Electrical Wiring - UTICA BOILERS UB90 125 Installation Manual And Operating Instructions

!
WARNING
Turn off electrical power at fuse box before
making any line voltage connections. Follow
local electrical codes.
All electrical work must conform to local codes as
well as the National Electrical Code, ANSI/NFPA-
70, latest revision. In Canada, electrical wiring shall
comply with the Canadian Electrical Codes, CSA-
C22.1 and .2.
ELECTRIC POWER SUPPLY
Prior to making any line voltage connections, ser-
vice switch at boiler should be in the off position
and the power turned off at the fuse box.
Run a 120 volt circuit from a separate over current
protection device in the electrical service entrance
panel.
NOTE: Use copper conductors only.
This should be a 15 ampere circuit. A service switch
has been pre-wired and located on the exterior
boiler jacket. See Figure 13 for diagram showing
location of service switch junction box and power
supply connection points. Connect black (hot) lead
from the power supply to either of the unused brass
screws on the service switch. Connect the white
(neutral) lead from the power supply to the white
screw on the service switch. Connect the green
(ground) lead from the power supply to the ground
(green) screw on the service switch. The recepta-
cle on the service switch is always powered regard-
less of whether the switch is on or off, and could be
used as a power supply for an external condensate
pump if one is used.
X. ELECTRICAL WIRING
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Figure 13
The boiler, when installed, must be electrically
grounded in accordance with the requirements of
the authority having jurisdiction or, in the absence
of such requirements, with the National Electrical
Code, ANSI/NFPA-70, latest revision. In Canada,
electrical wiring shall comply with the Canadian
Electrical Codes, CSA-C22.1 and .2.
Run a 14 gauge or heavier copper wire from the
boiler to a grounded connection in the service pan-
el or a properly driven and electrically grounded
ground rod.
INSTALLING THE THERMOSTAT
The thermostat location has an important effect on
the operation of your boiler system. BE SURE TO
FOLLOW THE INSTRUCTIONS INCLUDED WITH
YOUR THERMOSTAT.
Locate the thermostat about five feet above the
floor on an inside wall. It may be mounted directly
on the wall or on a vertical mounted outlet box. It
should be sensing average room temperature.
AVOID THE FOLLOWING:
• Dead Spots - corners; alcoves; behind
doors
• Cold Spots - concealed pipes or ducts;
stairwells - drafts; unheated rooms on the
other side of the wall
• Hot Spots - concealed pipes; fireplaces; TVs
or radios; lamps; direct sunlight; kitchens
Set heat anticipator at 0.7 amps. Connect 24 volt
thermostat leads to the two (2) yellow wires located
in service switch junction box, located on outer jack-
et of boiler. See Figure 12 for service switch junction
box and thermostat field wiring connections.
CONNECT CIRCULATOR PUMP WIRING
See Figure 14 for service switch junction box and
circulator pump field wiring connections. If the two
120 volt circulator wire terminals inside the junction
box are not used, please leave the two wire nuts to
prevent the short circuit.
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Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause improp-
er and dangerous operation. VERIFY PROPER
OPERATION AFTER SERVICING.
15
!
CAUTION