Model RT2
Installation Instructions
SINGLE STAGE HEAT/COOL THERMOSTAT
Please read these instructions completely before attempting installation.
WARNING
Increase
Temperature
Before installing thermostat, turn off all power
to unit. There may be more than one power
disconnect. Electrical shock can cause per-
sonal injury or death.
3.30
Decrease
Temperature
0.8
Improper wiring or installation may damage
thermostat. Wiring must conform to local and
Turns Continuous Fan
On or OFF
Selects System Mode:
OFF. HEAT, or COOL
national electrical codes.
4.55
INSTALLATION CONSIDERATIONS
The thermostat is a wall mounted, low-voltage thermostat,
which maintains room temperature by controlling the opera-
tion of a heating and air conditioning system. Batteries are
not required; temperature and mode settings are preserved
with the power off.
II. INSTALL THERMOSTAT
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
the wall.
C. As each wire is disconnected, record wire color and
terminal marking.
I. THERMOSTAT LOCATION
Thermostat should be mounted:
- Approximately 5 ft. (1.5m) from floor.
D. Discard or recycle old thermostat.
- Close to or in a frequently used room, preferably on an
inside partitioning wall.
- On a section of wall without pipes or duct work.
NOTE: Mercury is a hazardous waste and MUST be
disposed of properly.
Thermostat should NOT be mounted:
- Close to a window, on an outside wall, or next to a door
leading to the outside.
3. Separate the thermostat and back plate.
4. Route thermostat wires through hole in back plate. Level
back plate against wall (for aesthetic value only - thermo-
stat need not be leveled for proper operation) and mark
wall through 2 mounting holes.
- Exposed to direct light and heat from a lamp, sun,
fireplace, or other temperature-radiating object which
may cause a false reading.
- Close to or in direct airflow from supply registers and
return-air grilles.
- In areas with poor air circulation, (behind a door or in
an alcove.)
920-162-01 (5-05)
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V. THERMOSTAT CONFIGURATION
Thisthermostathasbeencarefullyconfiguredatthefactorytoprovide
optimum operation for most installations. The settings programmed
into it at the factory should NOT be changed unless determined to
be absolutely necessary by a qualified HVAC contractor.
4. Use up and down buttons to change between F and C.
5. Press MODE button to return to
d
. Up and down buttons
now move between option choices; or press FAN button
to exit configuration mode.
VI. CHANGING THERMOSTAT CONFIGURATION
o
F. ROOM TEMPERATURE OFFSET ADJUST Selection
The selected number is the number of degrees, plus or
minus, which will be added to the actual temperature. The
numbers can range between -5 and +5. Factory default is
0. This adjusted value will be used as actual temperature for
both display and control action. The effect is that a positive
number selection will make the room temperature lower, and
vice versa. The thermostat is calibrated within an accuracy
of plus or minus 2 degrees when shipped from the factory; this
adjustment will provide the best accuracy when set to 0.
If it has been determined that re-configuration of the thermostat
is required, the following instructions will assist the professional
HVAC installer in accomplishing this task:
While in configuration mode, three option choices can be made:
A
Anticipator Value Adjustment
d
Display temperature Fahrenheit/Celsius Selection
oF Offset Adjustment for Room Temperature
C
r
Cycle rate. Maximum number of cycles per hour
TO ENTER THE CONFIGURATION MODE:
TO SELECT:
1. Enter configuration mode (if not already there).
2. Use UP and DOWN buttons to display
Press and hold the FAN button for approximately 10 sec until
room temperature disappears and the display reads “A". You
are now in the configuration mode.
oF.
3. Press MODE button once to display offset value.
NOTE: If the FAN button is pressed again or if no button is
pressed for 2 minutes, the thermostat will exit the configura-
tion mode and return to normal operation. To re-enter the
configuration mode, the FAN button must be pressed and
held for 10 sec. again.
4. Use UP and DOWN buttons to select a value between
-5 and 5.
5. Press MODE button to return to oF. UP and DOWN
buttons now move between option choices; or press
FAN button to exit configuration Mode.
WHILE IN CONFIGURATION MODE, THE FOLLOWING
OPTIONS ARE AVAILABLE:
C
r
. CYCLE RATE Selection
This selection selects the cycle rate maximum in cycles per
hour.
A. ANTICIPATOR - Value Adjustment
This adjustment controls the sensitivity and cycle rate of the
thermostat. Higher numbers decrease the sensitivity and slow
the cycle rate. Lower numbers increase the sensitivity and
increase cycle rate. However, a limiting feature will not allow
more than 4 equipment cycles per hour, regardless of setting.
Values can range from 1 to 3. Factory default setting is 2. This
default selection will provide optimum performance in nearly
all installations. Try it first. Do not change setting unless there
is evidence of need to do so. Unlike conventional anticipators,
this setting is not determined by current draw. There is no need
to measure, know, or compensate for current.
TO SELECT:
1. Enter configuration mode (if not already there).
2. Use up and down buttons to display C
r
3. Press MODE button once to display current selection 3
to 6.
4. Use up and down buttons to change.
5. Press MODE button to return to C . Up and down but-
r
tons now move between option choices or press FAN
button to exit configuration mode.
TO ADJUST:
o
P. OPERATING MODE – H/C or HP operation
The selected mode (H/C or HP) will operate the thermostat
as a Heat Cool or as a Heat Pump thermostat.
1. Enter configuration mode (if not already there).
2. Use up and down buttons to display A
3. Press MODE button once to display current value.
4. Use up and down buttons to move between values.
5. Press MODE button to return to A. Up and down but-
TO SELECT:
1. Enter configuration mode (if not already there).
2. Use UP and DOWN buttons to display
tons now move between option choices A,
press FAN button to exit configuration mode.
d-, etc. or
oP.
3. Press MODE button once to display operating mode.
4. Press UP and DOWN buttons to change between HC
and HP.
d
. FAHRENHEIT/CELSIUS Selection
This selection operates the thermostat in either Fahrenheit or
Celsius.
5. Press MODE button to return to oP. UP and DOWN but-
tons now move between option choices; or press FAN
button to exit configuration Mode.
TO SELECT:
1. Enter configuration mode (if not already there).
NOTE: After changing any thermostat configuration
settings, ALWAYS re-check the thermostat in ALL
modes to verify proper operation.
2. Use up and down buttons to display
d
3. Press MODE button once to display current selection of
F or C.
3
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FRIEDRICH AIR CONDITIONING CO. INC.
Post Office Box 1540 · San Antonio, Texas 78295-1540
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212
(210) 357-4400 · FAX (210) 357-4480
Printed in the U.S.A.
920-162-01 (5-05)
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