Emerson 1F82-261 Heat Pump User Manual
Contents
1. If a voltage spike or static discharge occurs use the Reset Operation listed above2. 2 With the thermostat set to Heat or Cool press HOLD for five seconds time will show 3 00 hours as a setting reminder 3 HOLD on the display will blink Release the HOLD button after the temporary hold time is displayed 4 Use O or to set the temperature to your prefer ence The thermostat will maintain this temperature setting for 3 hours with HOLD blinking to remind you it is in Temporary Hold After 3 hours the thermostat will go back to the program temperature and HOLD will no longer blink or display 2 Select FA or SL Fast or Slow Heat Pump stage Cycle Rate The FA setting is used to produce shorter heating cycles The SL setting produces a longer heating cooling cycle Both settings produce very accurate temperature control and can be set to your personal preference FA cycles the system just under 75 F and the SL setting cycles at approximately 1 2 F 3 Select FA or SL Fast or Slow Auxiliary or Emergency Cycle Rate The FA setting is frequently used for gas oil or electric heat The SL setting produces a longer heating cycle Both settings produce very accurate temperature control and can be set to your personal preference FA cycles the system just under 6 F and the SL setting cycles at approximately 1 F Configuration Menu Step 1 PRGM HOLD and RUN 0 00 Press Button s Displayed Factory Default Press O or to select 0 to 8 hrs in 15 minute increments 2 HOLD o FA SL 3 HOL
3. 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 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 if the compressor lock out option is selected in the configuration menu Item 7 Heat Cool or Fan Runs Constantly AUN 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 below 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 the Heating System may be influencing the cycle rate Item 2 in the Configuration Menu is the adjustment that controls the cycle rate If an acceptable cy
4. 3 Press O or 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 or 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 temperature mode 5 Press PRGM once The currently programmed start time and setpoint temperature for the 2nd heating program period will appear 6 Repeat steps 3 and 4 to select the start time and heating temperature for the 2nd heating program period 7 Repeat steps 3 through 5 for the 3rd and 4th heating program periods 8 Press PRGM once SA indicating Saturday program will appear in the display along with the start time for the 1st heating period and the currently programmed temperature 9 Repeat steps 3 through 7 to complete Saturday heating programming 9 Press PRGM once to change to SU Sunday heating programming and repeat steps 3 through 7 to complete Sunday programming 11 When you have completed entering your heating program press RUN Enter Cooling Program CAUTION If the outside temperature is below 50 F disconnect power to the cooling system before programming Energizing the air conditioner compressor during cold weather may cause personal injury or property damage 1 Move SYSTEM switch to COOL position 2 Follow Enter Heating Program for e
5. Heating Cooling Schedule Plan WEEKDAYS SATURDAY 1 Day 5 Day Start Start Temp Time Temp Time SUNDAY 1 Day Start Time D i oj 3 n 3a z 4 4 me COOL HEAT Use the table to plan your program time periods and the temperatures you want during each period Fill in the complete table to have a record of your programs Entering Your Program Set Current Time and Day 1 Press TIME button once The display will show the hour only 2 Press and hold either or until you reach the correct hour and AM PM designation AM begins at midnight PM begins at noon 3 Press TIME once again The display window will show the minutes only 4 Press and hold either O or until you reach the correct minutes 5 Press TIME once again The display will show the day of the week 6 Press O or until you reach the current day of the week 7 Press RUN once The display will show the correct time and room temperature alternately Enter Heating Program 1 Move the SYSTEM switch to HEAT 2 Press PRGM once MO TU WE TH FR indicating weekday program will appear in the display Also displayed are the currently programmed start time for the 1st heating period and the currently programmed temperature flashing EXAMPLE This display window shows that for the 1st weekday period the start time is 6 00 AM and 68 is the programmed temperature this example reflects factory preprogramming
6. or low voltage have it inspected by a qualified heating and air condi tioning contractor or electrician Do not use on circuits exceeding specified voltage Higher voltage will damage control and could cause shock or fire hazard Do not exceed the specification ratings Do not short out terminals on gas valve or primary control to test Short or incorrect wiring will damage oe thermostat and could cause personal injury and or This control is a precision instrument and should be handled property damage carefully Rough handling or distorting components could cause the control to malfunction Thermostat installation and all components of the CAUTION system shall conform to Class Il current limited circuits per the NEC code Failure to do so could cause To prevent electrical shock and or equipment dam a fire hazard age disconnect electric power to system at main fuse or circuit breaker box until installation is complete All wiring must conform to local and national electrical codes and ordinances SPECIFICATIONS ELECTRICAL DATA APPLICATIONS Electrical Rating For use with the following Class II systems 20 to 30 VAC 50 60 Hz or D C e Standard heat pump systems with electric gas or oil Aux 0 05 to 1 0 Amps Load per terminal heat with 24VAC Hot and Common available 1 5 Amps Maximum Total Load All terminals combined e Single stage heat pump systems with no Aux heat with THERMAL DATA 24VAC Hot and
7. Common available Setpoint Temperature Range DO NOT USE WITH 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 4F to 149 F e Millivolt systems e Systems exceeding 30 VAC and 1 5 amps e 3 wire zoned hydronic heating systems Ss PART NO 37 6175E EMERSON www white rodgers com Replaces 37 6175D Climate Technologies 0811 INSTALLATION REMOVE OLD THERMOSTAT 1 Shut off electricity at the main fuse box until installation is complete Ensure that electrical power is disconnected 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 thermo stat and the wall mounting plate as an assembly Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat Disconnect the wires from old thermostat one at a time DO NOT LET WIRES FALL BACK INTO THE WALL Install new thermostat using the following procedures 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 nonabsorbent gloves take up the spilled mercury and place into a container which can be sealed If a cell becomes damaged the unit should be dis carde
8. second stage In the RUN mode if the temperature is manually raised by 3 F 2 C or more above room temperature using O and the fast second stage feature is enabled FA on the second stage will energize immediately With FA off the second stage will not energize until the setpoint temperature is 10 F or more above room temperature SAMPLE Heating Cooling Schedule Plan Factory Program 5 Day 1 Day 1 Day MEE Fano s00 am 62 F eon am o2 Fano 500pm 70F 500 Pu 70 Fano s00 av esr soo am as Fano s00 Pm eF 5 00pm ror 2 3 kei 70 qn 8 00 AM 62 nq 5 00 PM 10 00 PM 70 62 F 6 00 AM 78 8 00 AM 5 00 PM 85 78 F nq 10 00 PM 82 F 6 00 am 70 F 8100 aM 62 F 6 00 PM 70 10 00 Pm 62 F 6100 am 72 F 8100 aM a5 F 6 00 PM 72 F 10 00 Pm 82 F MANUAL OPERATION HOLD TEMPERATURE With the SYSTEM switch setto HEAT or COOL momentarily press HOLD button HOLD will be displayed Use O or to adjust the temperature The thermostat will hold the room temperature at the selected setting until you press RUN button to start pro gram operation again TEMPERATURE OVERRIDE Press O or until the temperature you want is displayed The thermostat will override current programming and keep the room tempera ture at the selected temperature until the next program period begins Then the thermostat will automa
9. 1F82 261 White y Programmable Electronic Digital Heat Pump Thermostat Rodgers INSTALLATION AND OPERATION INSTRUCTIONS Operator Save these instructions for future use FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND OR PROPERTY DAMAGE DESCRIPTION Your new 5 Day 1 Day 1 Day Digital Thermostat uses the tech LCD continuously displays set point and alternately dis nology of a solid state microcomputer to provide precise time plays time and room temperature temperature control This thermostat offers you the flexibility to Continuous Backlit display option design heating and cooling programs that fit your needs Temperature override until next program period Features Manual program override HOLD temperature Separate 5 day weekday and 1 day 1 day Saturday Sunday Temporary HOLD programming with four separate time temperature periods per day F C convertibility e Simultaneous heat and cool program storage Temperature range 45 to 90 F e Preprogrammed temperature control R C Y W2 G O B E and L terminals for single or two Optional battery back up for AC power loss transformer systems e e e e e e e e PRECAUTIONS This thermostat is intended for use with a low voltage NEC Class Il system Do not use this thermostat with a line voltage system WARNING If in doubt about whether your wiring is millivolt line
10. D EMER SL FA 4 HOLD d L OFF on 5 HOLD E OFF on 0 to 1950 hours HOLD Filter 000 in 50 hour increments COMMENTS Select temporary Hold time Select FA or SL Fast or Slow pump cycle rate Select FA or SL Fast or Slow Auxiliary and Emergency Aux heating cycle rate Select display backlight OFF or ON Select Energy Management Recovery OFF or ON Select filter replacement run time Select Compressor lockout OFF or ON 7 HOLD LOC on OFF HOLD OHI 4LOto 0 4 HI z on RUN 11 Select temperature display adjustment higher or lower Select temperature display to F or C Select fast second stage ON or OFF Returns to normal operation Press HOLD to advance to next item or TIME to move backwards to previous item 5 4 Select backlit display The display backlight improves display contrast in low lighting conditions Selecting back light ON will keep the light on continuously Selecting OFF will keep the light off 5 Select Energy Management Recovery OFF or ON Energy Management Recovery EMR causes the thermo stat to start heating or cooling early to make the building temperature reach the program setpoint at the time you specify 6 Select filter replacement run time The thermostat will display FLTR after a set time of operation This is a reminder to change or clean your air filter This time can be set from 0 to 1950 hours in 50 hour increments A selection of 000 will cancel this feat
11. MMONS MUST Limit or Limit or BE JUMPERED TOGETHER Safety Safety Switches Switches HOT Changeover Relay is energized in COOL when O B switch is in the O position Changeover Relay is energized in HEAT when O B switch is in the B position COMMON Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency NEUTRAL Heat Pump Transformer Class Il Current Limited Figure 4 Typical wiring diagram for two transformer systems with safety circuits in BOTH systems CHECK THERMOSTAT OPERATION If at any time during testing your system does not operate properly contact a qualified service person Turn on power to the system Fan Operation If your system does not have a G terminal connection skip to Heating System 1 Move fan switch to ON position The blower should begin to operate 2 Move fan switch to AUTO position The blower should stop immediately Heating System 1 Move SYSTEM switch to HEAT position If the auxiliary heating system has a standing pilot be sure to light it 2 Press O to adjust thermostat setting to 1 above room temperature The Heat Pump system should begin to oper ate However if the Flame icon and Snowflake icon are flashing the compressor lockout feature is operating see Configuration menu item 7 3 Adjust temperature setting to 4 above room temperature The auxiliary heat system should begin to operate and the Flame icon will be flash
12. cle rate is not achieved using the FA Fast or SL Slow adjustment 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 or the size of the Cooling System may be influencing 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 Thermometer Disagree Thermostat thermometer setting requires adjustment The thermometer can be adjusted 4 degrees as listed in item 8 of the Configuration Menu No other adjustment is possible Clock Loses or Gains Time Loss of power to thermostat The thermostat will maintain its program in memory even with no power but the clock time will be incorrect when power is restored See No Heat No Cool No Fan common problems above for items to check in the system Heat or Cool Starts Early EMR activated See Configuration Menu Item 5 Thermostat Does Not Follow Program AM or PM set incorrectly in program AM or PM set incorrectly on the clock Voltage spike or static discharge Check current clock and program settings including the AM or PM designations for each time period If a voltage spike or static discharge occurs use the Reset Operation listed above Blank Display and or Keypad Not Responding Voltage Spike or Static Discharge
13. d Mercury must not be discarded in household trash When the unit this product is replacing is to be discarded place in a suitable container Refer to www white rodgers com for loca tion to send the product containing mercury 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 Connect wires beneath terminal screws on base using appropriate wiring schematic see figs 2 through 4 Place base over hole in wall and mark mounting hole locations on wall using base as a template Move base out of the way Drill mounting holes Fasten base loosely to wall as shown in fig 1 using two mounting screws Place a level against bottom of base 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 Push excess wire into wall and plug hole with a fire resistant material such as fiberglass insulation to prevent drafts from affecting thermostat operation ELECTRIC GAS JUMPER Fan Option Read the following information before clipping the nonelectric heat jumper If you are unsure of your application contact a qualified service person If your emergency or auxiliary syst
14. em will energize the blower then jumper W904 on the thermostat base must be cut see fig 1 If your emergency or auxiliary heat system requires that the thermostat energize the fan circuit do not cut jumper W904 OPTIONAL BATTERIES With two AA batteries installed your thermostat will maintain time and continuously display the temperature during a loss of 2 Optional 2 AA batteries Screw anchors O B switch Mounting hole Reset switch below F itch below Fan switch W904 Mounting Electric Gas hole jumper Figure 1 Thermostat Base AC power Installed batteries will also allow programming prior to installation For best results use new premium brand batteries such as Duracell or Energizer ENERGY MANAGEMENT RECOVERY EMR When the EMR feature is activated the thermostat s microcom puter calculates the time it will take to change the room temperature to the next heat or cool program setting Then the thermostat will start the system before the next programmed period so that the desired temperature is reached at or near the beginning of the period the thermostat calculates 15 minutes for every 1 F temperature change This minimizes the use of auxiliary stages during the transition period to reduce energy costs For example The thermostat is programmed to provide an overnight heating temperature of 66 F and during the next program period beginning at 6 00 AM the programmed tem p
15. erature is 70 F With EMR activated the thermostat will automatically start the heating system at 5 00 AM so that the programmed temperature of 70 F is reached by about 6 00 AM If the overnight room temperature drops only to 68F the thermostat will start the system at 5 30 to reach the programmed temperature of 70 F at 6 00 The thermostat is shipped with the EMR feature active which means that the thermostat will start the heating system before the beginning of the next program period This feature provides better efficiency by allowing gradual temperature changes using only the first stage of heat To deactivate the EMR function see the Configuration menu on Page 5 The thermostat will then wait until the programmed time to start the system for a temperature change O B TERMINAL SWITCH SELECTION The O B switch on this thermostat is factory set to the O position This will accommodate the majority of heat pump applications which require the changeover relay to be ener gized in COOL If the thermostat you are replacing or the heat pump being installed with this thermostat requires a B termi nal to energize the changeover relay in HEAT the O B switch must be moved to the B position THERMOSTAT SYSTEM SYSTEM MONITOR SWITCH Changeover Relay is energized in COOL when O B switch is in the O position Neutral Changeover Relay is energized in HEAT when O B switch is in the B
16. ing 4 Press to adjust temperature setting below room tem perature The heating system should stop operating OPERATION 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 con sists of two parts the thermostat cover and the base To remove the cover pull it straight out from the base To replace the cover line up the cover with the base and press until the cover snaps onto the base THE THERMOSTAT BASE Other than and the following buttons and switches are located on the bottom of the thermostat cover see fig 5 The Thermostat Buttons and Switches Raises temperature setting Lowers temperature setting 8 TIME button PRGM program button RUN program button HOLD temperature button T FAN switch ON AUTO 8 SYSTEM switch COOL OFF HEAT EMER Emergency System EMER bypasses the Heat Pump to use the heat source wired to terminal E on the thermostat EMER is typically used when compressor operation is not desired or you prefer back up heat only 1 Move SYSTEM switch to EMER position EMER will flash on the display 2 Press G to adjust the thermostat above room tempera ture The Aux heating system will begin to operate The Flame icon 2 will display flashing to indicate that the Aux system is operating 3 Press to adjust the thermostat below
17. ntering your cooling program using your selected cooling times and tempera tures 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 Saturday and Sunday 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 program Move SYSTEM switch to HEAT or COOL and press RUN to begin program operation NOTE Batteries are not required to keep your programming or menu data With two optional AA batteries installed your thermostat will maintain time and continuously display the temperature during a loss of AC power Installed batteries will also allow programming prior to installation OF ON oa YOUR THERMOSTAT IS NOW PROGRAMMED AND READY TO PROVIDE MAXIMUM COMFORT AND EFFICIENCY HOMEOWNER HELP LINE 1 800 284 2925 White Rodgers is a division of Emerson Electric Co www white rodgers com The Emerson logo is a trademark and a service mark of Emerson Electric Co TROUBLESHOOTING Reset Operation If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation reset the
18. position TRANSFORMER Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency Class II Current Limited Figure 2 Typical wiring diagram for single transformer systems If safety circuits are in only one of the systems remove the transformer of the system with NO safety circuits THERMOSTAT CUTAND _ YY NN N N SYSTEM TAPE OFF SYSTEM MONITOR Limit or SWITCH Safety Switches Neutral Fs N TWO COMMONS MUST TRANSFORMER Changeover Relay is energized in COOL when O B switch is in the O position BE JUMPERED TOGETHER Changeover Relay is energized in HEAT when O B switch is in the B position Class II Current Limited Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency Figure 3 Typical wiring diagram for two transformer systems with NO safety circuits Polarity must be observed If the HOT side of the second transformer is jumpered to the COMMON side of the first transformer a short will be made Damage to equipment will occur when power is restored e 8 w2 lt ee Limit or Limit or Safety Safety Switches SYSTEM Switches MONITOR NEUTRAL SWITCH 24 VAC Auxiliary le ACCESSORY Heating Compressor RELAY N O Transformer The accessory relay scheme J CONTACT Sure nied is required when safety circuits exist in both systems COMMON d Two CO
19. room tempera ture The Aux heating system should stop operating Cooling System CAUTION To prevent compressor and or property damage if the outdoor temperature is below 50 F DO NOT operate the cooling system 1 Move SYSTEM switch to COOL position 2 Press to adjust thermostat setting below room tempera ture The blower should come on immediately on high speed followed by cold air circulation 3 Press O to adjust temperature setting above room tem perature The cooling system should stop operating CAUTION Do not allow the compressor to run unless the com pressor oil heaters have been operational for 6 hours and the system has not been operational for at least 5 minutes MO TU WE TH FR rt LULO SA SU MALF Ww 1 a ee 1 mi Figure 5 Thermostat display buttons and switches The Display Indicates day of the week 0 indicates a malfunction with the system Flame icon is displayed when the SYSTEM switch is in the HEAT position Flame icon is displayed flashing when 2nd stage heat Aux or Emergency is energized Snowflake icon is displayed non flashing when the SYSTEM switch is in the COOL position Snowflake and Flame are displayed flashing if the thermostat is in lockout mode to prevent the compressor from cycling too quickly EMER is displayed flashing when the system switch is in EMER position E Alternately displays current time and tempera
20. thermostat by Symptom No Heat No Cool No Fan common problems pressing the reset switch see Fig 1 If the thermostat has chase Possible Cause 1 2 Blown fuse or tripped circuit breaker Furnace power switch to OFF 3 Furnace blower compartment door or panel loose or not properly installed power has been reset and still does not function correctly contact your heating cooling service person or place of pur Corrective Action Replace fuse or reset breaker Turn switch to ON Replace door panel in proper position to engage safety interlock or door switch No Heat System Switch not set to Heat Loose connection to thermostat or system Heating System requires service or thermostat requires replacement Set System Switch to Heat and raise setpoint above room temperature Verify thermostat and system wires are securely attached Diagnostic Set System Switch to Heat and raise the setpoint above room temperature Within a five minutes the thermostat should make a soft click sound This sound usually indicates the thermostat 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 system is operating correctly
21. tically revert to the program TEMPORARY HOLD TEMPERATURE The thermostat can hold any temperature within its range for the length of time selected in the configuration menu See Configuration Menu section step 1 PROGRAMMING YOUR THERMOSTAT This section will help you plan your thermostat s program 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 tem peratures 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 Planning Your Program Look at the factory preprogrammed times and temperatures shown in the sample schedule 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 program You must program four periods for each day However you may use the same heating and cooling temperatures for consecutive time periods You can choose start times heating tempera tures and cooling temperatures independently 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
22. ture The word HOLD is displayed when the thermostat is in the HOLD mode HOLD is displayed flashing when the thermo stat is in a temporary HOLD Mode 5 Displays currently programmed set temperature this is blank when SYSTEM switch is in the OFF position Displays FLTR when the system has run for the pro grammed filter time period as a reminder to change or clean your air filter CONFIGURATION MENU The configuration menu allows you to set certain thermostat operating characteristics to your system or personal require ments Press RUN to make sure the thermostat is in the run program mode then press PRGM and RUN at the same time to enter the configuration menu The display will show the first item in the configuration menu The configuration menu chart summarizes the configuration options An explanation of each option follows Press HOLD to change to the next menu item or press TIME to go backwards to the previous item in the menu To exit the menu and return to the program operation press RUN If no keys are pressed within fifteen minutes the thermostat will revert to normal operation 1 Select Temporary Hold Time The thermostat can hold any temperature you set it to for the amount of time you select on this option Your choices are 0 00 to 8 00 hours in 15 minute increments 0 00 disables the function Example Using the Temporary Hold Function 1 You have selected 3 00 hours for the Temporary Hold time period
23. ure When FLTR is displayed you can clear it by pressing HOLD and RUN at the same time This resets the timer and starts counting the hours until the next filter change Contact your heat pump manu facturer for a specific replacement maintenance interval 7 Select Compressor Lockout LOC OFF or ON Selecting LOC ON will cause the thermostat to wait 5 minutes before turning on the compressor if the heating and cooling sys tem loses power It will also wait 5 minutes minimum between cooling or heating cycles This is intended to help protect the compressor from short cycling Some newer compressors already have a time delay built in and do not require this feature Your compressor manufacturer can tell you if the lockout feature is already present in their system When the thermostat compressor time delay occurs it will flash the Snowflake and Flame icons for about five min utes 8 Select Temperature Display Adjustment 4 LO to 4 HI Allows you to adjust the room temperature display up to 4 higher or lower Your thermostat was accurately calibrated at the factory but you have the option to change the display temperature to match your previous thermostat The cur rent or adjusted room temperature will be displayed on the right side of the display 9 Select F or C Readout Changes the display readout to Celsius or Fahrenheit as required The current room tem perature will be displayed on the right side of the display 10 Select Fast
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