OPERATION GUIDE ASYSTAT656 Programmable Electronic Set-Back Thermostat for Single and Multistage Heatpumps Homeowner: Save this booklet for future use! 12-5014-02
About Your New Thermostat . . . Your new American-Standard Digital Multi-stage/Heat Pump Thermostat uses the technology of a solid-state microcomputer to provide precise comfort. 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.
In This Guide . . . 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 PROGRAMMING YOUR THERMOSTAT ..................................... 18 PLANNING FOR YOUR NEEDS ENTERING YOUR PROGRAM Set Current Time and Day Enter Heating Program Enter Cooling Program CHECK YOUR PROGRAMMING QUESTIONS AND ANSWERS .................
YOUR NEW THERMOSTAT’S FEATURES • Separate 5-day (weekday) and 2-day (weekend) setback programming • Simultaneous heat and cool program storage • Four separate time/temperature settings per 24-hour period • Computed Energy Management Recovery (EMR) • Automatic changeover (operator-selectable) • Armchair programming capability • Backlit LCD displays continuous set point, time, and room temperature • 9 volt alkaline battery backup • Preprogrammed temperature control • Electric Heat (installer-selectable) 4 •
OPERATING YOUR THERMOSTAT 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. The information in this section will help you become familiar with your new thermostat so that you can easily program it. Your thermostat consists of two parts: the thermostat body and the subbase. The subbase is attached to the wall, but you can remove the thermostat body for easy programming.
connectors on the upper portion of the thermostat back. Gently push until the snap connectors engage. DO NOT FORCE OR PRY THE THERMOSTAT, as this may damage the unit. PARTS OF THE THERMOSTAT The Back of The Thermostat Body Turn the thermostat body over. On the back is the 9 volt alkaline battery and the option switches. See INSTALLERS GUIDE for option switch operation. 1.
2. You may adjust the option switch #4 for automatic changeover from heat to cool (see OPERATING FEATURES). and , the buttons are located Other than behind the thermostat door. To open the door, put your fingernail in the indentation at the top of the door, then pull the door out from the top and swing it down on its hinges. On the following pages are brief descriptions of the display and the thermostat buttons.
The Display 1 Continuously displays system mode (HEAT, OFF, EMER, COOL, AUTO, HOLD). During programming, the program period is displayed (MOR, DAY, EVE, or NHT). 2 Alternately displays room temperature (F denotes degrees Fahrenheit and C denotes degrees Celsius) and time of day (A denotes AM time and P denotes PM time). 3 Displays the setpoint temperature. 4 5 DAY indicates that the displayed program is the weekday program. 2 DAY indicates that the displayed program is the weekend program.
The Thermostat Buttons 13 Used to start program operation after programming. Also used to return thermostat to program operation after being in HOLD mode. 7 Sets the system mode (HEATing, EMERgency backup, OFF, COOLing, or AUTOmatic changeover). 8 Selects fan operation (see #6, above). This button is also used to program the fan to run continuously during a program period. 14 Used to manually override programming to hold at a selected temperature (when HOLD is displayed).
is maintaining setpoint temperature - there is a 5 to 10 minute startup delay on the first emergency cycle). A continuous (non-flashing) GREEN STG 1 light indicates that the heat pump compressor is functioning - a flashing GREEN light indicates that the compressor is locked out. An AMBER STG 2 light indicates that the second stage is operating. A flashing AMBER STG 2 light indicates that the third stage heat is operating. A flashing RED light indicates a defrost fault.
OPERATING FEATURES Now that you are familiar with the thermostat display and buttons, read the following information to learn about the many features of the thermostat. • COMPUTED ENERGY MANAGEMENT RECOVERY (EMR) — The thermostat’s microcomputer will be set to automatically calculate the time it will take to change the temperature to the next program setting.
is OFF (down) remove the battery, then use a pencil or small screwdriver to move the switch to the ON position (see figure at right). Leave the battery out of the thermostat for at least two minutes, to allow the thermostat to reset itself. DO NOT MOVE ANY OTHER OPTION SWITCH, as it may affect thermostat operation. See INSTALLERS GUIDE for more information. Replace the battery, reprogram the thermostat, if necessary, put the thermostat back on the wall, and restore 24VAC power.
• TWO HOUR TEMPERATURE OVERRIDE or until the display shows Press the temperature you want. The thermostat will override current programming and keep the room temperature at the selected temperature for two hours. After two hours, 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 program. Press HOLD TEMP HOLD will be dis- played. Then choose the desired hold temor .
• COMPRESSOR SHORT CYCLE PROTECTION To protect your compressor from potential damage due to rapid cycling, this thermostat has a built-in minimum delay of 5 minutes between cooling cycles. The following may cause a time delay in COOL or HEAT: a) Return of power after a power outage. b) Pressing SYSTEM SWITCH to change operating During lockout in the HEAT or COOL mode, the green compressor (PUMP) STG 1 LED will flash.
NOTE • SYSTEM INDICATOR LIGHTS - The three lights on the upper right part of the thermostat indicate system operation (please refer to PARTS OF THE THERMOSTAT) for specific descriptions of what each light indicates. • PROGRAMMABLE BLOWER CONTROL - You may program the fan blower to run continuously 16 during any given program period, regardless of the cycling of the heating or cooling system. During programming, after entering the time and temperature for the time period, press FAN until FAN ■ appears.
PROGRAMMING YOUR THERMOSTAT PROGRAMMING PLANNING FOR YOUR NEEDS Now you are ready to program 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. • When heating (cooling) your building, program the temperatures 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.
FOR COMMERCIAL APPLICATIONS: 5a. What time does the first person arrive at the building in the morning? b. What temperature should the building be at this time (heating/cooling)? These will be your MOR (morning) temperature settings. 6a.What time do the building occupants reach a maximum activity level (using lights, equipment, meeting rooms, etc.)? b. What temperature should the building be at this time? These will be your DAY temperature settings. 7a.
b. What temperature should the building be at this time? These will be your EVE (evening) temperature settings. 8a. What time does the building become vacant? b. What temperature should the building be at this time? These will be your NHT (night) temperature settings. Now look at the factory preprogrammed times and temperatures shown below. If this program will suit your needs, simply press RUN PRGM 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 program. You must program 4 periods for each day (MOR, DAY, EVE, and NHT). However, you may use the same heating and cooling temperatures for consecutive time periods.
WEEKDAY (5 DAY) Start Time MOR HEAT DAY HEAT EVE HEAT NHT HEAT MOR COOL DAY COOL EVE COOL NHT COOL 22 Temperature WEEKEND (2 DAY) Start Time Temperature
WEEKDAY (5 DAY) WEEKEND (2 DAY) Start Time Temperature Start Time Temperature MOR HEAT 5:00 AM 70°F 7:00 AM 68°F DAY HEAT 8:00 AM 65°F 11:00 AM 70°F EVE HEAT 5:00 PM 70°F 6:00 PM 70°F NHT HEAT 10:30 PM 65°F 11:30 PM 65°F MOR COOL 6:30 AM 76°F 7:00 AM 76°F DAY COOL 2:00 PM 78°F 12:30 PM 74°F EVE COOL 5:00 PM 72°F 6:00 PM 72°F NHT COOL 10:30 PM 78°F 11:30 PM 76°F 23
ENTERING YOUR PROGRAM Follow these steps to enter the heating and cooling programs you have selected. Set Current Time and Day 1. Press SET CLOCK once. The display will show minutes only. NOTE We recommend that you remove the thermostat from the wall for programming (especially for entering cooling programming). A fresh 9V alkaline battery must be installed to perform offwall programming.
5. Press SET DAY once. The display will show the day of the week as an abbreviation (MO for Monday, TU for Tuesday, etc.). 6. Press and hold either TIME FWD or TIME BACK until you reach the current day of the week. 7. Press RUN PRGM VIEW programming after this happens, press PRGM until you are at the point where you stopped programming. Then you may continue to enter your programs normally. If you want to stop programming at any time, simply press RUN PRGM to resume program operation. once.
This display window shows that for the weekday MOR period, the start time is 5:00 AM, and 70° is the programmed temperature (this example reflects factory preprogramming). 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 selected MOR heating temperature. 5.
Enter Cooling Program ! CAUTION If outside temperature is below 50°F, we recommend that you remove the thermostat from the wall before proceeding with the following steps to program cooling temperatures. A fresh 9V alkaline battery must be installed to perform off-wall programming. Programming away from the wall should prevent accidental compressor operation. BE SURE SYSTEM SWITCH IS SET TO OFF POSITION BEFORE REATTACHING THE THERMOSTAT TO THE SUBBASE! SYSTEM 1. Press SWITCH until COOL is displayed. 2.
4. Press SYSTEM SWITCH until COOL is displayed. 5. Repeat step 2 to check cooling temperatures. 6. Press RUN PRGM to begin program operation. Press SYSTEM SWITCH until OFF is displayed. Reattach thermostat to subbase. Turn on power to the system. Then press SYSTEM SWITCH to select the operation mode you want (HEAT, COOL, AUTO). Press FAN SWITCH until FAN AUTO is displayed (automatic cycling).
QUESTIONS AND ANSWERS 1. How can I permanently change a part of my program? Press VIEW PRGM until you reach the time/temperature schedule you want. Then press TIME FWD or TIME BACK and and to change the program. See PROGRAMMING YOUR THERMOSTAT. 2. How can I have no change in temperature from one time period to another? Simply select the same temperature for each consecutive time period.
4. What happens if the electricity goes off or is manually shut off? If you have not installed a 9V alkaline battery, the display will go blank and the program will be lost in approximately one minute. When electricity is restored, the clock will reset itself to 12:00 PM (noon) and the thermostat will maintain a heating temperature of 64°F and a cooling temperature of 82°F until you reenter your program. Setpoint temperature will not be displayed.
until OFF is displayed. Replace the thermostat on the wall. Then press RUN PRGM to begin the factory preset program. Or you may reprogram the thermostat, then replace it on the wall. To prevent further static discharge problems, touch another object to release static build-up before touching the thermostat. Please refer to OPERATING YOUR THERMOSTAT. 7.
use the or buttons to move the temperature above or below the setpoint temperature. Please refer to OPERATING YOUR THERMOSTAT. ! CAUTION If the outside temperature is below 50°F, or button DO NOT use the to move the temperature above or below the setpoint temperature. 10. Why doesn’t the temperature change at the time I programmed? There may be a number of causes for this situation. The following are primary reasons. • The EMR function is operating.
11. Why does the blower fan keep running after the system has turned off? • You have programmed the fan to run continuously during this period. Please refer to PROGRAMMING YOUR THERMOSTAT. • The blower delay feature is operating. This energy saving feature continues to blow conditioned air through the ducts after the system has turned off, rather than letting the air dissipate. 12. Between heating and cooling seasons, I want to turn my system off.
minute if there are no batteries installed or if the installed battery is dead. If you are changing the batteries after seeing a flashing BAT 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. After installing new batteries, follow the procedures in CHECK YOUR PROGRAMMING to determine whether your programming was maintained.
LIMITED WARRANTY LOW VOLTAGE ROOM THERMOSTATS This warranty is extended by American Standard Inc., to the original purchaser and to any succeeding owner of the real property to which the Thermostat is originally affixed, and applies to products purchased and retained for use within the U.S.A. and Canada. If any part of your Thermostat fails because of a manufacturing defect within one year from the date of the original purchase, Warrantor will furnish without charge a new thermostat.
UNDERSTANDING YOUR THERMOSTAT’S LIGHTS Status LED Flashing Green Cool Mode Heat Mode Emergency Mode Compressor L.O. Compressor L.O. N/A Steady Green 1st Stage 1st Stage N/A Steady Amber 2nd Stage 2nd Stage 1st Stg. Aux. Heat Flashing Amber N/A Auxiliary Heat 2nd Stg. Aux. Heat Steady Red N/A N/A Mode Indicator Flashing Red N/A Fault N/A 1 Red LED may appear dimly lit when not in Emergency Mode. 2 A Defrost fault can be cleared by changing to the Emergency Heat Mode.
