2
Thermostat should NOT be mounted:
S
Close to a window, on an outside wall, or next to a door
leading to the outside.
S
Exposed to direct light and heat from the sun, a lamp,
fireplace, or other heat--radiating object which may cause
a false reading.
S
Close to or in direct airflow from supply registers and
return--air grilles.
S
In areas with poor air circulation, such as behind a door
or in an alcove.
Step 2 — Install Thermostat
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing thermostat, turn off all power to unit. There
may be more than 1 disconnect.
!
WARNING
1. Turn OFF all power to unit.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat, one at a
time. Be careful not to allow wires to fall back into wall.
c. As each wire is disconnected, record wire color and
terminal marking.
d. Discard or recycle old thermostat.
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Mercury is a hazardous waste. Federal regulations require that
Mercury be disposed of properly.
CAUTION
!
3. Separate front and back plastic assembly of thermostat.
4. Route thermostat wires through hole in mounting base.
Level mounting base against wall (for aesthetic value only,
thermostat need not be level for proper operation) and mark
wall through 2 mounting holes.
5. Drill two 3/16--in. mounting holes in wall where marked.
6. Secure back plate to wall with 2 anchors and screws
provided making sure all wires extend through hole in
plastic.
7. Connect wires to proper terminal location on backplate.
8. Push any excess wire back into wall. Seal hole in wall to
prevent air leaks. Leaks can affect thermostat operation.
Any excess wire left inside thermostat casing may also
affect thermostat operation by interfering with airflow
across the temperature sensor.
9. Snap thermostat together making sure assembly is secure.
10. Turn ON power to unit.
On power up, depending on the thermostat model being used, the
LCD readout will display either AC for air conditioner model
(1--stage heat/1--stage cool) or HP for heat pump model (2--stage
heat/1--stage cool).
Step 3 — Set Thermostat Configuration
Configuration options enable the installer to configure the
thermostat for a particular installation.
These are not presented to the homeowner and therefore must be
properly set by the installer. Following is a list of the options
available, an explanation of their function, and their factory default
settings. Not all numbers are used in the Legacy Line--RNC Series
because not all options are available in this series.
Configuration Options -- Summary:
Option 01 -- Equipment type
Option 03 -- Fahrenheit/Centigrade
Option 04 -- Fan (G) on with W output
Option 10 -- Reversing valve
Option 13 -- Room air temperature offset
To Enter The Configuration Mode:
Press and hold the FAN key for about 10 seconds until the display
changes so that only two pairs of digits are showing. The
configuration
number,
now
01,
will
appear
in
the
setpoint/temperature location and the configuration setting will
appear in the clock location. The configuration number (left pair)
will be flashing which means it can be adjusted using the UP and
DOWN keys. To cause the opposite pair to flash (to be adjustable),
press the H/C key. Successive presses of the H/C key alternate
between the configuration number (left) and the configuration
setting (right). To exit the configuration mode, press the
HOLD/END key. If no key is pressed for 3 minutes, the
configuration mode will automatically exit, returning the
thermostat to normal operation.
Configuration Options -- Selection:
Option 01 -- Equipment type
Selections: with HP thermostat: HP or AC
with AC thermostat: AC
HP controls 1 speed heat pump with 1 stage of aux heat.
AC controls 1 speed air conditioner with one stage of heat.
Note that this option allows a HP thermostat to be converted to
control an AC system.
Option 03 -- Fahrenheit/Centigrade
Selections: F = Fahrenheit — This is default.
C = Centigrade.
Selects temperature display units.
Option 04 -- Fan (G) ON with W output
Selections: OF = G not energized with W — This is default.
ON = G energized with W.
This selection determines whether the fan (G) is to be ON or OFF
when the W (furnace or strip heat) is ON. Furnaces and fan coils
which manage their own blowers do not require a separate G
signal. Some auxiliary heaters require a separate G signal to operate
the blower when W is applied.
This option allows a HP thermostat to control an AC system.
Option 10 -- Reversing valve
Selections: C = reversing valve energized in cooling —This is
default.
H = reversing valve energized in heating — Only
appears in HP systems.
Option 13 -- Room Air Temperature Offset
Selections: --5 to 5
_
F Default is 0.
The number of
_
F to be added to the displayed temperature to
calibrate or deliberately miscalibrate the measured room
temperature.
Step 4 — Understand Thermostat Operation
Temperature Display
Thermostat will display room temperature until UP or DOWN
button is pressed. The words SET TEMP appear when these
buttons are pressed and the current setpoint is displayed. If no
T1
--
PA
C
/T1
--
PH
P
