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Evaporator Superheat:
Check the evaporator superheat once the walk-in has reached the desired temperature.
Generally, systems with a design temperature drop of 10°F should have an evaporator
superheat value of 6°-10°F on freezers and 8°-12°F on coolers for maximum efficiency.
To determine the evaporator superheat:
1. Measure the suction pressure at the evaporator outlet.
2. Convert the pressure to saturation temperature referencing a temperature-pressure
chart.
3. Measure the temperature of the suction line at the expansion valve bulb. Ensure
the bulb is mounted at the correct location on the suction tube.
4. Subtract the saturation temperature reading (step 2) from the measured temperature
(step 3). The difference is the evaporator superheat.
CAUTION
Minimum compressor superheat of 20°F may override these recommendations on
systems with short line runs.
MISE EN GARDE
Une surchauffe minimale de 20 °F peut écraser ces recommandations sur les
systèmes ayant de courtes conduites.
CAUTION
The condensing unit must have the discharge pressure above the equivalent 105°F
condensing pressure (reference refrigerant charging on page 16).
Temperature minus
pressure converted
to temperature
equals superheat
Temperature
Pressure
Determining Evaporator Superheat
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