LabRepCo GM-ULT-1786 Owner's Manual
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11Part number 21729, Rev 4HIGH AMBIENT TEMP – Activates when the ambient temp probe reading is above 36 C.LOW BATTERY – Activates when the result of a battery test returns a reading of less than11.0 VDC.H S SYSTEM FAILURE – Activates when the high stage heat exchanger probe is unable toreach at least -33 C after running the high stage compressor for 30 minutes.L S SYSTEM FAILURE – Activates when the high stage heat exchanger probe reaches areading of -55 C or below.AIR FLOW PROBLEM – Activates when a calculation shows that the difference betweenthe ambient temperature and the condenser temperature probes is greater than 10 C.LOW LINE VOLTAGE – Activates when the incoming AC power voltage is below 90 VACon a 115 V unit or 180 VAC on a 230 V unit for more than 1 minute.HIGH LINE VOLTAGE – Activates when the incoming AC power voltage is above 135 VACon a 115 V unit or 265 VAC on a 230 V unit for more than 1 minute.PROBE FAILURE (Control, Heat Exchanger, Condenser, Ambient, Sample) – Activateswhen either of the following conditions is detected on this probe: A resistance value over250 ohms, indicating an open sensor, or a reading below 20 ohms, indicating a shortedsensor. The same criteria will apply to the remaining probe failure alarms.PROBE UNPLUGGED (Control, Heat Exchanger, Condenser, Ambient and Sample) –Each probe has a two-pin logic control as part of its connector, which will be used to detectthat the sensor is properly connected. This alarm shows that the system detected thisprobe is not connected. This same description applies to all probes.FAILED BATTERY TEST – Activates when the result of a battery test returns a reading ofbad battery.INITIALIZINGIf the display board is unable to initialize properly, the message center will not display anyvalid information. This will serve as the indication of a display board initializationproblem. If the main board fails to initialize properly, it will not be able to communicatewith the display board and the display board will report a communication problem, asdescribed elsewhere.Door OpenA door open message is displayed in the message center whenever the door is opened. Ifthe door remains open for more than 1 minute, an audible alarm will sound, subject tonormal silence and ring back functions. If the door remains open continuously for 30minutes, the remote alarm contacts will activate. |
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