Spectra Watermakers: Troubleshooting Guide - Hybridenergy.com.au

(32) Vacuum SwitchThe vacuum sensor is found inside the feed pump module in the feed pump suction piping,downstream of the sea strainer and 50 micron filter. It is used for the CHK SEA STRAINERalarm to warn of a clogged strainer or 50 micron filter. It is set for 15 inches Hg. It has threeterminals: normally open, normally closed, and common.On systems with MPC controls the switch should be wired to normally open (NO) andCommon (C). When the switch closes the MPC controls shut the watermaker down and alarmCHK SEA STRAINER. If it is wired to (NC) you will get a false alarm. If you unplug thesensor the system should run normally. If you still get an alarm with the sensor unplugged thereis a problem in the printed circuit board.On Catalina Deluxe (non MPC) systems the switch is wired normally closed. If the switchopens the machine shuts off. If the switch fails the machine can be operated temporarily byjumping the leads together.36HOMEShurflo GuideVane Pump Guide Shurflo MPC Guide