Friedrich RT2 User's Manual
Contents
1. eadout will display oP WIRING DIAGRAMS NOTE All excess wire should be pushed back into the wall as far as possible Excess wire inside the thermostat plastic case may interfere with the air flow across the temperature sensor SINGLE STAGE HEAT COOL WIRING Thermostat Unit Terminal Strip 24 VAC HOT R 24 VAC COMM C Reversing Valve B 4 Connection to B terminal required on Heat Pump models lll CHECK THERMOSTAT OPERATION 1 Fan Operation A Press fan button starting fan operation Fan icon turns on B Press Fan button stopping fan operation Fan icon turns off 2 Heating Operation A Press and Release MODE button until HEAT is dis played B Press up button until LCD readout reads 10 degrees above room temperature Heating system should begin to operate within 5 minutes 3 Cooling Operation A Press and Release MODE button until COOL is dis played B Press down button until LCD readout reads 10 degrees below room temperature Cooling system should begin to operate within 5 minutes IV THERMOSTAT OPERATION 1 TEMPERATURE DISPLAY The thermostat will display room temperature until the UP or DOWN button is pressed The word SET appears when these buttons are pressed and the current set point is displayed If no buttons are pressed for 5 seconds the display will change back to show room temperature 2 TIMEGUARD TIMER A5 minute timeguard is built into the thermostat immedia2. ly necessary by a qualified HVAC contractor VI CHANGING THERMOSTAT CONFIGURATION 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 Er Cycle rate Maximum number of cycles per hour TO ENTER THE CONFIGURATION MODE 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 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 WHILE IN CONFIGURATION MODE THE FOLLOWING OPTIONS ARE AVAILABLE 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 optim
3. rriedrich installation Instructions SINGLE STAGE HEAT COOL THERMOSTAT Please read these instructions completely before attempting installation WARNING 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 Improper wiring or installation may damage thermostat Wiring must conform to local and national electrical codes 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 THERMOSTAT LOCATION Thermostat should be mounted Approximately 5 ft 1 5m from floor Close to or in a frequently used room preferably on an inside partitioning wall On a section of wall without pipes or duct work Thermostat should NOT be mounted Close to a window on an outside wall or next to a door leading to the outside 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 Model RT2 Zh Ott rm aN Co fa 3 30 Decrease Temperat
4. tely upon power up and any time the compressor turns off The compres sor will not turn on until the timeguard has expired Pressing UP and FAN buttons simultaneously will override the timeguard for 1 cycle 3 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 set point will override the timer for 1 cycle 4 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 set point or a change in mode occurs 5 ERROR MESSAGES E4 will be displayed ifthe thermostat has an internal memory failure If E4 appears replace the thermostat two dashes will be displayed if the temperature cannot properly read the room temperature If appears replace the thermostat V THERMOSTAT CONFIGURATION This thermostat has been carefully configured at the factory to provide optimum operation for mostinstallations The settings programmed into it at the factory should NOT be changed unless determined to be absolute
5. tween option choices or press FAN button to exit configuration Mode NOTE After changing any thermostat configuration settings ALWAYS re check the thermostat in ALL modes to verify proper operation rriedrich 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 www friedrich com Printed in the U S A 920 162 01 5 05
6. um 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 ADJUST 1 Enter configuration mode if not already there Use up and down buttons to display A Press MODE button once to display current value Use up and down buttons to move between values Press MODE button to return to A Up and down but tons now move between option choices f d etc or press FAN button to exit configuration mode oa AON d FAHRENHEIT CELSIUS Selection This selection operates the thermostat in either Fahrenheit or Celsius TO SELECT 1 Enter configuration mode if not already there 2 Use up and down buttons to display d 3 Press MODE button once to display current selection of Forl 4 Use up and down buttons to change between F and 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 oF 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
7. ure Selects System Mode Turns Continuous Fan OFF HEAT or COOL On or OFF lt 4 55 ll 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 D Discard or recycle old thermostat NOTE Mercury is a hazardous waste and MUST be disposed of properly 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 5 Drill two 3 16 in mounting holes in wall where marked Note Mounting holes on back plate are designed to fit on a horizontal J box 6 Secure back plate to wall with 2 anchors and screws provid ed making sure all wires extend through hole in back plate 7 Connect wires to proper terminal of the connector block 8 Push any excess wire back into wall Excess wire inside the thermostat plastic case can interfere with proper air flow across the temperature sensor Seal hole in wall to prevent air leaks Leaks can affect operation 9 Install thermostat on back plate 10 Turn on power to the unit On initial power up the LCD r
8. 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 TO SELECT 1 Enter configuration mode if not already there 2 Use UP and DOWN buttons to display oF 3 Press MODE button once to display offset value 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 Cr CYCLE RATE Selection This selection selects the cycle rate maximum in cycles per hour TO SELECT 1 Enter configuration mode if not already there 2 Use up and down buttons to display Cr 3 Press MODE button once to display current selection 3 to 5 4 Use up and down buttons to change 5 Press MODE button to return to Er Up and down but tons now move between option choices or press FAN button to exit configuration mode oP 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 TO SELECT 1 Enter configuration mode if not already there 2 Use UP and DOWN buttons to display oP 3 Press MODE button once to display operating mode 4 Press UP and DOWN buttons to change between HE and HP 5 Press MODE button to return to oP UP and DOWN but tons now move be
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