
Application guidelines
15
FRCC.PC.002.A5.22
Operating conditions
Operating envelope
R404A / R507
Discharge temperature
protection
Even when the motor windings are protected
against overheating by the internal motor
protection, 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 temperature 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 the discharge line as
indicated below at no more than 5.9 inch from
the discharge connection.
Refrigerants and
lubricants
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
temperature glide. It must therefore be charged
in the liquid phase. For most other aspects
however, this small glide may be neglected. R507
is an azeotropic mixture without temperature
glide.
Maneurop® NTZ compressors are designed and
optimised for refrigerants R404A and R507.
The use of hydrocarbons is not authorised in NTZ
compressors.
Only approved refrigerants and lubricants as
listed in below table may be used.
80
85
90
95
100
105
110
115
120
125
130
135
140
145
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
Condensing temper
ature (°F)
Evaporating temperature (°F)
S.H. = 20°F
2 cyl
RGT 68°F
S.H. = 20°F
1 & 4 cyl
Thermostat
Insulation
Bracket
Discharge line
Refrigerant
Type*
ODP**
Temp.glide***
(°F)
Lubricant
R404A
HFC
0
1.3
160Z polyolester
lubricant, factory charged (160SZ - 160PZ
allowed alternatively)
R507
0
*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
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