Expected Irrigation System’s Values:
input (approximately 112 volts AC) and the controller’s output at each terminal. The controller’s manufac(1) Whole System Expectations: ture’s specifications state that there “Whole system” malfunction factors should be 24 volts AC out of the typically represent a large portion of controller’s transformer and at each irrigation system issues. Therefore, terminal. you will first want to verify, inspect and repair any obvious and subtle (3) Circuit 1 Expectations: Circuit whole system issues. Those would 1 contains one valve that, according include: physical damage due to to manufacturer’s specifications, is impact/vandalism, rodents, and con- expected to give a multimeter readstruction/digging; ensure adequate ing of 30 ohm resistance and draw water volume & pressure- that the 0.9 amps when energized. water control valve is open; system Note: Sometimes you do not have leaks are not present, etc. Your time the luxury of having valve electrical spent verifying the whole system is performance information at-hand. time well spent. Therefore, if you don’t know (2) Controller Expectation’s: the expected resistance values, take Check for programming errors (a readings of several existing site major malfunctioning contributor) valves (or similar valves you may and inadequate installation “failhave with you) and use these readures” (especially poor wire conings as your “expected” resistance nects). Make note of any recent reading. storms and look for burnt/discolored wiring and circuit boards caused by Circuit 2 Expectations: This lightning surges or other electrical circuit contains three 30 ohm valves surges. Look for sensors that might that draw 0.9 amps (according to be affecting system operation- dis- manufacture specifications). The connect them and test separately if circuit’s wiring will create an ohm need be. Verify pump-start circuit. resistance of approximately 1.0 ohm Measure controller’s power supply per 1000 ft. For residential systems, Page 32