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Resumen del manual
The controller is pre-programmed with a -25 C (-13 F) set point which provides a compressor cut-in at -23 C (-9 F) and cut-out at -25 C (-13 F). The controller set point can be raised to -15 C (+5 F) for nourishment applications where a lower temperature is not desired (i.e. ice cream). Follow instructions for changing temperature °C - 25 evaporator fan energized defrost refrigeration system energized cut-out below. All set points have a 2 C differential. The 2 C differential means that with a -25 C set point, for example, the compressor will turn off at -25 C (-13 F) and turn on when it reaches -23 C (-9 F). To display temperature cut-out STEP INPUT DISPLAY 1 Press and release SET Current cut-out temperature will display for approximately 5 seconds. Display will return to current refrigerator temperature. To change temperature cut-out STEP INPUT DISPLAY 1 Press and hold SET for Current cut-out temperature displayed and °C (°F) will fl ash 3 seconds 2 Press UP or DOWN arrows to New cut-out temperature displayed desired cut-out temperature 3 Press and release SET New cut-out temperature blinks three times, then current refrigerator temperature will display To change temperature display from degrees C to degrees F Follett includes a programming key (part# 00193375) that changes the display and temperature settings from degrees C to degrees F. Programming freezer from a degree F key (download) 1. TURN OFF freezer. 2. Remove 6 screws from panel holding controller to access back of controller. 3. Insert degree F programmed key into 5 PIN receptacle on controller back. 4. TURN ON freezer. 5. Values from key automatically download to freezer (“dol” message blinks followed by “end”). 6. After 10 seconds display returns to current freezer temperature and controller will restart with new values. 7. TURN OFF. 8. Remove key. 9. Reinstall panel. Note: An “Err” message displays for failed programming. Turn freezer OFF then ON to restart download, or remove key to abort. 6 Controller security The controller panel can be locked to prevent inadvertent or intentional programming changes. In locked mode, the controller will display cabinet temperature and cut-out set point only. To lock the controller 1. Press the UP and DOWN ARROW buttons together for 3 seconds until “PoF” displays (will flash 3 times). 2. Programmer is now locked. To unlock the controller 1. Press UP and DOWN ARROW buttons together for 3 seconds until “Pon” displays (will flash 3 times). 2. Programmer is now unlocked. Controller programming key degrees C (optional accessory) A controller programming key is available from Follett to provide fast and easy reprogramming of factory settings in degrees C (part# 00193383). 7 Operation The temperature controller and probe indicate when the refrigeration system is required to turn on and off. The refrigeration system removes heat from the cabinet interior and rejects it to the surrounding room air. When the cabinet interior temperature reaches +2.2 C (+4 F) above the controller set point, the probe signals the controller to turn the refrigeration system on. The normally-open controller contacts 4 and 5 close and energize the evaporator and condenser fan motors, compressor and door heater. The snowflake and fan LED's on the controller will come on to indicate the refrigeration system is on. The compressor uses a current-style starting relay and a starting capacitor to start the compressor motor. When the cabinet interior temperature falls to the set point, the probe signals the controller to turn the refrigeration system off. The controller contact 5 reopens, which de-energizes the condenser fan motor and the compressor. The snowflake LED will go out and the fan LED will remain on. Any accumulated frost on the evaporator coils melts during the defrost cycle. Freezer products will remain at or below -15 C (-5 F) during the defrost cycle. The condensate drains to a drain pan mounted along the condensing unit. The heat from the condensing unit evaporates any condensate in the drain pan. Temperature control The temperature control system is preset by the factory to maintain a cabinet temperature of -23 C (-10 F). If desired, the cut-out temperature can be raised as high as -15 C (5 F) by following the instructions on page 6 for changing the temperature set point. The 2 C cut-out differential will be maintained regardless of the controller set point. Defrosting The FZR series undercounter freezers control frost accumulation on the evaporator through automatic timed defrost cycles. The defrost cycle is initiated by the temperature controller every 4 hours. Contacts 4 and 5 on the controller open and the refrigeration system is turned off. Contact 2 is closed and the defrost heater is energized. The melting snowflake LED on the controller will come on, and the temperature display will read: “dEF” to indicate the freezer is in the defrost cycle. The heater warms the evaporator coil and drain pan to melt the frost and drain ...