Commissioning - Dehutech 450 Technical Manual

Commissioning

On initial start up, the following steps should be
taken in this order:
1. Ensure that the external isolation switch is
isolating the unit from the mains, or that the
power plug is disconnected.
2. Select the OFF position on the main switch
(orange) at the front of the dehumidifier.
3. Open the service panel on the top of the dehu-
midifier and ensure no foreign objects are left
inside the unit or in the electrical compart-
ment
4. Check air filters are installed.
5. Rotate the fan impellers by hand and make
sure they can move freely.
6. Ensure that the dry and wet air dampers are
open, and that ducts are clean and free of
blockages.
7. Ensure that the mains supply fuse is suitably
rated and that the fuse is of a slow kind.
8. Connect the dehumidifier to the main electri-
cal supply by turning the isolation switch to
ON, or alternatively connect the power plug
to the socket.
Subject to change without notice
9. Select the MAN position on the operation
switch (black) of the dehumidifier. Switch
the main switch (orange) to the ON posi-
tion for 3-4 seconds. Check that the rotor is
slowly rotating, the fans are starting, and that
the orange lamp in the main switch lights up.
Turn OFF the dehumidifier.
10. Mount the service panel and ensure it seals
properly to the casing.
11. The dehumidifier is now ready for operation.
12. Start the dehumidifier and check that the unit
is operating at the correct air volumes. An
indication of correct operation is if the ampere
meter on the front of the dehumidifier indi-
cates approximately 14-14.5 A.
13. From the factory the dehumidifier is electri-
cally wired in such a way that when operat-
ing in AUTO mode, the controls operate the
complete unit to start or stop. By shifting one
terminal connection in the electrical panel the
operation mode can be altered to operate the
process air fan continuously. The controls will
then only operate the heater on /off, depend-
ing on the signal from the humidistat or other
external signal.
See the electrical wiring diagram on page 16.
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DehuTech 450