Jackson Systems Limit Stat LSL-HCB User manual

Installation Manual

Models

LSL-HCB

LSL-HCW

Limit Stat™ is designed to prevent the

user from adjusting the temperature

beyond a specific heating and cooling

limit, thereby greatly reducing utility

bills.

This installation manual covers both

the LSL-HCB single stage, heat / cool

battery powered and the LSL-HCW

single stage, heat / cool hardwired

Limit Stat™.

Digital, non-programmable

Gas / Electric blower fan operation

Set temperature range (45° to 90° F)

Clean attractive design

Application

Features

Compatible Equipment

Output Terminals

Fan Operation

Display

Control Power

Enclosure

Dimensions

Limited Warranty

Single stage, gas, oil or electric heating and air

conditioning systems, Millivolt systems or single

stage heat pumps

LSL-HCB: G, W, Y, RH, RC, O/B

LSL-HCW: G, W, Y, RH, RC, O/B, C

Gas or electric

Green backlit LCD

LSL-HCB: 2 AA alkaline batteries (Included)

LSL-HCW: 24VAC, 2.4VA

Molded ABS plastic

3.25” x 5” x 1” (WHD)

1 Year

Limit

STATTM

Specifications

Large, backlit, easy-to-read LCD

Built-in short cycle compressor

Adjustable setpoint limits

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.

Mounting the Subbase

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.

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.

Limit Stat™

B/O

Use a properly sized screwdriver and land each

wire to its dedicated terminal as illustrated in

Section 4.

Check to ensure that all wires are landed

correctly and dressed properly to prevent any

shorts.

GFAN

W1 HEAT

Y1 COOL

RH 24V HEAT (HOT)

RC 24V COOL (HOT)

B/O REVERSING VALVE

(HEAT PUMP ONLY)

C 24V (COMMON)

GFAN

W1 HEAT

Y1 COOL

RH 24V HEAT (HOT)

RC 24V COOL (HOT)

B/O REVERSING VALVE

(HEAT PUMP ONLY)

If system has a single 24V transformer, leave

factory jumper between RH and RC.

If system has a separate heating and cooling

transformer, remove factory jumper and wire RH

to heating transformer and RC to cooling

transformer. For LSL-HCW models, wire C to

only one 24V transformer common.

Do not over tighten the terminal

screws.

Model LSL-HCB (Battery Powered)

Model LSL-HCW (Hardwired)

Heat / Cool Systems

Terminal Designations

Typical Wiring Diagrams

B/O

24V Common (LSL-HCW Only)

Fan

Heat (Not used for cooling only system)

Cool (Not used for heating only system)

24V Heating Transformer (Hot)

24V Cooling Transformer (Hot)

Single Stage Heat Pump Systems

For single stage heat pumps, jumper W1 to Y1

and wire Y1 to the heat pump compressor Y

terminal. The heat pump reversing valve is

configured using one the jumpers located inside

the thermostat. (See Setup Options)

When using the LSL-HCB 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 System Furnace Heat Pump

JP2 Display Fahrenheit Celsius

JP3 Fan Gas Electric

JP4 Rev Valve O B

JUMPER TABLE UP DOWN

JP1 - System

JP2 Fahrenheit or Celsius Display

JP3 - Gas or Electric

JP4 - Reversing Valve

This jumper is used to select conventional

furnace or heat pump system.

This jumper is used to select degrees F or C

which will be displayed on the LCD.

This jumper is used to select fan operation for

either gas or electric HVAC systems.

This jumper is used to select the reversing valve

for single stage heat pump systems.

O = Reversing valve energized on a call for

cooling.

B = Reversing valve energized on a call for

heating.

Once all optional jumper settings have been

made, replace the batteries if using model LSL-

HCB. 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.

Turn power back on to HVAC system.

The MODE switch has three positions: HEAT,

OFF and COOL. Set the MODE switch to HEAT

to control the heating system. Set the MODE

switch to COOL to control the air conditioning.

When the MODE switch is set to OFF, no

heating or cooling will take place.

The FAN switch has two positions; AUTO and

ON. In the AUTO position, the fan will only run

when there is a call for heating or cooling.

In the ON position, the fan will run continuously,

even if the Mode switch is in the OFF position.

When the Limit Stat™ is in the HEAT or COOL

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.

Mode Switch

Fan Switch

Temperature Change Buttons

Completing Installation

24V Common (LSL-HCW Only)

Fan

Cool

24V Transformer (Hot)

B/O

Add jumper wire between W1 and Y1

Heat Pump Reversing Valve

Setup Options

System Switches

5418 Elmwood Avenue, Indianapolis, IN 46203-6025

Toll Free: 888.652.9663 Fax: 317.227.1034

www.jacksonsystems.com

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.

Under normal use, the Limit Stat™ requires no

special maintenance. The LSL-HCB, 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 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.

Jackson Systems, LLC 2010

Intellectual rights apply.

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.

Important Installation Notes

06-1057-033010

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