AGL_Unit_ZX_A2L_E_Rev00
2.14 Digital operation...............................................................................................................22
2.15 Pumpdown mode.............................................................................................................23
2.15.1 External pumpdown without XCM25D integration (not available with ZXDY units)23
2.15.2 Pumpdown by the unit controller (not available with ZXDY units) .......................23
2.15.3 Pumpdown with room thermostat (not available with ZXDY units) ......................24
2.15.4 Internal pumpdown with temperature sensor (case temperature) .......................25
2.16 Reset to factory settings –Emerson "Hot Key" ...............................................................26
2.16.1 How to save factory settings or user settings ......................................................26
2.16.2 Applicable hot key for ZX units with XCM25D controller......................................26
2.16.3 Location of the "Hot Key" plug connection on the XCM25D controller ................26
2.16.4 How to program a "Hot Key" from the controller (upload)....................................26
2.16.5 How to program a controller using an Emerson "Hot Key" (download) ...............27
2.17 Troubleshooting –Alarm history......................................................................................27
2.18 Compressor motor protection ..........................................................................................28
2.19 System pressure protection.............................................................................................28
2.20 Other inputs of the XCM25D controller............................................................................28
2.20.1 Customer-supplied control (room thermostat)......................................................28
2.20.2 Case temperature controller.................................................................................28
2.20.3 Ambient temperature sensor................................................................................28
2.21 Alarm output (DO5) of the XCM25D controller................................................................28
3Installation....................................................................................................... 29
3.1 Condensing unit handling ................................................................................................29
3.1.1 Transport and storage..........................................................................................29
3.1.2 Weights.................................................................................................................29
3.2 Refrigeration piping connections .....................................................................................30
3.2.1 Refrigeration piping installation............................................................................30
3.2.2 Brazing recommendations....................................................................................31
3.2.3 Brazing procedure................................................................................................32
3.3 Electrical connection........................................................................................................32
3.3.1 Power supply connections....................................................................................33
3.3.2 Maximum operating currents for cable selection .................................................33
3.3.3 Electrical wiring ....................................................................................................33
3.3.4 Electrical protection standard (protection class) ..................................................33
3.3.5 Terminal box.........................................................................................................33
3.3.6 Low-pressure protection.......................................................................................34
3.3.7 Crankcase heater.................................................................................................34
3.3.8 Insulation material ................................................................................................34
3.3.9 Sound and vibration .............................................................................................34
3.3.10 High-potential testing............................................................................................34
3.3.11 Circuit breaker with overcurrent protection ..........................................................35
3.4 Location & fixings.............................................................................................................35
