Lennox Allied Air L83BF, Installation Instructions Manual

Page: 11 / 16

506794-01 Page 11 of 16 Issue 1243
humidity. In this setup, the variable speed motor will operate
at 82% of the normal cooling airflow rate whenever there
is a call for dehumidification. When the relative humidity
has been brought down to an acceptable level, the cooling
blower speed will return to 100% of design.
Circulating Airflow Adjustments
Cooling Mode
The units are factory set for the nominal airflow for each
model. Adjustments can be made to the cooling airflow
by changing the position (A, B, C, or D) of the jumper
plug on the tap marked COOL (on the blower interface
board) based on the information provided in Table 2. To
determine what CFM the motor is delivering at any time,
count the number of times the LED labeled CFM on the
blower interface board flashes. Each flash signifies 100
CFM; count the flashes and multiply by 100 to determine
the actual CFM delivered (for example: 10 flashes x 100 =
1000 CFM).
Moving the jumper plug on the tap marked ADJUST from
the NORM position to the (+) or (–) position will increase or
decrease the cooling airflow (Y or O call) by 15%. Changing
the position of the ADJUST jumper plug does not affect
heating airflow except if a heat pump is used in conjuction
with the oil furnace. If a heat pump is used, moving the
ADJUST jumper plug to the (+) or (–) position will increase
or decrease the airflow by 15% when operating in all heat
pump modes, but will not affect heating airflow when the oil
furnace is used for heating.
For single stage cooling, jumper Y1 and Y2 to obtain rated
cooling CFM. In two stage cooling configuration, Y1 will
produce 70% of rated cooling CFM and Y2 will produce
100%.
Heating Mode
The unit as shipped is factory set to run at the middle of the
heating rise range as shown on the unit rating plate. The
jumper plug on the tap marked HEAT should remain in the
position (A, B, C, or D) listed in the HEAT Setting column
found in Table 2.
ADJUST*, HEAT, and COOL Taps
(on Blower Interface Board)
DEHUMIDIFY
CUT TO ENABLE
COOL HEAT ADJUST
NORM A
B
C
D
A
B
C
D
(+)
(–)
TEST
D1
* Placing ADJUST jumper plug in the TEST position energizes the motor to a default factory setting. This
can be used to determine if the motor is operating properly. Test pin function is enabled during any mode
of thermostat call. If no thermostat call is present, test function is disabled. The ADJUST jumper plug
must be returned to original position after testing procedure is completed. Failure to do so will result in
improper air flow.
Model
Motor
HP
Heat
Setting
Heating
CFM
Heating CFM @ .50 Static Cooling CFM @ .50 Static
Heat
Setting
A
Heat
Setting
B
Heat
Setting
C
Heat
Setting
D
Cool
Setting
A
Cool
Setting
B
Cool
Setting
C
Cool
Setting
D
L83UFC57V12 1/2 D 750 1300 1100 1000 750 1200 1000 800 600
L83UFC72V12 1/2 C 1000 1300 1100 1000 750 1200 1000 800 600
L83UFC84V14 1/2 D 1200 1500 1400 1300 1200 1400 1200 1000 800
L83UFC95V14 1/2 C 1300 1500 1400 1300 1200 1400 1200 1000 800
L83UFC112V20 3/4 D 1400 1850 1730 1550 1400 2000 1800 1600 1200
L83UFC125V20 3/4 B 1730 1850 1730 1550 1400 2000 1800 1600 1200
L83BFC84V14 1/2 D 1200 1550 1450 1400 1200 1400 1200 1000 800
L83BFC95V14 1/2 B 1450 1550 1450 1400 1200 1400 1200 1000 800
L83BFC112V20 1 D 1450 2000 1730 1550 1450 2000 1800 1600 1200
L83BFC125V20 1 B 1730 2000 1730 1550 1450 2000 1800 1600 1200
L83BRC84V14 1/2 D 1200 1550 1450 1400 1200 1400 1200 1000 800
L83BRC95V14 1/2 B 1450 1550 1450 1400 1200 1400 1200 1000 800
L83BRC112V20 1 D 1450 2000 1730 1550 1450 2000 1800 1600 1200
L83BRC125V20 1 B 1730 2000 1730 1550 1450 2000 1800 1600 1200
L83HFC84V12 1/2 D 1000 1300 1200 1150 1000 1200 1000 800 600
L83HFC95V12 1/2 B 1200 1300 1200 1150 1000 1200 1000 800 600
L83HRC84V12 1/2 D 900 1200 1100 1000 900 1200 1000 800 600
L83HRC95V12 1/2 B 1100 1200 1100 1000 900 1200 1000 800 600
Table 2. Adjusting Airflow