Stoelting E157, Service Manual

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24
CAUTION
AIR RESTRICTIONS WILL LOWER THE CAPAC-
ITY OF THE SYSTEM AND DAMAGE THE COM-
PRESSOR.
The condenser must be kept free of dirt and grease. The
freezer MUST have a minimum of 6" (15.2 cm) of ventilation
at all louvered panels for free flow of air. Make sure the
freezer is not pulling over 100°F (37°C) air from other
equipment in the area.
NOTE
Slush Freezers can not operate at temperatures over
120°F ambient.
The optional condenser filter and condenser require peri-
odic cleaning. To clean, refer to the following procedures:
1. Remove the condenser filter from the lower front panel
and visually inspect for dirt. If the filter is dirty, shake or
brush excess dirt off the filter and wash in warm soapy
water. Once the filter is clean, rinse thoroughly in warm,
clean water and shake excess water out taking care not
to damage the filter in any way. Install the filter back
onto the front panel.
2. For Model E257, remove the sani-tray and insert.
Remove the two phillips head screws from the lower
front panel and pull panel down and out.
3. Visually inspect the condenser for dirt by shining a light
through the coil from the back of the condenser (Fig.
33.)
6. An alternative method of cleaning the condenser is to
use a condenser brush and vacuum.
NOTE
If the condenser is not kept clean, loss of refrigeration
efficiency will result, causing extended run time or inad-
equate product consistency.
7. For the Model E157, remove the phillips head screws
from the back panel and remove the panel. Clean the
condenser following steps 4 - 6 above.
PRODUCT CYLINDER (EVAPORATOR)
An automatic expansion valve (A.X.V.) is used to control
the refrigerant flow to the freezing area of the product
cylinder. The adjustable A.X.V. is preset at the factory. If
the product is too thick or too thin, an A.X.V. adjustment
may be necessary.
A. A.X.V. Adjustment
To adjust the A.X.V., refer to the following procedures:
1. Remove the two philips head screws from the back side
panel and pull panel down and out (Model E257).
Remove the left side and back panel (Model E157).
2. Remove the cap from the Schrader valve on the com-
pressor (Fig. 34).
3. Install a 0-100 P.S.I.G. gauge onto the Schrader valve
(Fig. 35).
Figure 33. Check Condenser
4. If the condenser is dirty, place a damp towel over the
condenser.
5. Using compressed air or CO
2
tank, blow out the dirt
from the back of the condenser. Most of the dirt will cling
to the wet towel.
Figure 34. Remove Cap
4. Start the refrigeration cycle and read the pressure
NOTE
Freezer must be full of product and past initial freeze
down.
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Cap