33
441 01 2611 06
Changing Blower Speed
ELECTRICAL SHOCK HAZARD.
Failure to disconnect power could result in death,
personal injury and/or property damage.
Turn OFF power to furnace before changing speed
taps.
!
WARNING
NOTE: The speed taps that the manufacturer sets at the factory
for this furnace are based on a nominal 400 CFM per ton cooling
and the basic mid range on the temperature rise for heating.
Since the manufacturer cannot predict the static pressure
thatwillbeappliedtothefurnace,itistheresponsibilityofthe
installer dealer/contractor to select the proper speed tap
leads for the application when the furnace 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 ofunused blower motorspeed leads. Use
thechart(Table 9 )to determine the blowermotorspeedset-
tings.
Table 9 Blower Speed Chart
Wire Color Motor Speed
Black High
Orange* Med--High
Blue Med --Low
Red Low
* Med --High speed may not be provided on all models.
2. Changetheheatorcoolblowermotorspeedby removingthe
motor s peed lead from the “Heat”or“Cool” terminal and re-
place it withthe desired motorspeed lead from the “Unused
Motor Lead” location. Connect the wire previously removed
from the “Heat”or“Cool” terminal to the v acated “Unused
Motor Lead” terminal.
3. Ifthesamespeedmustbeusedforbothheatingandcooling,
remove the undesired motor speed lead from the “Heat” or
“Cool”terminalandconnectthatleadtothe openterminalat
“Unused Motor Lead” location or tapeoff. Attach a jumper
betweenthe“Heat”and“Cool” terminalsandtheremaining
motor speed lead.
Note: When using the same speed on motorswith (4)speed
leads,itwillbenecessarytotapeofftheterminalof themotor
speedlead removedfromthe“Heat”or“Cool” terminalwith
electrical tape since an open terminal will not be available at
the “Unused Motor Lead” location.
Thoroughly check the system after modification to ensure the
properoperationofthecirculatingairblowerinallmodesofopera-
tion.
Continuous--Fan Operation
A terminal is provided on the electronic fan control located in the
circulating air blower compartment for operation of the continu-
ous--fanoption. Thisconnectionisintendedforthelowspeedmo-
tortap, 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
properoperationofthecirculatingairblowerinallmodesofopera-
tion.
Separate speed selections for Heat, Cool, and
Continuous--Fan
Connect low speed lead from circulating air motor to the “Cont”
terminalattheelectronicfancontrol. Theappropriatemotorleads
shouldalreadybeconnectedtothe“Heat”and“Cool” terminals.
Heating and Continuous--Fan Speed the Same
Ifitisnecessarytooperatetheheatingspeedandcontinuous--fan
speed using the same blower speed, connect a jumper between
the “Heat” and “Cont” terminals on the electronic fan control.
Note: There should be only ONE motor lead going to the “Heat”
and “Cont” terminals.
13. Furnace Maintenance
FIRE, EXPLOSION, OR CARBON MONOXIDE
POISONING HAZARDS
Failure to have the furnace inspected and
maintained could result in death, bodily injury,
and/or property damage.
It is recommended that the furnace be inspected
and serviced on an annual basis(before the heating
season) by a qualified service agency.
!
WARNING
See “User’s Information Manual”.
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in dangerous operation, serious injury,
death or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
· Before servicing, disconnect all electrical
power to furnace.
· Whenservicingcontrols,labelallwiresprior to
disconnecting. Reconnect wires correctly.
· Verify proper operation after servicing.
!
W
RNING
To Next Page
Loading...
