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Single Stage Heat Pump Systems
C
24V Common (LSL-HCW Only)
G
Fan
W1
W2
Add jumper wire between W1 and Y1
Y2
Y1
Cool
RH
24V Transformer (Hot)
RC
Heat Pump Reversing Valve
B/O
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)
5
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.
JUMPER TABLE
JP1
System
JP2
Display
Fahrenheit
JP3
Fan
JP4
Rev Valve
JP1 - System
This jumper is used to select conventional
furnace or heat pump system.
JP2 Fahrenheit or Celsius Display
-
This jumper is used to select degrees F or C
which will be displayed on the LCD.
JP3 - Gas or Electric
This jumper is used to select fan operation for
either gas or electric HVAC systems.
JP4 - Reversing Valve
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.
UP
DOWN
. .
.
Furnace
Heat Pump
Celsius
Gas
Electric
O
B
6
Completing Installation
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.
7
System Switches
Mode Switch
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.
Fan Switch
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.
Temperature Change Buttons
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.
3
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