Lennox O23V Series, Installation Instructions Manual

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Page 15
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% of the
COOL CFM selected.
OFF CALL
50%
G
g
G − Fan switch ON
g − Fan switch OFF
NOTE − With the proper thermostat and subbase, continu-
ous blower operation is possible by closing the R to G cir-
cuit.
Dehumidification
The A54 blower control board (see figure 17) includes a
HUM terminal which provides for connection of a humidis-
tat. The JW1 jumper 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 se-
lected air flow rate by 18% when humidity levels are high.
An LED (D1) lights when the blower is operating in the de-
humidification mode.
Humidification
Terminals are provided on the A15 control board for 120
volt output to operate a humidifier. The HUM" terminal is
energized when there is a call for heat. See figure 18.
Electronic Air Cleaner
Terminals are provided on A15 control board for 120 volt
output to an electronic air cleaner. The EAC" terminal is
energized when there is a call for heat, cool, or continuous
blower. See figure 18.
Table 6
Blower Performance
{0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range}
ADJUST"
Jumper
Setting
HEAT" Jumper Speed Position [kBtuh heat input] COOL" Jumper Speed Position
A B C D A B C D
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
Model O23V2/3−70/90 Units
Do not use Do not use [−90] [−70]
(+) N/A N/A N/A N/A Same as NORM 1380 650 1150 545 920 435 690 325
NORM N/A N/A N/A N/A 1000 470 750 355 1200 565 1000 470 800 380 600 285
(–) N/A N/A N/A N/A Same as NORM 1020 480 850 400 680 320 510 240
Model O23V3/4−105/120 Units
Do not use Do not use [−120] [−105]
(+) N/A N/A N/A N/A Same as NORM 1610 760 1380 650 1150 540 920 435
NORM N/A N/A N/A N/A 1300 615 1200 565 1400 660 1200 565 1000 470 800 380
(–) N/A N/A N/A N/A Same as NORM 1190 560 1020 480 850 400 680 320
Model O23V5−140/154 Units
Do not use [−154] Do not use [−140]
(+) N/A N/A
Same as
NORM
N/A N/A
Same as
NORM
2300 1085 2070 975 1840 870 1380 650
NORM N/A N/A 1730 816 N/A N/A 1400 660 2000 945 1800 850 1600 755 1200 565
(–) N/A N/A
Same as
NORM
N/A N/A
Same as
NORM
1700 800 1530 720 1360 640 1020 480
NOTE − Continuous Fan air volume is 50% of COOL speed.
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