Brochure

Applying variable
speed technology
keeps getting easier
Variable speed technology offers flexible design possibilities
with a wide range of cooling capacities to match different
applications and needs. It offers savings in reduced inventory
and complexity. In addition, some system components
are not always longer needed, including soft starter, phase
protectors, etc., and water buffer tanks have been either
reduced or eliminated – all of which helps to ensure the
competitiveness of development costs.
Danfoss inverter scrolls VZH – 3
rd
generation with IDVs
3
rd
generation of Danfoss inverter scrolls have been optimized
for part-load operations to deliver a high level of efficiency
across a wide range of applications. The prequalified
compressor and drive packages reduce
development time while increasing
reliability. The Danfoss inverter scroll VZH
with IDVs ranges from 4 to 26TR (52TR
when used in hybrid tandems@ full speed)
in one circuit. The 3
rd
generation of inverter
scrolls VZH features extended operating
map to fit more applications especially
Close Control / CRAC units. It is the widest variable speed scroll
lineup available in the world commercial HVAC market today.
Danfoss Turbocor® compressors
Danfoss Turbocor® compressors have transformed the
commercial HVAC market with innovative technology that
redefines lifetime operating costs for chiller applications.
Danfoss Turbocor®’s family of centrifugal compressors is
the world’s first range of totally oil-free compressors. They
feature innovative yet proven technologies including
magnetic bearings, variable-speed centrifugal compression
and digital controls.
All Danfoss Turbocor® TT and TG as well as TTH and TGH series
have the same physical size and connection locations. They
also use the same controls and monitoring interface module
and standard mounts. Their extremely compact size and low
weight allows OEMs and contractors to cost-effectively install
the compressor with a much smaller footprint than
conventional compressors. Exceptional low-
noise operation with no vibration
eliminates the need for
additional noise protection.
IDV technology
Intermediate Discharge Valves (IDVs) are
mechanical valves that improve the part-
load efficiency of air conditioning systems.
Danfoss patented IDVs are being
integrated into the 7.5 to 50 ton range of
the Danfoss DSH scrolls and in inverter
scrolls. The new Danfoss scroll range
with IDVs is backward compatible
with existing Danfoss scrolls to reduce
complexity and minimize any need for
redesign and qualification.
7Compressors for Commercial Air Conditioning