Lennox 13J76 User manual

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INSTALLATION INSTRUCTIONS FOR OUTDOOR AIR CFM CONTROL KIT (13J76; 613720-01)
USED ON LGH/LCH092-360 PACKAGED ROOFTOP UNITS
507473-02
1/2018
Supersedes 3/2017
©2018
OUTDOOR AIR CFM
CONTROL KIT
PACKAGED UNITS KITS
AND ACCESSORIES
Shipping and Packing List
Package 1 of 1 contains:
1- Outdoor air CFM flow control (A24) assembly
Bag assembly containing:
2-#10 - 5/8” Sheet metal screws
1-Wire tie
1-Bracket
6-#10 - 5/8” Self drilling screws
1-Template
2-#10 - 1” Sheet metal screws
Application
Units must be equipped with a supply air variable frequency
drive (VFD), an economizer, and an M3 Unit Controller.
When the supply air VFD is operating at lower speeds the
amount of fresh air pulled into the system may not meet
minimum outdoor air requirements. Based on input from
the O.A. control, the Unit Controller modulates outdoor air
dampers to maintain a constant amount of fresh air
regardless of blower speed.
Install Collar On Sensor
1- Install collar onto sensor at the 10.5 mark. See figure
1. Secure with the screw provided with sensor.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser
vice must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier
Install Sensor
1- Disconnect power to unit and open access panels.
2- Align the template provided in this kit as shown in
figure 2 or 3. Mark and drill holes. Discard the
template.
SECURE COLLAR TO SENSOR -
100501-02
FIGURE 1
10.5”
SENSOR
10.5”
COLLAR

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3- Install the sensor. See figure 4 for 092-152 units and
figure 5 for 156-360 units. Secure sensor with two
#10X5/8” sheet metal screws.
Note - Make sure the air velocity sensor is aligned
parallel with the air stream.
4- Coil excess probe cable and secure to low voltage
harness with wire tie.
POSITION TEMPLATE - 092-152 UNITS
FIGURE 2
TEMPLATE
ALIGN TEMPLATE
WITH HOLES
1”
3/32”
BRACKET PROVIDED ONLY
ON UNITS EQUIPPED WITH
A DDC CONTROL
3/32”
POSITION TEMPLATE - 156-360 UNITS
FIGURE 3
TEMPLATE
ALIGN HOLES ON
TEMPLATE WITH
HOLES IN UNIT
1”
3/32”
3/32”
092-150 UNITS
A24
CONTROL
SENSOR
FIGURE 4

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LGH/LCH156-360 UNITS
SENSOR
FIGURE 5
A24
CONTROL
SEAL
BRACKET
(156-300S ONLY)
Install A24 Control
Use a field-provided, 22AWG, 3-wire cable to wire the
outdoor air control. Cable should be 30” long for
092-152 units and 120” long for 156-360 units.
1- Remove the A24 cover and connect the
field-provided cable as shown in figure 6.
2- 092-240 & 300S Units Only -
Secure the A24 control onto the bracket and secure
with two 1” screws provided in kit. Install the bracket
assembly into the unit and secure with 5/8” self
drilling screws. See figure 7 for 092-152 units and
figure 8 for 156-240 & 300S units.
242, 300H, & 360 -
Install the A24 control into the unit and secure with 1”
sheet metal screws. See figure 8. The bracket and
5/8” self drilling screws are not used.
3- Route the cable to the M3 Unit Controller. See figure
7 for 092-152 units and figure 8 for 156-360 units.
A24 CONTROL WIRING
M3 Unit Controller P298 Connector
A24
123
FIGURE 6
1-V+ - 24VAC
2-GND - Common
3-AV - Airflow Output
(0-10VDC)
24VAC
RC
SENSOR
IAQ
AI1
SENSOR
HUM TMP
OUTPUTS
DO1 DO1

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WIRE ROUTING - 092-152 UNITS
A24
CONTROL
SENSOR
M3 UNIT
CONTROLLER
P298
CABLE
FIGURE 7
BRACKET

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WIRE ROUTING - 156-360 UNITS
FIGURE 8
A24
CONTROL
SENSOR
ROUTE CABLE
THROUGH TUBING
M3 UNIT
CONTROLLER
P298
CABLE
BRACKET
(156-240 & 300S
ONLY)

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Configuration ID Setting
1- Enable the Outdoor Air Control feature and set the
velocity sensor range using the M3 Unit Controller
SETUP > INSTALL menu. Navigate to
Configuration ID 1. Set position 8to:
H Outdoor air control installed with A24 control set
for high range (0-1968ft/min)
2- Make sure the A24 jumper is installed in the low range
position as shown in figure 9.
3- Operate the blower in high speed and adjust the
minimum damper position. Use SETUP > TEST &
BALANCE > DAMPER > MIN DAMPER POSITION
menu. Adjust minimum damper position and press
SAVE. The Unit Controller will automatically save and
display the velocity setpoint. Press SAVE again to
confirm.
Note - The minimum damper position setting MUST be
set lower than the OAC max damper position setting (50%
default). To modify the max damper position setting,
navigate to SETTINGS > EDIT PARAMETERS and
select parameter 117 (DCV MAX DAMPER OPEN).
Additional outdoor air CFM control settings are available.
See parameters 117 and 134 in the Unit Controller manual.
Make adjustments through the SETTINGS > EDIT
PARAMETERS menu; select the required parameter.
4- Replace A24 control cover.
NOTE - Refer to local codes or authorities having
jurisdiction when determining design minimum outdoor
air requirements.
Velocity Sensor Settings
The A24 control is factory-set for 0-10m/s. (0-1968ft/min.)
Note - The configuration ID velocity range must be set to
"H" and the jumper setting on the A24 control must be set
at low range. No other combinations may be used with the
100501-02 sensor.
The jumper is factory-set at low range (0-1968ft/min).
FIGURE 9
VELOCITY SENSOR (A24) JUMPER SETTINGS
V+
GND
AV
0-10m/s (0-1968ft/min.)
24VAC
Common
Airflow Output
(0-10VDC)
1
2
3
JUMPERS
t90
HI
MED
LO
I
U
t90
HI
MED
LO
I
U
Sets respond time to 4 sec.
Sets output signal to voltage