Marley T200 Qmark Electric Line Voltage Wall Thermostat Instruction Manual

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of the Marley T200 Qmark Electric Line Voltage Wall Thermostat. The T200 is a wall-mounted, double-pole, heating-only thermostat designed for precise control of electric heating systems. It features a built-in heat anticipator for consistent temperature regulation and a snap-action design for extended operational life. Please read this manual thoroughly before installation and use.

2. Safety Information

WARNING: Risk of electric shock. This device operates on line voltage (277 Volts). Improper installation or handling can result in serious injury or death. Always turn off power at the main service panel before installing or servicing this thermostat.

• Installation must be performed by a qualified electrician in accordance with all local and national electrical codes.
• Do not install in locations where it may be exposed to water or excessive humidity.
• Ensure all wiring connections are secure and properly insulated.
• Do not exceed the specified voltage or current ratings of the thermostat.

3. Package Contents

Verify that all components are present before beginning installation:

• Marley T200 Line Voltage Wall Thermostat
• Mounting Screws (typically included)
• Instruction Manual (this document)

4. Installation

The Marley T200 thermostat is designed for wall-mount installation. Ensure the power supply to the heating system is disconnected at the circuit breaker before proceeding.

4.1 Wiring

The T200 thermostat requires a 277 Volt power supply. It features three pre-stripped wires for connection:

• Connect the two red wires to the incoming 277V line voltage supply.
• Connect the black wire to the heating load (e.g., electric heater).
• Ensure all connections are made using appropriate wire nuts or connectors and are securely tightened.

Refer to the diagram below for visual guidance on the thermostat's wiring and components.

Figure 1: The Marley T200 thermostat showing its off-white rectangular body, a brass-colored temperature dial with markings from 50 to 90 degrees Fahrenheit and an 'OFF' position, and three exposed electrical wires (two red, one black) extending from the left side for connection to the line voltage and heating load. The 'MARLEY' brand name is visible at the bottom front.

4.2 Mounting

After wiring, carefully push the thermostat into the wall box. Secure the thermostat to the wall box using the provided mounting screws. Ensure the thermostat is flush with the wall surface.

5. Operating Instructions

The Marley T200 thermostat features a simple manual control dial for setting the desired temperature.

• Temperature Adjustment: Rotate the central dial clockwise to increase the desired temperature or counter-clockwise to decrease it. The temperature range is from 50°F to 90°F.
• OFF Position: To turn off the heating system, rotate the dial counter-clockwise until it reaches the 'OFF' position. This will completely disconnect power to the heating load.
• The built-in heat anticipator helps maintain a consistent room temperature by cycling the heating system more frequently for shorter durations, preventing wide temperature swings.

6. Maintenance

The Marley T200 thermostat requires minimal maintenance.

• Cleaning: Periodically wipe the exterior of the thermostat with a soft, dry cloth to remove dust. Do not use abrasive cleaners or solvents.
• No User-Serviceable Parts: There are no user-serviceable parts inside the thermostat. Do not attempt to open or repair the unit.

7. Troubleshooting

If you experience issues with your Marley T200 thermostat, consider the following:

• No Heat:
  • Check if the thermostat dial is set to the 'OFF' position.
  • Ensure the circuit breaker for the heating system is not tripped.
  • Verify that the thermostat is properly wired and all connections are secure (consult a qualified electrician if unsure).
• Inconsistent Temperature:
  • Ensure the thermostat is not located near heat sources (e.g., direct sunlight, lamps) or drafts, which can affect its accuracy.
  • The thermostat has a differential of 2.5 degrees, meaning it will cycle the heat within a 2.5-degree range of the set point.

For persistent issues, contact a qualified electrician or Marley customer support.

8. Specifications

9. Warranty and Support

Specific warranty information for the Marley T200 thermostat is not provided in this document. For details regarding warranty coverage, technical support, or replacement parts, please contact Marley customer service directly or refer to the official Marley website. Keep your purchase receipt as proof of purchase.