White Rodgers 750 Thermostat User Manual
Contents
1. Factory Program WEEKDAY 5 DAY WEEKEND 2 DAY Period ano no ano Tao Entering Your Program Follow these steps to enter the heating and cooling programs you have selected Set Current Time and Day 1 Press TIME button once The display will show the hour only 2 Press and hold either AA or amp until you reach the correct hour and AM PM designation AM begins at midnight PM begins at noon 3 Press TIME once The display window will show the minutes only EXAMPLE wi 4 Press and hold either zy or lt 7 until you reach the correct minutes 5 Press TIME once The display will show the day of the week Press 7 or Gz until you reach the current day of the week Press RUN once The display will show the correct time and room temperature alternately No Enter Heating Program 1 Move the SYSTEM switch to HEAT 2 Press PRGM once A indicating weekday program will ap pear inthe display Also displayed are the currently programmed start time for the 1st heating period and the currently pro grammed temperature flashing EXAMPLE This display window shows that for the 1st weekday period the start time is 6 00 AM and 70 is the programmed tempera ture this example reflects factory preprogramming 3 Press A or wz to change the displayed temperature to your selected temperature for the 1st heating program period 4 Press TIME once the programmed time will flash Press ced O2. HOLD FAN SYSTEM MO O TU NE Ta FR Spa 000 am Pt ma eM DULY HOLD BATTERY Figure 8 Thermostat display buttons and switches temperature by pressing or Ws The thermostat will hold the room temperature at the selected setting until you press the RUN button to start program operation again ENERGY MANAGEMENT RECOVERY Energy Manage ment Recovery EMR causes the thermostat to start heating or cooling early to make the building temperature reach the program setpoint at the time you specify Heating will start 5 minutes early for every 1 of temperature required to reach setpoint Cooling will start approximately 15 minutes early for every 1 because it takes longer to reach temperature Clipping W903 jumper will disable EMR Example You select EMR and have your heating pro grammed to 65 at night and 70 at 7 AM If the building temperature is 65 the difference between 65 and 70 is 5 Allowing 5 minutes per degree the thermostat setpoint will change to 70 at 6 35 AM e F C CONVERTIBILITY The factory default setting is Fahrenheit Clipping W904 jumper on the circuit board see fig 1 will alter this feature to Celsius temperature setting LOW BATTERY INDICATOR If the 2 AAA alkaline batter ies are low and should be replaced the display will be blank except for LO BATTERY When the batteries are low pressing any button will cause the display t
3. SCREWDRIVER HAND OR POWER DRILL BIT IF NEEDED ge ae I WIRE CUTTER STRIPPER Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and or property damage REMOVING OLD THERMOSTAT A CAUTION To prevent electrical shock and or equipment damage disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete Before removing wires from old thermostat s switching subbase label each wire with the terminal designation it was removed from 1 Remove Old Thermostat A standard heat cool thermostat consists of three basic parts a The cover which may be either a snap on or hinge type b The base which is removed by loosening all captive screws c The switching subbase which is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate 2 Shut off electricity at the main fuse box until installation is complete Ensure that electrical power is disconnected 3 Remove the front cover of the old thermostat With wires still attached remove wall plate from the wall If the old thermostat has a wall mounting plate remove the thermostat and the wall mounting plate as an assembly 4 Identify each wire attached to the old thermostat 5 Disconnectthe wires from the old thermostat one at atime DO NOT LET WIRES FALL BACK INTO THE WALL 6 Install new thermostat using the follow
4. system operates correctly replace the thermostat Furnace Cycles Too Fast or Too Slow narrow or wide temperature swing The location of the thermostat and or the size of the Heating System may be influencing the cycle rate Digital thermostats normally provide precise temperature control and may cycle faster than some older mechanical models A faster cycle rate means the unit turns on and off more frequently but runs for a shorter time so there is no increase in energy use If you would like to increase the cycle time clip Jumper W 905 as mentioned in the instructions for Hydronic Heating Systems It is not possible to shorten the cycle time If an acceptable cycle rate is not achieved as received or by clipping W 905 contact a local service person for additional suggestions Cooling Cycles Too Fast or Too Slow narrow or wide temperature swing The location of the thermostat and the size of the Cooling System can influence the cycle rate The cycle rate for cooling is fixed and can not be adjusted Contact a local service person for suggestions Thermostat Setting and Thermostat Thermometer Disagree Thermostat thermometer setting requires adjustment The thermometer can be adjusted 3 degrees See Temperature Display Adjustment in the Operation section Thermostat Does Not Follow Program AM or PM set incorrectly in program AM or PM set incorrectly on the clock Voltage spike or s
5. Check Your Programming Follow these steps to check your thermostat programming one final time before beginning thermostat operation 1 Move SYSTEM switch to HEAT position 2 Press PRGM to view the 1st weekday heating period time and temperature Each time you press PRGM the next heating period time and temperature will be displayed in sequence for weekday then weekend program periods you may change any time or temperature during this procedure Press RUN Move SYSTEM switch to COOL position Repeat step 2 to check cooling temperatures Press RUN to begin program operation Oar wo YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND READY TO AUTOMATICALLY PROVIDE MAXIMUM COMFORT AND EFFICIENCY 7 SPECIFICATIONS ELECTRICAL DATA Electrical Rating MV to 30 VAC 50 60 Hz or D C 0 05 to 1 0 Amps Load per terminal 1 5 Amps Maximum Total Load All terminals combined THERMAL DATA Setpoint Temperature Range 45 F to 90 F 7 C to 32 C Operating Ambient Temperature Range 32 F to 105 F Operating Humidity Range 0 to 90 RH non condensing Shipping Temperature Range 40 F to 150 F 8 TROUBLESHOOTING Reset Operation If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat by pressing AA Gz and TIME at the same time This also resets the factory defaults If the thermostat has power has been reset and still does not function corr
6. If your system is an electric or heat pump system that REQUIRES the thermostat to turn on the fan on a call for heat locate the GAS ELECTRIC switch see fig 1 and switch it to the ELECTRIC position This will allow the thermostat to energize the fan immediately on a call for heat If you are unsure if the heating cooling system requires the thermostat to control the fan contact a qualified heating and air conditioning service person Hydronic Hot Water or Steam Heating Systems This thermostat is set to operate properly with a forced air heating system If you have a hydronic heating system a system that heats with hot water or steam you must set the thermostat to operate properly with your system The factory default setting is forced air heat Clipping jumper W905 on the circuit board will produce a longer heating cycle which is normally for hot water or steam hydronic systems Both settings produce a very accurate temperature control and can be set to your personal preference As received the thermostat cycles the system just under 1 F With W905 clipped the system cycles at approximately 1 5 F A CAUTION Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat Personal injury and or property damage may occur TERMINAL CROSS REFERENCE CHART New Thermostat Other Manufacturers Terminal Designation Terminal Designation RH RH M R G w Y Y These are
7. WHITE RODGERS Installation Instructions for Heating amp Cooling E rr Digital Model 750 5 2 Day Programmable aoa Thermostat YOUR THERMOSTAT REPLACES Description Standard Heat amp Cooling Systems 4 or 5 wires Standard Heat Only Systems Millivolt Heat Only Systems Floor or Wall Furnaces Standard Central Air Conditioning Gas or Oil Heat Electric Furnace Hydronic Hot Water Zone Heat 2 Wires Hydronic Hot Water Zone Heat 3 Wires Heat Pump No Aux or Emergency Heat Heat Pump with Aux or Emergency Heat Baseboard Electric Heating or Line Voltage 120 or 240 volt 2 THERMOSTAT DETAILS Mounting hole W903 Clip to Disable EMR Feature Mounting hole W905 Clip for Hydronic System W904 Electric Gas Clip for Switch Celsius Display Figure 1 Thermostat base WHITE RODGERS EMERSON ELECTRIC CO 9797 REAVIS ROAD ST LOUIS MISSOURI 63123 5398 www white rodgers com CONTENTS Preparations eeeeeeee Thermostat Details Removing Old Thermostat ccceeee 1 Mounting and Wiring seeen 2 Check Thermostat Operation eeeee 3 Programming your Thermostat 005 4 Specifications ccccceececcceesseeeseseeeeseneeeesees 6 Troubleshooting 0 00 ee eeeeeeeeeeeeeneeeeeneeteetneeeeeee 6 PREPARATIONS Assemble tools required as shown below J FLAT BLADE
8. below room tempera ture The blower should come on immediately on high speed followed by cold air circulation 3 Press AA to adjust temperature setting above room tem perature The cooling system should stop operating Heating System 1 Move SYSTEM switch to HEAT position If the heating system has a standing pilot be sure to light it 2 Press A to adjust thermostat setting above room tempera ture The heating system should begin to operate 3 Press to adjust temperature setting below room tem perature The heating system should stop operating www white rodgers com CHECK THERMOSTAT OPERATION CONTINUED FROM THIRD PAGE Before you begin programming your thermostat you should be familiar with its features and with the display and the location and operation of the thermostat buttons Your thermostat consists of two parts the thermostat cover and the base To remove the cover gently pull it straight out from the base To replace the cover line up the cover with the base and press gently until the cover snaps onto the base The Thermostat Buttons and Switches Up arrow Raises temperature setting Down arrow Lowers temperature setting 8 TIME button PRGM program button RUN program button HOLD button T FAN switch ON AUTO SYSTEM switch COOL OFF HEAT The Display Indicates day of the week Q is displayed when the SYSTEM switch is in the HEAT position i is disp
9. d This sound usually indicates the thermo stat is operating properly If the thermostat does not click try the reset operation listed above If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement If the thermostat Clicks contact the furnace manufacturer or a service person to verify the heating is operating correctly No Cool SYSTEM Switch not set to COOL Loose connection to thermostat or system Cooling system requires service or thermostat requires replacement Set SYSTEM Switch to COOL and lower setpoint temperature below room temperature Verify thermostat and system wires are securely attached Same procedure as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature There may be up to a five minute delay before the thermostat clicks in Cooling Heat Cool or Fan Runs Constantly ROD Possible short in wiring Possible short in thermostat Possible short in heat cool fan system FAN Switch set to Fan ON Check each wire connection to verify they are not shorted or touching together No bare wire should stick out from under terminal screws Try resetting the thermostat as described above If the condition persists the manufacturer of your system or service person can instruct you on how to test the Heat Cool system for correct operation If the
10. ectly contact your heating cooling service person or place of purchase Batteries For optimum performance we recommend replacing batteries once a year with fresh AAA Energizer alkaline batteries Symptom Possible Cause Corrective Action No Heat No Cool No Fan 1 Blown fuse or tripped circuit breaker Replace fuse or reset breaker common problems 2 Furnace power switch to OFF Turn switch to ON 3 Furnace blower compartment door or Replace door panel in proper position to engage panel loose or not properly installed safety interlock or door switch No Heat 1 Pilot light not lit Re light pilot be intermittent 2 SYSTEM Switch not set to HEAT 3 Loose connection to thermostat or system Set SYSTEM Switch to HEAT and raise setpoint temperature above room temperature Verify thermostat and system wires are securely attached 4 Furnace Lock Out Condition Heat may also Many furnaces have safety devices that shut down when a lock out condition occurs If the heat works intermittently contact the furnace manufacturer or local service person for assistance www white rodgers com 8 TROUBLESHOOTING Symptom Possible Cause Corrective Action No Heat continued 5 Heating system requires service or raise thermostat requires replacement Diagnostic Set SYSTEM Switch to HEAT and the setpoint above room temperature Within a few seconds the thermostat should make a soft click soun
11. ermostat operation Battery Location This thermostat requires 2 AAA alkaline batteries to operate If LO BATTERY is displayed the batteries are low and should be replaced with fresh AAA Energizer alkaline batteries To replace the batteries install the batteries along the top of the base see fig 1 The batteries must be installed with the positive ends to the right www white rodgers com MOUNTING AND WIRING CONTINUED FROM SECOND PAGE JUMPER WIRE NOTE For 2 wire Heat only attach to RH and W TRANSFORMER Figure 2 Typical wiring diagram for heat only 3 wire single transformer systems JUMPER WIRE TRANSFORMER Figure 3 Typical wiring diagram for cool only 3 wire single transformer systems NOTE RED jumper wire provided with thermostat must be connected between thermostat RH and RC terminals JUMPER for proper thermostat operation with this system WIRE Neutral TRANSFORMER Figure 4 Typical wiring diagram for heat cool 4 wire single transformer systems HEATING TRANSFORMER COOLING TRANSFORMER Figure 5 Typical wiring diagram for heat cool 5 wire two transformer systems JUMPER JUMPER WIRE WIRE Reversing Compressor Fan Valve Contactor Rela Reversing valve is energized when the system switch is in the COOL position TRANSFORMER Figure 6 Typical wiring diagram for heat pump with reversing valve energized
12. four wire single transformer systems Factory installed jumper wire between the RH and RC terminals must remain in place Energy Management Recovery EMR This thermostat is set to operate with EMR This causes the thermostat to start the heating or cooling system early to have the room temperature reach the program setpoint at the time the period is to start To disable EMR clip jumper W903 see Fig 1 Attach Thermostat Base to Wall 1 Remove the packing material from the thermostat Gently pull the cover straight off the base Forcing or prying on the thermostat will cause damage to the unit If necessary move the electric heat switch see ELECTRIC HEAT SYSTEMS above 2 Connect wires beneath terminal screws on base using appro priate wiring schematic see figs 2 through 7 3 Place base over hole in wall and mark mounting hole locations on wall using base as a template 4 Move base out of the way Drill mounting holes 5 Fasten base loosely to wall as shown in fig 1 using two mounting screws Adjust until level and then tighten screws Leveling is for appearance only and will not affect thermostat operation If you are using existing mounting holes or if holes drilled are too large and do not allow you to tighten base snugly use plastic screw anchors to secure subbase 6 Push excess wire into wall and plug hole with a fire resistant material such as fiberglass insulation to prevent drafts from affecting th
13. in COOL JUMPER JUMPER WIRE WIRE Reversing valve is energized when the Neutral system switch is in the HEAT position TRANSFORMER Figure 7 Typical wiring diagram for heat pump with reversing valve energized in HEAT 5 CHECK THERMOSTAT OPERATION NOTE To prevent static discharge problems touch side of ther mostat to release static build up before touching any keys If at any time during testing your system does not operate properly contact a qualified serviceperson Fan Operation If your system does not have a G terminal connection skip to Heating System 1 Turn on power to the system 2 Move FAN switch to ON position The blower should begin to operate 3 Move FAN switch to AUTO position The blower should stop immediately A CAUTION To prevent compressor and or property damage if the outdoor temperature is below 50 F DO NOT operate the cooling system This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize If the tempera ture is adjusted to call for cool within 5 minutes of the last cycle the snowflake icon will blink indicating the thermostat is locked out After 3 to 5 minutes the compressor will start and the snowflake icon will stop flashing This helps prevent the compressor from cycling too quickly and is normal operation for the thermostat 1 Move SYSTEM switch to COOL position 2 Press lt 7 to adjust thermostat setting
14. ing procedures PART NO 37 6319D Replaces 37 6319C 0435 REMOVING OLD THERMOSTAT CONTINUED FROM FIRST PAGE ATTENTION This product does not contain mercury How ever this product may replace a unit which contains mercury Do not open mercury cells If a cell becomes damaged do not touch any spilled mercury Wearing non absorbent gloves take up the spilled mercury and place into a container which can be sealed If a cell becomes damaged the unit should be discarded Mercury must not be discarded in household trash When the unit this product is replacing is to be discarded place in a suitable container and return to White Rodgers at 2895 Harrison Street Batesville AR 72501 2117 for proper disposal MOUNTING AND WIRING A WARNING Do not use on circuits exceeding specified voltage Higher voltage will damage control and could cause shock or fire hazard Do not short out terminals on gas valve or primary control to test Short or incorrect wiring will damage thermostat and could cause personal injury and or KOI A ELLET N Thermostat installation and all components of the sys tem shall conform to Class II circuits per the NEC code Electric Heat or Single Stage Heat Pump Systems This thermostat is configured from the factory to operate a heat cool fossil fuel gas oil etc forced air system It is configured correctly for any system that DOES NOT require the thermostat to energize the fan on a call for heat
15. layed non flashing when the SYSTEM switch is in the COOL position is displayed flashing when the compressor is in lockout mode Alternately displays current time and temperature LO BATTERY is displayed when the 2 AAA batteries are low and should be replaced Nothing else will be displayed E Displays currently programmed set temperature this is blank when SYSTEM switch is in the OFF position HOLD is displayed when the thermostat is in the HOLD mode Operating Features Now that you are familiar with the thermostat buttons and display read the following information to learn about the many features of the thermostat SIMULTANEOUS HEATING COOLING PROGRAM STOR AGE When programming you can enter both your heating and cooling programs at the same time There is no need to reprogram the thermostat at the beginning of each season TEMPERATURE OVERRIDE Press A or amp until the display shows the temperature you want The thermostat will override current programming and keep the room tempera ture atthe selected temperature until the next program period begins Then the thermostat will automatically revert to the program HOLD TEMPERATURE The thermostat can hold any temperature within its range for an indefinite period without reverting to the programmed temperature Press HOLD button HOLD will be displayed Then choose the desired WHITE RODGERS TIME PRGM RUN
16. o operate for ten seconds After ten seconds the display will return to blank except for LO BATTERY After LO BATTERY has been displayed for 4 weeks the thermostat will raise the temperature 10 degrees above your setpoint on COOL mode and will drop temperature 10 degrees below your setpoint on HEAT mode You cannot program with low batteries but you can override setpoint temperature www white rodgers com TEMPERATURE DISPLAY ADJUSTMENT Your new thermostat has been accurately set in our factory However if you wish you may adjust your new thermostat temperature display to match your old thermostat This can be accom plished within a 3 range as follows 1 Press PRGM and RUN buttons at the same time 2 Press A or amp to adjust the displayed temperature to your desired setting 3 Press RUN to resume normal program operation Display Backlight Not available on earlier models The display backlight improves display contrast in low lighting conditions Selecting backlight ON will turn the light on for a short period of time after any button is pressed Selecting backlight OFF default will keep the light off Turn the display backlight feature ON as follows 1 Press TIME and RUN buttons at the same time The display will show d L and OFF alternately 2 Press A or G7 to change OFF to ON O PROGRAMMING YOUR THERMOSTAT This section will help you plan your thermostat s program
17. r GW until your selected time appears The time will change in 15 minute increments When your selected time is displayed press TIME again to return to the change tempera ture mode 5 Press PRGM once The currently programmed start time and setpoint temperature for the 2nd heating program period will appear Heating Cooling Schedule Plan WEEKDAY 5 DAY WEEKEND 2 DAY Period Start Start Time Temperature Time Temperature www white rodgers com PROGRAMMING YOUR THERMOSTAT CONTINUED FROM FIFTH PAGE 6 Repeat steps 4 and 5 to select the start time and heating temperature for the 2nd heating program period 7 Repeat steps 4 through 6 for the 3rd and 4th heating program periods Weekday heating programs are now complete 8 Press PRGM once SA SU indicating weekend program will appear in the display along with the start time for the 1st heating period and the currently programmed temperature 9 Repeat steps 4 through 8 to complete weekend heating programming 10 When you have completed entering your heating program press RUN Enter Cooling Program If the outside temperature is below 50 F disconnect power to the cooling system before programming Ener gizing the air conditioner compressor during cold weather may cause personal injury or property damage 1 Move SYSTEM switch to COOL position 2 Follow the procedure for entering your heating program using your selected cooling times and temperatures
18. tatic discharge Check current clock and program settings including the AM or PM designations for each time period If a voltage spike or a static discharge occurs use the Reset Operation listed above Blank Display and or Keypad Not Responding Voltage spike or static discharge 2 Battery change required Replace batteries and check heat cool system for proper operation If a voltage spike occurs use the Reset Operation listed above www white rodgers com
19. to meet your needs For maximum comfort and efficiency keep the following guidelines in mind when planning your program e When heating cooling your building program the tempera tures to be cooler warmer when the building is vacant or during periods of low activity During early morning hours the need for cooling is usually minimal Look at the factory preprogrammed times and temperatures shown below If this program will suit your needs simply press the RUN button to begin running the factory preset program If you want to change the preprogrammed times and tempera tures follow these steps Determine the time periods and temperatures for your weekday and weekend programs You must program four periods for both the weekday and weekend program However you may use the same heating and cooling temperatures for consecutive time periods You can choose start times heating temperatures and cooling temperatures independently for both weekday and week end programs for example you may select 5 00 AM and 70 as the weekday 1st period heating start time and temperature and also choose 7 00 AM and 76 as the weekday 1st period cooling start time and temperature Use the table at the bottom of the page to plan your program time periods and the temperatures you want during each period You may also want to look at the sample program table to get an idea of how the thermostat can be programmed SAMPLE Heating Cooling Schedule Plan
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