American Standard ASYSTAT656 Operation Manual

OPERATION GUIDE

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ASYSTAT656

12-5014-02

Programmable Electronic Set-Back Thermostat for Single and Multistage Heatpumps

About Y our 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 . . .

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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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)

• 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 temperature)

• "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

OPERA TING Y OUR THERMOST AT

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.

Disconnect power from the system at the circuit breaker/fuse box BEFORE removing or attaching the thermostat body. Equipment damage and/or personal injury could occur.

The subbase is attached to the wall, but you can remove the thermostat body for easy programming. 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 thermostat back with the matching connector on the subbase. Insert these, then gently pivot the thermostat body up to connect the nine pin

CAUTION

If power loss is long enough for the program to be lost, the thermostat will automatically return to the factory programmed temperatures (64°F heating and 82°F cooling) when power is restored. You must reprogram the thermostat 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.

Before removing thermostat from the wall to 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 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. The 9 volt alkaline battery provides power to the thermostat when the 24VAC power is interrupted (for example, when you remove the thermostat from the wall for programming). A fresh battery will maintain the stored program for approximately one week.

CAUTION

2. You may adjust the option switch #4 for automatic changeover from heat to cool (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

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 CYCLING. FAN is displayed during auto- matic fan operation (when the blower cycles with the heating or cooling system).

The Display

Continuously displays system mode (HEAT, OFF, EMER, COOL, AUTO, HOLD ). Dur-

ing programming, the program period is displayed (MOR, DAY, EVE , or NHT).

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).

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.

The Thermostat Buttons

Sets the system mode (HEATing, EMERgency backup, OFF, COOLing, or AUTOmatic changeover).

Selects fan operation (see #6, above). This button is also used to program the fan to run 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.

Used to start program operation after programming. Also used to return thermostat to program operation after being in HOLD mode.

Used to manually override programming to hold at a selected temperature (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

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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