T1--PAC
T1--PHP
LEGACY LINE--RNC
PROGRAMMABLE THERMOSTATS
Installation Instructions
A07109
Legacy Line--RNC Series Programmable Thermostat
NOTE: Read the entire instruction manual before starting the
installation
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 1...................................
INSTALLATION CONSIDERATIONS 1...................
INSTALLATION 1....................................
Step 1 — Thermostat Location 1........................
Step 2 — Install Thermostat 2...........................
Step 3 — Set Thermostat Configuration 2.................
Step 4 — Understand Thermostat Operation 2..............
Step 5 — Check Thermostat Operation 3..................
WIRING DIAGRAMS 4................................
SAFETY CONSIDERAT IONS
Read and follow manufacturer instructions carefully. Follow all
local electrical codes during installation. All wiring must conform
to local and national electrical codes. Improper wiring or
installation may damage thermostat.
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the equipment and in the instruction
manual, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING,and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
.
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
INTRODUCTION
There are two Legacy Line--RNC Series programmable thermostat
models, one for AC applications and one for HP applications. Both
are dual powered, operating from either 24VAC or two alkaline
AA batteries. Configuration and program schedules are stored in
non--volatile memory, preserving this information during power
loss and battery removal. Features include simplified 5/2
programming, large backlit display, and modern styling.
The AC model provides one stage of heating and one stage of
cooling.
The HP model provides two stages of heating and one stage of
cooling.
INSTALLATION CONSIDERATIONS
AC Operation
For 24VAC operation, both the R and C wires must be connected
to the 24VAC power source. Batteries are not needed.
Battery Operation
When batteries are used, the common (C) connection is not needed,
saving a wire, and eliminating 24VAC operation. The thermostat
continues to operate in the event of a power failure. Battery life is
one year. A “low battery” reminder tells the homeowner when it is
time to replace the batteries. When connected without the common
wire, the thermostat will not operate without batteries. Continuous
backlighting is not available.
Both Battery and AC Operation
If both batteries and 24VAC operation are used (batteries installed
and the common wire connected), and indefinite clock operation
are provided, the battery will be used only during AC power loss,
extending battery life to nearly its shelf life.
A jumper has to be properly set for backlight operation. J2 should
be set in the “AC” position when the thermostat is operated from
24VAC. J2 should be set in the “BAT” position when the
thermostat is operated from batteries. The thermostat will continue
to operate if J2 is not in the correct position or not connected.
However, the backlight will not operate.
INSTALLATION
Step 1 — Thermostat Location
Thermostat should be mounted:
S Approximately 5 ft (1.5m) from floor.
S Close to or in a frequently used room, preferably on an
inside partitioning wall.
S On a section of wall without pipes or duct work.
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
!
WARNING
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.
1. Turn OFF all power to unit.
2. If an existing thermostat is being replaced:
T1--PAC / T1 -- PHP
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.
!
CAUTION
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.
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 o utput
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
2
buttons are pressed for 5 sec, the display will change back to show
room temperature.
Backlighting
Continuous backlighting is not available. The backlight will come
on for 10 seconds after any button press. Without AC power and
when the battery is low, the backlight will remain off with button
presses.
Battery Indicator
A battery indication icon on the display shows nothing, half, or
low/no battery condition. If the battery is full or operation is from
AC power, no icon appears. Under battery operation, if the battery
is half full, a half full battery icon appears. As the battery depletes
below half, the icon remains at half, but the 10 second backlight
disappears. When the battery is absent or depleted, the display goes
blank except for an empty battery icon and all outputs are turned
off.
Timeguard Timer
A 5 --minute timeguard is built into the thermostat immediately
upon power up, and any time the compressor turns off. The
compressor will not turn on until the timeguard has expired. The
timeguard affects only compressor operation. Pressing UP and
FAN buttons simultaneously will override the timeguard for 1
cycle. If PTAC operation (PH or PC) is selected under Option 1,
the timeguard timer is eliminated.
Cycle Timer
In normal heating and cooling operation the thermostat will not
allow more than 4 equipment cycles per hour (or 1 cycle every 15
minutes). Both the Y and W outputs have a 15--minute timer that
starts counting down when the output is turned on, (e.g., if Y
output is turned on for 9 minutes and then satisfies, it cannot turn
back on for another 6 minutes regardless of demand). However,
pressing UP and FAN buttons simultaneously or changing the
setpoint will override the timer for 1 cycle.
Minimum on Timer
Once the equipment has turned on, it will remain on for a
minimum of 3 minutes regardless of demand. However, the
equipment can turn off in less than 3 minutes if a change in
setpoint, or a change in mode occurs.
Staging Timer
If the thermostat is a heat pump model, it has 2-- stage heat
capability. In normal operation there is a 15--minute delay between
the first and second stages of heat. The Y output will energize first,
then 15 minutes later, W is allowed to come on if the thermostat
determines it is not satisfying the demand.
However, if the heating demand is greater than 5_F, there will be
only a 30 second delay before bringing on W.
Auxiliary Heat Indicator
When operating a heat pump and either auxiliary heat or
emergency heat is active, a front mounted LED indicates this
condition.
Error Messages
If the room temperature sensor fails, two dashes (-- --) will appear in
the temperature display and all heating and cooling outputs will be
turned off. The thermostat must be replaced.
If the internal non--volatile memory fails, E4 will alternately flash
with the temperature on the display and all heating and cooling
outputs will be turned off. The thermostat must be replaced.
Step 5 — Check Thermostat Operation
Fan Operation
1. Press FAN button. This will start continuous fan operation.
FAN ON icon will turn on.
2. Press FAN button again. This will stop continuous fan
operation. FAN ON icon will turn off.
Heating Operation
1. Press H/C button until HEAT is displayed.
2. Press UP button until LCD readout reads 3_F above room
temperature. Press UP and FAN buttons simultaneously to
defeat timers. Heating system should begin to operate
immediately.
3. For HP thermostats only, press H/C button until EMHT
(emergency heat) appears. Press UP and FAN buttons
simultaneously to defeat timers. Emergency heating (W is
ON, Y is OFF) should begin immediately.
Cooling Operation
1. Press H/C button until COOL is displayed.
2. Press DOWN button until LCD readout reads 3_ below
room temperature. Press UP and FAN buttons
simultaneously to defeat timers. Cooling system should
begin to operate immediately.
Table 1 shows the thermostat outputs for each available stage of
heating or cooling. It may be useful in checkout or
troubleshooting.
T1--PAC / T1 -- PHP
EQUIPMENT
CONFIGURATION
OPTION #1
AC, PC AC, HP Y, G W --- --- --- ---
HP, PH
RVS = C
HP, PH
RVS = H
THERMOSTAT
FACTORY
CONFIGURATION
HP Y, G , O /B Y, G Y, G , W W
HP Y, G Y, G , O /B Y, G , W, O /B W
Table 1 – Outputs
COOL
STAGE 1
HEAT
STAGE 1
HEAT
STAGE 2
EM HEAT
3
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