Operating Conditions; Refrigerants And Lubricants; Operating Envelope R404A / R507; Discharge Temperature Protection - Danfoss Maneurop NTZ Series Application Manuallines

Application guidelines
Refrigerants and
lubricants
Operating envelope
R404A / R507
Discharge temperature
protection

Operating conditions

Maneurop® NTZ compressors are designed and
optimised for refrigerants R404A and R507.
The use of hydrocarbons is not authorised in NTZ
compressors.
Refrigerant Type*
R404A
HFC
R507
*Type: HFC: Hydrofluorcarbon (no chlorine component, "long-term" zero-ODP alternative)
**ODP: Ozone Depletion Potential (base R11; ODP = 1)
*** Temperature glide: difference between saturated vapor temperature and saturated liquid temperature at constant
pressure
Because of their thermodynamic properties,
R404A and R507 are especially suitable for low
and medium temperature applications. Danfoss
recommends the use of these refrigerants with
NTZ compressors. Note that R404A has a small
145
140
S.H. = 20°F
1 & 4 cyl
135
130
125
120
115
110
105
100
95
90
85
80
-55 -50 -45 -40
Even when the motor windings are protected
against overheating by the internal motor protec-
tion, the compressor discharge gas temperature
could exceed the maximum allowed value of
275°F when the compressor is operated outside
its application envelope. The most effective
protection against too high discharge gas tem-
perature is to mount a discharge gas thermostat.
An accessory kit is available from Danfoss which
includes the thermostat, mounting bracket and
insulation. The thermostat must be attached to
Only approved refrigerants and lubricants as
listed in below table may be used.
Temp.glide***
ODP**
(°F)
1.3
0 lubricant, factory charged (160SZ allowed
0
temperature glide. It must therefore be charged
in the liquid phase. For most other aspects how-
ever, this small glide may be neglected. R507 is
an azeotropic mixture without temperature glide.
S.H. = 20°F
2 cyl
RGT 68°F
-35 -30 -25 -20 -15 -10
Evaporating temperature (°F)
the discharge line as indicated below at no more
than 5.9 inch from the discharge connection.
Discharge line
Bracket
Lubricant
160Z polyolester
alternatively)
-5 0 5 10 15 20
Thermostat
Insulation
FRCC.PC.002.A4.22
15