Carrier 50TC*17 Series Service And Maintenance Instructions

28The primary leads to the convenience outlet transformerare not factory−connected. Selection of primary powersource is a customer−option. If local codes permit, thetransformer primary leads can be connected at theline−side terminals on a unit−mounted non−fuseddisconnect or circuit breaker switch; this will provideservice power to the unit when the unit disconnect switchor circuit breaker is open. Other connection methods willresult in the convenience outlet circuit being de−energizedwhen the unit disconnect or circuit breaker is open. SeeFig. 32.GFCI MaintenancePeriodically test the GFCI receptacle by pressing theTEST button on the face of the receptacle.1. Press the TEST button on the face of the receptacle.This should cause the internal circuit of the receptacleto trip and open the receptacle.2. Check for proper grounding and power line phasingshould the GFCI receptacle fail to trip.3. Repair ground wire connections as needed and correctthe line phasing.4. Press RESET button to clear the tripped condition.Fuse On Powered TypeThe factory fuse is a Bussman “Fusetron” T−15,non−renewable screw−in (Edison base) type plug fuse.Using Unit−Mounted Convenience OutletsUnits with unit−mounted convenience outlet circuits willoften require that two disconnects be opened tode−energize all power to the unit. Treat all units aselectrically energized until the convenience outlet poweris also checked and de−energization is confirmed. ObserveNational Electrical Code Article 210, Branch Circuits, foruse of convenience outlets. Always use a volt meter toverify no voltage is present at the GFCI receptacles beforeworking on the unit.Installing a Weatherproof CoverA weatherproof while-in-use cover for the factoryinstalled convenience outlets is now required by ULstandards. This cover cannot be factory-mounted due to itsdepth. The cover must be installed at the unit installation.For shipment, the convenience outlet is covered with ablank cover plate.The weatherproof cover kit is shipped in the unit’s controlbox. The kit includes the hinged cover, backing plate andgasket.ELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personalinjury or death.Before performing service or maintenance operationson the convenience outlets, Lockout/Tagout allelectrical power to the unit.! WARNINGTOPTOPTOPWET LOCATIONSWET LOCATIONSCOVER - WHILE-IN-USEWEATHERPROOFBASEPLATE FORGFCI RECEPTACLEGASKETGFCI RECEPTACLENOT INCLUDEDC09022Fig. 33 − Weatherproof Cover Installation1. Remove the blank cover plate at the convenience out-let. Discard the blank cover.2. Loosen the two screws at the GFCI duplex outlet untilapproximately 1 / 2−in (13 mm) under the screw headsis exposed.3. Press the gasket over the screw heads. Slip the back-ing plate over the screw heads at the keyhole slotsand align with the gasket; tighten the two screws untilsnug. Do not over−tighten.4. Mount the weatherproof cover to the backing plate asshown in Fig. 33.5. Remove two slot fillers in the bottom of the cover toallow service tool cords to exit the cover.6. Check the cover installation to confirm full closingand latching.SMOKE DETECTORSSmoke detectors are available as factory−installed optionson 50TC models. Smoke detectors may be specified forSupply Air only or for Return Air without or witheconomizer or in combination of Supply Air and ReturnAir. Return Air smoke detectors are arranged for verticalreturn configurations only. All components necessary foroperation are factory−provided and mounted. The unit isfactory−configured for immediate smoke detectorshutdown operation; additional wiring or modifications tounit terminal board may be necessary to complete the unitand smoke detector configuration to meet projectrequirements.SystemThe smoke detector system consists of a four−wirecontroller (HT28TZ001) and one or two sensors(HT50TZ001). Its primary function is to shut down therooftop unit in order to prevent smoke from circulatingthroughout the building. It is not to be used as a lifesaving device.ControllerThe controller (see Fig. 34) includes a controller housing,a printed circuit board, and a clear plastic cover. Thecontroller can be connected to one or two compatible ductsmoke sensors. The clear plastic cover is secured to thehousing with a single captive screw for easy access to the