RECIPROCATING COMPRESSORS
11
REFRIGERANTS AND LUBRICANTS
Maneurop® NTZ compressors are de-
signed and optimised for refrigerants
R404A and R507A. Alternatively, refri-
gerants R407A and R407B can be used
with NTZ compressors, however these
may lead to reduced performance cha-
racteristics and operating envelop.
Refrigerant R502 can be used in NTZ
compressors in countries that are not
signatory member countries of the
Because of their thermodynamic pro-
perties, R404A and R507A are espe-
cially suitable for low and medium
temperature applications. Danfoss
recommends the use of these refrige-
rants with NTZ compressors. Note that
R404A has a small temperature glide. It
must therefore be charged in the liquid
phase. For most other aspects howe-
ver, this small glide may be neglected.
R507A is an azeotropic mixture without
temperature glide.
*Type: HFC: Hydrofluorcarbon (no chlorine component, "long-term"
zero-ODP alternative)
CFC: Chlorofluorcarbon (with chlorine component)
HCFC: Hydrochlorofluorcarbon (with chlorine component)
**ODP: Ozone Depletion Potential (base R11; ODP = 1)
*** Temperature glide: difference between saturated vapor temperature and
saturated liquid temperature at constant pressure
Montreal protocol. In such installation
the factory charged polyolester (POE)
lubricant must be replaced by mineral
oil.
The use of hydrocarbons is not autho-
rised in NTZ compressors.
Only approved refrigerants and lubri-
cants as listed in below table may be
used.
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 tempe-
rature, the operating envelope will be
reduced.
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
R502
CFC
HCFC
mixture
0.23 0
Replace factory charged
160Z POE lubricant by
160P mineral oil
Check local
legislation
(Montreal protocol)
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