Traulsen TU044HT, TU044LT, TU072HT, TU100HT IV. Operation, IV. a Refrigerators, IV. b Freezers

IV. OPERATION V. CARE & MAINTENANCE

IV. a - REFRIGERATORS:

Both refrigerators and Freezers do not require manual defrosting. During normal operation, a refrigerator con- tinuously circulates above freezing cabinet air through the coil. A compressor “OFF” cycle occurs every 2 1/2 Hours for 20 minutes to melt any frost which may accumulate on the coil during the compressor “ON” cycle. The control will read “dEF” and the green water drop will be illumi- nated. With standard holding refrigerators, high relative humidity is also maintained to prevent dehydration of stored product.

IV. b - FREEZERS (continued):

During freezer defrost operation, heat is confined to the coil enclosure to prevent any significant rise in tempera- ture within the food zone. The fan delay control function upon termination of a defrost cycle is two-fold. First, to prevent blowing warm air into the food storage area. Second, to prevent any condensation on the defrost coil from being blown into the food storage area.

The microprocessor control is set from the factory to termi- nated defrost at 20 minutes in the event of sensor failure. This setting should never be tampered with, without first

consulting Traulsen’s Technical Service department.

°F °C SET

IV. b - FREEZERS:

During normal operation, a freezer continuously circu- lates below freezing cabinet air through the coil. The coil requires a periodic defrosting for proper operation. This is accomplished by an automatic, time activated, temperature/time terminated, defrost program, utilizing hot gas from the refrigeration system. The controller is preset at the factory for six equally spaced defrost cycles within each 24-hour period.

At the start of a freezer defrost cycle, the compressor, condenser fan and evaporator fan shut off. The hot gas relay will be energized, this will energize the hot gas solenoid valve thru the normally open contacts and the condenser fan circuit will be de-energized thru the (nor- mally closed contacts), and the compressor will restart. When the evaporator coil sensor reaches 400 F the coil is fully defrosted or if the maximum time of defrost dura- tion (20 minutes) is reached (which ever comes first) then the defrost hot gas relay is de-energized. The condenser fan restarts and the hot gas solenoid valve closes, The compressor system returns to the cooling mode. Total refrigeration system operation is then resumed (green snowflake icon goes out) and the display will show def for an additional 10 minutes then return to reading the inside cabinet temperature. The evaporator fan(s) are delayed from starting at the termination of the defrost cycle and will automatically resume by time or temp delay (5 minutes or 300 F coil sensor temperature, whichever comes first ).

V. a - CLEANING THE CONDENSER/FILTER:

The most important thing you can do to insure a long, reliable service life for your Traulsen is to regularly clean the condenser coil and or filter if provided.

The microprocessor control will notify you through a “CLN-FIL” message when the condensing temperature of the refrigerator reaches 140 degrees F or greater. If the condensing temperature reaches 160 degrees F the com- pressor will automatically turn off . When the temperature drops below 140 degrees F the compressor will restart and when the temperature drops below 120 degrees F the alarm will reset.

WARNING: DISCONNECT  ELECTRICAL POWER SUPPLY BEFORE CLEANING ANY PARTS OF THE UNIT.

To clean the condenser/filter, first disconnect electrical power to the cabinet and remove the front louver as- sembly. To do so, place hands under the louver panel and pull out and up to get louver panel off bracket of the unit. See diagram below.

Proceed to vacuum or brush any dirt, lint or dust from the finned condenser coil/filter, the compressor and other cooling system parts. If significant dirt is clogging the con- denser fins or filter, use compressed air to blow this clear. To replace the louver assembly reverse the process.

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