For a glycol preheat system, using hot water as its heat source, which of the following statements is false?
a. The glycol in the system prevents the heat exchanger from freezing if the hot water circulating pump fails.
b. Flanges or unions and manual shutoff valves must be provided to facilitate removal of the heat exchanger coil
c. The temperature controller opens the hot water supply valve when the temperature outside drops to 10°C
d. A hot water flow switch prevents the glycol pump from starting until the hot water supply valve is established
e. Hot water temperature should not exceed 100°C
Answer: A