In the illustrated terminal reheat multiple zone system, what statement represents the functioning of the summer outside air duct thermostat? GS-RA-42 Illustration GS-RA-42: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option C — During the cooling season, the summer thermostat senses the outside air temperature and closes the exhaust and outside air dampers when the outside air temperature is significantly higher than typical indoor air temperatures.

Summer outside air thermostats monitor ambient thermal conditions during warm operating modes. When outdoor temperatures exceed typical interior space comfort limits, the controller closes outdoor and exhaust dampers to minimize cooling loads and maximize internal air recirculation.