Bryant T6-PHP, T6-PAC Troubleshooting, Error Codes, Relays, Temperature Offset After Power Cycle

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Relays

This thermostat uses latching relays. When the thermostat loses power, the relays will remain in their last position until power is restored and all relays are reset to their correct position. Out of the box, the outputs may appear to be On when the thermostat is not powered. This is normal. Output states should only be checked when the thermostat is powered.

Temperature Offset After Power Cycle

To compensate for internal heat build−up from the electronics in the thermostat, the thermostat will add an offset to the actual temperature that it measures. If the thermostat power is cycled quickly, one can witness an immediate increase in the actual temperature displayed due to this added offset. The thermostat display will return to the actual room temperature after several minutes of operation.

TROUBLESHOOTING

If the display module doesn’t power up after power is applied, check the Rc/Rh and C terminals for 24VAC. If 24VAC is present, check the voltage between Vg and V+. This voltage will be approximately 12−20VDC. If voltage is present, check the polarity to make sure it is wired correctly. The display will not power up if polarity is reversed.

If dashes appear for Option 01 in config and during reboot, the problem could be the red pigtail being wired to Rc or Rh and the black pigtail being wired to C. If so, remove the two−wire pigtail and connect to the V+ and Vg terminals.

Error Codes

“−−” − If AC/HP Control cannot properly read room temperature, display will indicate “−−” and all outputs (except fan, if on) will turn off. In the case where the installer has selected to average the local sensor and the remote room sensor, the AC/HP display will alternate between “−−” for the failed sensor and the

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Contents Installation Instructions Page Safety Considerations Table of ContentsIntroduction Power Installation ConsiderationsModels Outdoor Temperature SensorTwo−Piece Thermostat Configuration Remote Indoor Temperature SensorWiring InstallationAC/HP Control Location − T6−NAC / T6−NHP Carton ContentsElectrical Operation Hazard Install AC/HP ControlUnit Damage Hazard − Press Tabs to Remove Backplate Two−Piece Installation− Take Apart − Backplate Mounting Relays − Secure Wires to Terminal Strip − Attach Display to Backplate − Equipment Control Module on Equipment − Standoff − Cover on Equipment Control Module Single−Piece Installation − Equipment Control Module − Reattach Display Module Set AC/HP Control ConfigurationPage To Enter Configuration Mode Option 01 Equipment Type Configuration Options -SelectionOption 04 Fan G On With W/W1 Option 02 Clean Filter TimerOption 03 Fahrenheit/Centigrade Option 06 Cooling Lockout Below 55F − Remote Room Sensor − Parallel WiringOption 10 Reversing Valve Option 08 Auxiliary Heat Lockout TemperatureOption 07 Zoning Option 15 Enable Auto Mode Option 11 Deadband Setting Between Heat & CoolOption 12 Smart Recovery Option 13 Room Air Temperature Offset AdjustOption 17 Time Between Equipment Stages Option 18 Backlight ConfigurationOption 16 Maximum Cycles Per Hour Option 21 Keypad Lockout programmable models only Option 20 Outdoor Air Temperature Offset AdjustmentOption 21 Keypad Lockout non−programmable models only Page Option 26 Minimum Cooling Setpoint Option 24 Programmable/Non−ProgrammableOption 25 Number of Programmable Periods Option 30 Programmable Fan programmable models only Option 27 Maximum Heating SetpointOption 28 UV Light Reminder Page Option 44 Super Comfort Heat Option 33 Single or Two−Piece InstallationOption 41 Variable Speed Blower Option 99 Reset to Factory Defaults System START−UP and Checkout Energy Star Default Schedule Final SettingsPage Vacation programmable models only TimersOperational Information Defrost Cycle TimerTen−Minute Staging Timer Auto Changeover Equipment On IndicatorsHeat/Cool Setpoints Desired Temperature Three−Minute Minimum on TimeDry Contact Emergency Heat ModeProgrammable Fan programmable models only Relays TroubleshootingError Codes Temperature Offset After Power CyclePage Equipment Configuration Outputs − Equipment Configuration Outputs − Display to Equipment Control Module Connection Wiring DiagramsWiring DIAGRAMScont − Fan Coil shown with Auxiliary Connection #1 − Fan Coil with Air Conditioner Indicates connection may not be required/available − Furnace with Air Conditioner − Thermostat with Dry Contact Control for Run Time Outdoor Sensor Remote Room Air Conditioner − Single−stage Furnace with Air Conditioner and Split Power Mode Settings Thermostat Configuration RecordConfiguration Options Option Keypad Lockout Page Catalog No IIT6-PAC-03

T6-PAC, T6-NAC, T6-NHP, T6-PHP specifications

The Bryant T6 series is a line of advanced heating and cooling systems designed to offer exceptional comfort, energy efficiency, and cutting-edge technology for residential and commercial applications. The series includes models such as T6-PHP, T6-NHP, T6-NAC, and T6-PAC, each tailored to meet specific heating, ventilation, and air conditioning (HVAC) needs.

The Bryant T6-PHP (Heat Pump) model stands out with its dual-fuel capability, providing both electric heat pump operation and backup gas heating. This versatility allows for optimal energy use depending on outdoor temperatures, ensuring lower utility bills and consistent comfort. It also features high-efficiency ratings, making it an environmentally friendly choice, while its variable-speed compressor allows for quiet operation and precise temperature control. The T6-PHP is equipped with smart technology that allows homeowners to monitor and adjust settings remotely through mobile applications.

Similarly, the T6-NHP (Natural Gas Heat Pump) variant is designed for regions where natural gas is readily available. This model combines the efficiency of heat pump technology with the reliability of natural gas heating. The T6-NHP features intelligent performance diagnostics that help to optimize operation and reduce maintenance costs, ensuring that the system runs smoothly throughout its lifespan.

The T6-NAC (Air Conditioner) model focuses on delivering exceptional cooling performance. With enhanced energy efficiency ratings, it utilizes environmentally friendly refrigerants and is designed to reduce electricity consumption while providing consistent indoor comfort. The T6-NAC features advanced airflow technology that allows for better distribution of cooled air, improving overall comfort levels in the home.

Lastly, the T6-PAC (Packaged Air Conditioner) is a self-contained system that combines cooling and heating in a single unit, making it ideal for homes with limited installation space. This all-in-one unit features a compact design while still delivering high efficiency and performance. With a programmable thermostat and integration with smart home technology, the T6-PAC ensures user-friendly operation and convenient control.

In summary, the Bryant T6 series leverages state-of-the-art technology, energy-efficient designs, and user-friendly features to provide superior HVAC solutions. Whether it's the versatile heating capabilities of the T6-PHP and T6-NHP or the efficient cooling of the T6-NAC and T6-PAC, these units are engineered to deliver unmatched comfort and reliability for today's homeowners.
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