REFRIGERATION
GENERAL (CONT.)
Figure 20: 45° Elbow Suction Line
TEMPERATURE CONTROL ADJUSTMENT
When factory installed, the temperature control is located toward the right end of the case in the electrical box. The sensing bulb is
located under the coil cover on the back side of the fan shroud. It can be wired in series with the low-pressure (L.P.) control. It can also
be used in a pump down system by wiring it in series with the liquid solenoid valve. A thermostat is shown in Figure 22 on page 25.
Discharge air temperature probes for electronic case controllers may be installed in many different customer specied locations
including, but not limited to, honeycomb, ceiling pocket cover, rear wall, and return air.
LEAK-CHECK/EVACUATION/CHARGING
After all of the refrigeration piping and system components have been assembled, the entire system must be pressurized and checked
for leaks.
When the system is leak free, evacuate with a deep vacuum pump. Triple evacuation to a minimum of 500 microns and nitrogen sweep
is recommended. After the system has been thoroughly evacuated of all moisture and non condensable gas, charge the system with the
proper refrigerant, using “hi-side/low-side” charging techniques.
24 • Refrigeration - General
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