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Trotec TTR 5000 Manual

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B - 7 Operating manual dehumidifier TTR 5000
G
G
Operating manual dehumidifier TTR 5000 B - 8
B - 8 Operating manual dehumidifier TTR 5000
G
08. Care and maintenance
CAUTION!
THE DEHUMIDIFIER IS TO BE SWITCHED OFF BEFORE
COMMENCING WITH MAINTENANCE WORK OR INSPEC-
TIONS AND IT MUST BE ENSURED THAT NO UNAUTHO-
RISED SWITCHING ON OF THE APPLIANCE CAN TAKE
PLACE, EITHER LOCALLY OR FROM THE CONTROL ROOM.
All service doors are provided with cabinet bolts, which can be opened
with appropriate tools.
There are several safety rules that must always be obeyed when ser-
vicing the dehumidifier:
1. The technician must be electrically insulated from the appliance
using insulating boards, rubber mats or the like.
2. All electrical parts must be disconnected from the mains before
working on the appliance.
The length of the maintenance intervals depends on the cleanliness of
the environment as well as on the actual duration of operation of the
dehumidifier. Above all, it should be borne in mind that the fans are de-
signed to pump a certain quantity of air with a certain pressure, and that
everything that changes the operating point of the fan, e.g. clogged fil-
ters, dirty heat exchangers or the like, limits the efficiency of the dehumi-
difier, because the actual conditions deviate from the design conditions.
Rotor (drying wheel)
A dirty rotor can be cleaned by the customer. The prerequisite is strict
adherence to the described procedure. If this is not adhered to, there
is a danger of mechanical damage to the rotor and, hence, a reduction
of the sorption capacity.
Cleaning of the rotor
The rotor installed in the Trotec dehumidifiers has an advantage over
other rotors in that dust and dirt can be washed out without loss of
sorption capacity. Re-impregnation is not necessary.
The washing procedure, as described below, is not intended to be part
of normal maintenance. It is recommended to have this work carried
out by Trotec service or in any case to inform a Trotec service office
before cleaning. Never use a strongly alkaline cleaning agent, since
this can destroy the rotor.
Removing the rotor
1. Switch off the heater and let the dehumidifier run for approx. 30
minutes without regeneration.
2. Switch off the dehumidifier and secure it against being switched on
again.
3. Remove the rotor drive from the wheel compartment. If necessary in
order to do this, disconnect the electrical supply cable to the motor
in the motor terminal box and insulate it electrically until reconnec-
tion.
4. Push back the radial sealing strips.
5. Push a timber plank or similar under the rotor to support it in order
to avoid sagging when the rotor axle is removed.
6. Loosen the rotor axle at the bearing. ‘Caution: danger of the rotor
sagging’.
7. Carefully ‘remove’ the rotor from the compartment.
CAUTION
- danger of damaging the rotor surface and the circumferential
seals
- secure the rotor against inadvertently rolling out; never set the rotor
down with a jolt
- see separate instructions
8. Bathe the rotor for approx. 30 minutes in water containing a weakly
acidic cleaning agent or in toluene.
9. Rinse out the rotor with fresh water under light pressure.
10. Allow the liquid to run out of the rotor and blow the structure of the
rotor free using compressed air at a low pressure.
11. Carefully install the rotor together with the drive.
12. Make sure that all seals are seated correctly.
13. Start up the dehumidifier and measure the performance after ap-
prox. 30 minutes.
Rotor bearing
The rotor is supported by means of a plain or ball bearing on a stain-
less steel axle, which is bolted in the centre of the housing at both
ends. The plain bearings are maintenance-free and it must be checked
once per year that they are seated firmly.
Electric motors
The electric motors are equipped with ball bearings. According to the
motor manufacturer, the grease packing of these bearings is sufficient
for approximately 20,000 hours of operation, after which they should
be renewed. The electric motors are to be checked once per year for
running noises and replaced if necessary.
Air filters
The frequency with which the filters have to be cleaned or replaced
is difficult to determine, because it largely depends on the filter and
on the contamination of the air. In any case a monthly inspection is
recommended. After start-up it can be assumed that the filters will
clog up fairly quickly, because there is still dust in the ducts. The filter
elements can be equipped with a differential pressure indicator, so that
the contamination of the filters can be monitored as a function of the
increase of the pressure loss. Pocket filters must be replaced when the
permissible pressure loss limit value is reached.
Our recommendation:
The filters should be replaced when the pressure loss has increased by
150 Pa compared to the value of a new filter.
… 19 …


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