Traulsen RET232EUT-HHS VII. General USE, Operation & Service Summary, VI. a INTRODUCTION/OVERVIEW

VII. GENERAL USE, OPERATION & SERVICE SUMMARY

VI. a - INTRODUCTION/OVERVIEW:

The Traulsen Even Thaw is designed to be used as a thawing cabinet. While it may be utilized in a refrigeration mode, that is not its intended use. Its function is to hold the cabinet temperature in the range from 38 to 40 degrees to thaw product within the food-safe temperature zone. It has not been configured to hold colder product temperatures in the 35 to 38 deg F range as desired by some customers.

Frozen product placed into the unit will pull the cabinet temperature below the heater set point (37 deg.) and the unit will begin to function in the thaw mode. This prompts the refrigeration system to turn OFF, and the heaters to turn ON. The fans remain ON, circulating this cold air around the product, allowing for rapid thawing. When cabinet air temperature reaches the upper set point (38 deg. although the product is actually much colder), the heaters turn OFF.

As the cabinet temperature reaches the heater set point, the heat will be cycled off while the internally generated heat from the circulation fans continues to add heat to the cabinet. If sufficient cold capacity or possibly other frozen product is added to the unit and subsequently lowers the cabinet temperature more than 1 degree below the heater set point, the heat will again turn on to thaw the product.

If the cold capacity of the product no longer sufficiently pulls down the cabinet temperature below the heater set point, the cabinet temperature will slowly rise to attain the evaporator coil cut-in set point (41 deg.) and energize the refrigeration system. The unit will remain in the refrigeration mode until the cabinet temperature pulls down to the compressor cut-out set point (38 deg.). The unit will continue to operate and cycle in the refrigeration mode.

The units incorporate a mode switch located behind the louvered panel. Switching to the Refrigeration mode (switch OFF) will turn off two internal blower fans and will reduce the Thaw mode (switch ON) performance. Subsequently, switching to the Thaw mode will have reduced refrigeration performance.

The controller has been preset at the factory and should not require any adjustments. Traulsen engineering EXPECTS no changes be made to any set points or parameter settings without discussing the situation and obtaining approval to do so. Modifying the default set points could disrupt the operation/ functional programming algorithm and result in erratic unit operation.

VI. b - LOADING GUIDELINES:

The Even-Thaw model can accommodate any size partial load, or up to (28) 18” x 26” pans of product (for example approximately 672 lbs. of chicken). Use of alu- minum pans is highly recommended. Product should be placed on pans in one layer only to allow for proper air- flow. With a full load thaw time will be between 22 & 24 hours. Overloading and/or double wrapping product will extend thaw times.

VI. c - LED LIGHTS:

The controller has two LED lights that can be useful. One is marked H, which will be lit when in the Refrigeration mode. The other is marked G and will be lit during the Thaw mode. When the H LED is lit the controller will supply line voltage to the compressor relay coil closing the N/O contacts in turn supplying line voltage to the condensing unit. When the G LED is lit the controller will supply between 3 to 30 VDC to the solid-state relay coil closing the N/O contacts in turn supplying line voltage to the mullion heater.

VI. d - CALL SERVICE LIGHT:

If lit, this indicates that one of the two temperature sensors is either OPEN or SHORTED. To check the resistance value per given temperature is correct place the sensor in an ice bath (32 deg.). The resistance value should be 100 ohms + 2%. There is a cabinet sensor inside the heater/blower chamber and another sensor in the evaporator coil.

-6-