Follett EREF Series Installation, Operation And Service Manual - Page 9
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7. Every failure of the data logger's 12V DC power supply is shown by the empty line in columns where the data
is typically recorded. The temperature probe error is recorder as +ERR (probe wires disconnected) or
–ERR (short circuit).
EREF Operation ––––––––––––––––––––––––––––––––––––––––––––––––––
The temperature control board 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°C above the controller set point, the probe signals the controller to
turn the refrigeration system on. The normally open controller contacts close and energize the evaporator and condenser
fan motors and compressor. 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 contacts reopen, which de-energizes the evaporator and condenser fan motors and the compressor.
Any accumulated frost on the evaporator coils melts during the off cycle. The condensate drains to a stainless steel
condensate tray mounted next to the condensing unit. The heat from the condensing unit evaporates any condensate in the
condensate tray.
Temperature Control
The temperature control system is preset by the factory to maintain a cabinet temperature of 4 C – 6 C. If desired, the cut-out
temperature can be raised as high as 8 C by following the instructions in Controller Operation 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
EREF Series undercounter refrigerators do not require manual defrosting. The unit cooler defrosts automatically when the
condensing unit is in the OFF cycle.
EREF Refrigerator
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