Bryant T1-NAC Non-Programmable Thermostat Installation Instruction

Bryant T1-NAC Non-Programmable Thermostat

Installation Instructions

NOTE: Read the entire instruction manual before starting the installation.

SAFETY CONSIDERATIONS
Read and follow manufacturer instructions carefully. Follow all local electrical codes during installation. All wiring must conform to local and national electrical codes. Improper wiring or installation may damage thermostat.
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 may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

INTRODUCTION

The Legacy Line–RNC Series thermostat is an electronic 24VAC, non–programmable, manual changeover wall mount thermostat. This thermostat uses a single setpoint to maintain and control room temperature in both the heating and air conditioning modes. The thermostat is designed to maintain +/– 2_F accuracy. No batteries are required; temperature, fan, mode, and installer configuration settings are preserved with power off.

INSTALLATION CONSIDERATIONS

Air Conditioner Model
T1–NAC, Legacy Line–RNC Series Model air conditioner thermostat, may be wired with or without connecting a common wire between the indoor equipment and the thermostat. However, it is recommended to use a common wire whenever possible. Without a common wire this thermostat becomes “power stealing.” This means it will need to steal a small amount of power from the equipment to which it is connected.
NOTE: Not all HVAC equipment is compatible with power stealing type thermostats. All Bryant equipment is directly compatible with this thermostat except the Thermostat Conversion Kit, Part #TSTATXXCNV10. For all non–Bryant equipment, consult the system equipment Installation Instructions before applying this thermostat in a power stealing manner.

Heat Pump Model
T1–NHP, Legacy Line–RNC Series Model heat pump thermostat, is compatible with all Bryant heat pump systems. It is NOT power stealing and MUST have both the R and C terminals connected to operate properly. This thermostat uses a green LED to indicate auxiliary heat and emergency heat operation.

INSTALLATION

Step 1 — Thermostat Location

Thermostat should be mounted:

• Approximately 5 ft (1.5m) from floor.
• Close to or in a frequently used room, preferably on an inside partitioning wall.
• On a section of wall without pipes or duct work.

Thermostat should NOT be mounted:

• Close to a window, on an outside wall, or next to a door leading to the outside.
• Exposed to direct light and heat from the sun, a lamp, fireplace, or other heat–radiating object which may cause a false reading.
• Close to or in direct airflow from supply registers and return–air grilles.
• In areas with poor air circulation, such as behind a door or in an alcove.

Step 2 — Install Thermostat

WARNING ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing thermostat, turn off all power to unit. There may be more than 1 disconnect.

1. Turn OFF all power to unit.
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 wall.
   • As each wire is disconnected, record wire color and terminal marking.
   • ]Discard or recycle old thermostat.
     CAUTION ENVIRONMENTAL HAZARD
     Failure to follow this caution may result in environmental damage.
     Mercury is a hazardous waste. Federal regulations require that Mercury be disposed of properly.
3. Separate front and back (mounting base) assembly of thermostat.
4. Route thermostat wires through hole in mounting base. Level mounting base against wall (for aesthetic value only, thermostat need not be level for proper operation) and mark wall through 2 mounting holes.
5. Drill two 3/16–in. mounting holes in wall where marked.
6. Secure mounting base to wall with 2 anchors and screws provided making sure all wires extend through hole in plastic.
7. Strip 1/4 in. insulation from thermostat wire and adjust length to reach terminal block connector on mounting base. Match and connect proper wiring in accordance with wiring diagrams.
8. Push any excess wire back into wall. Seal hole in wall to prevent air leaks. Leaks can affect thermostat operation. Any excess wire left inside thermostat casing may also affect thermostat operation by interfering with airflow across the temperature sensor.
9. Snap thermostat together making sure terminal block connector aligns, and assembly is secure.
10. Turn on power to unit.

On power up, depending on the thermostat model being used, the LCD readout will display either, AC or PC for air conditioner model (1–stage heat/1–stage cool), or HP or PH for heat pump model (2–stage heat/1–stage cool).

Step 3 — Set Thermostat Configuration

Configuration options allow the installer to configure the thermostat for a particular installation. These selections are intended to be made at installation and normally are not modified by the homeowner. Below is a list of available options followed by a description of each one.

• Option 01 — Equipment Type
• Option 03 — Fahrenheit or Centigrade operation
• Option 04 — Enable fan (G) ON with heat (W)
• Option 10 — O (reversing valve) On with Heat or Cool (present on Heat Pump model only)
• Option 13 — Room temperature offset adjustment
• Note that not all configuration option numbers are used in this product.

To Enter The Configuration Mode:
Press and hold FAN button for approximately 10 sec until room temperature disappears and the display reads “01”. You are now in configuration mode.
NOTE: If FAN button is pressed again, or if no button is pressed for 3 minutes, the thermostat will exit configuration mode and return to normal operation. To re–enter configuration mode, the FAN button must be pressed and held for 10 sec again.
While in the configuration mode, the temperature display is used to show both the option number and the selected choice within each option. Each press of the H/C button alternates between the option number and the selection within that option. When the configuration mode is first entered, option 01 is displayed. The up and down buttons now move between the available option numbers. Once an option number is selected, press the H/C button once to display the currently selected choice within that option. The up and down buttons now move between the available choices within that option. After the new choice is made, press the H/C button again to return to the option number display. When finished with option selections, press FAN button once to exit the configuration mode.

Option 01 — Equipment Type

Selections: with HP thermostat: HP, AC, PH, or PC with AC thermostat: AC or PC
Meanings: PH or PC selects PTAC units (Packaged Terminal Air Conditioners) that are used in motel rooms and other rented spaces. When this option is selected, the display shows only the setpoint, not the room temperature. Also, the compressor time guard is disabled, allowing the compressor to turn on immediately when demand is established.

HP or PH controls 1-speed heat pump with 1 stage of aux heat.
AC or PC controls 1-speed air conditioner with one stage of heat.
Note that this option allows an HP thermostat to be converted to control an AC system.

Option 03 — Fahrenheit/Centigrade Selection

This selection operates the thermostat in either Fahrenheit or Centigrade. Factory default is F.
Available Selection:
Use UP and DOWN buttons to change between F and C.

Option 04 — G (fan) ON with W (Heat) Selection

This selection determines whether G (fan) output is to be ON or OFF when W (furnace or strip heat) output is ON. Most furnaces and fan coils manage their own blowers and do not require a separate G signal. For these applications, select OFF. Some auxiliary heaters require a separate G signal from the thermostat to turn on the blower. In this case, select ON. Factory default is OF (off).

Available Selection:
Use UP and DOWN buttons to change between ON and OFF.

Option 10 — O (reversing valve) On with Heat or Cool Selection

This selection is only available on heat pump model thermostats. This selection determines whether the reversing valve is energized in the heating or cooling mode. Factory default is C.

Available Selection
Use UP and DOWN buttons to change between H and C.

Option 13 — Room Temperature Offset Adjustment
This option allows calibration (or deliberate miscalibration) of the room temperature sensor. There are various reasons why homeowners may want to have displayed temperature adjusted to a higher or lower value. The selected number is the number of degrees, plus or minus, which will be added to the actual temperature. The numbers can range between –5 and +5. Factory default is 0.

Available Selection
Use UP and DOWN buttons to now move between –5 and +5 in increments of 1.

Step 4 — Thermostat Operation
Temperature Display
The thermostat will display room temperature until UP or DOWN button is pressed. The word SET appears when these buttons are  pressed and the current setpoint is displayed. If no buttons ar pressed for 5 sec, the display will change back to show room temperature.

Timeguard Timer
A 5–minute time guard is built into the thermostat immediately upon power up, and any time the compressor turns off. The compressor will not turn on until the time guard has expired. The time guard affects only compressor operation. Pressing UP and FAN buttons simultaneously will override the time guard for 1 cycle. With PH or PC selected under Option 01, this timer is defeated.

Cycle Timer
In normal heating and cooling operation, the thermostat will not allow more than 4 equipment cycles per hour (or 1 cycle every 15 minutes). Both the Y and W outputs have a 15-minute timer that starts counting down when the output is turned on, (e.g., if Y output is turned on for 9 minutes and then satisfies, it cannot turn back on for another 6 minutes regardless of demand). However, pressing UP and FAN buttons simultaneously or changing the setpoint will override the timer for 1 cycle.

Minimum on Timer
Once the equipment has turned on, it will remain on for a minimum of 3 minutes regardless of demand. However, the equipment can turn off in less than 3 minutes if a change in setpoint or a change in mode occurs.

Staging Timer

If the thermostat is a heat pump model, it has 2–stage heat capability. With HP operation, there is a 15-minute delay between the first and second stages of heat. The Y output will energize first, then 15 minutes later, and W is allowed to come on if the thermostat determines it is not satisfying the demand. However, if the heating demand is greater than 5_F, there will be only a 30-second delay before bringing on W.

Auxiliary Heat Indicator
A green LED indicates the use of auxiliary heat or emergency heat.

ErrorMessages
“—-” (two dashes) will be displayed if the thermostat cannot properly read room temperature. If “—-” appears, replace the thermostat. E4 will be displayed if the thermostat has an internal memory failure. If E4 appears, replace the thermostat.

Step 5 — Check Thermostat Operation
Fan Operation

1. Press the FAN button. This will start continuous fan operation. The FAN annunciator will turn on.
2. Press FAN button again. This will stop continuous fan operation. FAN annunciator will turn off.

Heating Operation

1. Press H/C button until HEAT is displayed.
2. Press UP button until LCD readout reads 3_F above room temperature. Press UP and FAN buttons simultaneously to defeat timers. The heating system should begin to operate immediately.
3. For HP thermostats only, press H/C button until EMHT (emergency heat) appears. Press UP and FAN buttons simultaneously to defeat timers. Emergency heating (W is ON, Y is OFF) should begin immediately.

Cooling Operation

1. Press H/C button until COOL is displayed.
2. Press DOWN button until LCD readout reads 3_F below room temperature. Press UP and FAN buttons simultaneously to defeat timers. The cooling system should begin to operate immediately. Table 1 shows the thermostat outputs for each available stage of heating or cooling. It may be useful in the checkout or troubleshooting

Table 1 – Outputs

EQUIPMENT CONFIGURATION OPTION #1	THERMOSTAT FACTORY CONFIGURATION	COOL STAGE 1	HEAT STAGE 1	HEAT STAGE 2	EM HEAT
AC, PC	AC, HP	Y, G	W	— —	— —
HP, PH RVS = C	HP	Y, G, O/B	Y, G	Y, G, W	W
HP, PH RVS = H	HP	Y, G	Y, G, O/B	Y, G, W, O/B	W

WIRING DIAGRAMS

REFERENCE:

Download Manual:

Bryant T1-NAC Non-Programmable Thermostat Installation Instruction

OTHER MANUALS:

Bryant T1-NAC Non-Programmable Thermostat Homeowner’s Guide

Bryant T1-NAC Non-Programmable Thermostat Installation Instruction