Operating Envelopes; Application Envelopes At Dew Temperatures - Danfoss Performer SM Series Selection & Application Manuallines

opeRating enVelopes

application envelopes
at dew temperatures
sM 084 to sM 185
sY 240 to sY 380
R-22
sZ 084 to sZ 185
R-134a
8
The figures below show the operat-
ing envelopes for SM / SY compres-
sors with refrigerant R-22 and for SZ
compressors with refrigerants R-407C,
R-134a, R-404A and R-507A. Operat-
ing limits define the envelope within
which reliable compressor operation
is guaranteed.
Because discharge temperature de-
pends on the combination of evapo-
rating temperature, condensing tem-
perature and suction gas superheat,
discharge temperature limits are
indicated by a double line. The solid
line represents the limit when the su-
perheat is 20 o F or less. The dotted line
160
Condensing temp. limits
150
140
130
120
S.H. = 20 o F
110
100
90
80
-10 0 10
Evaporating temperature [°F]
160
Condensing temp. limits
150
140
130
120
110
100
90
80
-10 0 10
Evaporating temperature [°F]
shows the limit when the superheat is
54 F. Interpolate for superheat values
o
between 20
• Maximum
perature: +275
• Maximum
+145 o F (for SM / SZ 084 to 185),
+125 F (for SY / SZ 240 to 380)
o
• A suction superheat below 10
recommended due to risk of liquid
floodback
• Maximum superheat: 54
• Minimum and maximum evapo-
rating and condensing temperatures
as per the operating envelopes.
S.H. = 54 F
o
SUPERHEAT
20 30 40 50 60
S.H. = 20 o F
S.H. = 54 F
o
SUPERHEAT
20 30 40 50
o F and 54 o F.
discharge gas tem-
F
o
ambient temperature:
o F is not
o F
60