The ZEN Thermostat is only compatible with low voltage systems, rated to 24VAC. The ZEN Thermostat will not work as a replacement for mains voltage thermostats which are typically 110-240VAC. If you are unsure about your type of system or suspect that it may be rated at 110 volts or higher, do not attempt to install your ZEN Thermostat. Contact a HVAC professional to assist with your installation.
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