The rooftop heat pump unit connects to an electrical disconnect sized per the voltage schedule. A one-hundred-twenty-volt single-phase power supply feeds into the system, integrating smoke detector controls and relays for global shutdown capabilities. Low voltage control wiring interfaces between the rooftop unit, smoke detectors, and an electronic programmable room thermostat equipped with a four-hour adjustable override timer in thirty-minute increments. The mechanical contractor coordinates all wiring, power requirements, and smoke detector connections with the electrical and fire alarm contractors.
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