Limit
STAT
Installation Manual
TM
Application
Limit Stat™ is designed to prevent the
user from adjusting the temperature
beyond a specific heating and cooling
limit, thereby greatly reducing utility
bills.
O
This installation manual covers both
the
LSL-HPB 2 heat / 1 cool heat pump
battery powered and the LSL-HPW
2 heat / 1 cool heat pump hardwired
Limit Stat™.
Features
Digital, non-programmable
Up to 2 heat / 1 cool heat pump
Models
LSL-HPB
LSL-HPW
Set temperature range (45° to 90° F)
Clean attractive design
Large, backlit, easy-to-read LCD
Built-in short cycle compressor
Adjustable setpoint limits
Specifications
Compatible Equipment
Heat pump systems with up to 2 stages of heating and
1 stage of cooling. Auxiliary and emergency heat
operation. O or B reversing valve configurable.
Output Terminals
LSL-HPB:
LSL-HPW:
Fan Operation
Fan energized on a call for heating or cooling
Display
Green backlit LCD
Control Power
LSL-HPB:
LSL-HPW:
Enclosure
Molded ABS plastic
Dimensions
3.25” x 5” x 1” (WHD)
Limited Warranty
1 Year
Y1, E, G, R, B/O, W2
Y1, E, G, R, B/O, W2, C
2 AA alkaline batteries (Included)
24VAC, 2.4VA
Limit Stat™
Use a properly sized screwdriver and land each
wire to its dedicated terminal as illustrated in
Section 4. Do not over tighten the terminal
screws.
Check to ensure that all wires are landed
correctly and dressed properly to prevent any
shorts.
1
Thermostat Location
Turn off power to HVAC system.The Limit
Stat™ should be installed in a location that
represents the ambient space temperature. Do
not install the thermostat in an area where drafts
are present, near the floor, behind doors or on
an external wall. Avoid placing the thermostat in
areas where the air movement is limited,
affected by direct sunlight or other areas not
typical of the temperature in the space.
3
Terminal Designations
Model LSL-HPB (Battery Powered)
W2
B/O
R
G
E
Y1
2
Mounting the Subbase
Auxiliary Heat
Reversing Valve
24V (HOT)
Fan
Emergency Heat
Compressor
Model LSL-HPW (Hardwired)
When mounting the subbase, be aware that
drafts may travel down wall cavities and enter
the back of the thermostat through the control
wire hole in the wall. It is important to seal the
hole to prevent any drafts that might affect the
internal temperature sensor.
C
W2
B/O
R
G
E
Y1
24V (COMMON)
Auxiliary Heat
Reversing Valve
24V (HOT)
Fan
Emergency Heat
Compressor
4
Typical Wiring Diagram
C
W2
C
Y2
W2
B/O
24V Common (LSL-HPW Only)
Auxiliary Heat
Y2
R
G
E
Y1
Pull the control wires through the large opening
in the thermostat subbase then level and mount
the subbase on the wall using the supplied
anchors and screws. Do not over tighten the
mounting screws as the subbase may warp
causing improper seating of the thermostat
connecting pins to the terminal block.
B/O
Reversing Valve
R
24V Hot
G
Fan
E
Emergency Heat
Y1
Compressor
For heat pump systems that do not have a
dedicated E (Emergency Heat) terminal, install
a jumper wire from E to W2. This will allow the
thermostat to energize the auxiliary heat and
lock out the compressor when the mode switch
is set to EMER.
2
The heat pump reversing valve is configured
using one the jumpers located inside the
thermostat. (See Setup Options)
7
System Switches
5
Mode Switch
Setup Options
The MODE switch has four positions: EMER,
HEAT, OFF and COOL. Set the MODE switch is
When using the LSL-HPB battery powered Limit
Stat™, the batteries must be removed before
changing any jumper settings. Wait at least two
minutes after removing the batteries before
changing a jumper or the change will not be
recognized by the thermostat.
JP1
JP2
Display
Rev Valve
UP
..
.
Fahrenheit
B
the MODE switch to COOL to control the air
conditioning. When the mode switch is set to
OFF, no system heating or cooling will take
place. When the mode switch is set to EMER,
DOWN
only the auxiliary (emergency) heat is energized
.
..
JUMPER TABLE
set to HEAT to control the heating system. Set
and the compressor is locked out. In normal
HEAT mode, auxiliary heat is energized with the
Celsius
O
compressor when the demand is greater than
the first stage of heating can accommodate.
When auxiliary heat is activated, “AUX” is
JP1 - Fahrenheit or Celsius Display
This jumper is used to select degrees F or C
which will be displayed on the LCD.
displayed on the LCD.
Fan Switch
JP2 - Reversing Valve
This jumper is used to select the reversing valve.
The FAN switch has two positions; AUTO and
ON. In the AUTO position, the fan will only run
O = Reversing valve energized on a call for
cooling.
when there is a call for heating or cooling. In the
ON position, the fan will run continuously, even if
B = Reversing valve energized on a call for
heating.
the MODE switch is in the OFF position.
Temperature Change Buttons
When the Limit Stat™ is in the HEAT or COOL
6
mode, a single press on either the UP or DOWN
button will cause the LCD to display the word
Completing Installation
SET. Once SET is displayed, the setpoint value
Once all optional jumper settings have been
made, replace the batteries if using model LSLHCB. Install the thermostat on its subbase with
the bottom tilted out. Line up the two holes at the
top with the two hooks on the subbase. Slowly
pivot the bottom of the thermostat towards the
subbase and push firmly until it is securely
latched. Do not attempt to force the two halves
together.
Remove the plastic film (if present) that is
protecting the LCD display.
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.
Turn power back on to HVAC system.
3
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.
8
Short Cycle Protection
The Limit Stat™ has built-in short cycle protection
designed to prevent compressor damage due to
rapid switching of modes or momentary power
outages. Short cycle time delays are fixed at 5
minutes on and 5 minutes off.
9
10
Maintenance
Important Installation Notes
Under normal use, the Limit Stat™ requires no
special maintenance. The LSL-HPB, 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.
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.
5418 Elmwood Avenue, Indianapolis, IN 46203-6025
Toll Free: 888.652.9663 Fax: 317.227.1034
www.jacksonsystems.com
4
06-1059-033010
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