Bard WG Series Installation Instructions Manual

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Bard WG Series Installation Instructions Manual Manual pdf 42 page image

Manual 2100-587JPage 42 of 59COMPRESSOR SOLENOID(See Sequence of Operation on page 37 for function.)A nominal 24-volt direct current coil activates theinternal compressor solenoid. The input controlcircuit voltage must be 18 to 28 volts AC. The coilpower requirement is 20 VA. The external electricalconnection is made with a molded plug assembly.This plug contains a full wave rectifier to supply directcurrent to the unloader coil.Compressor Solenoid Test ProcedureIf it is suspected that the unloader is not working, thefollowing methods may be used to verify operation.1. Operate the system and measure compressoramperage. Cycle the compressor solenoid onand off at 10-second intervals. The compressoramperage should go up or down at least 25%.2. If Step 1 does not give the expected results, shutunit off. Apply 18 to 28 volts AC to the solenoidmolded plug leads and listen for a click as thesolenoid pulls in. Remove power and listen foranother click as the solenoid returns to its originalposition.3. If clicks can’t be heard, shut off power andremove the control circuit molded plug fromthe compressor and measure the solenoid coilresistance. The resistance should be 32 to 60ohms depending on compressor temperature.4. Next, check the molded plug.Voltage CheckApply control voltage to the plug wires (18 to 28volts AC). The measured DC voltage at the femaleconnectors in the plug should be around 15 to 27 VDC.Resistance CheckMeasure the resistance from the end of one moldedplug lead to either of the two female connectors in theplug. One of the connectors should read close to zeroohms, while the other should read infinity. Repeatwith other wire. The same female connector as beforeshould read zero, while the other connector againreads infinity. Reverse polarity on the ohmmeter leadsand repeat. The female connector that read infinitypreviously should now read close to zero ohms.Replace plug if either of these test methods does notshow the desired results.SERVICEFAN BLADE SETTING DIMENSIONSShown below are the correct fan blade settingdimensions for proper air delivery across the outdoorcoil.Any service work requiring removal or adjustment in thefan and/or motor area will require that the dimensionsbelow be checked and blade adjusted in or out on themotor shaft accordingly (see Table 11).REMOVAL OF FAN SHROUD1. Disconnect all power to unit.2. Remove the screws holding both grills— one oneach side of unit—and remove grills.3. Remove screws holding fan shroud to condenserand bottom – nine (9) screws.4. Unwire condenser fan motor.5. Slide complete motor, fan blade and shroudassembly out the left side of the unit.6. Service motor/fan as needed.7. Reverse steps to reinstall.FIGURE 19Fan Blade Setting"A"AIRFLOWMIS-1724TABLE 11Fan Blade DimensionsModel Dimension AWG3S2WG4S2WG5S21.75"