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COOL
The
COOL
jumper is used to determine the CFM during
cooling operation. This jumper selection is activated for
cooling when Y1 is energized.
The blower motor runs at 80 percent of the selected air flow
for the first 7−1/2 minutes of each cooling demand. This fea-
ture allows for greater humidity removal and saves energy.
In the cooling mode, the blower control board delays
blower operation for 5 seconds after the compressor starts.
The blower continues to operate for 90 seconds after the
compressor is de−energized.
HEAT
The
HEAT
jumper is used to determine CFM during back-
up electric heat operation only. These jumper selections
are activated only when W is energized.
In the backup heat mode, the blower continues to operate
for 2 minutes after the heating demand is satisfied.
NOTE − Due to the nature of electric heat, CFM settings are
limited.
CONTINUOUS FAN
When the thermostat is set for Continuous Fan" operation
and there is no demand for heating or cooling, the blower
control will provide 50 percent of the
COOL
CFM selected.
NOTE − With the proper thermostat and subbase, continu-
ous blower operation is possible by closing the R to G cir-
cuit. Cooling blower delay is also functional in this mode.
DEHUMIDIFICATION
The blower control board includes an HUM terminal which
provides for connection of a humidistat. The JV1 resistor
on the blower control board must be cut to activate the
HUM terminal. The humidistat must be wired to open on
humidity rise. When the dehumidification circuit is used,
the variable speed motor will reduce the selected air flow
rate by 25 percent when humidity levels are high. An LED
(D1) lights when the blower is operating in the dehumidifi-
cation mode.
Table 2
15CHAX−24, 15CHAX−30 Blower Performance
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
AD
Jumper Speed Positions
AD-
JUST"
COOL" Speed
HEAT" Speed
CONTINOUS FAN" Speed
JUST"
Jumper
A
B
C
D
A
B
C
D
A
B
C
D
Jumper
Setting cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+ 1150 545 920 435 690 325 1035 490 1150 545 1150 545 1150 545 1150 545 575 270 460 215 345 165 520 245
NORM 1000 470 800 380 600 285 900 425 1000 470 1000 470 1000 470 1000 470 500 235 400 190 300 140 450 210
− 850 400 680 320 510 240 765 360 1000 470 1000 470 1000 470 1000 470 425 200 340 160 300 140 385 180
Table 3
15CHAX−36 Blower Performance
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
AD
Jumper Speed Positions
AD-
JUST"
COOL" Speed
HEAT" Speed
CONTINOUS FAN" Speed
JUST"
Jumper
A
B
C
D
A
B
C
D
A
B
C
D
Jumper
Setting cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+ 1380 650 1150 545 920 435 1265 575 1380 650 1380 650 1150 545 1150 545 690 325 575 270 460 215 635 300
NORM 1200 565 1000 470 800 380 1100 520 1200 565 1200 565 1000 470 1000 470 600 285 500 235 400 190 550 260
− 1020 480 850 400 680 320 935 440 1200 565 1200 565 1000 470 1000 470 510 240 425 200 350 165 470 220
Table 4
15CHAX−42, 15CHAX−48, 15CHAX−60, Blower Performance
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
AD
Jumper Speed Positions
AD-
JUST"
COOL" Speed
HEAT" Speed
CONTINOUS FAN" Speed
JUST"
Jumper
A
B
C
D
A
B
C
D
A
B
C
D
Jumper
Setting cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+ 2070 975 1840 870 1610 760 1380 650 1610 760 1610 760 1610 760 1610 760 1035 490 920 435 805 380 690 325
NORM 1800 850 1600 755 1400 660 1200 565 1400 660 1400 660 1400 660 1400 660 900 425 800 380 700 330 600 285
− 1530 720 1360 640 1190 560 1020 480 1400 660 1400 660 1400 660 1400 660 765 360 680 320 595 280 510 240
