TCONT401AN21MA is a digital non-programmable 2Heat/1 Cool/Heat Pump/Heat-Cool wall mounted low voltage (24VAC) Comfort Control with backlit LCD and keypad. It maintains room temperature by controlling the operation of heating, cooling and heat pump systems. The Comfort Control is easily configured for heat pump or cooling only and gas or electric heat applications via the user friendly In-staller Setup menu. The Comfort Control features include separate heating and cooling setpoints, selectable auto or manual changeover, adjustable energy saving mode, adjust-able filter reminder, outdoor temperature sensing, LitePort technology for extended system diagnostics and fault notification. Setup selections and diagnostics are stored indefinitely in the Comfort Controls nonvolatile memory eliminating the need for battery backup.
Safety Considerations
Read the following manufacturer instructions carefully. Follow all local codes during installation. All wiring must conform to local and national electrical codes. Improper wiring or installation may damage comfort control. Recognize safety information. This is the safety alert symbol When you see this symbol on the equipment and in the instruction manual, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which could result in minor personal injury or product and prop-erty damage.
CAUTION
To prevent shortening its service life, the control should not be installed until construction is completed.
Comfort Control – Location
The Comfort Control should be mounted approximately 60” (1.5m) off the floor on an interior partition wall. Never install the Comfort Control on an outside wall. For proper temperature sensing, avoid mounting the Comfort Control where it will be exposed to heat radiated from lamps, sunlight, fireplaces or any other radiant heat sources. Avoid locations close to windows, behind doors or alcoves with poor air circulation, adjoining outside walls, or doors that lead to the outside. Select a location that prevents the Comfort Control from being directly exposed to air currents from supply registers. Mount the Comfort Control on a section of the interior wall that does not contain hot and cold water pipes or ductwork. Outdoor Sensor – BAYSEN01ATEMPA – Location Careful consideration of the following recommendations will help the outdoor sensor provide continuous accurate readings:
Mounting and Wiring
SETUP
Enter INSTALLER Setup: (See Table 3, step 1 – 33 for option details)
When applying this Comfort Control in DUAL FUEL APPLICATIONS using a two-stage gas or oil furnace, select Single Stage Heat (a setting of 1) for Heater Stages in Step 8 of
Installer Setup and wire according to the external dual fuel kit instructions. See Table 3.
Enter USER Setup
(See Table 3, step 40-50 for option details) Press and hold Mode and Fan at the same time.
Note: Allow a minimum of 5 seconds after saving selections (Step 99 – SA) for the control to write selections to memory. If power is lost or removed prior to the 5 second elapsed
time, the selections may be lost and must be re-entered. If the SERVICE icon is flashing on the control LCD, press any key and check/re-enter setup choices.
Keypad Navigation
Use the Mode and Fan buttons to navigate forward and backward through the configuration and Manual Test Mode steps. Press Mode to advance forward to the next step. Press Fan to return to the previous step. Use the Up and Down arrow buttons to select or change setup options.
Lock – Unlock Keypad
Press and hold Up Arrow and Down Arrow at the same time. (“Keypad Locked” will display on LCD screen)
Defeat Equipment Time Delay
(Current Cycle only) Press Mode and Down Arrow at the same time.
There are two methods of verifying that the Comfort Control operates the system as intended.
Method 1: Normal Mode
This can be accomplished by pressing the appropriate keypad button(s) to cycle the system through each of the available modes and increasing or decreasing the setpoint to activate and deactivate the cycle. The minimum on and off cycle time delays, selected during the setup, will be enforced. Press the appropriate keypad button for the filter timer, outdoor temperature display and energy savings features to verify they are set to the end user’s desired preference.
Method 2: Manual Test Mode
The Comfort Control’s load outputs can be verified using the manual test mode. See Table 1 for navigating through the manual test mode steps.
To Enter The Manual Test Mode:
The Manual test mode will time out and return to normal operation after 1 minute from the last key press.
NOTE: The manual test mode allows the installer to energize the G fan relay , Table 1, Step 70, and then advance to Step 72 to energize the Y compressor output with the fan still operating. It is recommended that this method be used to prevent damage to the compressor.
Note: Press “$” Energy Savings key to exit manual test mode at any time – Step 70 78.
Table 2 | ||||||
T deg F | RESISTANCE (OHMS X 1000) 10K THERMISTOR | T deg F | RESISTANCE (OHMS X 1000) 10K THERMISTOR | T deg F | RESISTANCE (OHMS X 1000) 10K THERMISTOR | |
-15 | 138.9 | 35 | 30.0 | 80 | 9.3 | |
-10 | 117.7 | 40 | 26.1 | 85 | 8.3 | |
-5 | 99.9 | 45 | 22.7 | 90 | 7.3 | |
0 | 85.1 | 50 | 19.9 | 95 | 6.5 | |
5 | 72.7 | 55 | 17.4 | 100 | 5.8 | |
10 | 62.3 | 60 | 15.3 | 105 | 5.2 | |
15 | 53.5 | 65 | 13.5 | 110 | 4.7 | |
20 | 46.1 | 70 | 11.9 | 115 | 4.2 | |
25 | 39.8 | 75 | 10.5 | 120 | 3.8 | |
30 | 34.5 | |||||
4 | Pub. No. 18-HD29D2-4 |
Control Setup
Error Count | 0 | None | 1 | Temperature Display | 0 | 0 = Fahrenheit 1 = Celsius | 40 | |
Software Version | None | 2 | Auto or Manual Changeover | 1 | 0 = Manual 1 = Auto | 41 | ||
Configuration Signature – LoByte | None | 3 | Setpoint Deadband | 3 | 2 – 10 Degrees Fahrenheit 1.5 – 5.0 Degrees Celsius | 42 | ||
Configuration Signature – HiByte | None | 4 | Waiting Icon | 1 | 0 = Disable 1 = Enable | 43 | ||
System Type | 1 | 1 = AC 2 = HP | 5 | |||||
Compressor Stages | 1 | 0 = None 1 = Single Stage | 6 | Cooling Droop | 1 | 0 = Off 1 = 1 Degree 2 = 2 Degrees | 44 | |
Indoor Heater Type | 1 | 1 = Gas, Oil 2 = Electric | 7 | Energy Savings – Cooling Setpoint Offset | 5 | 0 – 25 Degrees Fahrenheit 0 – 15 Degrees Celsius | 45 | |
Indoor Heater Stages | 2 | 0 = None 1 = Single Stage Heater 2 = Two Stage Heater | 8 | Energy Savings – Heating Setpoint Offset | 5 | 0 – 45 Degrees Fahrenheit 0 – 25 Degrees Celsius | 46 | |
Outdoor Sensor | 0 | 0 = None 1 = Has Sensor | 9 | |||||
Cooling Cycle Fan ON Delay | 0 | 0 – 30 Seconds | 15 | Indoor Filter Timer Method | 0 | 0 = Calendar Days 1 = Fan Run Time Days | 47 | |
Cooling Cycle Fan OFF Delay | 0 | 0 – 90 Seconds | 16 | Indoor Filter Reminder – Days | 30 | 1 – 180 Days 0 = Disable | 48 | |
Compressor Heating Fan ON Delay | 0 | 0 – 30 Seconds | 17 | |||||
Compressor Heating Fan OFF Delay | 0 | 0 – 90 Seconds | 18 | Calibrate Indoor Temperature | 0 | Calibrated Room Temperature + / – 5 Degrees (1/2 degree increments) | 49 | |
Compressor Cooling Cycles Per Hour | 3 | 2 – 6 Cycles per Hour | 19 | Calibrate Outdoor Temperature (Enabled in step 9) | 0 | Calibrated Outdoor Temperature + / – 5 Degrees (1/2 degree increments) | 50 | |
Compressor Cooling Cycle Minimum On Time – Minutes | 3 | 2 – 4 CPH: 1 – 15 Minutes 5 CPH: 1 – 7 Minutes 6 CPH: 1 – 5 Minutes | 20 | Exit User Setup (Press Mode) | SA | CA = Cancel SA = Save US = Default User Settings | 99 (Exit) |
Note: Pressing the Energy Savings Key ($) anytime during setup will advance to
step 99.
Cycle Rate
The selected number of system cycles per hour. If the cycle rate were set to 3, each cycle would be 20 minutes long. The total ON and/or OFF times depends on actual indoor space load. A shorter cycle rate (more cycles per hour) may be desired for Heating in order to maintain a tighter control on indoor setpoint. A longer cycle rate may be desirable for Cooling so the system has the opportunity to remove moisture from the air and improve indoor comfort.
Auto Changeover
When the system mode is set to AUTO, the control automatically switches between heating and cooling modes to maintain the desired comfort level.
Setpoint Dead band
The number of degrees separating Heating and Cooling setpoints. The amount of separation between mode setpoints is user defined between 2 and 10 degrees. When the control is set to AUTO, and the cooling setpoint is changed to a cooler setting, the heating setpoint also changes to maintain the selected degrees separation. The same action occurs when the heating setpoint is changed to a warmer temperature.
Backlit Display & Keys
The liquid crystal display and the keypad will illuminate whenever a keypad button is pressed to improve control visibility. The back light stays on for 10 seconds after the last key press.
Cooling Droop
Cooling Droop is an automatic function that cycles the compressor on to improve indoor comfort by removing moisture from the air. The Droop cycle is activated when temperature is at or below the cooling temperature setpoint. When this function is active, the control will control temperature at 1 or 2 degrees below cooling setpoint. The Droop cycle is deactivated when the tempera- ture rises above the cooling setpoint.
Energy Savings
The Energy Savings mode provides energy savings by offsetting the indoor setpoint to a cooler temperature setting for heating and a warmer temperature setting for cooling.The Energy Savings mode is activated by pressing the Energy Savings key “$” on the control’s keypad. Pressing the Energy Savings key “$” again deactivates the Energy Savings mode. Pressing and holding the Energy Savings key “$” provides quick access to the setpoint offset for both heating and cooling.
Filter Reminder
“FILTER” will automatically flash to remind the home- owner that it is time to change the filter once the preset time has expired. Pressing the “Filter/OD” keypad button resets the internal clock timer. Once the timer has been reset, the number of days remaining until the next filter change can easily be determined by simply pressing the “Filter/OD” keypad button once more. Pressing and holding the “Filter/OD” keypad button provides quick access to the filter timer value.
Keypad Lock
Locking the control’s keypad can help prevent unwanted tampering or changing the thermostat settings by pressing the controls UP and DOWN arrow keypad buttons at the same time and holding for 2 seconds. “Keypad Locked” will be displayed on the LCD. Repeating this combination unlocks the keypad and the “Keypad Locked” will disap- pear.
Business Card Drawer
The drawer attached to the mounting base of the control is designed to provide a convenient location for the home owner to locate their local servicer. A standard business card can be folded and inserted into the slot on the drawer to remind the User whom to call when service is required.
LitePort
LitePort is a patented feature that allows the servicer access to extended real-time and history data events stored in the Comfort Controls memory.
Manual Test Mode
The built in Manual Test Mode allows the servicer to quickly and easily test the control’s individual control outputs and makes diagnostic procedures a snap. Set the Mode to OFF, set the Fan to AUTO, and press the MODE and DOWN arrow keypad buttons at the same time and hold for 2 seconds. See Table 1, steps 70-78 for details.
Default Factory Settings
The thermostat is shipped with a set of factory default settings. The factory default settings can be restored at any time using the control configuration menu. (See Table 3, step 99).
Service Indicator
The “SERVICE” indicator automatically flashes when an internal fault or error has been detected by the Comfort Control.
Minimum Off Time Delay Override
Minimum Off time delays can be overridden for the current cycle by pressing the Mode and Down arrow keys at the same time for approximately 2 seconds. It may be neces- sary to lower the indoor setpoint for cooling or increase the setpoint for heating to activate the system. Minimum off time delays will be enforced on the next cycle.
Wait Indicator
“Waiting” will illuminate when the indoor setpoint is moved in the direction of calling for additional system capacity. “Waiting” indicates system time delays are being enforced and that the control is adjusting to the new settings.
Calibrate Indoor Temperature
This option allows calibration of the room temperature sensor. The selected number is number of degrees, plus or minus, which will be added to actual temperature. The number can range between + 5 and – 5 degrees in 1/2 degree increments. Factory default is 0. This adjusted value will be used as actual temperature for both display and control action. For example, if 2 is selected, 72 degrees actual will read 74 degrees.
This option allows calibration of the outdoor temperature sensor. The selected number is number of degrees, plus or minus, which will be added to actual temperature. The number can range between + 5 and – 5 degrees in 1/2 degree increments. Factory default is 0. This adjusted value will b used and displayed as actual temperature. For example, if 2 is selected, 72 degrees actual will read 74 degrees. Outdoor Temperature Sensor With the outdoor sensor installed and enabled, outdoor temperature can be displayed on the Comfort Controls display by simply pressing the Filter/OD button. Control Response Rate A set of higher gain Proportional-Integral control constants can be chosen to increase the responsiveness of the temperature
control performance.
American Standard Inc.
6200 Troup Highway
Tyler, TX 75707
For more information contact your local dealer (distributor) Since the manufacturer has a policy of continuous product and product data improvement, it reserves the right to change design and specifications without notice.
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