The purpose of the "freeze-stat" temperature controller used with hot water coils is to
a) close the outside air dampers and stop the fan if the heat source fails or the low limit temperature controller malfunctions
b) increase the hot water flow through the coil if outside air temperature is too low
c) increase the heat source temperature if the outside air temperature decreases
d) open the outside air dampers wide when the outside air temperature rises
e) increase the fan output if the return air temperature is too low
Answer: A