International comfort products F9MXT0401410A Service And Technical Support Manual page 26

SERVICE AND TECHNICAL SUPPORT MANUAL
(same speed as LO HEAT), and begin a lowïheat cycle.
The blower motor BLWM will remain on until the end of
the prepurge period, then shut off for 24 seconds then
come back on at LO HEAT speed. When the W/W1 input
signal disappears, the furnace control begins a normal
inducer postïpurge period and the blower remains
running at LO HEAT
W/W1ïandïY1ïandïG signals disappear at the same
time, the blower motor BLWM will remain on for the
selected heatïoff
RïtoïW/W1ïandïY1 signals disappear, leaving the G
signal, the blower motor BLWM will remain on for the
selected heatïoff delay
continuousïblower speed.
When the RïtoïW/W1ïandïY/Y2, RïtoïW/W1ïandï
Y/Y2ï andïG, RïtoïW/W1ïandïY1ïandïY/Y2,
RïtoïW/W1ïandï Y1ïandïY/Y2ïandïG circuits are
energized the furnace control CPU will switch to or turn
on the blower motor BLWM at COOL speed, and begin a
highïheat cycle. The blower motor BLWM will remain on
until the end of the prepurge period, then shut off for 24
seconds then come back on at HI HEAT speed. When
the W/W1 input signal disappears, the furnace control
begins a normal inducer postïpurge period and the
blower switches to COOL speed after a 3 second delay.
If the RïtoïW/W1ïandïY/Y2ïandïG
RïtoïW/W1ïandïY1ïandï
disappear at the same time, the blower motor BLWM will
remain on for the selected heatïoff delay period. If the
RïtoïW/W1ïandïY/Y2
andïY1ïandïY/Y2 signals disappear, leaving the G
signal, the blower motor BLWM will remain on for the
selected heatïoff delay
continuousïblower speed.
Component Self Test
Refer to page 13 for instructions.
TwoïStage Furnace with SingleïSpeed
Figure 17
Air Conditioner
440 04 4321 02
speed. If the Rïtoï
delay period. If the
period then switch to
or
or
Y/Y2ïandïG signals
or RïtoïW/W1ï
period then switch to
Specifications subject to change without notice.
TwoïStage Furnace with TwoïStage Air
Figure 18
Conditioner
TwoïStage Furnace with SingleïStage
Figure 19
Heat Pump (Dual Fuel)
Gas Furnace: (F/G)9MXT
26