Honeywell THP9045A1023 Wire Saver Module

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The THP9045 Wiring Module is designed to be used with applicable thermostats in which a 24V common is required and there are not enough wires. The K terminal on the thermostat can be used to operate both the fan and compressor on a single wire, and the module is designed to receive the signal from the K terminal, split that signal and re-route it to operate the compressor, and/or fan for normal operation.