Danfoss VZH Series - Vzh088-117-170 - Hybrid Manifolding Manifold Compressors

Application guidelines
74 FRCC.PC.023.A7.22
Manifold compressors
VZH088-117-170 - hybrid manifolding
General overview ................................................................................................................................75
Scope ............................................................................................................................................................................................................75
Benets.........................................................................................................................................................................................................75
Oil management concept ...................................................................................................................76
Systems ........................................................................................................................................................................................................76
Oil separator ............................................................................................................................................................................................... 78
Approved hybrid tandem congurations and capacity range ................................................................................................80
System design recommendation .......................................................................................................81
Electronic expansion valve ...................................................................................................................................................................81
Pressure switch settings .........................................................................................................................................................................81
Essential piping design considerations ............................................................................................................................................ 81
Cycle rate limit of SH compressors ..................................................................................................................................................... 82
Defrost cycle logic .................................................................................................................................................................................... 82
Installation and service ......................................................................................................................83
Handling ...................................................................................................................................................................................................... 83
Compressor mounting ...........................................................................................................................................................................83
Tightening torques .................................................................................................................................................................................. 83
Rubber connection .................................................................................................................................................................................. 83
Tandem piping design ............................................................................................................................................................................84
Wiring and rotation direction ..............................................................................................................................................................84
Failure analysis ...........................................................................................................................................................................................84
Oil equalisation connection..................................................................................................................................................................84
Refrigerant charge limit .........................................................................................................................................................................84
Ordering information .........................................................................................................................85
VZH088 ................................................................................................................................................87
Compressor mounting ...........................................................................................................................................................................88
Oil equalization connection .................................................................................................................................................................88
Suction washer ..........................................................................................................................................................................................89
VZH117 ................................................................................................................................................90
Compressor mounting ...........................................................................................................................................................................90
Oil equalisation connection..................................................................................................................................................................91
Suction washer ..........................................................................................................................................................................................91
VZH170 ................................................................................................................................................92
Compressor mounting ...........................................................................................................................................................................92
Oil equalisation connection..................................................................................................................................................................93
Suction washer ..........................................................................................................................................................................................93