Classic 20 ACU Installation, Operating & Maintenance Manual
AC-2 CS020020 USACG-6 Manual Rev B Page 2 of 16
Contents
1 GENERAL SAFETY & WARNING INSTRUCTIONS ................................................................... 3
2 UNPACKING, HANDLING & INITIAL INSPECTION.................................................................. 3
3 MODELS COVERED BY THIS MANUAL ...................................................................................... 4
3.1 MODEL IDENTIFICATION ................................................................................................................ 4
3.2 GENERAL PERFORMANCE DATA ..................................................................................................... 4
4 DIMENSIONS & INSTALLATION.................................................................................................. 5
4.1 PRODUCT DRAWING ...................................................................................................................... 5
4.2 MOUNTING TEMPLATE ................................................................................................................... 6
4.3 GASKET INSTALLATION ................................................................................................................. 7
4.4 INSTALLATION AND CONNECTIONS ................................................................................................ 7
4.5 UNIT OPERATION .......................................................................................................................... 7
5 USACG-6 INTELLIGENT CONTROLLER OPERATION ............................................................ 8
5.1 USACG-6 CONTROLLER DIAGRAM ................................................................................................ 8
5.2 MODIFY HEATING SET POINT .......................................................................................................... 8
5.3 MODIFY COOLING SET POINT .......................................................................................................... 9
5.4 CHANGE UNIT OF MEASURE ........................................................................................................... 9
5.5 DEBUGGING THE SYSTEM............................................................................................................... 9
5.5.1 Observing the return temperature and fault codes .................................................................. 9
5.5.2 Initiating the “TEST” sequence ............................................................................................10
5.5.3 Resetting the controller to factory defaults ............................................................................10
6 MAINTENANCE ..............................................................................................................................11
6.1 PREVENTATIVE MAINTENANCE SCHEDULE ....................................................................................11
6.2 EVAPORATOR AND CONDENSER COIL CLEANING ...........................................................................12
6.3 COMPRESSOR & REFRIGERANT SYSTEM ........................................................................................12
6.4 BLOWERS ....................................................................................................................................12
6.5 FILTERS .......................................................................................................................................12
6.6 OVERLOAD TEMPERATURE LIMITING DEVICE................................................................................12
6.7 TROUBLESHOOTING......................................................................................................................13
6.8 WIRING DIAGRAM ........................................................................................................................14
7 WARRANTY ....................................................................................................................................15
8 RETURN MATERIAL AUTHORIZATION PROCEDURE ..........................................................16
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