Bard Furnace 2100-287 - Manual (Page 5)

Never store anything combustible near or on
your furnace. These include brooms,
dustmops, vacuum cleaners, other cleaning
toots or items, plastic or plastic containers,
paper bags or other paper products. A fire
could occur resulting in damage, injury or
death.
B.3. ALTERATION OF FURNACE CONTROLS
A
WARNING
Do not alter any gas or electrical controls (gas
control, pilot or safety controls) in any manner.
Altering them could cause furnace to operate
unsafely resulting in damage, injury or death.
SECTION 3 • UNDERSTANDING HOW
YOUR FURNACE WORKS
3.1 BASIC FURNACE - HEATING CYCLE
This furnace is operated by an Integrated Furnace
Control (IFC) which controls all functions of the
furnace.
On a call for heat from the thermostat, the IFC first turns on
the inducer motor. The pressure switch then closes
signaling the IFC to proceed with ignition function.
There is a 36 second ignitor heat-up period, then the gas
valve opens introducing main burner gas to be ignited by the
hot surface ignitor. The flame sensor proves ignition and
carryover across all burners.
There is a 30 second delay after main burner is on until the
comfort air blower starts on heating speed. After the
thermostat is satisfied, the burners will go off as gas
valve closes. The inducer will continue to nm for 30
seconds, and the comfort air blower will continue to nm
approximately two minutes.
3.2 ACCESSORIES (OPTIONAL, FIELD
INSTALLED)
The furnace and IFC are designed to accommodate both
electronic air cleaner and humidifier. The electronic air
cleaner circuit is powered anytime the comfort air
blower runs on either heating or cooling speed. The
humidifier circuit is powered anytime the inducer motor is
operating.
Your installer should have given you a detailed explanation
of how the furnace operates. Shown below are the basic
operation characteristics and sequence of operation. If you
have any questions consult your installer and/or service
agency.
3.3 COOLING CYCLE OPERATION
If optional add-on air conditioning system is installed, the
comfort air blower runs on cooling speed will run
continuously during the call for cool; and will stop 60
seconds after the thermostat is satisfied.
* * IMPORTANT * *
There are many types of thermostats
compatible with this furnace. Make sure you
understand the specific type installed. Ask
installer for detailed explanation, and retain
thermostat instruction manual for reference.
This furnace is equipped with a vent shut-off system which
monitors the combustion air into the burners by means of a
pressure sensing device. When the vent or air intake pipes
become blocked, this device turns off the gas valve circuit to
prevent flue products from entering the structure. In the
event that this occurs, shut off furnace and contact a
qualified service agency.
3.4 MANUAL FAN (CONTINUOUS AIRFLOW)
OPERATION
If wall thermostat is set to MANUAL (ON) position to
operate comfort air blower continuously to provide air
circulation throughout the building, the blower will
operate on the heating speed rather than the cooling as is
typical with most systems. This permits the air to
circulate as desired but helps keep the operating noise
level down as well as conserving energy.
During a call for cooling, the blower automatically shifts up
to cooling speed, and remains there until 60 seconds
after thermostat is satisfied then drops back to heating
speed.
Manual
Page 2100-287
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