UTICA BOILERS UB90-125 Installation, Operation & Maintenance Manual page 23

Gas-fired, direct vent, condensing, hot water boiler
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AVOID THE FOLLOWING
Corners
Dead Spots
Alcoves
Behind doors
Concealed pipes or ducts
Stairwells - drafts
Cold Spots
Unheated rooms on the other side
of the wall
Concealed pipes
Fireplaces
TVs or radios
Hot Spots
Lamps
Direct sunlight
Kitchens
9 - ELECTRICAL WIRING
Thermostat Installation
• Follow instructions included with your thermostat.
• Locate thermostat five feet above floor on inside wall.
• Mount directly on wall or vertically mount on outlet box.
Thermostat should sense average room temperature.
• 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 jacket of boiler. See Figure 15, Page 22 for
service switch junction box and thermostat field wiring
connections.
Connect Circulator Pump Wiring
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
See Figure 16, Page 24 and Figure 17, Page 25 for service
switch junction box and circulator pump field wiring
connections. If the two 120 volt circulator wire terminals
inside junction box are not used, leave two wire nuts to
prevent short circuit.
23
NOTICE

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Ub90-200Ub90-150Ub90-175

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