Lennox F1943L-3P User manual

INSTALLATION
INSTRUCTIONS
VRF Systems - Controls
508210-02
08/2022
VRF Wi-Fi Controller Installation
VRF
©2022 Lennox Industries Inc. Dallas, Texas, USA
This manual must be left with the owner for
future reference.
WARNING
!
Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, personal injury or loss of life.
Installation and service must be performed by a
licensed professional HVAC installer (or equivalent)
or service agency.
General
The F1943L-3P (19B16) controller is a wired touch
screen programmable local controller for VRF Heat
Recovery and Heat Pump indoor units capable of
Wi-Fi control via a mobile application. These instruc-
tions are intended as a general guide and do not su-
persede local codes in any way. Consult authorities
having jurisdiction before installation.
Be sure that power supply has been turned o󰀨 before
beginning installation. This controller should be used
only as described in this manual.
Tools Needed
#2 Phillips screwdriver
Slotted precision screwdriver
Level
1/8” wall anchor tools
Controller Placement
Avoid installing local controller in high load or heat
loss areas such as exterior walls or walls that are
against unconditioned spaces, near entry doors
and windows, or where direct sunlight may be
present.
CAUTION
To ensure proper system performance and reliabil-
ity, Lennox does not recommend operation of VRF
systems during any phase of construction. Con-
struction debris, low temperatures, harmful vapors,
and operation of the unit with misplaced lters can
damage the units. Failure to follow these guide-
lines will result in the warranty being voided.
Shipping and Packing List
Package 1 of 1 contains;
1 – Wired Controller
1 – Back plate and Wire Terminals
2 – Mounting screws and anchors
2 – Machine screws for connecting controller to
back plate
IMPORTANT
Frequent changes to operating mode may cause
system malfunction. Allow at least one minute
between mode changes to allow the system to
stabilize.

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• This manual provides the installation instructions for
this controller. Refer to the included wiring diagrams
to connect the controller to the indoor unit.
• Do not expose to volatile organic compounds
(V.O.C.) and/or alcohol that can cause sensor dam-
age.
• Do not expose to construction dust, paint, and/or
other contaminants that can deposit on the circuit
board surface inside the unit.
• Physical damage can lead to broken cover glass as
well as prevent the unit from functioning correctly.
• The controller uses low voltage. Keep a minimum
distance of 12” (305 mm) between low voltage con-
trol wire and high voltage power wires.
Power wiring between controller and rst indoor
unit:
• Minimum 18 AWG stranded, shielded cable up to
164 feet (50 m).
• Ensure there are no gaps between the controller
back cover and the mounting surface.
• Fill any holes in the wall behind the controller to
avoid false readings from inltration.
• Ground the shielded control wiring.
• Do not use a megger to test insulation.
Communication wiring between indoor units:
• Minimum 18 AWG stranded, shielded cable.
Installation
CAUTION
Do not install controller in areas where harmful
gases containing sulfur or other damaging agents
may exist or the controller may be damaged.
Clean controller using a clean, damp cloth. Do not
spray cleanser on or around controller.
Be sure that power supply has been turned o󰀨 be-
fore beginning installation.
Do not operate controller with wet hands.
WARNING
IMPORTANT
Read all of the information in this manual before us-
ing this controller. All wiring must conform to local
and national building and electrical codes and ordi-
nances. This is a 12 VDC controller. Do not install
on voltages higher than 12 VDC.
IMPORTANT
Electrostatic discharge can a󰀨ect electronic
components. Take precautions to neutralize
electrostatic charge by touching your hand and
tools to metal prior to handling the control.

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Figure 1. Connect to P3 Indoor Unit
-12V +12V
HB
HA
NOTE - 1. Connect up to 16 indoor units
2. Ground cable shielding at indoor unit
3. All wiring is polarity sensitive
COM 12V
HB
HA
Connecting to a Single P3 Indoor Unit
Connect the controller to an indoor unit using Control Protocol 3, or P3, using 4-conductor wire to terminals
+12V,-GND,HA,HB. See Figure 1.

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Figure 2. Connect Controller to Multiple Indoor Units Wiring Connections
Connecting to Multiple Indoor Units
Connect the controller to multiple indoor units, up to 16. Use 4-conductor shielded cable to connect to the rst
indoor unit, then daisy chain control wiring to each indoor unit using the HA/HB terminals in the electrical con-
trol box of the indoor unit. Do not daisy chain 12V power cable. See Figure 2.
NOTE – All of the indoor units connected to the controller must be on the same refrigerant circuit, connected
to the same outdoor unit.
CAUTION
Connect “12V” on the controller to terminal “12V” on
the rst indoor unit only. 12V connection provides
power to controller; connection to multiple indoor
units will damage controller and indoor unit boards.
NOTES - 1. Connect “+12V” on the controller to terminal “+12V” on the first indoor
unit only. 12V connection provides power to controller; connection to
multiple indoor units will damage controller and indoor unit boards.
2. Ground cable shielding at each indoor unit.
4. Use stranded, shielded, 18 GA cable.
5. Connect up to 16 indoor units.
COM 12V
HB
HA
COM 12V
HB
HA
COM 12V
HB
HA COM 12V
HB
HA

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1. Attach the back cover to the wall using screws.
2. Connect the controller to one indoor unit main
control board using appropriate wiring method
as determined.
3. Push the controller back toward the back plate
until it “snaps” into place, use machine screws
to secure cover to back plate.
Mount the Controller
Figure 3. Back Plate

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Operation
Main Menu
To access the main menu, tap the mode (HEAT, COOL,
or OFF) on the top right corner of the screen.
The main menu allows for quick access to changing
modes, fan operation, and other settings if enabled by
the system operator.
Depending on your HVAC system, some options may
be disabled and not displayed.
When the system is actively cooling or heating the
space, an underline will appear below the HEAT/
COOL indicator on the main screen. The line will
disappear during the system is idle or when the set-
point is satised.
Settings Menu
To access this menu, tap settings in the main menu.
This menu allows for changing of the temperature unit,
time format, and access to the schedule hold menu.
Factory Reset: A reset switch is hidden behind the rst
grill on the top right (see image below). Use a non-
metal tool to contact and press the reset switch.
Single Press: A single press of the switch will reboot
the device without changes to the stored information.
Long Press (Factory Reset): Holding the switch down
for more than ve seconds will put the device in factory
reset.
A visual indication is shown on the screen.
Note: Factory resets do not erase network information
and the device will remain on the network until a leave
operation is performed (via the network menu or over
the air).
Figure 4. Factory Reset Button

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Technical Support
1-800-4LENNOX
(1-800-453-6669)
[email protected]
www.LennoxCommercial.com
Scan this QR code to download the Lennox VRF & Mini-Splits App
from the Apple App Store or the Google Play store.
The app contains technical literature and troubleshooting resources.
Scan this QR code to download the Lennox VRF Wi-Fi
Controller App
from the Apple App Store or the Google Play store.
The app provides control of the VRF Wi-Fi Controller.