Trane THT02774 Thermostat Operation Manual

The Trane THT02774 (BAYSTAT150A) is a programmable push-button thermostat for commercial conventional and heat pump systems. It features an intuitive LCD display, soft-touch buttons, support for 3-stage heat/2-stage cool, scheduling options (5/2, 5/1/1, 7-day), temporary overrides, lockout features, and compatibility with remote 10K type 2 sensors. It supports system modes (Heat/Cool/Auto/Off/Em Heat) and fan modes (On/Auto). Below are the key specifications and operation instructions.

Key Specifications

• Type: Programmable push-button thermostat, 3H/2C stages
• Compatibility:
  • Conventional (rooftop) air conditioners and heat pumps with/without auxiliary heat
  • Remote sensor: 10K type 2 (e.g., BAYSENS077A, BAYSTAT170A)
• Power:
  • Input: 24 Vac, 50/60 Hz (18-32 Vac)
  • Consumption: <1 VA
  • Wire: 18-22 AWG
  • Output: 1A resistive @ 30 Vac
• Temperature Range:
  • Operating: 32°F to 122°F (0°C to 50°C)
  • Storage: -40°F to 185°F (-40°C to 85°C)
  • Heat Setpoint: 40°F to 90°F (4.5°C to 32°C)
  • Cool Setpoint: 50°F to 99°F (10°C to 37°C)
  • Display: +15°F to +122°F (-9.5°C to +50°C)
• Operating Conditions: 5% to 95% RH non-condensing
• Dimensions: 4.7” x 3.3” x 1.1” (119 x 83 x 28 mm)
• Features:
  • LCD display; Soft-touch buttons
  • Scheduling: 5/2, 5/1/1, 7-day; 2/4 periods
  • Temporary override (TOV); Lockout options
  • System modes: Heat/Cool/Auto/Off/Em Heat; Fan: On/Auto
• Compliance: ENERGY STAR; UL 94-5VA; National/state/local codes

Operation Instructions

Initial Setup

1. Power On: Connect to 24 Vac; display shows current time, mode, setpoints.
2. Set Time: From home screen, press buttons to access time; adjust hours/minutes with up/down; save and exit.
3. Set System Mode: Press mode button; select Heat/Cool/Auto/Off/Em Heat; save.
4. Configure Schedule: See Settings for programming.

Home Screen Navigation

1. Display: Current time, system/fan mode, setpoints; hourglass for TOV.
2. Controls: Up/down arrows for adjustments; mode/fan buttons for selection.
3. Indicators: Flashing for editable fields; solid hourglass in TOV.

Operating Modes

1. Heat: Select Heat; adjust setpoint up; activates stages.
2. Cool: Select Cool; adjust setpoint down; activates stages.
3. Auto: Automatic heat/cool changeover.
4. Off: No operation.
5. Em Heat: Emergency heat for heat pumps.
6. Fan: On (continuous) or Auto (with system).

Settings Screen

1. Timed Override (TOV): Press override buttons; adjust setpoints/fan/occupancy/hours (up to 99 days); save; reverts after time.
2. Schedule Editing: Access schedule; select days/periods; set time/heat/cool/fan; save for each.
3. Lockout: Installer-configured; restricts system/fan/schedule changes.
4. Reset: Power cycle; hold cancel for TOV exit.

Advanced Features

1. Scheduling: 5/2, 5/1/1, 7-day; 2 or 4 periods (e.g., Morning/Day/Evening/Night).
2. Remote Sensor: For display/control/lockout; 10K type 2.
3. TOV: Temporary changes to schedule; includes occupancy if enabled.
4. Default Schedules: ENERGY STAR compliant (e.g., Heat 70°F day, 62°F night).

Troubleshooting

• Display Blank: Check 24 Vac power; verify R-C wiring.
  
• No Heat/Cool: Confirm mode/setpoint; check stages, fan; test override.
  
• TOV Not Working: Ensure programmable mode; check lockouts.
  
• Schedule Issues: Re-edit periods; verify day selection.
  
• Sensor Errors: Confirm 10K type 2 compatibility; check connections.
  
• Persistent: Consult qualified service.

Installation Instructions

Warning: Qualified personnel only. Disconnect power. Observe safety precautions.

Pre-Installation

• Location: 5 ft above floor, good circulation; avoid drafts/sun/heat.
  
• Tools: Screwdriver, level, wire strippers.
  
• Mounting: Fits 2x4 junction box (vertical).

Wiring Diagrams

Terminal Designations:

Terminal	Description
R	24 Vac Heating
Rc	24 Vac Cooling
W1	Heat Relay 1
W2	Heat Relay 2/Aux/Emergency
G	Fan Relay
Y	Compressor 1
Y2	Compressor 2
O/B	Reversing Valve (Heat Pump)
A	Economizer Relay
C	Common
S1/S2	Remote Sensor

Notes: Jump R-Rc if single transformer. Heat pump terminals in parentheses. 18-22 AWG wire.

Configuration Options

1. Mount to junction box; connect wires per diagram.
   
2. Set installer options (e.g., scheduling type, lockouts).
   
3. Power up; run initial time/system setup.
   
4. Test modes: Verify heat/cool stages, fan, sensor if used.
   
5. Program schedule.

Calculation Tool

Estimate monthly energy savings from programmable scheduling (assumes 8°F setback saving 0.2 kWh per hour unoccupied; 30 days/month).