Eaton SM87BG Technical Manual

2Call points sM87BG/pBEnglish Call points sM87BG/pB TM146 January 2023 www.eaton.com3.0 OperationThe operating voltage of the unit is stated on the unit label.SM87BG General arrangementSM87BG units - operationThe unit is operated by breaking the glass element in thefront of the cover using the hammer attached to the unit.If a lift flap has been specified, this will need to be raisedfirst to gain access to the glass element.SM87BG unit - resetting procedurea. To replace the glass, a kit containing O-rings and glassis provided.b. Unscrew and remove the circular bezel on the front ofthe unit.c. Remove the original O-rings and glass and ensure thegrooves in the bezel and cover are clean.d. Fit the larger O-ring into the groove on the cover.e. Fit the smaller O-ring into the groove on the undersideof the bezel:-I. Offer the O-ring up to the groove.II. Place thumbs of both hands side by side ontothe O-ring.III. Press the O-ring down into the groove circumferencemaintaining even pressure, forcing the O-ring into thegroove.IV. The O-ring should be fully seated in the groove andnot fall out when fitting the bezel to the cover.V. Centralise the new glass element on the coverf. Place the new glass element into position on thecover and assemble the bezel over the top of the glasselement.g. Ensure the glass element stays central on the coverby holding down the glass with thumb through thehole in the centre of the bezel.h. Carefully use the glass element to depress theplunger until the glass is in full contact with the coverO-ring. Ensure there is an even gap around the glass.Without allowing the glass element to move, screwdown the bezel until the bottom of the bezel istightened against the cover.