
F-2833 - 9 - Technical Data Subject to alterations
due to heat transmission. To achieve this the duct must
slope downstream and the wet air outlet must be
placed as far as possible from the process air intakes,
to avoid losses of performance.
5.4 Electric mains connections.
Attention: The dehumidifier works with
medium electrical power and voltage and its
connection to the mains must be done by
qualified personnel and according to the
applicable local electrical regulations.
The unit must be connected to the electrical network of
the installation through a short circuiting and ground
leakage protection line, with wires section/sensitivity as
corresponds to the dehumidifier power.
5.5 Control equipment locations and
connections.
The location and mounting instruction for the control
equipment are normally specified by the corresponding
supplier.
In case of On-Off Control using a Hygrostat you can
choose between the complete unit switch off or the
reactivation air heater switch off, as described before.
6. Start up.
6.1 Unit start up.
Once the ductwork has been completed and the
equipment is connected to the electrical mains, as
well as to the control equipment, proceed in this way:
Attention: Before using the control panel,
verify that all mechanical elements can work
freely and the unit has no installation d e b r i s
inside.
»Checkthattheairflowregulationdampers,ifexist,are
opened.
»Checkthathygrostatsetpoint-ifexists-isatleast10-
15% lower than environmental humidity.
»Checkthatelectricmainsisprotectedwithafuse
adequate to the unit power.
»Switchontheunit.Integralpilotmustlight.Fanstarts
operation and the ammeter reading reaches the upper
limit due to the PTC heater consumption. PTC heater,
like motors, have a consumption peak on starting 2 or
3 times the normal consumption.
»Waitafewminutesallowingthedesiccantwheelto
rotate several times until drying and regeneration
processes are stabilized. Check that dry air
temperature is lightly higher than the process air
temperature, and the wet air temperature is higher
than the dry air temperature. Adjust air flows to
specific requirements of each application.
»Measureforeseenthermohygrometricparameters.
To reduce the u nit capacity yo u ha ve to strangl e th e
wet air stream, this automatically reduces
consumption indicated by the ammeter.
6.2 Stopping the unit.
The equipment can be stopped manually or
automatically.
Manual mode:
»Justoperatethecontrolswitchtoits"OFF"position.
Automatic mode:
»Theunitwillbeshut-offwhenjumperH2,showninthe
wiring diagram, is open (this stops the unit totally). In
case of opening jumper H1, the reactivation air heater
is shut-off while the two motors keep on running.
Installation, Operation and Maintenance Manual
Desiccant Rotor Type Air Dehumidifiers DFRB series