SECTION 4

MAINTENANCE INSTRUCTIONS

4.1FREEZERADJUSTMENT

This section is intended to provide maintenance personnel with a general understanding of the freezer adjustments. It is recommended that any adjustments in this section be made by a qualified person.

4.2PRODUCTTEMPERATUREADJUSTMENT

A potentiometer is used to control the product tempera- ture. To change the temperature of the product, follow the steps below:

A.Remove the two screws under each corner of the header display sign, then pull sign out and down.

NOTE

Removal of inside electrical box cover (if present) is not necessary when making temperature adjustments.

B.Use a screw driver to make desired adjustment. A label near the potentiometer will give complete in- structions. (See Fig. 20)

Potentiometer

Å

Figure 20. Potentiometer

4.3 DRIVE BELT TENSION ADJUSTMENT

To check belt tension, refer to Figure 21 and follow the steps below:

WARNING

Disconnect all electric power before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

WARNING

Moving belts and pulleys can crush and dismember. Do not operate machine with cabinet panels removed.

A.Remove either side panel.

B.Press firmly on one belt. (See Figure 21)

C.When the tension is properly adjusted, the outside of the depressed belt should be approximately in line

with the inside of the other belt.

Figure 21. Belt Adjustment (Model 237 Shown)

D.If an adjustment is necessary, loosen jam nut on motor adjustment plate. Then tighten or loosen ad- justing nut for proper tension and tighten jam nut. On Model 237R you must loosen the four motor plate retaining nuts.

NOTE

Belt life will be increased if new drive belts are tightened after two or three weeks of operation.

4.4CONDENSERCLEANINGAIR-COOLED FREEZERS)

CAUTION

Hearing Protection Required!

This procedure emits a loud noise. Wear proper hearing protection. Failure to wear proper hearing protection

may result in permanent hearing loss.

The condenser requires periodic cleaning. To clean the condenser, refer to the following steps:

NOTE

Some freezers have a condenser filter. To clean, remove and wash in warm soapy water. Rinse in clean water and shake dry, taking care not to damage filter in any way.

A.Visually inspect the condenser for dirt. (Remove front panel on self-contained freezers.)

B.If the condenser is dirty, place a wet towel over the front of the condenser.

C.Using compressed air or CO2 tank, blow out the dirt from the back of the condenser. Most of the dirt will cling to the wet towel.

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