8
BSC Installation and Operation Manual
WIRING THE SYSTEM PROVE
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there is a call for heat, the System Output relay activates the system pump. When the pump
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SYSTEM PROVE
input terminals. Only then, can the
BSC activate and modulate the boilers as required to hold the set point.
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SYSTEM PROVE
input is open on a call, the BSC will enable only the System Output. All Stage outputs will be off when the
SYSTEM PROVE
input is open.
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SYSTEM PROVE
terminals.
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SYSTEM PROVE - A9
,
A10
.
WARNING
Do not remove the factory installed System Prove jumper unless it is replaced by a System Prove signal. If the
SYSTEM PROVE
input is not closed/shorted, the BSC will NOT activate the stages.
The
SYSTEM PROVE
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safety controls as required by code.
WIRING THE LOCKOUT INPUTS
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across the pair of
LOCKOUT INPUT
terminals informs the BSC that the boiler stages have
encountered a safety limit and cannot be restarted.
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when encountering a safety limit.
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LOCKOUT INPUT
terminals is provided for each stage.
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STAGE
terminals.
WARNING
The
LOCKOUT INPUTS
cannot be used as safety limits. All equipment must
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WIRING A SETBACK
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13.
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night or on the weekends when a building is unoccupied, but a minimum level of heat is still required.
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EMS
terminals
(+)
and
(SIGNAL)
.
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EMS (+)
and
SIGNAL
terminals.
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Setback terminals
are shorted, the Setback is enabled and the BSC will hold the lower Set Point. The lower Set Point will
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ALERT
The Setback is not equivalent to the 4-20mA input, even though both wire into the
EMS terminals. The 4-20mA input requires 4-20mA source that changes the Set
Point in one degree increments. The Setback provides lower Set Point.
STAGE
A
STAGE
B
B1
B2
B3
B4
LOCKOUT
INPUTS
STAGE
C
STAGE
D
B5
B6
B7
B8
B Lockout Signal
Dry Contact
EMS INPUT
+
SIGNAL
SHIELD
Dry Contact
Setback Signal
OUTDOOR
TEMP
SYSTEM
PROVE
A7
A8
A9
A10
A11
NETWORK
T
Prove Signal
Dry Contact