Vollrath Stoelting 100C, Service Manual

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SECTION 5
REFRIGERANT COMPONENTS AND ADJUSTMENTS
5.1 REFRIGERATION SYSTEM
This section is intended to provide qualified refrigeration
technicians with a general understanding of the refrigera-
tion system, it's components and adjustments. It is recom-
mended that any work done on the freezer be performed by
a qualified refrigeration technician.
5.2 COMPRESSOR
A.
Winding Test
To test the compressor motor windings for possible prob-
lems, perform the following steps:
WARNING
DISCONNECT FREEZER FROM ELECTRICAL
SUPPLY BEFORE SERVICING.
1. Remove the two Philips head screws from the
bottom of the back panel and slide the side panel
down, back and out.
2. Remove the compressor terminal cover by insert-
ing a standard screwdriver under the terminal
cover and retaining frame, pry out side then hold
with your hand while prying the other side. (Figure
30)
Figure 31. Check Windings
NOTE
Check your compressor handbook for proper val-
ues. (Available from compressor manufacturer.)
7. To check if windings are shorted to ground, con-
nect one ohmmeter lead to a bare metal part on the
compressor and check terminals C, R, and S.
(Fig. 32)
5.3 CONDENSER
The condenser is a air-cooled copper tube and aluminum
fin type. Condensing is totally dependent upon air flow. A
plugged condenser or restrictions in the louvered side
panel will restrict air flow.
Figure 32. Check Winding to Ground
3. Remove retaining clip and cover.
4. Remove the three wires from the compressor
terminals.
5. Set your ohmmeter at X1 and connect the ohmme-
ter to terminals C and R to check resistance
through run windings. Refer to Figure 31 for com-
pressor terminals.
6. Set your ohmmeter at X1 and connect the ohmme-
ter to terminals C and S to check resistance
through the start windings.
Figure 30. Removing Compressor Terminal Cover
Volt Ohm
Meter Leads
Ë Ë Ë Ë Ë
Ë Ë
Ë Ë Ë
Volt Ohm
Meter Leads
Ç Ç
Ç Ç Ç
Å Å
Å Å
Å