Bard W42AC-A Installation Instructions Manual

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Bard W42AC-A Installation Instructions Manual Manual pdf 26 page image

Manual 2100-692Page 26 of 40Low Pressure DetectionLow pressure switch monitoring allows for a lockoutcondition in a situation where the switch is open. Ifthe low pressure switch remains open for more than2 minutes. the CCM will de-energize the compressorfor the delay-on-break time. If the switch closes again,it will then restart the compressor. If the switch tripsagain during the same Y call, the compressor will bede-energized and the alarm terminal will be energizedindicating an alarm. The blue LED will light andstay on until power is cycled to the control or a lossof voltage is present at Y terminal for more than ½second.High Pressure DetectionHigh pressure switch monitoring allows for a lockoutcondition in a situation where the switch is open. Ifthe high pressure switch opens, the CCM will de-energize the compressor. If the switch closes again,it will then restart the compressor after the delay-on-break setting has expired on the device. If theswitch trips again during the same thermostat call,the compressor will be de-energized and the alarmterminal will be energized indicating an alarm. Thered LED will light and stay on until power is cycledto the control or a loss of voltage is present at Yterminal for more than ½ second.Test ModeBy rapidly rotating the potentiometer (POT) clockwise(see Figure 22), all timing functions will be removedfor testing.The conditions needed for the unit to enter test modeare as follows: POT must start at a time less than orequal to the 40 second mark. The POT must then berapidly rotated to a position greater than or equal tothe 280 second mark in less than ¼ second. Normaloperation will resume after power is reset or after theunit has been in test mode for at least 5 minutes.Brownout Protection with AdjustmentBrownout protection may be necessary if the utilitypower or generator power has inadequate power toprevent the voltage from dropping when the compressorstarts. This is rare but can happen if the generatoris undersized at the site or if the site is in a remotelocation far from the main power grid. Under normalcircumstances, allowing the brownout to be ignored fora time period should not be needed. The 8201-164 isshipped with all the DIP switches in the 'off' or 'do notignore' position (see Figure 22).If ignoring the brownout is needed because of theabove conditions, three preset timers can be set by DIPswitches in order to delay signaling a power brownoutfor a specific length of time after compressor contactoris energized. This allows the compressor a time periodto start even if the voltage has dropped and allows thevoltage to recover. This delay only happens when theCC terminal energizes. The delay can be set to 500milliseconds (A DIP switch), 1000 milliseconds (B DIPswitch) or 1500 milliseconds (C DIP switch); time isnot cumulative—only the longest setting will apply. Ifthe voltage recovers during the brownout time period,the compressor will start.If a brownout condition is detected by the 8201-164,the troubleshooting light will flash blue. The light willcontinue to flash until the cooling call is satisfied orpower is removed from the Y terminal. This conditiondoes not prevent operation, it only indicates that abrownout condition was present at some point duringthe cooling call. If a brownout condition is detected,CC will be de-energized and will retry after the delay-on-make timer is satisfied; this process will continueuntil call is satisfied.If user chooses the 'do not ignore' position when thesite has inadequate utility or generator power, thiscould lead to the compressor never starting. Thecontrol will see the brownout immediately and not start.A common scenario and one that has been seen in thefield is when a unit or units switches from utility powerto generator power. With slower transfer switches, thetime delay between the utility power and generatorpower didn’t cause a problem. The units lost power,shut off and came back on line normally. With theintroduction of almost instantaneous transfer switches,the millisecond long power glitch can be enough thatthe compressor will start to run backwards. In thisscenario, the CCM will catch this and restart the unitsnormally.Pressure Service PortsHigh and low pressure service ports are installed onall units so that the system operating pressures can beobserved. Pressure tables covering all models can befound on pages 30 and 31. It is imperative to matchthe correct pressure table to the unit by model number.This unit employs high-flow Coremax valves instead ofthe typical Shrader type valves.WARNING! Do NOT use a Schrader valve core removaltool with these valves. Use of such a tool could resultin eye injuries or refrigerant burns!To change a Coremax valve without first removing therefrigerant, a special tool is required which can beobtained at www.fastestinc.com/en/SCCA07H. See thereplacement parts manual for replacement core partnumbers.