SYSTEM OPERATION
25
Circulator Blower Speed Facts
1. Motor speed Tap wiring must remain in factory position
on the control board and motor.
2. There are 4 speed Tap wires to the motor T1, T2, T3, T4.
3. There are 5 speeds available, depending on DIP switch
4. Heating input (W1/ W2) always has priority over all other
thermostat input.
5. Cooling input (YLo/ Y) has priority over continuous fan
input.
6. Continuous fan input (G) has lowest priority.
*The blower speed wiring connections must remain in
factory position.
2. If a cooling or heat pump condensing unit is being used
in conjunction with this furnace, the three DIP switches in
S2 are used to select the proper cooling speeds to match
the outdoor unit size. Typical CFM requirements are 400
CFM / Ton.
1. Turn OFF power to the furnace.
2. Select the cooling blower speeds that match the installation
Installation Manual, If factory cooling speeds do not match
the installation requirements, the dip switch settings must
be changed from factory position
3. Turn ON power to furnace.
4. Verify proper temperature rise in heat modes and CFM in
cooling modes
Duct systems and register sizes must be properly designed
for the C.F.M. and external static pressure rating of the
furnace. Ductwork should be designed in accordance with
the recommended methods of “Air Conditioning Contractors
of America” manual D.
A duct system should be installed in accordance with
Standards of the National Board of Fire Underwriters for
the Installation of Air Conditioning, Warm Air Heating and
Ventilating Systems, Pamphlets No. 90A and 90B.
shall comply with UL900 or CAN/ULC-S111 Standards. If
the warranty.
Upow furnaces with air delivery of less than 1800 CFM:
Use one side return or one bottom return ductwork connection.
Upow furnaces with air delivery of 1800 CFM or higher:
Use two side returns or one side return and one bottom return
connection.
Guide dimples locate the side and bottom return cutout
locations. Use a straight edge to scribe lines connecting the
dimples. Cut out the opening on these lines. An undersized
opening will cause reduced airflow. For bottom return
connection, remove the bottom of the cabinet before setting
the furnace on the raised platform or return air duct.
A closed return duct system must be used, with the return
duct connected to the furnace. NOTE: Ductwork must never
be attached to the back of the furnace. Supply and return
to reduce noise transmission, if desired. If a central return is
used, a connecting duct must be installed between the unit
and the utility room wall so the blower will not interfere with
combustion air or draft. The room, closet, or alcove must not
be used as a return air chamber.
When the furnace is used in connection with a cooling unit,
the furnace should be installed in parallel with or on the
upstream side of the cooling unit to avoid condensation in
be adequate to prevent chilled air from entering the furnace
and, if manually operated, must be equipped with means to
prevent operation of either unit unless the damper is in the
full heat or cool position.
When the furnace is heating, the temperature of the return
air entering the furnace must be between and .
Depending on the installation and/or customer preference,
installed in the central return register and a side panel external
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