-11- If the main air and signal connections are reversed the thermostat typically makes an air hissing noise. True False -12- If the main air and signal connections are reversed the thermostat will still control, but a little slower to react. True False -13- If a thermostat is controlling a normally open heating valve and a normally closed cooling valve with identical spring ranges, the temperature will control, but energy will be wasted. True False -14- An air leak on the branch of a relay thermostat can consume more compressed air than fifty extra thermostats working normally on the system. True False -15- The maximum volume of compressed air thermostats can pass out their branch lines varies based on different manufacturers. True False -16- In an existing system, another manufacturer’s thermostat may usually be used as long as the change-over point is adjusted to match the existing system and the thermostat is the same action. True False -17- When calibrating a day only thermostat you set the dial at the current room temperature and adjust the branch signal to midrange of the valve or damper being controlled. True False -18- The change-over point is not adjustable on summer/winter or day/night thermostats. True False -19- In one stage of calibrating a thermostat, you must set the branch pressure for midpoint of the controlled device and use your breath to heat the bi-metal, checking for proper operation. True False -20-When you heat the thermostat in question 19, the pressure will go lower with a direct acting thermostat. True False VALVES -1- Normally open valves allow their maximum fluid flow when their diaphragm pressure is below the bottom end of the spring range. True False -2- The bench stroking spring range of a valve is the pressure difference between the pressure required to start the stroking of the valve and the pressure when the valve is fully driven. True False 1.2
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