Which of the following is not a correct method of heat regulation?
a) Direct modulation of the control valve on the steam or hot water to the heating coil
b) Modulating the position of a 3-way mixing valve on the hot/cold water line into the coil
c) Modulating the relative positions of face and bypass dampers controlling air flow across the coils
d) Modulating the actuators or the steam or water supply in conjunction with the coil bypass damper
e) Modulating the valve and the face and the bypass damper 30 degrees out of phase.
Answer: E