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Installation precautions
• Before installing the Smart Thermostat HD or servicing
the HVAC equipment, turn off power to the system.
• Leave power off until you have finished installing or
servicing the HVAC equipment.
• Shorting the electric terminals at the control on the
heating or cooling system is not recommended.
Do not test the system this way.
• When testing the existing system or the new Smart
Thermostat HD do not run the cooling system when it
is cold outside as this may harm the compressor.
Please wait for mild temperatures before testing the
cooling system.
• You must follow all local codes and ordinances for
wiring the system.
• The Smart Thermostat HD should only be powered
by a listed Class 2 power supply at 24 VAC
(C-wire or wall transformer).
• A current higher than 1 amp to each thermostat
terminal may cause damage to the thermostat.
• Verify that the system is 24 VAC. If the old system is
labeled as 120 V or 240 V or has wire nuts, the system
is high voltage. Do NOT install this thermostat on a
high voltage system. Contact a local HVAC
professional for help.
Questions?
Visit answers.alarm.com
or contact your service provider.
