Trane XR401 Thermostat Installation Guide

Trane XR401 Thermostat

Introduction

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.

• Requires external relay for oil furnace applications.
• External TAYPLUS103A required for dual fuel applications.
• BAYSEN01ATEMPA required for outdoor temperature sensing and display
• SYSTEM MODE: Heat, Cool, Auto, Emergency Heat and Off FAN MODE: Auto or On

Product Specifications

• Power Source: 20-30VAC, Class II, 50/60Hz.
• Cooling setpoint temperature range: 65F – 90F, 18.0C – 33.0C, 1F and 0.5C resolution.
• Heating setpoint temperature range: 40F- 85F, 5.0C – 30.0C, 1F and 0.5C resolution.
• Default set points: 68F, 20.0C Heat, 78F, 25.5C Cool
• Storage Range: -40F to 140F, 5% – 90% RH non-condensing.
• Operating Temperature range: 32F – 110F, 5 – 90% RH non-condensing.
• Outdoor Temperature Display Range: -40F – 140F.
• Minimum Cycle Off Time Delay: Cooling – 5 minutes, Heating – 1 minute.
• Use minimum 18 gauge NEC approved control wiring.

CAUTION
To prevent shortening its service life, the control should not be installed until construction is completed.

Installation

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, sun light, 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 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:

1. Mount the outdoor sensor on the north facing side of the building in an area where it is exposed to freely circulat-ing airflow and out of direct sunlight.
2. Do not allow hot air airflow from the attic or drafts from inside exterior walls to bias the sensors operation. Always seal the hole where control wiring passes to the outside of the structure. Use non-hardening caulk, putty, or insulation.
3. Avoid locations such as near dryer vents or placing the sensor close to, or directly above the outdoor unit where it would be exposed to hot discharge air from the con-denser fan.
   Maximum length of field wiring cable to sensor is 200 feet.
4. . Minimum wire gauge is 18AWG.

Mounting and Wiring

1. Turn OFF all power to heating and cooling equipment.
2. If an existing thermostat is being replaced:
   • Remove existing thermostat from wall.
   • Disconnect wires from existing thermostat, one at a time. Be careful not to allow wires to fall back into the wall.
   • As each wire is disconnected, record wire color and terminal marking.
   • Discard or recycle old thermostat. Mercury is a hazardous waste and MUST be managed properly. If the Comfort Control is replacing a thermostat that contains mercury in a sealed tube, do not place your old thermostat in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old thermostat.
3. Separate the control from the mounting base to expose mounting holes by pressing the release button A on the bottom of the control with the thumb of one hand while T gripping the subbase by the mounting holes with the other hand. Lift out and up. See Figure 1.
4. Slide the mounting base drawer out to expose all the mounting holes. Route control wires through the large hole in mounting base. Level mounting base against wall (for aesthetic value only) and mark wall through 2 mounting holes. See Figure 2.
5. Drill two mounting holes in wall where marked.
6. Secure mounting base to wall with 2 screws (use anchors provided if needed). Additional mounting holes are available for more secure mounting if needed. Make sure all wires (including the 2 outdoor sensor wires) extend through hole in mounting base.
7. Adjust length and routing of each wire to reach proper terminal on the connector block on mounting base. Strip only 1/4-in. of insulation from each wire to prevent adjacent wires from shorting together when connected.
8. Match and connect control wires to proper terminals on the connector block. (See figures 3, 4 & 5).
9. Push any excess wire back into the wall and seal the hole to prevent air leaks.
   Note: Air leaks in the wall behind the control can cause improper operation.
10. Check the operation of the business card drawer. Verify that it slides in and out without binding.
11. Reinstall the control on its mounting base by aligning the control at the top of the mounting base. Swing the control downward and gently press the bottom of control into position until latch button A engages. See Figure 1.
12.  Turn ON power to the heating and cooling equipment.

SETUP
Enter INSTALLER Setup: (See Table 3, step 1 – 33 for option details)

1.  Set System Mode to OFF
2.  Set Fan to AUTO
3.  Press and hold Mode and Up Arrow at the same time.
4. SET-UP will appear on display. See Figure 6.

When applying this Comfort Control in DUAL FUEL APPLI-CATIONS 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 reentered. 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.

Checkout

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:

1. Set System Mode to OFF
2. Set Fan to AUTO
3. Press and hold Mode and Down Arrow at the same time.

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 ener-gize 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.

• Step 99 – Make setting selection and then press MODE to exit.
• CAncel = Cancel Selections for current session and return to previous session selections.
• SAve = Save selections
• USer = Default user settings
• Steps 15 & 17: Do not select a Comfort Control on-delay if the Comfort-R airflow profile is selected for a variable speed indoor unit.
• Steps 16 & 18: Do not select a Comfort Control blower off-delay unless the indoor unit blower off-delay has been disabled.
• Steps 27 – 30 not available when Step 8 is set to “0”.
• Steps 29 – 30 not available when Step 8 is set to “1”.
• Step 50 not available when Step 9 is set to “0”.
• Steps 17 – 18 & 23 – 24 not available when Step 5 is set to “1”.
• Step 6 cannot be changed when Step 5 is set to “2”.
• Steps 15 – 16, 19 – 20 & 41 – 42, 44 are not available when Step 6 is set to “0”.
• Steps 41 – 42 are not available when Step 8 is set to “0” & Step 5 is set to “1”. Changing Step 5 to “2” will change the default settings for Step 6, 7 and 8.
• Selecting 2 Heater stages with a heat pump affects only Emergency Heat operation since this control is 2H/1C only.

Features

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.

Calibrate Outdoor Temperature

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.

REFERENCE:

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Trane XR401 Thermostat Installation Guide

Trane XR401 Thermostat Installation Guide

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