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The system is designed to operate both the hopper and
evaporator simultaneously at different temperatures.
The system is designed for efficient use with R404A as
the refrigerant. The proper charge is indicated on the
nameplate and on the compressor.
The compressor has an internal high-pressure bypass.
This bypass eliminates the need for a high-pressure
cutout switch on air-cooled models. Water-cooled models
must have a high-pressure cutout switch.
4.2
EVAPORATORS
The hopper and barrel evaporators are wrapped with
copper tubing and thermomastic, then insulated with
foam insulation. The compressor is designed specifically
for use with R404A.
4.3
COMPRESSOR WINDING TEST
To test the compressor motor windings for possible
problems, perform the following steps:
Warning
DISCONNECT FREEZER FROM ELECTRICAL
SUPPLY SOURCE BEFORE SERVICING.
1. Remove the Phillips head screw from the bottom of
the left side panel and slide the side panel down and
out.
2. Remove the compressor terminal cover by inserting
a standard screwdriver between the terminal cover
and compressor cover frame: then, gently pry off from
the right side, then the left (Figure 28).
Figure 28. Compressor Terminal Cover
3. Remove wires C, R, and S at compressor. Refer to
Figure 29 for compressor connections.
Figure 29. Compressor Connections
The following values are average for most
Copeland compressors. For exact values or other
brands, consult the manufacturer's service data
manual.
4. Connect an ohmmeter to terminals C and R.
Resistance through the run winding should be 3.12
to 3.60 ohms with the ohmmeter set at ohms x 1
(Figure 30).
Figure 30. Ohmmeter and Connections
18
NOTE
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