Page 6 of 12
Drawing : - TPC159
Issue
: - 4
Date
: - 24/11/16
OPERATION
The LD-82 dehumidifier process dryer is a basic refrigeration drying unit. A
control system, the Universal Controller (UC-2), is required for each of the LD-
82 dehumidifier process dryers to be used in each chamber for the drying
process.
The operation of the LD-82 dehumidifier process dryer is to remove moisture
from the air by having it condense on the cold tubes of the evaporator coil.
The air then passes over the hot condenser coil and returns to the chamber
slightly warmer and dryer than when it entered the process drying unit.
AIR MOVING SYSTEM:
Air is drawn into the LD-82 dehumidifier process unit at the base of the
dehumidifier and over the two heat exchanges (evaporator/condenser coils)
under the influence of the axial fan, which is driven by the motor. The
operation of the fan motor is to run continuously whenever power is supplied
to the dehumidifier. The fan motors used in the LD-82 dehumidifier process
dryer unit are induction protected i.e. the motor is able to take stalled current
without burning out the motor windings.
HIGH TEMPERATURE CUT OUT:
The LD-82 dehumidifier process dryer unit has been designed to work in
ambient temperatures between 20ºC and 60ºC. Should the temperature in the
chamber become excessive a thermostat within the compressor casing will
open and dehumidifying will stop, until the thermostat resets itself?
HEATER ELEMENT PROTECTION DEVICE:
The LD-82 dehumidifier process dryer unit has been fitted with heater
elements. This heat is used intermittently during the drying cycle (under
controlled conditions), to provide the heat necessary to raise or maintain the
temperature of the chamber. The heater element is protected by a
temperature sensitive device. If for any reason the temperature rises above
the pre-set (70°C) safety point, the power to the unit will be switched off.
