Trane THT02775 Thermostat Operation Manual

The Trane THT02775 (BAYSTAT152A, X13511538-01) is a touch-screen programmable thermostat for conventional rooftop units, air conditioners, and heat pumps. It features an LCD touch screen, support for 1-3 stage heat/1-2 stage cool, scheduling (2/4 periods, up to 7-day), temporary overrides, dehumidification, economizer/TOD control, remote sensors, and lockout features. Below are the key specifications and operation instructions.

Key Specifications

• Type: Touch-screen programmable thermostat for 1-3H/1-2C conventional/heat pump systems
• Compatibility:
  • Conventional rooftop units, heat pumps with/without aux heat; economizer/TOD; remote temp/humidity sensors
  • Single/dual transformer systems; dehumidification
• Power:
  • 24 Vac (18-32 Vac), 50-60 Hz; <1 VA consumption
  • Wire: 18-22 AWG
  • Output: 1A resistive @ 30 Vac
• Temperature Range:
  • Operating: 32°F to 122°F (0°C to 50°C)
  • Storage: -4°F to 158°F (-20°C to 70°C)
  • Setpoints: Heat 40°F-90°F, Cool 50°F-99°F
  • Display: ±15°F to 122°F (±9.5°C to 50°C); 0.5°/1° resolution
• Operating Conditions: 5% to 95% RH non-condensing
• Dimensions: Compact wall-mount design (approx. 4.7” x 3.3” x 1.1”)
• Features:
  • LCD touch screen; 2/4-period scheduling (7-day groups); Temporary override (TOV)
  • Fan auto/on; Auto changeover; Dehumidification; Filter reminder; CPH (1-10 heat/1-5 cool)
  • Lockout; Compressor/aux lockout; Fan-on extension; Remote/outdoor display
• Compliance: National/state/local codes; Trane safety standards

Operation Instructions

Initial Setup

1. Power On: Apply 24 Vac; performs self-test, displays errors if any (e.g., E1 low voltage).
2. Set Time/Date: Touch clock icon; adjust hours/minutes/day/month/year; save.
3. Set Mode/Fan: Select system (off/heat/cool/auto) and fan (auto/on) from home screen.
4. Installer Config: Access menu for initial options (e.g., temp units, system type).

Home Screen Navigation

1. Display: Current temp, setpoints, time/day, mode icons, occupancy, filter/error alerts.
2. Controls: Touch arrows for setpoints; mode/fan boxes for selection; menu for settings.
3. Indicators: Flame/snowflake for active modes; blinking filter/error; hourglass for TOV.

Operating Modes

1. Heat: Select Heat; raise setpoint; activates stages with flame icon.
2. Cool: Select Cool; lower setpoint; activates stages with snowflake icon.
3. Auto: Automatic changeover (manual/auto via config).
4. Off: No operation.
5. Em Heat: For heat pumps; aux heat bypass.
6. Fan: Auto (with system) or On (continuous).

Settings Screen

1. Access Menu: Touch menu; select time/schedule/dehumidify.
2. Schedule: Set periods (2/4), day groups; adjust time/heat/cool/fan/occupancy per period.
3. Filter Reset: Hold arrows 3s.
4. Offsets: Adjust temp/humidity (±6°F/°C).
5. Lockout: Requires code (default 0000) for changes.

Advanced Features

1. TOV: Touch fan box; quick (up to 4 hrs) or configurable (0.5-8 hrs); shows remaining time.
2. Dehumidification: Enable via config; controls with remote sensor.
3. CPH/Lockouts: Cycles per hour (1-10); temp-based compressor/aux lockout (40-70°F).
4. Display Options: Local/remote/outdoor temp/humidity; fan-on extension (40s heat/90s cool).

Troubleshooting

• Errors: E1/E2 (voltage—check wiring); E3/E7 (EEPROM/sensor—cycle power); E4/E6 (sensor short/open—replace); E5 (clock—reset); E8 (RAM—factory reset).
  
• No Display: Verify 24 Vac R-C; power cycle.
  
• No Heat/Cool: Check mode/setpoint, stages, lockouts; run tests.
  
• Filter Alert: Reset by holding arrows.
  
• Out-of-Range: Blinking "--F"/"--C"—reposition sensor.
  
• Persistent: Factory reset (Option 0300); contact Trane service.

Installation Instructions

Warning: Qualified personnel only. Disconnect power. Follow lockout/tagout.

Pre-Installation

• Location: 4-5 ft above floor, interior wall; avoid sun/drafts/heat.
  
• Tools: Screwdriver, level, wire strippers.
  
• Wire: 18-22 AWG; max length per gauge (e.g., 150 ft 18 AWG all wires).

Wiring Diagrams

Terminal Designations:

Terminal	Description
R	24V Hot (Heating)
Rc	24V Hot (Cooling)
W1/W2	Heat Stages/Aux
Y1/Y2	Compressor Stages
G	Fan
O/B	Reversing Valve
E	Emergency Heat
DH	Dehumidify
S1/S2	Remote Temp Sensor
Hp/Hs	Humidity Sensor
C	Common

Notes: Jumper R-Rc for single transformer. Diagrams for 1-3H/1-2C conventional/heat pump; remote sensors (10kΩ NTC temp, 4-20mA humidity).

Configuration Options

1. Mount backplate; connect wires per system diagram.
   
2. Power up; access installer menu (hold screen or code).
   
3. Set options: System type (0130), scheduling (0140/0230), CPH (0160), lockouts (0180), dehum (0170).
   
4. Run tests (1-15) for outputs/stages.
   
5. Program schedule; factory reset if needed (0300).

Calculation Tool

Estimate monthly energy savings from 4-period scheduling (assumes 8°F setback saving 0.2 kWh per hour unoccupied; 30 days/month).