Johnson Controls GLAS - Terminal Descriptions; Thermostat Terminal Functions

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IMPORTANT: If your thermostat is built into the wall and connected to
thick wires with wire nuts, or if it is labeled 110, 120, or 240 volts, you have
a high voltage system that is not compatible with the GLAS Thermostat.
Do not connect your thermostat to these high voltage wires. GLAS is only
compatible with 24 VAC systems.
GLAS smart thermostat installation instructions -
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