Danfoss VZH088-G single User Manual

System design recommendations
Compressors discharge a small percentage of oil
that is mixed with the compressed refrigerant.
The oil is circulated through the system and
the compressor is dependent on the system
design to bring it back. The use of variable speed
compressor technology in systems with long
piping, especially for split systems, is among the
most challenging congurations for oil return.
In order to prevent compressors from breaking
down due to oil level issues, Danfoss requires the
use of an oil separator in all long piping systems,
particularly for split systems.
Variable speed compressors used in split systems
as well as long piping provide an increased
challenge to system oil management due to
the reduced velocities at low speed operation.
Low oil velocity can cause oil deposits in pipes,
heat exchangers and other system components
that can cause an insucient oil level inside the
compressor.
It is the responsibility of the systems OEM to
ensure the proper oil return to the compressors
including the qualication of all possible
operating modes, equipment congurations and
accessory options (multiple evaporators, reheat
coils for example) that could impact oil return to
the compressors.
Especially for split systems using variable speed
compressors, in which every installation is unique
and qualication of individual installations is not
practical, Danfoss requires that OEMs install an oil
separator.
The requirement of an oil separator is also
suitable for any other system with complex
piping (long line set, U trap…), multiple heat
exchangers and elevation changes.
Many oil separator designs exist, the selection,
requirements and recommendations of the Oil
Separator manufacturer should be followed.
Customers have the opportunity to select
Chiyoda (CE marked) since it has been tested
successfully by Danfoss. Detailed information
hereafter.
Please note that an oil separator is not 100%
ecient. A good system design and ecient oil
management remain essential.
Oil management
Check valve
Oil separator
Strainer
Solenoid valve
Capillary
46 FRCC.PC.023.A8.02
Application Guidelines

Danfoss VZH088-G single Specifications

General

Brand	Danfoss
Model	VZH088-G single
Category	Air Compressor
Language	English