SAFETY LOOPS -1- Low limits (sometimes called freeze stats) have an averaging element and shut down the fan if the air is too cold. True False -2- High limits (sometimes called fire stats) should be only installed in the supply and mixed air. True False -3- Circuits sensing the coil water temperature with an electric thermostat (45°F) and the water electric flow switch wired in series, also have an outdoor temperature electric thermostat (45°F) wired in parallel with the series circuit previously mentioned. True False -4- Low and high limit circuits may be fully electric or pneumatic with a pressure switch. True False -5- Normally the safety circuit should be wired through the automatic side of the starter switch and not the hand side of the switch. True False -6- Static pressure high limit on VAV systems shut down the fan before the pressure reaches the system’s static control point. True False -7- If a low limit is causing nuisance fan shut downs, it is usually OK to jumper the contacts of the low limit to keep the fan running. True False -8- If the high pressure relief valve on the compressor keeps blowing off, you should remove it and plug the hole. True False -9- The pressure switch on the compressor can be jumpered, if defective, until you get a new one. True False -10- The steam valve on the heat exchanger for domestic hot water should fail closed. True False 1.7
RkJQdWJsaXNoZXIy ODY1ODQy