Xiamen Smarttek PCT503-W, Быстрый старт

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6.2. Thermostat Installation
Step 1: Turn power off
This protects yourself and your equipment. Turn off the power at
the breaker box or switch that controls your heating/cooling system.
And please check that your system is off.
Breaker box Switch
Step 2: Remove the old thermostat’s cover
Some covers pop off, while others need to be unscrewed
Step 3: Check your system
CAUTION : Do not connect PCT503 thermostat to high
voltage wires.
If your old thermostat is labeled 120V or 240V or has thick wires
with wire nuts, your system is high voltage. If you are not sure,
please contact support.