Trane THS-02 Thermostat Operation Manual

The Trane THS-02 is a digital thermostat designed for heat pump systems with 2 compressors and auxiliary heating. It provides precise control and display of ambient temperature, system status, and optional outdoor temperature (with sensor). Features include battery-free operation for setting retention, keyboard lock, micro-switch configurations for timing (2/4 min minimum), and power cut recovery. It supports compressor control, fan, reversing valve, and forced auxiliary heating ("EHt" display). Below are the key specifications and operation instructions.

Key Specifications

• Type: Digital thermostat for heat pump with 2 compressors and auxiliary heating
• Compatibility:
  • Heat pump systems with auxiliary heating; optional outdoor temperature sensor
• Power:
  • 20-30 VAC or 24 VDC nominal; independent supply or mains via 24V transformer; no batteries
• Temperature Range:
  • Precise ambient temperature control (specific ranges not detailed)
• Operating Conditions: Indoor partition wall in occupied areas; avoid sunlight, drafts, heat sources
• Dimensions: Not specified
• Features:
  • Compressor control (1 and 2 stages); auxiliary heating; fan and reversing valve control
  • Keyboard lock; micro-switch settings for operation timing (2/4 min min.); outdoor temp display
  • Power cut recovery; LED indicators; symbols for keys and status
• Compliance: © American Standard Inc. 1999; manufactured by Société Trane, France

Operation Instructions

Initial Setup

1. Position Thermostat: Mount on indoor wall away from influences; no batteries required.
2. Power On: Connect to 24V supply; display activates with ambient temperature.
3. Configure Micro-Switches: Set for heat pump/auxiliary timing (see Settings).
4. Test Display: Verify ambient and optional outdoor temp.

Home Screen Navigation

1. Display: Ambient temperature and system status symbols; optional outdoor temp.
2. Controls: Press keys for mode selection, adjustments; symbols indicate functions.
3. Indicators: "EHt" for auxiliary heating (5 sec in forced mode); LEDs for status.

Operating Modes

1. Heating (Heat Pump): Activates compressors 1/2; reversing valve for mode.
2. Auxiliary Heating: Engages for forced heat ("EHt" display); compressor may cease.
3. Cooling: Compressors 1/2 with reversing valve.
4. Fan: On with system or continuous.
5. Off: Stops all operations.

Settings Screen

1. Micro-Switches: Access base for settings: heat pump normal/additional (compressor stop during aux), auxiliary 2/4 min min. operation, keyboard lock.
2. Outdoor Sensor: Connect for display; press key to view.
3. Reset: Power cycle for recovery; no manual reset detailed.

Advanced Features

1. Power Cut Recovery: Retains settings without battery; resumes on restore.
2. Forced Auxiliary: Activates independently; display "EHt".
3. Timing Controls: Micro-switches for min. operation (2/4 min) to optimize efficiency.
4. Sensor Integration: Optional outdoor temp for monitoring.

Troubleshooting

• Display Issues: Check power supply (20-30 VAC); verify connections.
  
• No Heat/Cool: Confirm micro-switch settings, reversing valve, compressor wiring.
  
• Auxiliary Not Engaging: Test forced mode; check timing (2/4 min).
  
• Temperature Inaccurate: Reposition away from drafts/sun/heat.
  
• Power Cuts: System recovers automatically; no data loss.
  
• Persistent Issues: Consult professional for wiring/sensor.

Installation Instructions

Warning: Professional installation. Disconnect power. Ensure precise positioning for accuracy.

Pre-Installation

• Location: Indoor partition wall in occupied area; avoid sunlight, drafts, doors, heat sources.
  
• Tools: Screwdriver for mounting/removal.
  
• Prep: No batteries; plan for 24V transformer if needed.

Wiring Diagrams

Supports heat pump with 2 compressors, auxiliary heating, fan, reversing valve. Use 20-30 VAC/24 VDC, 0.05-0.5A (peaks 1A).

Terminal	Description
Compressor 1	Cooling/heating output 1; 20-30 VAC/24 VDC, 0.05-0.5A
Compressor 2	Cooling/heating output 2; same specs
Auxiliary	Make-up/forced aux heating; same specs
Fan	Fan starting; supplied separately
Reversing Valve	Mode switching; supplied separately
24V(C)	Common
RS+V	Remote sensor/power (details limited)
LED1/LED2	Indicators
CLK1/CLK2	Clock functions

Notes: Independent or mains power via 24V transformer. Optional outdoor sensor wiring.

Configuration Options

1. Mount base on wall; connect wires per diagram.
   
2. Snap thermostat onto base.
   
3. Set micro-switches: Heat pump (normal/additional), auxiliary timing (2/4 min), keyboard (lock/unlock).
   
4. Connect optional outdoor sensor.
   
5. Test: Verify compressors, aux heat, fan, display.

Calculation Tool

Estimate monthly energy savings from 2/4 min operation timing (assumes 0.1 kWh saved per cycle with 4-min delay; 30 days/month).