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BSC Installation and Operation Manual
WIRING THE SYSTEM PROVE
there is a call for heat, the System Output relay activates the system pump. When the pump
BSC activate and modulate the boilers as required to hold the set point.
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.
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
safety controls as required by code.
WIRING THE LOCKOUT INPUTS
across the pair of LOCKOUT INPUT terminals informs the BSC that the boiler stages have
encountered a safety limit and cannot be restarted.
when encountering a safety limit.
LOCKOUT INPUT terminals is provided for each stage.
The LOCKOUT INPUTS cannot be used as safety limits. All equipment must
WIRING A SETBACK
night or on the weekends when a building is unoccupied, but a minimum level of heat is still required.
Setback terminals are shorted, the Setback is enabled and the BSC will hold the lower Set Point. The lower Set Point will
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.
8
SYSTEM PROVE input terminals. Only then, can the
WARNING
STAGE terminals.
WARNING
EMS terminals (+) and (SIGNAL).
Stb= 150F
ALERT
SYSTEM PROVE terminals.
SYSTEM PROVE - A9, A10.
LOCKOUT
INPUTS
13.
EMS (+) and SIGNAL terminals.
Prove Signal
A7
NETWORK
A8
A9
SYSTEM
Dry Contact
PROVE
A10
T
A11
OUTDOOR
TEMP
B Lockout Signal
B1
STAGE
A
B2
B3
STAGE
Dry Contact
B
B4
B5
STAGE
C
B6
B7
STAGE
D
B8
EMS INPUT
+
SIGNAL
Dry Contact
Setback Signal
SHIELD
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