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440 01 2021 01
Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of opera-
tion.
Separate speed selections for Heat, Cool, and
Continuous Fan
Connect low speed lead from circulating motor to the “
Cont.
” ter-
minal at the furnace control board. The appropriate motor leads
should already be connected to the “
Lo Heat
and
Hi Heat
” and
“
Cool
” terminals.
Heating and 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 furnace control.
(Will not have EAC energized during Continuous Fan)
Note
: There should be only
ONE
motor lead going to the “
Heat
”
and “
Cont.
” terminals.
Changing Blower Speed
(*9MPV Models)
ELECTRICAL SHOCK HAZARD.
Failure to disconnect power could result in death or
personal injury.
Turn OFF power to furnace before changing blower
speed.
!
WARNING
NOTE
: The blower speeds that the manufacturer sets from the
factory for this product are based on a nominal 400 CFM per ton
cooling and the mid range on the temperature rise for heating.
Since the manufacturer cannot predict the static pressure
that will be applied to the furnace, it is the responsibility of the
installer dealer/contractor to select the proper speeds for the
application when the furnace is installed.
If it is necessary to change speeds, refer to steps below.
1. The 115 VAC power supply to the furnace must be turned
OFF before making adjustments to the motor.
NOTE: Allow at least 1 minute before restoring power to the
furnace after making Blower Control changes.
2. The heating, cooling and continuous blower speeds can be
adjusted by changing the dip switch settings that are located
on the tap--select interface board (see
Figure 52
). Switches
#1 and #2 adjust the continuous blower speeds. Switches
#3, #4 and #5 adjust the heating speeds. Switches #6, #7
and #8 adjust the cooling speed. See the “
Technical Sup-
port Manual”
for the switch settings for the desired airflow
rates for the installation.
Variable Speed (*9MPV) Tap Select Interface Board (TSIB)
25--24--76
(TSIB)
Figure 52
10. Furnace Maintenance
FIRE,
EXPLOSION,
OR CARBON MONOXIDE
HAZARDS
Failure to have the furnace inspected and
maintained could result in fire, explosion, personal
injury or death.
It is recommended that the furnace be inspected
and serviced on an annual basis (before the heating
season) by a qualified service technician.
See “User’s Information Manual”.
!
WARNING
See
“User’s Information Manual” and the “Service Manual”.
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning exactly could result
in dangerous operation, death, personal injury
and/or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
·
Before servicing, disconnect all electrical
power to furnace.
·
When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
·
Verify proper operation after servicing.
!
WARNING
Summary of Contents for *9MPT050F12
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