Bard WA4842 Installation Instructions Manual

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Bard WA4842 Installation Instructions Manual Manual pdf 15 page image

Manual 2100-401APage 15 of 21WIRING – MAIN POWERRefer to the unit rating plate for wire sizing informationand maximum fuse or “HACR” type circuit breakersize. Each outdoor unit is marked with a “MinimumCircuit Ampacity”. This means that the field wiringused must be sized to carry that amount of current.Depending on the installed KW of electric heat, theremay be two field power circuits required. If this is thecase, the unit serial plate will so indicate. All modelsare suitable only for connection with copper wire. Eachunit and/or wiring diagram will be marked “Use CopperConductors Only”. These instructions must be adheredto. Refer to the National Electrical Code (NEC) forcomplete current carrying capacity data on the variousinsulation grades of wiring material. All wiring mustconform to NEC and all local codes.The electrical data lists fuse and wire sizes (75° Ccopper) for all models including the most commonlyused heater sizes. Also shown are the number of fieldpower circuits required for the various models withheaters.The unit rating plate lists a “Maximum Time DelayRelay Fuse” or “HACR” type circuit breaker that is tobe used with the equipment. The correct size must beused for proper circuit protection and also to assure thatthere will be no nuisance tripping due to the momentaryhigh starting current of the compressor motor.The disconnect access door on this unit may be lockedto prevent unauthorized access to the disconnect. Toconvert for the locking capability, bend the tab locate inthe bottom left hand corner of the disconnect openingunder the disconnect access panel straight out. This tabwill now line up with the slot in the door. When shut, apadlock may be placed through the hole in the tabpreventing entry.See “Start Up” section for important information onthree phase scroll compressor start ups.TABLE 3THERMOSTAT WIRE SIZEremrofsnarTAV ALF eguaGeriWmumixaMecnatsiDteeFnI55 3.2eguag02eguag81eguag61egaug41egaug215406001061052WIRING – LOW VOLTAGE WIRING230 / 208V, 1 phase and 3 phase equipment dualprimary voltage transformers. All equipment leaves thefactory wired on 240V tap. For 208V operation,reconnect from 240V to 208V tap. The acceptableoperating voltage range for the 240 and 208V taps are:TAP RANGE240 253 – 216208 220 – 187NOTE: The voltage should be measured at the fieldpower connection point in the unit and while theunit is operating at full load (maximumamperage operating condition).Five (5) wires should be run from thermostat subbase tothe 24V terminal board in the unit. A five conductor, 18gauge copper, color-coded thermostat cable isrecommended. The connection points are shown inFigure 9.TABLE 4WALL THERMOSTATtatsomrehT serutaeFetanimoderP750-3048)3511D0225HT(taeHegats1;looCegats1elbammargorP-noNcinortcelErevoegnahclaunaMrootuA850-3048)1511D0225HT(taeHegats2;looCegats2elbammargorP-noNcinortcelErevoegnahclaunaMrootuA940-3048)083-39F1(taeHegats2;looCegats2cinortcelEelbammargorPrevoegnahclaunaMrootuA