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Do not attempt to force the two halves 

together.
Remove the plastic film (if present) that is 
protecting the LCD display.

Turn power back on to HVAC system.

Mode Switch

The MODE switch has three positions: HEAT 

and OFF.  Set the MODE switch to HEAT to 

control the heating system. When the MODE 

switch is set to OFF, no heating or cooling will 

take place.

Fan Switch

The FAN switch is not used on the LSL-HCW.

Temperature Change Buttons

When the Limit Stat™ is in the HEAT mode, a 

single press on either the UP or DOWN button 

will cause the LCD to display the word SET. 

Once SET is displayed, the setpoint value will 

start flashing. The setpoint can now be 

changed by pressing or holding the UP or 

DOWN button. Pressing the UP or DOWN 

button will also illuminate the display for 

easier viewing in dim light conditions. The 

light will remain on for approximately 12 

seconds. 

Under normal use, the Limit Stat™ requires 

no special maintenance. The LSL-HOB, 

battery powered model requires that the 

batteries be replaced at least once per year or 

whenever the “LO BAT” symbol appears on 

the LCD.
To replace the batteries, release the 
thermostat from the subbase by pressing the 
thumb latch located at the bottom of the unit 
and swinging the thermostat up and away 
from the subbase. Remove the used batteries 
from the battery tray and discard 
appropriately. 

System Switch

5

6

Maintenance

Install two new AA Alkaline batteries into the 
battery tray. Match the battery direction with the 
polarity markings on the battery compartment 
to ensure proper operation. When finished, 
replace the thermostat on the subbase by 
lining up the two holes in the top of the 
thermostat with the two hooks on the top of the 
subbase. Slowly pivot the bottom of the 
thermostat towards the subbase and push 
firmly until the thermostat is securely latched to 
the subbase. Do not attempt to force the two 
halves together. 

This thermostat must be wired in accordance 
with all applicable local codes and ordinances.
The thermostat should be limited to a 
maximum of 1.5 amps. Higher current may 
cause damage to the thermostat.

This installation manual should not be left 
with unauthorized users as it contains 
installer setup functions which, if not 
correctly set, may cause damage to the HVAC 
equipment or seriously affect performance.

The Limit Stat™ thermostat is intuitive, reliable 
and easy to install. Using a common sense 
approach to the installation will ensure this 
product is installed properly and to the customer’s 
satisfaction. Please take time to read and 
understand this manual so that installation and 
testing is undertaken in an efficient manner.

Although great care has been taken in 
preparation of this manual, Jackson Systems 
takes no responsibility for errors or 
omissions contained herein. It is the 
responsibility of the installer to ensure that 
this thermostat and the equipment connected 
to it operate in a safe and efficient manner.

Due to ongoing product improvements, Jackson 
Systems reserves the right to change the 
specifications of the Limit Stat™ thermostat or its 
components without notice.

All rights reserved.

©

 Jackson Systems, LLC 2010

Intellectual rights apply.

7

Important Installation Notes

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