American Standard ASYSTAT656 User manual

OPERATION GUIDE
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ASYSTAT656
12-5014-02
Programmable Electronic
Set-Back Thermostat for
Single and Multistage
Heatpumps

2
AboutYour 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.

3
InThis Guide . . .
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 ................. 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
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4
YOUR NEW THERMOSTAT’S FEATURES
• Separate5-day(weekday)and2-day(week-
end) setback programming
• Simultaneous heat and cool program stor-
age
• Fourseparatetime/temperaturesettingsper
24-hour period
• Computed Energy Management Recovery
(EMR)
• Automaticchangeover(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)
• Compressor short cycle protection
• Programmable blower control
• Blower delay OFF in the cooling cycle
• Audio and visual prompting during operation
• Two hour temperature override
• Manual program override (HOLD tempera-
ture)
• "Advance Program" button
• °F/°C convertibility
• Temperature range 40° to 99°F
• Adjustable cycle times
• Backlit LCD displays continuous setpoint,
time, and room temperature
• Up to 3 stages of heat (electric heat and 2
heat pump) and up to 2 stages of cool

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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 sec-
tion 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.
Disconnect power from the system at
the circuit breaker/fuse box BEFORE re-
movingorattachingthethermostatbody.
Equipment damage and/or personal in-
jury could occur.
Thesubbaseis attachedtothewall,but youcan
remove the thermostat body for easy program-
ming. To remove the thermostat body from the
subbase, grasp the thermostat body and gently
pull it out from the bottom of the subbase, then
pivot up. To attach the thermostat body, line up
the four terminal pins on the lower section of the
thermostatbackwiththematchingconnectoron
the subbase. Insert these, then gently pivot the
thermostat body up to connect the nine pin
CAUTION
!

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Ifpowerlossis longenoughfortheprogram to
be lost, the thermostat will automatically re-
turn to the factory programmed temperatures
(64°F heating and 82°F cooling) when power
is restored. You must reprogram the thermo-
stat if this happens.
If the word BAT is flashing in the display
window, the battery is low and should be
replaced with a fresh 9 volt alkaline battery.
The battery will provide power for all functions
except the display light which works only on
24VAC power.
Beforeremovingthermostatfromthewallto
replace the batteries, DISCONNECT 24VAC
power from the thermostat at the breaker/
fuse box. Backlight will not come on when
24VAC power has been disconnected.
connectors on the upper portion of the thermo-
stat back. Gently push until the snap connec-
tors 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
the9voltalkalinebatteryandtheoptionswitches.
See INSTALLERS GUIDE for option switch op-
eration.
1. The9voltalkalinebatteryprovidespowerto
the thermostat when the 24VAC power is
interrupted (for example, when you remove
the thermostat from the wall for program-
ming). A fresh battery will maintain the
storedprogramforapproximatelyoneweek.
CAUTION
!

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2. You may adjust the option switch #4 for auto-
maticchangeoverfromheattocool(see OPER-
ATING FEATURES).
Other than and , the buttons are located
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.
BACK OF THERMOSTAT BODY
W18

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The word BAT flashes on the display when
the 9V alkaline battery is weak and should
be replaced.
FAN is displayed when the blower is
operating continuously, REGARDLESS OF
HEATING OR COOLING SYSTEM CY-
CLING. FAN is displayed during auto-
maticfanoperation(whentheblowercycles
with the heating or cooling system).
The Display
Continuouslydisplayssystemmode(HEAT,
OFF, EMER, COOL, AUTO, HOLD). Dur-
ing programming, the program period is
displayed (MOR, DAY, EVE, or NHT).
Alternately displays room temperature (F
denotesdegreesFahrenheit andCdenotes
degrees Celsius) and time of day (Ade-
notes AM time and Pdenotes PM time).
Displays the setpoint temperature.
5 DAY indicates that the displayed program
is the weekday program. 2 DAY indicates
that the displayed program is the weekend
program.
1
2
3
4
6
5

9

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The Thermostat Buttons
Sets the system mode (HEATing,
EMERgency backup, OFF, COOLing, or
AUTOmatic changeover).
Selects fan operation (see #6, above). This
buttonisalsousedtoprogramthe fantorun
continuously during a program period.
Runs display forward or backward through
time, day, or anticipation settings during
programming.
Used with the
TIME
FWD
and
TIME
BACK
buttons to set
current time and day of the week.
Used during programming to set the day of
the week.
Used to initiate or review thermostat pro-
gramming.
8
7
9
10
11
12
Used to start program operation after pro-
gramming. Also used to return thermostat
to program operation after being in HOLD
mode.
Used to manually override programming to
holdataselectedtemperature(when HOLD
is displayed).
Used to advance thermostat program to the
next program period (for example, from the
MOR program to the DAY program).
(Red arrow) Raises temperature setting
(99°F or 37°C maximum).
(Blue arrow) Lowers temperature setting
(40°F or 4°C minimum).
Red EM.HT. light indicates the system is in
the emergency mode (the heat pump
compressor is off and the auxiliary system
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17
16
15
14
13

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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.
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

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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.
•AUTOMATIC CHANGEOVER — You can
set the thermostat to automatically switch
thesystemfromheatingtocoolingasneeded.
First, you must move option switch #4 (lo-
catedonthebackofthethermostatbody)to
the ON position, if it has not already been
done. Todothis, turnOFF24VAC powerto
thethermostat.Thenremovethethermostat
body from the wall. Check the position of
switch #4 (the last switch on the right). If it
isON,simplyputthethermostatbackonthe
wallandrestore24VACpower. Iftheswitch
OPERATING FEATURES
Now that you are familiar with the thermostat
display and buttons, read the following informa-
tion 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.
Then the thermostat will activate the heat-
ing or cooling system to change the tem-
perature so that the desired temperature is
reached at the beginning of the next pro-
gram period. As an example of this feature,
assume that you have programmed your
thermostat to provide an overnight heating
temperature of 62°F, and that during the

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In the AUTO mode, the thermostat will not allow the
temperature separation between the highest heat
setting and the lowest cool setting to be less than
1°F. Forexample,ifthe highestheatsettingis75°F,
the lowest cool setting cannot be below 77°F (see
diagram below).
set at installation (DO NOT CHANGE)
set at installation (DO NOT CHANGE)
set at installation (DO NOT CHANGE)
ON
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
thebatteryoutofthethermostatforatleasttwo
minutes,toallowthethermostat to resetitself.
DO NOT MOVE ANY OTHER OPTION
SWITCH, as it may affect thermostat opera-
tion. See INSTALLERS GUIDE for more infor-
mation. Replace the battery, reprogram the
thermostat, if necessary, put the thermostat
back on the wall, and restore 24VAC power.
Tosetthethermostatforautomaticchangeover
afterprogramming,press the SYSTEMbutton
to set the thermostat to AUTO (the setpoint
display is blank in the AUTO mode). The
system will now automatically switch between
heating and cooling, depending on the actual
room temperature.
79
78
77
76
75
74
73
COOLING TEMPERATURES
HEATING TEMPERATURES
DEAD BAND 1
o
F

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•TWO HOUR TEMPERATURE OVERRIDE
Press or until the display shows
the temperature you want. The thermostat
will override current programming and keep
the room temperature at the selected tem-
perature 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 tem-
perature by pressing or . The
thermostat will hold the room temperature at
the selected setting until you press
RUN
PRGM
to
start program operation again. This feature
is ideal for energy conservation when the
building is unoccupied for an extended pe-
riod of time.
•°F/°C CONVERTIBILITY — Press
TIME
FWD
and
TIME
BACK
at the same time until the temperature
display is in °C (Celsius). To display °F,
repeat the process.
•LOW BATTERY INDICATOR — The word
BAT willflash onthe display when the battery
is low and should be replaced.
•AUDIOPROMPTING—Eachtimeyoupress
a button, the thermostat will beep.
•BACKLIT DISPLAY — When you press any
button on the thermostat, the display is lit for
approximately eight seconds (this feature
works only when the thermostat is attached to
the wall and 24VAC power is present to the
thermostat).

15
•COMPRESSOR SHORT CYCLE PROTECTION
To protect your compressor from potential dam-
age 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
modes.
c) Pressing , creating a call for COOL too
soon after a previous call.
During lockout in the HEAT or COOL mode, the
green compressor (PUMP) STG 1 LED will flash.
During lockout in the COOL mode, the blower will
operate, but compressor operation will be delayed.
Auxilary heat is functional during the compressor
lockout and will be used as needed to maintain
room temperature.

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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.Tooverrideconstantfan,press
FAN button until FAN ■■
■■
■ disappears from dis-
play and FAN appears.
•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.
•PROGRAMMABLEBLOWERCONTROL-You
may program the fan blower to run continuously
NOTE

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PROGRAMMING YOUR THERMOSTAT
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
followingguidelines inmind when planning your
program.
• When heating (cooling) your building, pro-
gramthetemperaturestobecooler(warmer)
when the building is vacant or during peri-
ods of low activity.
• During early morning hours, the need for
cooling is usually minimal.
PLANNING FOR YOUR NEEDS
First,answerthefollowingquestionstohelp you
decidewhatyourneedsare. Ifyouareusingthe
thermostatforacommercialapplication(astore,
officebuilding,etc.),answerquestions5through
8. If you are using the thermostat in your home,
answer questions 1 through 4.
IN YOUR HOME:
1a. Whattime does thefirstpersongetupinthe
morning?
b. What temperature should the house be at
this time? These will be your MOR (morn-
ing) temperature settings.
PROGRAMMING

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2a. What time does the last person leave the
house in the morning?
b. What temperature should the house be at
this time? Thesewillbeyour DAY tempera-
ture settings.
3a. What timedoesthe firstperson arrive home
in the evening?
b. What temperature should the house be at
thistime? ThesewillbeyourEVE (evening)
temperature settings.
4a. What time does the last person go to bed at
night?
b. What temperature should the house be at
this time? These will be your NHT (night)
temperature settings.
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
amaximumactivitylevel(usinglights,equip-
ment, meeting rooms, etc.)?
b. What temperature should the building be at
this time? Thesewillbeyour DAY tempera-
ture settings.
7a. What time do the building occupants reach
a minimum activity level (limited personnel
in building)?
PROGRAMMING

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To operate properly in the AUTO mode, there
must be a minimum 1°F separation between
the highest heat temperature and the lowest
cool temperature (see diagram below).
79
78
77
76
75
74
73
COOLING TEMPERATURES
HEATING TEMPERATURES
DEAD BAND 1
o
F
NOTE
b. What temperature should the building be at
thistime? ThesewillbeyourEVE (evening)
temperature settings.
8a. What time does the building become va-
cant?
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
to begin
running the factory preset program.