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Low Voltage (TB1) Terminal Block
Enable/Disable –TB1-1 and TB1-2 can be used to remotely enable or disable the boiler. The
functionality of these terminals is user-configurable through the NURO
of the Enable/Disable circuit provides a call for heat to the boiler. Opening this circuit prevents the
boiler from running.
NOTE:
The boiler ships with a factory-installed jumper across the Enable/Disable terminals. This
circuit is energized with a 24VAC potential, so the contacts on any remote enable devices must be
rated for minimum 24VAC.
4-20mA Analog Input – TB1-3 and TB1-4 can be used to provide a remote analog 4-20mA control
signal to the boiler. This analog signal can be used to change the boiler's operating setpoint/firing rate.
Spare Analog Input – TB1-5 and TB1-6 are reserved for future use.
Revised: June 2, 2017
Released: June 2, 2017
HARSCO Industrial, Patterson-Kelley 2017
All Rights Reserved.
®
P-K SONIC
Gas Fired Boiler
Technical Service 1.877.728.5351
®
controls, but generally closure
1004905978 P-K SONIC NURO Installation and
Owners Manual (Rev F Jun-2017).docx
Page 20
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