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Table of Contents
1. Application
2. Technical data
3. Wall mounting
4. Safety notices
5. Electrical connection
6. Commencing operation
7. Technical information
8. Maintenance
9. Scope of supply and guarantee
1. Application
Air/air heat exchangers are designed and built to dissipate heat from
enclosures by cooling the air inside the enclosure and protecting
temperature-sensitive components. The LLWT is particularly sui-
ted for operation in surroundings with an aggressive airflow be-
cause the two separate air circulation circuits prevent it from en-
tering the inside of the enclosure. A utilisation condition here is
that the surrounding temperature must be lower than the planned
enclosure temperature.
2. Technical data
(see page 7)
3. Wall mounting
The standard wall unit can chosen for internal or external wall
mounting and the mounting level cut-outs and holes must be made.
3.1 External mounting
Cut the enclosed seals to the required length and attach to the
unit. Screw tapped pins into the blind nuts on the rear of the unit.
The unit is then to be secured using washers and nuts.
3.2 Internal mounting
First remove the lamella grid and belt. Cut the enclosed seals
to the required length and attach to the unit. Loosen the nuts and
washers, then fasten the unit to the enclosure with the washers
and nuts.
4. Safety notices
The following safety notices are to be observed in their entirety
with regard to the correct utilisation of the unit:
To prevent the enclosure with the air/air heat exchanger fitted
tipping over, it is essential that this be bolted to the floor.
A roller door is to be used to ensure problem-free opening and
closing of the enclosure door.
A transportable enclosure with built-in air/air heat exchanger
may only be produced if an additional transport anchorage to
support the heat exchanger is used.
Prior to mounting, ensure that:
The site for the enclosure, and hence the arrangement of the
air/air heat exchanger, is selected so as to ensure good venti-
lation;
The location is free from excessive dirt and moisture;
The cutout for air extraction is located in the upper area of the
enclosure;
The mains connection ratings, as stated on the rating plate, are
available;
The ambient temperature does not exceed +55°C;
The packing must not show signs of damage. Any damage to
the pakkaging may be the cause of subsequent malfunctions;
The enclosure is sealed on all sides (IP 54);
The separation of the units from one another and from the wall
should not be less than 200 mm;
Air inlet and outlet are not obstructed on the inside of the enclo-
sure;
The unit must be mounted so that it is horizontal in accordance
with the planned position;
Only authorised personnel are permitted to make the electrical
connections and repairs. Use only original replacement parts!
Montageanleitung Rittal Luft/Luft-Wärmetauscher
The heat loss from the components installed in the enclosure
must never exceed the respective power capability of the
LLWT;
The customer must not modify the air/air heat exchanger unit in
any way.
5. Electrical connection
The connected voltage and frequency must correspond to the
values stated on the rating plate.
The air/air heat exchanger must be connected to the mains via an
all-pin isolating device which ensures at least 3 mm contact ope-
ning when switched off.
Line protection should be provided by means of the fusing speci-
fied on the rating plate. Observe the relevant regulations during
installation!
6. Commencing operation
Following the completion of mounting, electrical connection can
be made.
7. Technical information
7.1 Condensation discharge
When operating the LLWT in surroundings, in which, for example,
there is oil/spray mist or high air humidity present, these can be
condensed in the unit's external circuit. You merely have to remo-
ve the plastic stopper fitted to the bottom of the enclosure in order
to drain it off.
7.2 General information
Storage temperature: The air/air heat exchangers must not be ex-
posed to temperatures above +70°C.
Disposal can be carried out at the Rittal factory.
Technical modifications reserved.
8. Maintenance
The maintenance-free fans fitted in the unit have sealed ball-bea-
rings and are therefore protected against dust and humidity. The
life expectancy is at least 30,000 operating hours. The air/air heat
exchanger is thus largely maintenance free. It is merely the lamel-
la in the heat exchanger cassette that have to be cleaned from
time-to-time. This can be done by:
a) using compressed air to blow the dry dust off of them
b) using a detergent solution (max. 75°C) to wash off any grease
or oil residue (ensure that all sides are dry before refitting!).
The heat exchanger cassette can be removed from the enclosure
for cleaning by undoing the two eccentric screws. The front plates
must have been unscrewed previously so that his can be done.
Attention!
Prior to any maintenance work, the power to the heat exchanger
unit must be disconnected.
9. Scope of supply and guarantee
1 x air/air heat exchanger ready for connection
1 x drilling template
1 x sealing tape
1 x set of mounting and operating instructions
Guarantee:
This unit is covered by a 2-year guarantee from the date of supply,
subject to correct usage (see Safety notices in Section 4 as well.).
Within this period, the returned unit will be repaired in the factory
or replaced free of charge. The air/air heat exchanger is to be
used for the cooling of enclosures only. Unauthorised utilisation or
incorrect connecting up will invalidate the manufacturer's guaran-
tee. No liability will be assumed for any damage arising from such
occasions.
Notes
GB
5
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