Operation - EIP CD30 Owner's Manual

The operation of the dehumidifier 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 conditioned space slightly warmer
and dryer than when it entered the dehumidifier unit.
AIR MOVING SYSTEM:
Air is drawn in through the inlet grille at the rear of the dehumidifier (below the
handle) 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 is to run continuously whenever the power is supplied to the
dehumidifier. The fan motor used in the dehumidifier unit is induction
protected i.e. the motor is able to take stalled current without burning out the
motor windings.
DEFROST OPERATION:
Should the ambient temperature fall below 15° C the ice will form on the
evaporator coil as the air is passed over it, and in turn the efficiency of the unit
will drop. To prevent the build up of ice on the evaporator coil a timer is
incorporated to energize the hot-gas defrost valve every 55mins for a period
of 4mins. Operating the hot-gas valve causes the evaporator coil to defrost
and the water to drain down to the condensate pan and into the drainage
tube.
HIGH TEMPERATURE CUTTOUT:
The CD30 dehumidifier has been designed to work in ambient temperatures
between -5° C and +35° C. Should the temperature in the room become
excessive a thermostat within the compressor casing will open and
dehumidifying will stop, until the thermostat resets itself.
HUMIDISTAT CONTROL:
The CD30 is fitted with a control humidistat, which measures the relative
humidity of the air within the room to be conditioned. The humidistat
incorporates a pointer and scale, which can be adjusted, and set to a relative
humidity level that is acceptable to maintain the required conditions within the
room. The humidistat controls the on/off function of the dehumidifier, when
the relative humidity of the air in the room falls below the set point of the
humidistat the dehumidifier will switch off, but when the relative humidity of
the air starts to rise again and passes the set point the unit will switch on. The
humidistat is used for the on/off function as it is a cost effective method which
ensures power is only used when needed.

OPERATION

Page 5 of 16
Drawing : - TPC137
Issue : - 7
Date : - 23/11/16