read the output of all the stages, it will not be able to control the system properly.
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 &RQQHFWWKHVKLHOGWRWKHFLUFOHGWHUPLQDOTEMP-A2 with one of the sensor wires.
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SYSTEM PRESSURE
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See Sensor Type selection on page 13.
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of all the stages. If the sensor can not read the output of all the stages, it will
not be able to control the stages properly.
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 35(6685(6(16256+$9(32/$5,7<&XWWKH*UHHQZLUH:KLWHZLUHDQGWKHFOHDUWXEH2QO\WKH5HGDQG%ODFNZLUHV
should be connected.
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WIRING AN EXTERNAL SET POINT (4-20MA INPUT)
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System (EMS) or any other signal source.
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Point in the Startup menu on page 13). These settings will allow the BSC to read the
4-20mA input signal and adjust the set point based on its external set point setting.
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BSC EMS terminal marked +. Attach the (-) side of the 4-20mA signal to the EMS terminal
marked SIGNAL.
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4-20mA input to the BSC EMS terminal marked SIGNAL. Attach the (-) side of the 4-20mA
input to the EMS terminal marked SHIELD.
WIRING THE SHUTDOWN
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remain in low for the Soft-Off period (See Soft-Off Delay on page 27) and then, turn off.
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over, then it will also turn off.
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SHUTDOWN terminals.
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A1
A2
A3
SHUTDOWN
SYSTEM
TEMP
T
SHIELD
SYSTEM SENSOR
Current Modulation Outputs in series with
+
EMS Sourcing Current
EMS INPUT
EMS
Input
+
SIGNAL
SHIELD
(+)
(-)
EMS INPUT
BSC Sources Current
24VDC Excitation Voltage
EMS
Input
+
SIGNAL
SHIELD
(+)
(-)
A3
A4
A5
A6
A7
A8
NETWORK
PRESS
4-20mA
SHUTDOWN
S
+
BLACK
Transducer
4-20mA
RED
A1
A2
A3
A4
SHUTDOWN
SYSTEM
TEMP
T
Shutdown Sign
al
Dry Contact
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