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OUTPUT WIRING
WIRING THE SYSTEM OUTPUT
System Output Operation in Set Point Mode
SYSTEM PROVE input is shorted no Stages will be activated. If a Prove is not required, the factory-
installed jumper should remain connected.
residual heat from the boilers.
System Output Operation in Reset Mode
and then, turn off.
Wiring the System Output
WIRING THE STAGE OUTPUTS
operating limit output can be used when a boiler requires an activation signal through its limits.
case operating limit outputs are not used.
Installing the Operating Limit Output Relays
the socket for the limit output to function.
appropriate socket.
Wiring the Stage Outputs
A through D) has one Normally Open (N.O.) relay contact.
Class 2 voltage wiring.
WIRING TO 135 MODULATING MOTORS
ordered with 135 Ohm Output boards.) See Modulating Output Cards on page 10.
decreasing terminals on the burners (Blue/Black modulating wires).
increasing on the burners (White modulating wires).
common terminals on the burners (Red modulating wires).
BSC Installation and Operation Manual
A through D) that is to be used must have a relay installed in
modulating motors (BSC
NO
135 Ohm Modulation Outputs
C1
C3
A
B
R
W
135 Ohm
Motor
SYSTEM
3
SYS
L
N
Pump
A
B
C
D
5
6
7
8
9
10
11
A
B
C
D
OPERATING LIMIT
OUTPUTS
Limit Circuit
Typical for Each Stage
C5
C7
C9
C11
B
C
D
B
R
W
B
R
W
B
R
135 Ohm
135 Ohm
135 Ohm
Motor
Motor
Motor
4
12
W
9
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