Air Moving System; Defrost Operation - EIP Ebac PP6 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 motor is to run continuously whenever 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:

If the ambient temperature of the room in which the dehumidifier unit is
conditioning falls below 15ºC ice will form on the evaporator coil as the air is
passed over it, after a time this build up of ice on the evaporator coil will effect
the efficiency of the unit, on its ability to maintain the required set conditions
for the room.
The PP6 is therefore fitted with a defrost control device. This defrost control
device is timed to operate every 55mins, at which time, for approximately
4mins the high pressure gas is diverted by means of a by-pass valve to enter
the evaporator coil. The effect of this high pressure gas entering the
evaporator coil is to melt any build up of ice on this coil. The melted ice is
collected and disposed of by means of the condensate tube.
HIGH TEMPERATURE CUTTOUT:
The PP6 dehumidifier has been designed to work in ambient conditions of 0ºC
to +50ºC. 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.
OPERATION
Page 5 of 12
Drawing : - TPC148
Issue : - 4
Date : - 24/11/16