Friedrich Thermostat RT2 User Manual

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)  
 
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
 
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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