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Wiring Diagrams
4-wire Heat/Cool System
OPERATION
Start-up
The LCD will show the factory default dis-
play of 70°F (21°C) when batteries are first
installed, or after the Reset button is pressed.
The temperature will update after a few sec-
onds.
System Selector Switch
The System Selector switch on the front of the ther-
mostat determines
the operating mode of the thermostat. You may select
COOL, OFF, HEAT.
NOTE: Anytime you install or remove the thermostat
from the wallplate, slide the System Selector to the
OFF position to prevent the possibility of a rapid sys-
tem On-Off.
Fan Switch
The Fan switch should normally be located in the AUTO
position. The Fan will be turned on along with normal
operation of your system. In a normal gas or oil fur-
nace, the Fan will be turned on by your furnace after
its warm-up delay. For electric heat, air conditioning,
and heat pump operation, the Fan will turn on with
the system.
To run the Fan on continuously, slide the Fan switch to
the ON position.
Review Current Set Temperature
• Press either the up or down key for less than 1 second to see the Set
Temperature.
The factory default is 68°F (20°C) when started with the System Switch
Off or Heat, and 78° (26°C) when started with the System Switch on
Cool.
Setting New Temperature
• Press either the up or down key and hold for longer
than 1 second.
• The display will flash to
show that you are in Set
Temperature mode, then
you can release the key.
• Press either up or down
again to change to your desired Set Temperature.
Hold the key down for over 2 seconds to fast-ad-
vance the Set Temperature.
The display will return to the normal room tempera-
ture after the keys have been released for 3 seconds.
Filter Monitor
The thermostat counts the number of hours your system’s filter has
been in use. To maximize your system’s performance and energy effi-
ciency, change or clean your filter regularly.
When the total system run time for heat and
cool reaches 400 hours, the Filter Change
Indicator will flash as a reminder to check
your system’s filter.
After changing or cleaning the system filter,
press and hold the Filter key for 3 seconds.
The display will blink, and the counter will be reset to zero.
Note: Pressing the Filter key at any time for less than 3 seconds will
cause the Filter Change Indicator to appear on the LCD. This is only to
confirm key operation, and the counter is not affected unless the key
is held for greater than 3 seconds.
SPAN Setting
Your thermostat is set at the factory to cycle at 1°F (0.5°C) above and
below the set temperature. (Span = 2) This setting has been designed
to provide a comfortable room temperature under most all conditions.
However, if you find your system cycling too fast or too slow, then the
Span can be adjusted to modify the cycle time.
• Press and hold BOTH for three seconds. The display
will flash, and SPAN will be displayed on the LCD.
• Press to raise the Span to 3. This setting INCREASES
the cycle time by allowing your system to run
LONGER.
• Press to lower the Span to 1. This setting DECREASES
the cycle time by causing your system to run
SHORTER.
The Span settings remain the same for both HEAT and COOL, and can
be changed in any System Switch position.
When batteries are installed in the thermostat, or the Reset key is
pressed, the Span is reset back to setting 2.
Backlighting (INDIGLO
®
Night-Light)
Your thermostat has an electroluminescent lamp that backlights the
display for easy viewing in the dark.
When any key is pressed or the System Switch is changed, the display
is illuminated.
The display will remain illuminated for 5 seconds after the last key is
pressed. This allows the light to stay on if you need to operate several
keys.
Note: If the thermostat is in Low Battery warning condition, the back-
light will not operate. Replace with 2 new AA alkaline batteries to
restore the Backlight function.
Low Battery Warning
Your thermostat has a two-stage low battery
warning system. When the batteries are first
detected to be weak, the first stage low bat-
tery warning is indicated by battery symbol
flashing on the LCD display. At your earliest
convenience, you need to replace the batter-
ies with 2 new AA alkaline batteries.
When the batteries become too weak for
normal operation, the thermostat enters the
second stage low battery warning which
shuts down the thermostat. In this condition,
“BATT” flashes alone on the display, and the
thermostat will turn your system Off. Your
system will remain shut-off until the batter-
ies are replaced.
Note: The thermostat will still keep the current Set Temperature and
Filter run time in memory until new batteries are installed. After con-
firming that new batteries have been inserted, the thermostat will
return to normal operation.
Error Mode
If the thermostat is unable to control your
system due to an unexpected battery prob-
lem, the thermostat will enter Error Mode.
In this condition, the thermostat flashes
“Er” on the LCD display, and shuts off your
system.
To correct this problem, replace the batteries with 2 new AA alkaline
batteries, even if you have recently replaced them. Next, use a paper
clip to press the RESET button next to the keypad. You will need to
reprogram your thermostat and confirm normal operation.
If Error Mode returns, please call Technical Support at 1-800-676-7861
for further information.
Auto Cut Off
Your thermostat will automatically cutoff in Heat mode if the room
temperature rises above 95°F (35°C). It will cutoff in Cool mode if the
room temperature drops below 45°F (7°C).
Note that if your system has malfunctioned and no longer responds to
thermostat controls, the Auto Cut-Off will have no effect.
Mechanical Heat Backup
This thermostat includes a bimetal switch that will automatically turn
on the Heat when the temperature reaches about 41° F (5° C).
WARNING: This switch only activates the Heating terminal (W).
The system itself must be capable of automatically turning the
Fan On. Without normal Fan operation, severe damage to the
heating system could result.
X - No Connection
Selector Switches
In order for this thermostat to control your system, the system type
must be specified by the selector switches on the printed circuit board
inside the thermostat. There is also a selector switch for your choice of
Fahrenheit or Celsius temperature display.
• Heating System Selector (HG - HE switch)
The factory position for this switch is in the “HG” position. Leave it
in this position if you have a gas furnace or an oil burner. If you
have an electric furnace, test to see whether the Heat and Fan come
on as expected after installation. If the Fan operation is normal,
leave it in the “HG” position. If the Fan does not come on within a
minute of the thermostat calling for heat, change the switch posi-
tion to “HE”. The system selector has no effect in the cooling mode.
NOTE: “HG” position is for gas and most other systems. “HE” posi-
tion is for certain electric systems having a fan relay.
• System Selector (STANDARD - HEAT PUMP switch)
The factory position for this switch is in the STD position. Leave it in
this position if you have ANY system that uses gas, oil, electric, or
hot water heating. If you have a single-stage Heat Pump (no auxil-
iary or emergency heat source), then slide the switch to the HP
position. Be sure the reversing valve wire is connected to the correct
terminal for your heat pump (Rc/O) or (Rh/B).
• F° / C° selector (Fahrenheit / Celsius)
Your thermostat is set for F° mode from the factory. In order to
change to C° mode, slide the switch to C° and press the reset but-
ton on front of the thermostat with a paper clip.
NOTE: Unless the reset button is pressed, the thermostat will not
change temperature mode.
3-wire Heat Only System
3-wire Cool Only System
2-wire Heat Only System
5-wire Heat/Cool System
Single-stage Heat Pump System
Connect to Proper Reversing
Valve Terminal. See Table A
Figure 6
Temperature
Display
(SW4)
Fan Option
(SW3)
System
Selector
(SW6)
Problem
No Display.
Entire Display Dims.
Auto Fan Does Not Turn
On Properly.
Heating or Cooling Does
Not Go On or Off.
Erratic Display.
If unit continues to operate
in the Off position.
Thermostat permanently
reads “HI”, “LO”, or “Er”.
Solution
1. Check battery connections and
batteries.
2. Press RESET button with a small pin
and hold in for two seconds.
If you experience any other problems, call 1-800-676-7861 from 8 AM
to 5 PM Central Time for technical assistance.
1. Replace Batteries.
1. Move HG/HE selector to correct
position.
1. Check that the function switch is in
the correct position (“HEAT” or
“COOL”).
2. There may be as much as 4-minute
delay before the system turns On -
wait and check. (Compressor
protection delay.)
3. Check your circuit breakers and
switches to ensure there is power
to the system.
4. Replace batteries.
5. Make sure your furnace blower
door is closed properly.
6. If your non-heat pump system only
uses 4-wires, be sure the jumper
wire is installed between the Rh/B
and Rc/O terminals.
7. Check the position of the Reversing
Valve selector switch: Standard or
Heat Pump.
8. If you have single-stage heat pump,
be sure the jumper wire is installed
between the Y and W terminals.
1. Press the reset button once with a
small pin and hold for two seconds.
Then reprogram.
1. Replace unit.
1. Replace unit.
41496-01 03/26/2003
© 2003, Climate Technology Corp.
Climate Technology Corp.
2500 Frisco Avenue
Memphis, TN 38114
A Hunter Fan Company
TROUBLESHOOTING
Wallplate
Terminals
Jumper
System
Selector
STD
HP
Fan
Relay
Compressor
Contactor
Reversing
Valve
24V
Supply
ORHeat
Mode
Cool
Mode
Wallplate
Terminals
Jumper
System
Selector
STD
HP
Heat Relay
or Valve
Heat 24V or
Millivolt Supply
Wallplate
Terminals
Jumper
System
Selector
STD
HP
Fan
Relay
Heat Relay
or Valve
Heat 24V
Supply
Wallplate
Terminals
Jumper
System
Selector
STD
HP
Fan
Relay
Cool 24V
Supply
Cool
contactor
Wallplate
Terminals
Jumper
System
Selector
STD
HP
Fan
Relay
Cool
Contactor
Heat Relay
or Valve
Heat/Cool
24V Supply
Wallplate
Terminals
System
Selector
STD
HP
Fan
Relay
Cool 24V
Supply
Cool
contactor
Heat Relay
or Valve
Heat 24V
Supply
No Jumper