Honeywell CT230-GA Programmable Thermostat
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- Installation must be carried out by a certified electrician and must comply with national and local electrical codes.
- Use the CT230 linked unit for resistive load only.
- Do NOT install the CT230 linked unit in an area where it can be exposed to water or rain.
- To prevent severe shock or electrocution, always turn the power OFF at the service panel before working with wiring.
- Install the CT230 linked unit onto an electrical box.
- Connect the wires using solderless connectors for copper wires. Use special CO/ALR solderless connectors for connection to aluminum wires.
- Keep the top and bottom air vents (openings) of the CT230 clean and unobstructed at all times.
The CT230 linked unit is designed to be used in a system for large floor heating applications whose load is too high for a single conventional thermostat. The system consists of a master thermostat and multiple CT230 linked units (see diagram on the following page). The heating area is divided into zones of 15 A or less, each zone connected to a CT230-linked unit. The user sets the temperature and programs the heating schedule on the master thermostat.
- Each CT230 linked unit is powered by line voltage (120 VAC, 208 VAC or 240 VAC) and has its ground fault protection mechanism. Up to 10 CT230 linked units can be used in a given setup.
- The master thermostat (not included) can be a TH114 or TH115 thermostat operating on 12 VDC. The master thermostat is powered by one of the CT230 linked units.
- One (1) CT230 linked unit
- Two (2) mounting screws
- Four (4) solderless connectors for copper wires
Install each CT230 linked unit as follows:
- Turn the heating system off at the main electrical panel.
- Loosen the bottom screw and remove the CT230 faceplate from the wallplate. (The screw cannot be completely removed.)
- Connect the wallplate to the load (heating cables) and to the power supply (see wiring diagram on page 6).
NOTE: The CT230 linked units can operate on different voltages in the same setup (e.g., 5 units @ 120 V and 5 @ 240 V).
- Install the wallplate to the electrical box using the provided screws.
- If not already done, affix the provided terminal sticker to the wallplate.
- Insert the wires (not included) through one of the two openings on the wallplate and connect the CT230 linked units together in a daisy-chain configuration (see connection diagram on page 7).
- Reinstall the faceplate on the wall plate and tighten the screw.
- Access the ON/OFF switch by sliding the CT230 door upwards and placing the CT230 linked unit on OFF.
NOTE: Connect the wires using the provided solderless connectors for copper wires:
- The wire distance between the master thermostat and each CT230 unit must not exceed 500 ft. (150 m). 20-AWG wires are recommended.
- The floor sensor cable must not exceed 200 ft. (60 m).
Installing the master thermostat
WARNING: Make sure all CT230 linked units are Off.
- Connect the master thermostat to the nearest CT230 linked unit.
WARNING: Only one CT230 linked unit must be used to power the master thermostat.
- Connect the floor sensor (included with the TH114-AF-12VDC & TH115-AF-12VDC thermostat) to the master thermostat.
- Position the sensor cable such that it does not come in contact with the floor heating wires. The sensor must be centred between two floor heating wires for best temperature control.
- Do NOT staple the sensor head (the plastic end) to the floor. Doing so might damage the sensor. Any damage might not be noticeable during testing but can become apparent several days later.
- Loosen the bottom screw and remove the faceplate from the wallplate. (The screw cannot be completely removed.)
- Install the wallplate on the wall using the provided screws and wall anchors.
- Reinstall the faceplate on the wallplate.
- Apply power to the heating system and switch each CT230 linked unit and the master thermostat to On.
- Test the ground fault protection on each CT230 linked unit.
Ground fault protection (GFCI)
The CT230 linked unit, with built-in ground fault protection, is different from conventional thermostats. In the event of a ground fault, the ground fault protection mechanism on the CT230 linked unit will trip and quickly stop the flow of electricity to prevent serious injury.
Definition of a ground fault
Instead of following its normal safe path, electricity passes through a person’s body to reach the ground. For example, a defective floor heating mat can cause a ground fault. Ground fault protection, does not protect against circuit overloads, short circuits, or electrical shocks. For example, you can still receive an electrical shock if you touch bare wires while standing on a non-conducting surface such as a wood floor.
Ground fault protection reset
When the ground fault protection mechanism trips, the TEST light is On (red). To reset the ground fault protection, switch the CT230 linked unit to OFF and back to ON. The TEST light will turn off if the ground fault protection is functioning properly.
End of Life
If the TEST light is flashing permanently the device must be replaced.
Testing the ground fault protection
To ensure the ground fault protection on each CT230 linked unit is always in working order, test it after installation and every month there after.
- Increase the setpoint temperature on the master thermostat above the measured temperature in order to activate the heating system.
- Press the TEST button.
- If the TEST light does NOT turn On, the test has failed. Cut power to the heating system at the main electrical panel, have an electrician verify the installation and, if necessary, replace the CT230 linked unit.
- If the TEST light turns on, continue the test.
- Switch the CT230 linked unit to OFF then back to ON.
- If the TEST light turns off, the test has passed. Set the master thermostat back to the desired temperature. The test is now completed.
- If the TEST light remains on, the test has failed. Continue with the rest of the procedure.
- Switch the circuit breaker (at the service panel) of the heating system to off and then back to on.
- Repeat the test. If the test fails again, cut power to the heating system at the main electrical panel, have an electrician verify the installation and, if necessary, replace the CT230 linked unit.
|Max. load (resistive only)
Ground Fault Protection (GFCI)
|120 VAC, 60 Hz
4 wires, double pole
|240 VAC, 60 Hz
|120 VAC, 60 Hz
|240 VAC, 60 Hz
Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for three (3) years from the date of first purchase by the original purchaser. If at any time during the warranty period, the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it (at Resideo’s option).
If the product is defective,
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Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
33-00222EFS—04 M.S. Rev. 02-20 | Printed in United State
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