15
REFRIGERANTS AND LUBRICANTS
Maneurop® NTZ compressors are de-
signed and optimised for refrigerants
R404A and R507A. Alternatively, refrig-
erants R407A and R407B can be used
with NTZ compressors, however these
may lead to reduced performance
characteristics and operating envelop.
The use of hydrocarbons is not author-
ised in NTZ compressors.
Only approved refrigerants and lubri-
cants as listed in below table may be
used.
Because of their thermodynamic
properties, R404A and R507A are es-
pecially suitable for low and medium
temperature applications. Danfoss
recommends the use of these refriger-
ants with NTZ compressors. Note that
R404A has a small temperature glide. It
must therefore be charged in the liquid
phase. For most other aspects howev-
er, this small glide may be neglected.
R507A is an azeotropic mixture without
temperature glide.
R407A and R407B have different
thermodynamic properties than
R404A and R507A. Especially their
larger temperature glide shall not be
neglected. Using these refrigerants the
NTZ compressor capacity will be lower
than published in this document and
because of a higher discharge tem-
perature, the operating envelope will
be reduced.
*Type: HFC: Hydro uorcarbon (no chlorine component, "long-term" zero-ODP alternative)
**ODP: Ozone Depletion Potential (base R11; ODP = 1)
*** Temperature glide: di erence between saturated vapor temperature and saturated liquid
temperature at constant pressure
Refrigerant Type* ODP**
Temp.
glide***
(K)
Lubricant Remarks
R404A
HFC 0
0.7
160Z polyolester
lubricant, factory charged
(160SZ allowed
alternatively)
Recommended
R507A 0
R407A 6.6
Reduced
performance and
envelope
R407B 4.4
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