Document MJG2NkwZaeMMLDva9barj4MMx

FAULTS THAT FLASH A SIGNAL TO ADT These Defects Shut Down Complete Plant leak In brine system drops liquid level to trip Boot switch Drop In brine tomperoture operates detocter in cooler hood Failure of cooling water flow sets off pressure-control reloy Interruption of dc feed to motors drops out voltoge relay Excessive refrigerant-pressures operate high-pressure cutouts These Defects Shut Down Individual Machines By NILS R BCRNZ a jfVka Ptaiidanl and DlrtCtOt of Ingtg MerrAonh Refngtrotion Co .7 - Here is another milestone inj Ht the trend toward automatic V \ plant operation. Merchants ^ refrigeration warehouse inf Hopkins, Minn, can be left:-] unattended for long periods j with relays keeping constant 3 \ watch. Trouble flashes lamp**.' : in the ADT central office. Ex*') i perience shows . . . PLANT OPERATOR, called by ADT, clears trouble, then puts machines back In operation Rise In ammonia level, in accumulators of blast freezer, brine cooler and ammonia-cooled Intercooler, trips relays 1 Drop in lube pressure operates compressor oil-failure switch o High temperature In blasMreeier room sets off thermostat ...Unattended! ENGINEEIINO AND MANAGEMENT SECTION POWH Plant Runs Smooth With Remote Signals ENGINEERING AND MANAGEMENT SECTION MORS ON NEXT PAOE