1.. Placethermometersinsupplyandreturnairregistersas 2.
closetofurnaceaspossible,avoidingdirectradiantheat
fromheatexchangers.
2. Takereadingsandcomparewithrangespecifiedonrating
plate.
3. Ifthetemperatureriseisnotinthecorrectrange,theblower
speedmustbechanged.Ahigherblowerspeedwilllower
3.
thetemperaturerise.A lowerblowerspeedwillincrease
thetemperaturerise.
ChangingBlowerSpeed
Electrical shock hazard.
Turn OFF power to furnace before changing speed
taps.
Failure to do so can result in death, personal injury
and/or property damage.
NOTE: Wiring diagram may not reflect actual factory settings. In-
staller/contractor must choose proper speed taps for individual
applications.
Since the manufacturer cannot establish the static pressure
that will be applied to the unit, it is the responsibility of the
installer dealer/contractor to select the proper speed taps for
the application when the unit is installed.
If it is necessary to change speeds, refer to steps below.
1. Refer to Furnace Wiring Diagram for location of the heating
and cooling speed taps located on the electronic fan control
as well as location of unused blower motor speed leads. Use
the chart (Table 7) to determine the blower motor speed set-
tings.
Blower Speed Chart
Wire Color
Black
Orange*
Blue
Red
Motor Speed
High
Med-High
Medium
Low
* Med-High speed may not be provided on all models.
Change the heat or cool blower motor speed by removing the
motor lead from the "Heat" or "Cool" terminal and replace it
with the desired motor speed lead from the "Unused Motor
Lead" location. Connect the wire previously removed from
the "Heat" or "Cool" terminal to the vacated "Unused Motor
Lead" terminal.
If the same speed must be used for both heating and cooling,
remove the undesired motor speed lead from the "Heat" or
"Cool" terminal and connect that lead to the open terminal at
"Unused Motor Lead" location or tape off. Attach a jumper
between the "Heat" and "Cool" terminals and the remaining
motor speed lead.
Note: When using the same speed on motors with (4) speed
leads, it will be necessary to tape off the terminal of the motor
speed lead removed from the "Heat" or "Cool" terminal with
electrical tape since an open terminal will not be available at
the "Unused Motor Lead" location.
ContinuousFan Operation
A terminal is provided on the electronic fan control located in the
circulating blower compartment for operation of the continuous
fan option. This connection is intended for the low speed motor
tap, and has a lower contact rating (8 amps) than the heat and
cool taps. When the low speed blower lead is connected to this
terminal, this will provide low speed blower operation whenever
the other two speeds (Heat or Cool) are not energized.
Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of op-
eration.
Separate speed selections for Heat, Cool, and
Continuous Fan
Connect low speed lead from circulating motor to the "Cont" ter-
minal at the electronic fan control. The appropriate motor leads
should already be connected to the "Heat" and "Cool" terminals.
Heatingand Continuous Blower Speed the Same
If it is necessary to operate the heating speed and continuous
blower speed using the same blower speed, connect a jumper be-
tween the "Heat" and "Cont" terminals on the electronic fan con-
trol.
Note: There should be only ONE motor lead going to the "Heat"
and "Cont" terminals.
11. FurnaceMaintenance
CAUTION
It is recommended that the furnace be inspected and
serviced on an annual basis (before the heating sea-
son) by a qualified service technician.
See "User's Information Manual".
_] 44t 01 2308 01
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