14
7. CONNECT ELECTRICAL WIRING
7-a
DISCONNECT ELECTRICAL POWER
to the boiler and heating system before
servicing. Positively assure that no voltage is
present. Lock electrical boxes to prevent someone
from inadvertently restoring power before the
heating system is safe to operate.
NEVER DEFEAT OR JUMP OUT safety
devices.
PROTECT EACH BOILER circuit with a
properly sized over-current protection
device.
MAKE ELECTRICAL CONNECTIONS
CAREFULLY according to the boiler’s
wiring diagram and instructions
Refer to the
Internal Wiring
diagrams later in this
manual.
1.
Locate the wiring box on the left side of the
boiler and open the cover (Figure 7-a).
2.
Install a 120V disconnect near the boiler.
3.
Connect the 120V wiring from the disconnect
to the boiler's white (neutral), black (hot),
and green (ground) labeled "120VAC Power
supply". Do not reverse polarity.
4.
Connect the 120V wiring from the circulator
to the white (neutral) yellow (hot) wires
marked "circulator".
5.
Electrically bond to ground in accordance
with requirements of authority having
jurisdiction or, in the absence of such
requirements, with the
National Electrical
Code
, ANSI/NFPA 70.
WIRE AN ADDITIONAL SAFETY LIMIT
such as a low water cutoff or temperature
limit device, other than an IQ Control™ device,
in series with the 120V circuit used to power the
boiler. Do not alter the boiler’s factory wiring when
adding an additional limit.
6.
Connect the 24V wiring from the thermostat
to the "T-T" terminals on the Option Control
Panel.
7.
To connect other external devices, refer to
the instructions included with these devices.
1
1
2
3
T
T
7-b
THE MAXIMUM ALLOWABLE
CURRENT
for each circulator is 5 amps at
120V AC. For circulators with higher amp ratings,
you must install a circulator relay or starter coil to
provide line voltage to the circulator and connect
only the relay or starter coil to boiler terminals.
The combined boiler and circulator amperage must
not exceed 12 amps.
Install over-current protection in accordance with
authority having jurisdiction or, in the absence of
such requirements, follow the
National Electric
Code
, ANSI/NFPA 70. Do not provide over-
current protection greater than 15 amperes.
Summary of Contents for ESC
Page 7: ...7 Figure S 1 Minimum Clearances to Combustibles SPECIFICATIONS continued...
Page 20: ...20 Figure 10 d Operating Instructions 10 Perform Startup Checks and Adjustments continued...
Page 37: ...37 Internal Wiring Figure IW 1 Wiring Diagram...
Page 38: ...38 Internal Wiring continued Figure IW 2 Wiring Diagram...
