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High Voltage (TB2) Terminal Block (SC3000 & SC4000)
Start Interlock #2 –
The Start Interlock #2 TB2-1 and TB2-2 terminals are in series with Start Interlock
#1 and provide additional connection points for auxiliary safety devices. This circuit is energized with
120VAC, so the contacts on any auxiliary safety devices must be rated for minimum 120VAC.
Start Interlock #1 –
The Start Interlock #1 TB2-3 & TB2-4 terminals can be used for auxiliary safety
devices such as damper limit switches, control valve limit switches, emergency stop buttons, and low
water cutoff devices. This circuit is energized with 120VAC, so the contacts on any auxiliary safety
devices must be rated for a minimum of 120VAC. The appliance ships with a factory-installed jumper
across Start Interlock #1 and Start Interlock #2 terminals. Remove the jumper(s) if using any auxiliary
safety devices.
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
Be sure to check the
nameplate on the boiler
before connecting the
electrical supply.
N
!
OTICE
A dedicated earth ground
(green wire) is required to
avoid nuisance shutdowns.
Do not ground through the
conduit!
The high voltage (TB2)
terminal block on the SONIC
SC-3000 & SC-4000 with
NURO controls contains dry-
contact relays with a
maximum voltage rating of
240VAC and 1/2 Amp
maximum current capacity.
Incorrect wiring can result in
equipment damage, injury, or
death.
1004905978 P-K SONIC NURO Installation and
Owners Manual (Rev F Jun-2017).docx
Page 18
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