Honeywell Chronotherm T4600

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PRODUCT DATA

® U.S. Registered Trademark

T4600 Chronotherm

Electronic

Programmable Line Voltage Thermostat

APPLICATION

The T4600 Chronotherm® Electronic Programmable Line

Voltage Thermostat provides line voltage control of

resistance-rated heating equipment. The patented

CoolSwitch™ thyristor commutator design provides long

service life. Depending on local climate, night and day

setback of space temperature can save up to 23% of the

energy used to heat a controlled space. The precise

temperature control of the T4600 also provides 12% energy

savings during most comfort periods as compared to

electromechanical wall thermostats.

FEATURES

• Digital temperature sensing and control for energy-

efficient and precise (1.0°F) temperature control.

• Liquid crystal display shows temperature and load

status.

• Attractive contemporary styling.

•Temperature range selectable between 45°F to 80°F

(7°C to 27°C).

• Simple, pushbutton programming.

•Weekday-weekend (5-2) programming for permanent

home (normal) operation.

• Optional unoccupied low limit setting for seasonal

residence (cottage) operation.

•Temporary temperature override.

•Program override for seasonal temperature setback.

•Permanent override for seasonal shutdown.

• Rugged molded thermoplastic housing with captive

mounting screws.

• Suitable for electric heaters such as convectors,

radiant cable, and non-inductive-rated, fan-forced

heaters.

• Directly replaces two-wire, 240 Vac resistive-rated (up

to 10.4A of maximum 8 ft baseboard heater length) line

voltage thermostats.

•Patented, long-life electronic switch and power supply

with nonpolarized leadwire connections.

• Convenient 10-year program retention protects against

loss of program settings during seasonal setback

periods.

Contents

Application........................................................................... 1

Features .............................................................................. 1

Specifications ...................................................................... 2

Ordering Information ........................................................... 2

Installation ........................................................................... 3

Programming....................................................................... 5

Checkout ............................................................................. 7

68-0168-3

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The T4600 Chronotherm® Electronic Programmable Line Voltage Thermostat is a sophisticated control device designed for line voltage resistance-rated heating equipment. It offers precise and energy-efficient temperature management, capable of providing significant energy savings compared to traditional electromechanical thermostats.

Function Description

The T4600 Chronotherm® is an electronic programmable thermostat that controls line voltage heating systems. It utilizes digital temperature sensing and control to maintain a precise temperature within a controlled space. The thermostat features a patented CoolSwitch™ thyristor commutator design, which contributes to its long service life. It supports both permanent home (normal) operation with weekday-weekend (5-2) programming and an optional unoccupied low limit setting for seasonal residence (cottage) operation. Users can program specific temperature setbacks for night and day, with the potential to save up to 23% on heating energy. Additionally, its precise control offers 12% energy savings during most comfort periods compared to electromechanical wall thermostats. The device includes temporary and permanent override functions, allowing users to adjust the temperature setpoint as needed without disrupting the programmed schedule.

Important Technical Specifications

Control Type: Electronic programmable line voltage thermostat with SPST switching (makes heating circuit on temperature fall).
Sensing Element: Electronic thermistor with a time constant of ten seconds and patented digital sensing.
Temperature Control: Digital temperature sensing and control for energy-efficient and precise 1.0°F (0.4°C differential) temperature control.
Control Range: Selectable between 45°F to 80°F (7°C to 27°C) in 1°F increments; factory set at 60°F (16°C).
Operating Range: -22°F to 104°F (-30°C to +40°C).
Electrical Ratings (Non-inductive): 10.4A maximum, 3.1A minimum at 240V, 60 Hz (750 to 2500W). This supports a maximum of 8 ft of connected baseboard heater per thermostat.
Voltage: 240 Vac resistive-rated.
Switching: Patented CoolSwitch™ thyristor commutator with relay conductor.
Performance Precision: ±1°F temperature swing (±0.4°C differential) with electronic anticipation.
Accuracy: 2°F (1°C) maximum droop with 2500W load. Conforms to NEMA Standard DC3 for scale accuracy.
Programming: Menu-driven data entry with up (+) and down (-) keys for value selections and rapid slewing action. User-selectable temporary and permanent override modes. Time-of-Day format is selectable for 12-hour (AM/PM) or 24-hour. Temperature scale is selectable for °F or °C.
Display: Liquid Crystal Display (LCD) shows room temperature (35°F to 95°F / 2°C to 35°C) and load status. Setpoint temperature is displayed when up (+) or down (-) keys are pressed.
Battery Backup: Provides a minimum of 48 hours for Time-of-Day and an accumulated total of 80 weeks minimum for programs. Uses a 270 mA-h, 3 Vdc lithium button cell (included) with a 10-year normal life.
Wiring Connections: 6 in. (150 mm) stranded copper leads suitable for connecting to aluminum wiring when approved special service CO/ALR connectors are used.
Mounting: Directly mounts on vertical 2 in. x 3 in. flush-mount or 2 in. x 4 in. surface-mount junction box, or on 4 in. x 4 in. junction box with mud ring.
Approvals: Underwriters Laboratories Listed: E47434. Canadian Standards Association Certified: LR1322.
Dimensions: 3-1/8 in. (80 mm) wide, 4-3/4 in. (118 mm) high, 1-1/8 in. (29 mm) deep (from wall).

Usage Features

Digital Temperature Sensing and Control: Ensures precise temperature management for optimal comfort and energy efficiency.
Liquid Crystal Display (LCD): Provides clear visual feedback on current temperature and load status.
Contemporary Styling: Features an attractive design that blends with modern interiors.
Pushbutton Programming: Simplifies the process of setting schedules and preferences.
Weekday-Weekend (5-2) Programming: Allows for distinct heating schedules for weekdays and weekends, suitable for permanent home operation.
Optional Unoccupied Low Limit Setting: Ideal for seasonal residences (cottages), maintaining a minimum temperature (45°F / 7°C) to prevent freezing without continuous heating.
Temporary Temperature Override: Enables short-term adjustments to the setpoint without altering the programmed schedule.
Program Override for Seasonal Temperature Setback: Useful for extended periods when a lower temperature is desired.
Permanent Override for Seasonal Shutdown: Allows the thermostat to maintain a specific temperature indefinitely, useful for long periods of absence.
Suitable for Various Electric Heaters: Compatible with convectors, radiant cable, and non-inductive-rated, fan-forced heaters.
Direct Replacement: Can directly replace two-wire, 240 Vac resistive-rated line voltage thermostats.
Nonpolarized Leadwire Connections: Simplifies installation by eliminating concerns about leadwire polarity.
10-Year Program Retention: Ensures program settings are preserved even during seasonal setback periods or power outages, thanks to the long-life battery backup.

Maintenance Features

Rugged Molded Thermoplastic Housing: Provides durability and protection for internal components.
Captive Mounting Screws: Facilitates secure and straightforward installation.
Long-Life Electronic Switch and Power Supply: Contributes to the overall reliability and reduced maintenance needs of the device.
Battery Backup: The included 3 Vdc lithium button cell has a 10-year normal life, ensuring program retention and time-of-day accuracy during power interruptions. While the battery life is shortened if the T4600 is unpowered for long periods, its extended lifespan minimizes the frequency of battery replacement.
Easy Battery Installation: The battery cover on the thermostat back is designed for easy removal and insertion of the battery, with clear polarity indications.

The T4600 Chronotherm® is a robust and user-friendly thermostat designed to optimize energy consumption and provide consistent comfort for line voltage heating systems. Its advanced features, including precise digital control, flexible programming options, and long-life components, make it a reliable choice for both residential and seasonal applications.