White Rodgers 1E78-144 Installation and Operation Instructions
Contents
1. Move FAN switch to AUTO position The blower should stop im mediately Cooling System This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize If the temperature is adjusted to call for cool within 5 minutes of the last cycle the snow flake 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 to adjust thermostat setting below room temperature The blower should come on immediately on high speed followed by cold air circulation 3 Press to adjust temperature setting above room temperature 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 to adjust thermostat setting above room temperature The heating system should begin to operate 3 Press to adjust temperature setting below room temperature The heating system should stop operating CAUTION To prevent compressor and or property damage if the outdoor temperature is below 50 F DO NOT operate the cooling system www white rodgers com Before you begin using your thermostat you should be familiar with its features and with the display and the locatio2. The thermostat will keep the room temperature at the selected temperature F C CONVERTIBILITY The factory default setting is Fahr enheit 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 batteries are low and should be replaced the display will be blank except for When the batteries are low pressing any but ton will cause the display to operate for ten seconds After ten seconds the display will be blank except for After has been displayed for 4 weeks the thermostat will raise the temperature 10 above your setpoint in COOL mode and drop the temperature 10 below your setpoint in HEAT mode You cannot program with low batteries but you can override setpoint temperature TEMPERATURE DISPLAY ADJUSTMENT Your new ther mostat 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 accomplished within a 3 range as follows 1 Press and at the same time for two seconds with the SYSTEM switch in OFF position 2 Press or to adjust the displayed temperature to your desired setting 3 Move SYSTEM switch from OFF to exit the feature DISPLAY BACKLIGHT The display backlight improves dis play contrast in low lighting conditions Selecting backlight ON will turn the light on for a
3. 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 accept able 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 1 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 sug gestions Thermostat Setting and Thermostat Thermometer Disagree Thermostat thermometer setting requires adjust 1 ment The thermometer can be adjusted 3 degrees See Temperature Display Adjustment in the Operation section Blank Display and or Keypad Not Responding Voltage spike or static discharge 1 Battery change required 2 Replace batteries and check heat cool system for proper operation If a voltage spike occurs use the Reset Operation listed above 7 TROUBLESHOOTING CONTINUED FROM FIFTH PAGE www white rodgers com NOTES White Rodgers is a division of Emerson Elect
4. 1 Remove the packing material from the thermostat Gently pull the body 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 appropri ate 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 mount ing 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 thermostat operation Battery Location This thermostat requires 2 AAA alkaline batteries to operate If appears on the display the batteries are low and should be replaced with fresh AAA Energizer alkaline batteries The batteries are located on the back of the thermostat body see fig 1 CAUTION Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat Personal injury and or pro
5. CONTENTS Preparations 1 Thermostat Details 1 Removing Old Thermostat 1 Mounting and Wiring 2 Check Thermostat Operation 3 Specifications 5 Troubleshooting 5 1 PREPARATIONS 2 THERMOSTAT DETAILS 3 REMOVING OLD THERMOSTAT 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 com plete 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 using the labels enclosed with the new thermostat 5 Disconnect the wires from the old thermostat
6. aline batteries 6 SPECIFICATIONS 7 TROUBLESHOOTING Symptom Possible Cause Corrective Action No Heat No Cool No Fan common problems Blown fuse or tripped circuit breaker 1 Furnace power switch to OFF 2 Furnace blower compartment door or panel 3 loose or not properly installed Replace fuse or reset breaker Turn switch to ON Replace door panel in proper position to engage safety interlock or door switch No Heat Pilot light not lit 1 SYSTEM Switch not set to 2 HEAT Loose connection to thermostat or system 3 Furnace Lock Out Condition Heat may also be 4 intermittent 5 Heating system requires service or thermostat requires replacement Re light pilot Set SYSTEM Switch to HEAT and raise setpoint temperature above room temperature Verify thermostat and system wires are securely attached 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 Diagnostic Set SYSTEM Switch to HEAT and raise the setpoint above room temperature Within a few seconds the thermostat should make a soft click sound This sound usually indicates the ther mostat 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 replac
7. at Yes Hot Water Zone Heat Only Two Wire Systems Yes Hot Water Zone Heat Only Three Wire Systems No Line Voltage Heating or Baseboard 110 240 Volt Systems No Millivolt Systems Floor or Wall Furnaces Yes 12 VDC Mobile Home Application Yes Multistage Systems No Systems Exceeding 30VAC 1 5 Amp No CAUTION www white rodgers com www emersonclimate com www white rodgers com 4 MOUNTING AND WIRING ATTENTION This product does not contain mercury However 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 con tainer Refer to www white rodgers com for location to send product containing mercury 3 REMOVING OLD THERMOSTAT CONTINUED FROM FIRST PAGE 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 property damage Thermostat installation and all components of the system shall conform to Class II circ
8. ed with thermostat must be connected between thermostat RH and RC terminals for proper thermostat operation with this system NOTE RH Y 24 VAC 120 VAC Hot Neutral THERMOSTAT SYSTEM G W Figure 5 Typical wiring diagram for heat cool 5 wire two transformer systems HEATING TRANSFORMER Heating System Fan Relay Cooling System RC 24 VAC 120 VAC Hot Neutral COOLING TRANSFORMER O B RH Y 24 VAC 120 VAC Hot Neutral THERMOSTAT SYSTEM G W Figure 6 Typical wiring diagram for heat pump with reversing valve energized in COOL TRANSFORMER Reversing Valve RC O B JUMPER WIRE Compressor Contactor JUMPER WIRE Reversing valve is energized when the system switch is in the COOL position Fan Relay RH Y 24 VAC 120 VAC Hot Neutral THERMOSTAT SYSTEM G W Figure 7 Typical wiring diagram for heat pump with reversing valve energized in HEAT TRANSFORMER Reversing Valve RC O B JUMPER WIRE Compressor Contactor JUMPER WIRE Reversing valve is energized when the system switch is in the HEAT position Fan Relay If at any time during testing your system does not operate properly contact a qualified service person 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
9. ement 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 1 Loose connection to thermostat or system 2 Cooling system requires service or thermostat 3 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 www white rodgers com Symptom Possible Cause Corrective Action Heat Cool or Fan Runs Constantly Possible short in wiring 1 Possible short in thermostat 2 Possible short in heat cool fan system 3 FAN Switch set to Fan ON 4 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 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 1 the Heating System may be influencing
10. n and operation of the thermostat buttons Your thermostat consists of two parts the thermostat body and the base To remove the body gently pull it straight out from the base To replace the body line up the body with the base and press gently until the body snaps onto the base The Thermostat Buttons and Switches 1 Up arrow Raises temperature setting 2 Down arrow Lowers temperature setting 3 FAN switch ON AUTO 4 SYSTEM switch COOL OFF HEAT The Display 5 is displayed when the SYSTEM switch is in the HEAT posi tion is displayed non flashing when the SYSTEM switch is in the COOL position is displayed flashing when the compressor is in lockout mode 6 Displays current temperature 7 is displayed when the 2 AAA batteries are low and should be replaced Nothing else will be displayed Earlier models display LO BATTERY Refer to 37 7006 8 Displays currently set temperature this is blank when SYSTEM switch is in the OFF position 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 SETPOINT STORAGE You can enter both your heating and cooling setpoints at the same time There is no need to re enter the thermostat at the beginning of each season TEMPERATURE SETTING Press or until the display shows the temperature you want
11. one at a time DO NOT LET WIRES FALL BACK INTO THE WALL 6 Install new thermostat using the following procedures 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 PART NO 37 6599B Replaces 37 6599A 1026 Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and or property damage Assemble tools required as shown below WIRE CUTTER STRIPPER Base Back of Thermostat Body RC G RH Y O B W W904 W905 Mounting Hole Mounting Hole Figure 1 Thermostat W904 clip for Celcius display W905 clip for hydronic system NOTE Earlier models refer to 37 7006 for jumper locations HAND OR POWER DRILL WITH 3 16 INCH DRILL BIT IF NEEDED FLAT BLADE SCREWDRIVER Installation Instructions for Heating amp Air Conditioning 1E78 Non Programmable Thermostat YOUR THERMOSTAT REPLACES Typical System Compatibility Chart 1E78 Standard Heat Only Two Wire Gas or Oil Fired Systems 24 volt Yes Electronic Ignition Heat Only Two Wire Systems 24 volt Yes Electronic Ignition Heat Only Gas or Oil Fired Systems 24 volt Yes Standard Heat Cool Systems 24 volt Yes Heat Cool Systems Electric Heat 24 volt Yes Heat Only Electric Heat Systems 24 volt Yes Cool Only Systems 24 volt Yes Heat Pump Systems No Aux or Emergency He
12. perty damage may occur TERMINAL CROSS REFERENCE CHART New Thermostat Terminal Designation Other Manufacturers Terminal Designation RH RC G W Y 4 R G W Y RH R G W Y M V F H C R5 G 4 Y6 R G W Y These are four wire single transformer systems Factory installed jumper wire between the RH and RC terminals must remain in place www white rodgers com NOTE To prevent static discharge problems touch side of thermostat to release static build up before touching any keys 5 CHECK THERMOSTAT OPERATION 4 MOUNTING AND WIRING CONTINUED FROM SECOND PAGE RH 24 VAC 120 VAC Hot Neutral THERMOSTAT SYSTEM G W Figure 2 Typical wiring diagram for heat only 3 wire single transformer systems TRANSFORMER Heating System Fan Relay Y RC JUMPER WIRE O B For 2 wire Heat only attach to RH and W NOTE RH Y 24 VAC 120 VAC Hot Neutral TRANSFORMER THERMOSTAT SYSTEM G W Figure 3 Typical wiring diagram for cool only 3 wire single transformer systems Cooling System Fan Relay RC O B JUMPER WIRE RH Y 24 VAC 120 VAC Hot Neutral THERMOSTAT SYSTEM G W Figure 4 Typical wiring diagram for heat cool 4 wire single transformer systems TRANSFORMER Heating System Fan Relay Cooling System RC JUMPER WIRE O B RED jumper wire provid
13. ric Co The Emerson logo is a trademark and service mark of Emerson Electric Co Homeowner Help Line 1 800 284 2925 www white rodgers com www emersonclimate com
14. 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 and at the same time for two seconds with the SYSTEM switch in HEAT position The display will alternately show L AND FF off 2 Press or to change FF to ON 3 Move SYSTEM switch to OFF to exit the feature Figure 8 Thermostat display buttons and switches 5 CHECK THERMOSTAT OPERATION CONTINUED FROM THIRD PAGE www white rodgers com ELECTRICAL DATA Electrical Rating 0 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 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 and at the same time while moving the SYSTEM switch from OFF to HEAT This also resets the factory defaults If the thermostat has power has been reset and still does not function correctly 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 alk
15. uits 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 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 ELEC GAS switch see fig 1 and switch it to the ELEC 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 Attach Thermostat Base to Wall
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