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Rules of thumb for Freezer (low temp), Cooler (medium temp) and Air-Conditioning (high temp) Systems

 

Type of system High Medium Low
A) Compressor discharge temperature 120> 210 120> 210 130> 225
B) Condenser liquid line temperature less then 135 less then 130 less then 120
C) Evaporator suction temperature +31 > +86 0 > +40 minus 30 > +20
D) Compressor suction temperature minus "C" 0 > 5 deg rise 3 > 10 deg rise 5 > 15 deg rise
E) Outdoor temperature 50 >+110 ? > +110 ? > +110
F) Box (Indoor) temp. 65 > 95 20 > 55 -40 >+10
G) Evaporator air temperature split  15 > 22 8 > 12 5 > 10
H) Condenser air temperature split 15 > 30 10 > 30 5 > 30
I) Evaporating Temp. (pressure converted to temp) +28 > +50 +7 > +35 -30 >+10
J) Condensing Temp. (pressure converted to temp) ** 20 to 30 over "E" 15 to 30 over "E" 15 to 30 over "E"
CALCULATED VALUES      
Evaporator superheat "C" minus "I" 6 > 42* (10 txv) 3 > 30* (5 txv) 3 > 40* (3txv)
Condenser subcooling "J" minus "B" 0 > 20* 5>25 txv 0 > 20* 5>20 TXV 0 > 20* 5>15 TXV
Evaporator Delta T "F" minus "I" 30 > 45 10 > 25 10 > 20
Condenser Delta T "E" minus "J" *** 20 > 35 15 > 30 15 > 30
 

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