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NOTE: The Start Interlock circuit must close within 5 minutes of a call for heat. Failure to close the
Start Interlock circuit will cause the appliance to lockout on alarm.
Auxiliary Input #2 –
The TB2-5 & TB2-6 terminals are reserved for future use. This circuit is energized
.
with 120VAC
Auxiliary Input #1 –
The TB2-7 & TB2-8 terminals are reserved for future use. This circuit is energized
.
with 120VAC
Air Damper Interlock – The Air Damper Interlock TB2-9 & TB2-10 terminals
end limit switch on a motorized air damper. This circuit is energized with 120VAC, so the contacts on
the end limit switch must be rated for minimum 120VAC. The appliance ships with a factory-installed
jumper across the Air Damper Interlock terminals. Remove the jumper if connecting a motorized air
damper with end limit switch.
NOTE:
The boiler ships with a factory-installed jumper across the Air Damper Interlock terminals.
Remove the jumper if connecting a motorized air damper with end limit switch.
Ground – Grounding connection for auxiliary safety/limit devices on terminals TB2-11 & TB2-12.
NOTE: This ground terminal is connected to the TB2 sheet metal and is not common with the
appliance's electrical service ground.
Relay A, B, C & D – User-configurable relay outputs A (TB2-19 & TB2-20), B (TB2-17 & TB2-18), C
(TB2-15 & TB2-16) & D (TB2-13 & TB2-14). The normally-open contacts on these relays have a
maximum voltage rating of 240VAC and maximum current capacity of 1/2 Amp.
NOTE: Refer to
7.1
through D can be user-configured through the NURO
such as the Comfort Heat (CH) pump, Domestic Hot Water (DHW) Pump, Air Damper, System
Pump, etc.
Master Alarm Relay – The Master Alarm Relay TB2-21 & TB2-22 terminals are normally-open dry
contacts that close in the event of an alarm output from the NURO control. The normally-open contacts
on this relay have a maximum voltage rating of 240VAC and maximum current capacity of 1/2 Amp.
Revised: June 2, 2017
Released: June 2, 2017
for proper
wiring and configuration of the electrical connections. Relays A
HARSCO Industrial, Patterson-Kelley 2017
All Rights Reserved.
P-K SONIC
Technical Service 1.877.728.5351
®
touch screen interface to control devices
1004905978 P-K SONIC NURO Installation and
Owners Manual (Rev F Jun-2017).docx
®
Gas Fired Boiler
allow for proof of open
Page 19
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