Flextherm LS120P User Manual

SUMMARY

OPTIONS SELECTION

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At the back of the thermostat, there are three selection switches to set at
your preferences.
Temperature in °C or °F, time in 12 or 24 hours and Early Start function.

TO SET TIME AND DAY

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Press on DAY, HOUR and MIN buttons to adjust time and day.
TO RECORD THE (COMFORT) SETPOINT TEMPERATURE
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Select chosen setpoint temperature by using
button (2 to 3 seconds) until icon appears on display.
TO RECORD THE (ECONOMY) SETPOINT TEMPERATURE
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Select chosen setpoint temperature by using
Press on button (2 to 3 seconds) until icon appears on display .

CHECKING GROUND FAULT CIRCUIT INTERRUPTER (GFCI)

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Adjust the setpoint temperature until heating indicator (
display. Press on TEST button. The test is conclusive if the warning light
(GFI) on thermostat is ON and power to the load is cut-off (
on display though). If these events do not occur, check the installation.
Press on RESET button to reset the GFCI.

OPERATING MODES

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To select an operating mode, use MODE button.
AUTO: Runs the program.
and can override temporarily your programming up to the
next program
MAN: Maintains the selected temperature.
the temperature setting.
1920 W (NI) @ 120 VAC

INSTALLATION

This thermostat is designed to control floor electric heating systems. The
resistive load must not exceed 1920 watts (NI) @ 120 VAC (16 A). The
thermostat is equipped with a ground fault circuit interrupter (GFCI) and therefore
the isolation of the line and load are required for operation. THE POLARITY OF
LINE CONNECTION (LINE AND NEUTRAL) MUST BE RESPECTED. DURING
A GROUND FAULT, ONLY THE CURRENT IN THE BLACK WIRE (LINE) OF THE
LOAD WILL BE CUT-OFF. CONNECT THERMOSTAT AS SHOWN ON
DIAGRAM.
This thermostat is an electrical product and must be installed in conformity with
the national and/or local Electrical Code. The installation must be performed by
qualified personnel where required by law.
This thermostat is designed to be used with a heating system with circuit breaker.

PARTS INCLUDED

- One (1) LS120P (120 VAC) thermostat
- Two (2) 6-32 screws
- Four (4) solderless connectors (for copper wire)
- One (1) Temperature sensor with a 4.5 meter (15 foot) extension
TURN OFF POWER OF THE HEATING SYSTEM AT THE MAIN POWER
PANEL TO AVOID ELECTRICAL SHOCK. Keep air vents of the thermostat clean
and free from obstructions.
LS120P
Programmable Electronic
Thermostat (120 volt s)
or button. Press on
or button.
) appears on
remain
or shows temperature setting
or changes
LS120P

1) Connecting wires and mounting thermostat

Connect the rear thermostat wires to the power supply and to the load using sol-
derless connectors for copper wires. See schematic diagram.
Push the excess wire back into the electrical box to prevent interference with
the thermostat. Secure the thermostat using two (2) 6-32 screws . Once the
thermostat is properly installed, return power to heating system.
NOTE: All cables and connections must conform to the local electrical code.
WARNING : Special CO/ALR solderless connectors must be used when
connecting with aluminum conductors.
120 VAC

2) Connecting temperature sensor wire

Connect the temperature sensor wire to the
two lower screws of the terminal block at
the back of the thermostat (no polarity need
to be respected). The wire must pass out-
side the electrical box and follow the wall
down to the floor. Install the sensor wire
between two runs of cable, at a distance of
30 to 60 cm (1 to 2 feet) within the heating
zone in a neutral location, away from any
source of heat or cold. Do not cross the
probe wire over the heating cable. Secure
the sensor to the floor with hot glue. It will
be necessary to recess the sensor in the
floor so it is at the same level as the heating
cable.

Power-up

When power is applied for the first time, the
LS120P
display must show the time 00:00, the floor
temperature and the manual mode icon (
1920 W (NI) @120 VAC
Other information might show up on the display if
installation is defective or does not comply with
the instructions. The warning light (GFI) must be
off.
The message L0 or HI will appear on the display
if the temperature sensor is defective or the
temperature is below 0 °C (32 °F) or higher than
60 °C (140 °F). Also, the heating indicator will be
present on display and the relay will be closed
(current going in the load).
Checking ground fault circuit interrupter (GFCI)
LS120P
1920 W (NI) @ 120 VAC
OPERATING MODES
The LS120P has two (2) operating modes.
M ( )
ANUAL
This mode allows you to maintain a constant temperature of the floor.
1- To activate this mode, press on Mode button to display the
2- Set the desired temperature using the
pre-programmed or or
(To select the setting, press on
AUTO ( )
MATIC
This mode executes your own programming.
To activate this mode, press on Mode button to display the
The or icon indicates which temperature setting is used. Also, the icon
of the program number will be shown.
920-111-025-00-1-B
120
VAC
60 HZ
Adjust the setpoint temperature until
heating indicator ( ) appears on
display. Press on TEST button. The test is
conclusive if the warning light (GFI) on the
thermostat is ON and power to the load is
cut-off. If these events do not occur, check
the installation. Press on RESET button to
reset the GFCI.
If the GFCI test fails:
Check the load wires. The thermostat
must be in heating mode to carry out the
test (heating indicator ON).
The GFCI test should be carried out
monthly. If the test fails, cut off the electric
power to the heating system and
customer service or return the thermostat
to your supplier for verification. If the
warning light comes on during normal
operation, cut off power to the heating
system and have an electrician verify the
installation.
icon.
buttons or select the
settings.
and simultaneously.)
LS120P0212A - Printed in China
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call
icon.
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