Lennox VRF F1943L-3P Installation instructions

The F1943L-3P (19B16) is a wired local touchscreen
controller for VRF Heat Recovery, VRF Heat Pump and
Mini-VRF Systems.
Remote control via Wi-Fi is available with the free VRF
Controller App. See page 7.
NOTE - Refer to the Controller Installation Instructions and
the App User Manual for additional information.
Touchscreen Display
• 4 in. capacitive touchscreen with full color LCD display
and intuitive navigation
• Screen is illuminated when touched and remains lit
during control access
Dimensions
• 3-5/8 x 5 x 7/8 in. (H x W x D)
• Wallplate and additional hardware is furnished for
installation
Wiring
• Controller uses low voltage 4-wire 18AWG shielded cable
(not furnished) for easy connection to the indoor unit
Grouping
• Controller can control up to 16 indoor units on the same
system
F1943L-3P
Touchscreen Wi-Fi Controller
60 Hz
Bulletin No. 210967
July 2023
Supersedes April 2022
VARIABLE REFRIGERANT FLOW SYSTEMS
COMMERCIAL
PRODUCT SPECIFICATIONS
VRF
F1943L-3P TOUCHSCREEN WI-FI CONTROLLER
CONTROLLER USER SETTINGS
HOME SCREEN (Thermostat ON) Notes
Touch blank screen to turn on the backlight
if brightness setting is set to 0%.
ACTUAL TEMPERATURE DISPLAY Touch the MODE button on the upper-right
of the home screen to access the Main
Menu screen.
UP/DOWN ARROWS ADJUST
TEMPERATURE
62°F to 86°F
TEMPERATURE “SET TO” DISPLAY
RELATIVE HUMIDITY DISPLAY
MODE HEAT
COOL
OFF

F1943L-3P Wi-Fi Programmable Controller / Page 2
CONTROLLER USER SETTINGS
MAIN MENU SCREEN Notes
SETTINGS (Gear Icon) Touch the gear icon on the upper-right of the
screen to access the Settings screen. See
page 2.
SYSTEM MODE OFF Touch a button to switch unit operation.
HEAT
COOL
AUTO
DRY
FAN OPERATION
(ALWAYS ON)
ON
OFF
FAN SPEED LOW
MED
MAX
AUTO
SETTINGS SCREEN Notes
FAHRENHEIT / CELSIUS
TEMPERATURE
ON Touch button to switch between Fahrenheit
(default) and Celsius.
OFF
NETWORK Touch to set up network connection. Refer
to the VRF Wi-Fi Controller Mobile App
User Manual for complete Wi-Fi setup
instructions. See page 7.
DISPLAY BRIGHTNESS 0 to 100% Touch to adjust brightness.
0% setting turns off screen after 30
seconds.
ADDITIONAL SETTINGS Touch to access Additional Setting screen.
See page 3.

V0STAT51P-3 Wi-Fi Programmable Controller / Page 3
CONTROLLER USER SETTINGS
ADDITIONAL SETTINGS SCREEN Notes
SERVICE MENU Touch to access Service Menu screen, see
page 3. Passcode protected.
INFO SCREEN Displays controller information (rmware,
etc.).
REBOOT DEVICE BUTTON Reboots Controller
SERVICE MENU SCREEN (Passcode Required) Notes
ARTIFICIAL CALIBRATION -5°F to 5°F Touch to adjust temperature.
AUXILIARY HEAT SETUP Touch for Aux Setup screen. See page 3.
CHANGE PASSCODE Touch to change passcode. Enter a new
passcode (4 digits). Touch Save to store.
INDOOR UNIT SETTINGS Touch for Indoor Unit Settings screen. See
page 6.
AUXILIARY HEAT SETUP Notes
NONE
ELECTRIC HEAT IDU/DUCTING Touch to select Heating type. Touch Next to
go to the Aux/Alt Heat Options screen. See
page 4.
GAS HEAT
OTHER HEAT

F1943L-3P Wi-Fi Programmable Controller / Page 4
CONTROLLER USER SETTINGS
AUX/ALT HEAT OPTIONS SCREEN Notes
VRF is PRIMARY HEAT SOURCE ON (default) Touch button to switch.
OFF
VRF is AUXILIARY HEAT ON Touch button to switch.
OFF (default)
SET SWITCHOVER TEMPERATURE Touch for Set Switchover Temperatures
screen. See page 5.
SET FAN OPTIONS The Set Fan Options screen displayed is
dependent on the heat type selected.
See Aux Heat Fan Options screen for Electric
Heat on page 4.
See Alt Heat Fan Options screen for Gas Heat
or Other on page 5.
AUX HEAT FAN OPTIONS SCREEN Notes
This screen is for Electric Heat fan settings.
FAN OPERATION THERMO Touch to switch.
ON
FAN SPEED LOW Touch to switch.
MED
HIGH

V0STAT51P-3 Wi-Fi Programmable Controller / Page 5
CONTROLLER USER SETTINGS
ALT HEAT FAN OPTIONS SCREEN Notes
This screen is for Gas Heat or Other Heat
source fan settings.
FAN OPERATION OFF Touch to switch.
THERMO
ON
FAN SPEED LOW Touch to switch.
MED
HIGH
SWITCHOVER TEMPERATURES SCREEN Notes
SET AUX/ALT DELTA TEMPERATURE –20°F to 0°F Touch to adjust temperature.
SET SWITCHOVER TEMPERATURE –8°F to 80°F Touch to adjust temperature.

F1943L-3P Wi-Fi Programmable Controller / Page 6
CONTROLLER USER SETTINGS
INDOOR UNIT SETTINGS SCREEN Notes
STATIC PRESSURE SETTING 0.00 to 1.00 in. w.g. Touch up/down arrows to adjust. Touch
Save button to store.
SWING SETTINGS Vertical Swing Settings Touch to set Swing Settings. See page 6.
Horizontal Swing Settings
SET INDOOR UNIT ADDRESS 1 to 16 Touch up/down arrows to adjust. Touch
Save button to store.
TEMPERATURE SENSOR USE Controller (default) Touch to switch.
Individual Indoor Unit
SWING SETTINGS SCREEN Notes
VERTICAL SWING SETTINGS Swing Touch Swing to activate up/down louver
operation. Louvers oscillate up and down
automatically.
Touch a Position number to set the louvers
at one of ve different xed airow angles.
Pos1
Pos2
Pos3
Pos4
Pos5
HORIZONTAL SWING SETTINGS ON Touch to activate left/right louver operation.
Louvers swing left and right automatically.
OFF
Reset Button
• Reset button is hidden behind the rst grill on the top right of
the controller.
• Single Press - Reboots the controller without changes to the
stored information.
• Long Press - Holding the switch down for more than Five
Seconds enables a factory reset.
NOTE - Factory reset does not erase network connection
information.

V0STAT51P-3 Wi-Fi Programmable Controller / Page 7
Power
Press and Hold to turn the
indoor unit on or off.
Setpoint Adjustment
Slide Up or Down to adjust
the setpoint for the currently
selected mode of operation.
To set the setpoints for Auto
mode, select each Cooling and
Heating setpoint separately
and set the setpoints for each
one, then select Auto Mode.
Room Temperature Display
Displays the temperature of
the temperature sensor in the
controller.
Mode Selection
Indoor unit mode of operation
(Heat/Cool/Auto).
Displays the mode of
operation and setpoint for
each mode. When in Auto
mode, each mode of operation
will display its own setpoint.
Relative Humidity Display
Displays the relative humidity
reading of the humidity
sensor in the controller (not
adjustable).
Fan Speed Selection
Indoor unit fan speed
(Low/Med/High/Auto).
MOBILE APP CONTROLLER SCREEN SETTINGS
MOBILE APP
The free VRF Controller app is available for use on
iPhone®and iPad®, Android™ devices.
Control cooling/heating temperatures, operating mode,
fan operation and power for multiple units.
Allows remote control of VRF systems directly from a
smartphone. The intuitive design gives you direct control
over your system and comfort control, all in an easy-to-
use layout.
NOTE - Refer to the VRF Wi-Fi Controller Mobile App User
Manual for complete Wi-Fi setup instructions.
Apple, the Apple logo, iPhone and iPad are trademarks of Apple Inc. registered in
the US and other countries.
Android is a trademark of Google Inc. Use of this trademark is subject to Google
permission.

NOTE - Due to Lennox’ ongoing commitment to quality, Specications, Ratings and Dimensions subject to change without notice and without incurring liability.
Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury.
Installation and service must be performed by a qualied installer and servicing agency. ©2023 Lennox Industries, Inc.
Visit us at www.Lennox.com
For the latest technical information, www.LennoxCommercial.com
Contact us at 1-800-4-LENNOX
REVISIONS
REVISIONS
Sections Description of Change
Document Additional features added.