High Voltage (Tb2) Terminal Block - Harsco Industrial SC-1500 Owner's Manual

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-1500 and SC-2000 with
NURO controls contains two
hot leads (HOT L1 & HOT L2),
a neutral lead (NEUTRAL) and
a ground lead (GROUND) for
208- 240 VAC, single phase
60Hz electrical supply. This
terminal block (TB2) also
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.
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.
Relay D –
User-configurable relay output #4. The normally-open contacts on this relay have a maximum
voltage rating of 240VAC and maximum current capacity of 1/2 Amp.

3.2.4 High Voltage (TB2) Terminal Block

Start Interlock #2 –
The Start Interlock #1 terminals can be used for
auxiliary safety devices such as damper end limit switches, control valve
end limit switches, emergency stop buttons, and low water cutoff devices.
This circuit is energized with
safety devices must be rated for a minimum of
Start Interlock #1 –
The Start Interlock #2 terminals are in series with
Start Interlock #1 and provide additional connection points for auxiliary
safety devices. This circuit is energized with
any auxiliary safety devices must be rated for minimum
The boiler 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
Both the Start Interlock #1 and Start Interlock #2 circuits
must close within 5 minutes of a call for heat. Failure to
close the Start Interlock circuit will cause the boiler to
lockout on alarm
Auxiliary Input #2 –
These terminals are reserved for future use. This
circuit is energized with
Auxiliary Input #1 –
These terminals are reserved for future use. This
circuit is energized with
Air Damper Interlock – The Air Damper Interlock provides dedicated
terminals for proof of open 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 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.
Relay A – User-configurable relay output #1. The normally-open contacts
on this relay have a maximum voltage rating of 240VAC and maximum
current capacity of 1/2 Amp.
Relay B – User-configurable relay output #2. The normally-open contacts
on this relay have a maximum voltage rating of 240VAC and maximum
current capacity of 1/2 Amp.
Relay C – User-configurable relay output #3. The normally-open contacts
on this relay have a maximum voltage rating of 240VAC and maximum
current capacity of 1/2 Amp.
P-K SONIC
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, so the contacts on any auxiliary
120VAC
120VAC
.
NOTE
.
.
120VAC
.
120VAC
TM
Gas Fired Boiler
.
120VAC
, so the contacts on
.
120VAC