AAF UV05 Operation & Maintenance Manual
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Contents
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McQuay OM 751 41Diagnostics and ServiceDiagnostics and ServiceThe most important aspect of troubleshooting unit ventilator controls is to isolate the source ofthe problem into one of two categories:1 The problem resides within the UVC.2 The problem is external to the UVC. Under most circumstances the problem is external tothe UVC.Alarm and Fault MonitoringThe UVC is programmed to monitor the unit for specific alarm conditions. If an alarmcondition exists, a fault occurs. When a fault exists, the following occurs:• The UVC indicates the fault condition by displaying the fault code on the keypad/display.• The remote wall-mounted sensor (optional) LED flashes a pattern indicating that a faultcondition exists.• The fault signal binary output energizes.• The fault performs the appropriate control actions as described for each fault.Manual reset faults can be reset in one of three ways:• By cycling the unit power.• Via the keypad/display menu.• Via the network interface.Table 22: Alarm and fault code summaryPriority Fault description ResetKeypad/display faultcodes1 Space Temp Sensor Failure Auto F02 DX Pressure Fault 2-Auto in 7 days, then Manual F13 Compressor Envelope Fault 2-Auto in 7 days, thenManual* F24 Discharge Air DX Cooling Low Limit Indication Auto F35 Condensate Overflow Indication Auto F46 Space Coil DX Temp Sensor Failure Auto F57 Outdoor Temp Sensor Failure Auto F68 Discharge Air Temp Sensor Failure Auto F79 Water Coil DX Temp Sensor Failure Auto F810 Water-out Temp Sensor Failure Auto F911 Space Humidity Sensor Failure Auto FA12 Outdoor Humidity Sensor Failure Auto Fb13 Space CO2 Sensor Failure Auto FC14 Not used Fd15 Not used FE16 Change Filter Indication Manual FF17 EPROM Memory Indicator Replace conroller board EE18 Configuration Display Download file --* Rev 1_27 has auto reset |
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