Operating conditions
SZ240 to 380 & SY240-300
R407C
at DEW temperature
SZ084 to 185 & SY185
R407C
at DEW temperature
Application envelopes at
mean temperatures
Refrigerant R407C is a zeotropic mixture,
which causes a temperature glide in both the
evaporator and condenser. When discussing
evaporating and condensing temperatures
therefore, it is important to indicate whether
these are DEW point values or MEAN point
values. In the figure below, the dashed lines
reflect constant temperature and do not
correspond with the constant pressure lines.
For a given cycle, the MEAN point temperatures
are typically about 35.6° to 37.4°F lower than
DEW point temperatures. In these Selection and
Application Guidelines, Danfoss Commercial
Compressors displays temperatures as DEW
point values.
The performance tables for R407C are also based
on DEW point values.
80
90
100
110
120
130
140
150
160
-10
0
10
20
30
40
50
60
C
ondensing t
emper
atur
e (°F)
Evaporating temperature (°F)
Dew temperature conditions
S.H. = 54°F SUPERHEAT
S.H. = 20°F
80
90
100
110
120
130
140
150
160
-10
0
10
20
30
40
50
60
70
S.H. = 54 °F
SUPERHEAT
S.H. = 20°F
C
ondensing t
emper
atur
e (°F)
Evaporating temperature (°F)
Dew temperature conditions
Application guidelines
28
FRCC.PC.003.A5.22
