Controls And Accessories - UTICA BOILERS UB90-50 Installation, Operation & Maintenance Manual

1 - Integrated Boiler Control (IBC)
• Integrated Boiler Control (IBC) is a microprocessor
based controller for high effi ciency gas boilers.
• Controller monitors all safety controls which control
operation of combustion air blower, circulator pump,
burner, and combination hot surface igniter/fl ame
sensor.
• Controller is not intended for use with vent damper.
Controller is mounted on control panel inside boiler.
Contains fi ve diagnostic indicator lights.
2 - High Limit Control
NOTICE
Maximum set-point of limit control must not exceed
190°F.
• High limit control determines maximum boiler water
temperature and provides means for protecting boiler
and heating system from unsafe operating conditions
which could damage boiler.
• Control is mounted in ¾" NPT control well on top of front
boiler section at hot water outlet.
• Control is tied in with IBC and factory set at 190°F water
temperature.
• High limit set-point is fi eld adjustable and may be set
between 100°F and 190°F.
• Field set-point adjustment for each installation depends
on heating system requirements.
• Differentials are automatic, vary based on control
settings and boiler temperature.
• Refer to limit manufacturer instructions provided with
limit control.
Figure 23 - Indicator Lights

CONTROLS AND ACCESSORIES

A - Setting High Limit
To adjust, turn HI TEMP dial
is displayed. Overall range of High limit setting is from
100°F to 220°F (82° C to 104° C). High limit (HL) on limit
control is factory set at 190°F. Temperature setting may be
varied to suit requirements of installation. Differentials are
automatic and will vary based on control settings and boiler
temperature. See Figure 23.
B - Setting Economy Feature
• Economy feature is factory set for 1 zone heating
• Do not include indirect water heaters in number of
• Economy feature conserves fuel by reducing boiler
• Conversely, if boiler provides adequate heat, added
• If heating and indirect water heater signals were not
34
system. To adjust, turn ECONOMY dial until number
displayed equals number of heating zones.
heating zones.
temperature. If heating system is unable to supply
needed heat to house, ECONOMY dial should be turned
to lower setting. (example: in a three zone house, turn
dial to 2 or 1).
fuel savings can be achieved by selecting higher setting
(example: 4 or 5).
separated when wiring the control, Economy feature
should be turned off to ensure the boiler supplies
adequate temperature to heat indirect tank.
1 until desired setting