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OPERATION GUIDE

5 Day/2 Day Electronic
Digital Thermostat

1F90-51

WHITE-RODGERS

Operator: Save this booklet for future use!

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Summary of Contents for 1F90-51

Page 1: ...OPERATION GUIDE 5 Day 2 Day Electronic Digital Thermostat 1F90 51 WHITE RODGERS Operator Save this booklet for future use ...

Page 2: ...er to provide precise time temperature control This thermostat offers you the flexibility to design heating and cooling programs that fit your needs Please read this manual thoroughly before operating or programming your thermostat If you have questions write to us at the address shown on the back cover of this manual ...

Page 3: ...UR PROGRAM Set Current Time and Day Enter Heating Program Enter Cooling Program CHECK YOUR PROGRAMMING QUESTIONS AND ANSWERS 29 YOUR NEW THERMOSTAT S FEATURES 4 OPERATING YOUR THERMOSTAT 5 PARTS OF THE THERMOSTAT The Back Of the Thermostat Body The Display The Thermostat Buttons OPERATING FEATURES In This Guide ...

Page 4: ...nuous set point time and room temperature 1 5 volt AA Energizer alkaline battery backup Preprogrammed temperature control YOUR NEW THERMOSTAT S FEATURES Adjustable cycle times Compressor short cycle protection Programmable blower control Blower delay in the cooling cycle Audio and visual prompting during operation Two hour temperature override Manual program override HOLD tempera ture Advance Prog...

Page 5: ...e thermostat body Equipment damage and or personal in jury could occur The subbase is attached to the wall but you can remove the thermostat body for easy program ming To remove the thermostat body from the subbase grasp the thermostat body and gently pull it straight out from the subbase To attach the thermostat body line up the two terminal pins on the lower section of the thermostat back with t...

Page 6: ...n the stored program for approximately a year If power loss is long enough for the program to be lost the thermo stat will automatically return to the factory pro grammed temperatures 64 F heating and 82 F cooling when power is restored You must reprogram the thermostat if this happens If the word BATTERY is flashing in the display window the batteries are low and should be replaced with fresh AA ...

Page 7: ...put your fingernail in the indentation at the topofthedoor thenpullthedooroutfromthetop and swing it down on its hinges On the following pages there are brief descrip tions of the display and the thermostat buttons BACK OF THERMOSTAT BODY 2 pin connector 6 pin connector Batteries W14 S3 ...

Page 8: ...peration when the blower cycles with the heating or cooling system The Display 1 Continuouslydisplayssystemmode HEAT OFF COOL HOLD Duringprogramming theprogramperiodisdisplayed MOR DAY EVE or NHT 2 Alternately displays room temperature F denotes degrees Fahrenheit and C denotes degrees Celsius and time of day A de notes AM time and P denotes PM time 3 Displays the setpoint temperature 4 5 DAY indi...

Page 9: ...SWITCH FAN SWITCH HEAT OFF COOL AUTO TIME FWD TIME BACK SET CLOCK SET DAY VIEW PRGM RUN PRGM HOLD TEMP ADV PRGM 2 DAY 5 DAY FAN AUTO FAN ON ON AUTO 5 DAY FAN AUTO BATTERY WHITE RODGERS DIGITAL COMFORT SET II 4 3 6 6 2 5 ...

Page 10: ...ogram to the DAY program 16 Red arrow Raises temperature set ting 99 F or 37 C maximum The Thermostat Buttons 7 Sets the system mode HEATing OFF or COOLing 8 Selects fan operation see 6 above This button is also used to program the fan to run continuously during a program period 9 Runs display forward or backward through time day or anticipation settings during programming 10 Used with TIME FWD an...

Page 11: ...dicatorlightglowswheneverheat ing cooling or fan are in operation 17 9 10 11 12 13 14 15 8 7 SYSTEM SWITCH FAN SWITCH TIME FWD TIME BACK SET CLOCK SET DAY VIEW PRGM RUN PRGM HOLD TEMP ADV PRGM 16 18 HEAT OFF COOL AUTO ON AUTO 5 DAY FAN AUTO WHITE RODGERS DIGITAL COMFORT SET II ...

Page 12: ...ostat to provide an overnight heating temperature of 62 F and that during the next program period beginning at 6 00 AM you have programmed a temperature of 70 F The thermostat will automatically ac tivate the heating system at about 5 00 AM so that the programmed 70 F temperature is reached by about 6 00 AM The thermostat is configured at the factory so that this feature is disabled If you wish to...

Page 13: ...NCE PROGRAM KEY Press ADV PRGM to change the thermostat to the next program period This will temporarily over ride the program until the next program period begins for example pressing this key while in the DAY program will advance the thermostat to the EVE program which will remain in effect until the NHT program begins F C CONVERTIBILITY Press TIME FWD and TIME BACK at the same time until the te...

Page 14: ...cient If the heat cycles are too short press TIME FWD to increase the cycle time If the CAUTION heat cycles are too long press TIME BACK to de crease the cycle time To set cooling antici pation press SET CLOCK and SET DAY at the same time again The display will show COOL 14 fac tory preprogrammed cooling anticipation Youmayselectanyanticipationsettingfrom 4 to 40 Use TIME FWD and TIME BACK to adju...

Page 15: ...e thermostat indicatessystemoperation seePARTSOF THE THERMOSTAT COMPRESSORSHORTCYCLEPROTEC TION To protect your compressor from potential damage due to rapid cycling this thermostat has a built in delay of 5 minutes between cooling cycles The following may cause a time delay in COOL a Return of power after a power outage b Pressing SYSTEM SWITCH to change operating modes c Pressing creating a call...

Page 16: ...OR YOUR NEEDS First answer the following questions to help you decide what your needs are If you are using the thermostatforacommercialapplication astore officebuilding etc answerquestions1through 4 If you are using the thermostat in your home answer questions 5 through 8 FOR COMMERCIAL APPLICATIONS 1a What time does the first person arrive at the building in the morning b What temperature should ...

Page 17: ...gs IN YOUR HOME 5a What time does the first person get up in the morning b What temperature should the house be at this time These will be your MOR morn ing temperature settings 6a What time does the last person leave the house in the morning b What temperature should the house be at this time These will be your DAY tempera ture settings 7a What time does the first person arrive home in the evenin...

Page 18: ...eprogrammed times and temperatures shown below If this program will suit your needs simply press RUN PRGM to begin running the factory preset program If you want to change the preprogrammed times and temperatures do the following Determine the time periods and heating and cooling temperatures for your weekday pro gram You must program 4 periods for each day MOR DAY EVE and NHT However you may use ...

Page 19: ...19 WEEKDAY 5 DAY WEEKEND 2 DAY Start Time Temperature Start Time Temperature MOR HEAT DAY HEAT EVE HEAT NHT HEAT MOR COOL DAY COOL EVE COOL NHT COOL Heating Cooling Schedule Plan ...

Page 20: ...HEAT NHT HEAT MOR COOL DAY COOL EVE COOL NHT COOL SAMPLE Heating Cooling Schedule Plan 5 30 AM 8 00 AM 5 00 PM 10 30 PM 6 30 AM 2 00 PM 5 00 PM 10 30 PM 7 00 AM 11 00 AM 6 00 PM 11 30 PM 7 00 AM 12 30 PM 6 00 PM 11 30 PM 68 F 70 F 70 F 65 F 76 F 74 F 72 F 78 F 68 F 65 F 70 F 65 F 76 F 78 F 72 F 78 F ...

Page 21: ... programming BE SURE TO USE SYSTEM SWITCH TO TURN THERMOSTAT OFF BEFORE REATTACHING THERMOSTAT TO SUBBASE NOTE Set Current Time and Day 1 Press SET CLOCK once The display will show min utes only EXAMPLE 2 Press and hold either TIME FWD or TIME BACK until you reach the correct minutes 3 Press SET CLOCK once The display window will show the hour only EXAMPLE 4 Press and hold either TIME FWD or TIME ...

Page 22: ...revert to the alter natingtime temperaturedisplay Toresumepro gramming after this happens press VIEW PRGM until youareatthepointwhereyoustoppedprogram ming Then you may continue to enter your programs normally If you want to stop program ming at any time simply press RUN PRGM to resume program operation 1 Press SYSTEM SWITCH until HEAT is displayed 2 Press VIEW PRGM once 5DAY indicatingweekday pro...

Page 23: ... your heating program press RUN PRGM AM and 70 is the programmed tempera ture this example reflects factory prepro gramming 3 To change the displayed start time to your selected start time for weekday MOR heat program press TIME FWD or TIME BACK until your se lected time appears The time will change in 15 minute increments 4 Press or until you reach your selectedweekdayMORheatingtemperature 5 If y...

Page 24: ...ntal compressor operation USE SYSTEM SWITCH TO TURN THER MOSTAT OFF BEFORE REATTACHING THE THERMOSTAT TO THE SUBBASE 1 Press SYSTEM SWITCH until COOL appears 2 Follow the procedure for entering your heat ing program using your selected cooling times and temperatures CHECK YOUR PROGRAMMING Follow these steps to check your thermostat programming one final time before beginning thermostat operation 1...

Page 25: ...YOURTHERMOSTATISNOWCOMPLETELY PROGRAMMEDANDREADYTOAUTOMATI CALLYPROVIDEMAXIMUMCOMFORTAND EFFICIENCY Press SYSTEM SWITCH until OFF is displayed Reattach thermostat to subbase Turn on power to the system Then press SYSTEM SWITCH to select the opera tion mode you want HEAT or COOL Press FAN SWITCH until FAN AUTO is displayed auto matic cycling ...

Page 26: ...ame weekday EVE cooling temperature as you did for weekday DAY which means the temperature will not change when the EVE period begins See PROGRAMMING YOUR THERMOSTAT 3 How can I finish my programming if the display has already changed to time temperature During programming if no buttons are pressed for five minutes the thermostat will enter the HOLD mode and maintain a con stant temperature The di...

Page 27: ...ne batteries are installed the program will be main tained for about one year with no 24 VAC power present to the thermostat See OP ERATING YOUR THERMOSTAT 5 What can cause the thermostat display to freeze or go blank A completely blank display may indicate that power has been lost to the thermostat and the backup battery is also dead How ever if there is power to the thermostat and the display is...

Page 28: ... BATTERY What does this mean The AA batteries installed in the thermo stat are low and should be replaced with fresh AA Energizer alkalinebatteries See OPERATING YOUR THERMOSTAT 7 The display shows a continuous non flashing BATTERY What does this mean The thermostat is not being supplied with 24 VAC power The thermostat is operating on battery power alone See OPERATING YOUR THERMOSTAT 8 Why won t ...

Page 29: ...y reasons The EMR function is operating The EMR functionwillbringonthesystemautomati cally to bring the temperature to the se lected level by the beginning of the next CAUTION programperiod SeeOPERATINGYOUR THERMOSTAT You have programmed the incorrect day or time Check your programming be sure that the times you programmed are correct AM or PM times See PRO GRAMMING YOUR THERMOSTAT The thermostat ...

Page 30: ...PER ATING YOUR THERMOSTAT 12 Between heating and cooling seasons I want to turn my system off Can I do this withoutaffectingmythermostatprogram ming Any time you wish to turn your system off simplypress SYSTEM SWITCH untilthedisplayshows OFF This will not affect your thermostat s programming in any way To turn the sys tem back on press SYSTEM SWITCH until HEAT COOL etc is displayed The system will...

Page 31: ... or if the installed batteries are dead If you are changing the batteries after seeing a flashing BATTERY on the display the installed batteries may be dead If you remove the old batteries and install fresh ones within one minute you should not lose your thermostat programming Af ter installing new batteries follow the proce dures in CHECK YOUR PROGRAMMING to determine whether your programming was...

Page 32: ...99B Replaces 37 5099A 9532 If you need further information on programming or operation write to White Rodgers Division Emerson Electric Co 9797 Reavis Road St Louis MO 63123 5398 Attn Technical Service Department R ...

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