Danfoss VZH Series Application Manuallines page 5

Application guidelines VZH088-117-170 single compressors
Operating conditions .........................................................................................................................43
Application envelopes ............................................................................................................................................................................ 43
Short cycle timer function ..................................................................................................................................................................... 43
Discharge gas temperature protection function .......................................................................................................................... 44
Discharge gas thermostat ..................................................................................................................................................................... 44
Oil return management function (single compressor) ............................................................................................................... 45
Oil return management in hybrid manifolding ............................................................................................................................. 45
High and low pressure protection...................................................................................................................................................... 45
System design recommendations .....................................................................................................47
Essential piping design considerations ............................................................................................................................................ 47
Oil management ....................................................................................................................................................................................... 48
Heat exchangers ....................................................................................................................................................................................... 50
Refrigerant charge limits ....................................................................................................................................................................... 50
Off-cycle migration .................................................................................................................................................................................. 50
Liquid floodback during operation .................................................................................................................................................... 51
Specific application recommendations ............................................................................................52
Low ambient compressor operations ............................................................................................................................................... 52
Brazed plate heat exchangers .............................................................................................................................................................. 53
Reversible heat pump systems ............................................................................................................................................................ 53
Defrost cycle logic .................................................................................................................................................................................... 54
Sound and vibration management ...................................................................................................56
Running sound level ............................................................................................................................................................................... 56
Sound generation in a refrigeration or air conditioning system ............................................................................................. 56
Compressor sound radiation ................................................................................................................................................................ 56
Mechanical vibrations ............................................................................................................................................................................. 56
Speed by-pass ............................................................................................................................................................................................ 57
Gas pulsation ............................................................................................................................................................................................. 57
Installation ..........................................................................................................................................58
Compressor handling ............................................................................................................................................................................. 58
Mounting ..................................................................................................................................................................................................... 58
Removing connections shipping plugs ........................................................................................................................................... 58
System cleanliness ................................................................................................................................................................................... 59
Tubing ........................................................................................................................................................................................................... 59
Filter driers .................................................................................................................................................................................................. 59
Brazing and soldering ............................................................................................................................................................................. 59
Compressor connection ......................................................................................................................................................................... 59
High voltage test ...................................................................................................................................................................................... 61
System pressure test ............................................................................................................................................................................... 61
Leak detection ........................................................................................................................................................................................... 62
Vacuum pump down and moisture removal ................................................................................................................................. 62
Refrigerant charging ............................................................................................................................................................................... 62
Loss of charge protection ...................................................................................................................................................................... 62
Commissioning ......................................................................................................................................................................................... 62
Oil level checking and top-up .............................................................................................................................................................. 63
Troubleshooting .................................................................................................................................64
Ordering information and packaging ...............................................................................................67
Kit ordering and shipping ..................................................................................................................................................................... 67
Packaging .................................................................................................................................................................................................... 67
Ordering information .............................................................................................................................................................................. 67
VZH voltage code G - 380-480 Volt ................................................................................................................................................... 69
VZH voltage code G - 525-480 Volt ................................................................................................................................................... 69
VZH voltage code J - 200-240 Volt ...................................................................................................................................................... 70
Accessories ..........................................................................................................................................71
Valves, adapters, connectors & gaskets for use on suction and discharge connections ................................................ 71
Crankcase heaters & thermostats ....................................................................................................................................................... 71
Lubricant, acoustic hoods and spare parts ..................................................................................................................................... 71
Spare parts frequency converter ........................................................................................................................................................ 72
Single compressors
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FRCC.PC.023.A7.22