Bard W18H2-A Installation Instructions Manual

Bard W18H2-A Installation Instructions Manual Manual pdf 14 page image

Manual 2100-604APage 14 of 28WIRING – MAIN POWERRefer to the unit rating plate for wire sizing informationand maximum fuse or circuit breaker size. Eachoutdoor unit is marked with a “Minimum CircuitAmpacity”. This means that the field wiring used mustbe sized to carry that amount of current. Dependingon the installed KW of electric heat, there may betwo field power circuits required. If this is the case,the unit serial plate will so indicate. All models aresuitable 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 delay relayfuse or circuit breaker that is to be used with theequipment. The correct size must be used for propercircuit protection and also to assure that there willbe no nuisance tripping due to the momentary highstarting 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 locatedin the bottom left-hand corner of the disconnectopening under the disconnect access panel straightout. This tab will now line up with the slot in the door.When shut, a padlock may be placed through the holein the tab preventing entry.See “Start Up” section for important information onthree phase scroll compressor start ups.See Table 4 for Electrical Specifications.WIRING – LOW VOLTAGE WIRINGAll 230/208V 1 phase and 3 phase equipment havedual primary voltage transformers. All equipmentleaves the factory wired on 240V tap. For 208Voperation, reconnect from 240V to 208V tap. Theacceptable operating voltage range for the 240 and208V taps are:TAP RANGE240 253 – 216208 220 – 187NOTE: The voltage should be measured at the fieldpower connection point in the unit and whilethe unit is operating at full load (maximumamperage operating condition).For wiring size and connections, refer to WiringManual 2100-516.