Table des Matières
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Contents
1. Application
Enclosure cooling units are designed and built
to dissipate heat from enclosures, by cooling
the air inside the enclosure and protecting tem-
perature sensitive components. Enclosure
cooling units are particularly suitable for the
temperature range of +35°C to +50°C.
2. Technical data
(see table 2.1)
3. Assembly
Make the cutouts and drill the holes as shown
on the drilling template. Attach the supplied
sealing plate, or cut the supplied seal to length
and stick onto the rear of the device. Mount the
cooling unit on the enclosure.
Prior to mounting, ensure that
the site for the enclosure, and hence the
arrangement of the cooling unit, is selected
so as to ensure good ventilation;
the location is free from excessive dirt and
moisture;
the mains connection ratings, as stated on
the name plate, are available;
the ambient temperature is no higher than
+50°C;
the packaging shows no signs of damage.
Traces of oil are an indication of coolant loss
and of leakage in the unit system. Any
damage to the packaging can become the
cause of a subsequent function failure;
the enclosure is sealed on all sides.
Condensation will occur if the enclosure is
leaky;
the separation of the units from one another
and from the wall should not be less than
200 mm;
air inlet and outlet must not be obstructed on
the inside;
units should only be fitted vertically in the
specified position. Max. deviation from true
vertical: 2°;
condensate drainage is provided (see 6.2);
electrical connection and repair must be
carried out only by authorized specialist
personnel. Use only original replacement
parts!
To avoid an increase in condensation, a door
operated switch (e.g. PS 4127.000) should
be used which will switch the cooling unit
off when the enclosure door is opened.
Important: To achieve a permanent seal
between the cooling unit and the enclosure, the
mounting surface may have to be strengthened
or supported.
4. Electrical connection
The connected voltage and frequency must cor-
respond to the values stated on the name plate.
The cooling unit must be connected to the
mains via an isolating device, which ensures at
least 3 mm contact opening when switched off.
The unit must not have any additional tempera-
ture control connected before it. Line protection
should be provided by means of the pre-fuse
specified on the name plate. Observe the rele-
vant regulations during installation!
Connection should be made to the cable atta-
ched to the unit (see detailed wiring diagram).
4
5. Commencing operation
and control behaviour
Following the completion of mounting and a
waiting period of approximately 30 minutes (to
allow oil to collect in the compressor in order to
ensure lubrication and cooling) electrical connec-
tion can be made.
5.1 Control by thermostat
The cooling unit operates automatically, i.e. follow-
ing the electrical connection, the evaporator fan
will run continuously to circulate the air inside the
enclosure. This provides a uniform temperature
distribution in the enclosure. The built-in tem-
perature controller (setting the desired internal
temperature) effects automatically controlled
switch-off of the cooling unit by the value of the
fixed switching difference setting of 3 K. This is
set at the factory to +35°C.
5.1.1 Temperature setting at the controller
Fig. 5.1 Thermostat
0
Set the desired temperature.
Setting range +20°C to +50°C.
To avoid cyclic operation of the compressor, it is
imperative that the set switching difference of 3K
is not changed and does not deviate to a lower
value.
6. Technical information
The cooling unit (compression refrigeration unit)
consists of four main components: the coolant
compressor, evaporator, condenser, and the
valve, which are connected by suitable pipework.
This circuit is filled with a readily boiling
substance, the coolant. The R134 a (CH
coolant is free from chlorine. It has an ozone
destroying potential (ODP) of 0 and is therefore
environmentally friendly. A filter dryer which
is integrated in the hermetically sealed cooling
circuit, provides effective protection against
moisture, acid, dirt particles, and foreign bodies
within the cooling circuit.
6.1 Operation of the cooling unit
Fig. 6.1 Cooling circuit
Liquefier
Fan 2
Compressor
External circuit
Internal circuit
Evaporator
Valve
Fan 1
When a coolant compressor is put into operation,
the coolant vapour evaporates from the evapora-
tor. The heat required for the evaporation of the
coolant is drawn from the evaporator environ-
ment (internal circuit of the enclosure), causing it
to cool down. The heat fed to the coolant in the
evaporator is its environment (assisted by fans),
making the coolant once more liquid due to the
condensation which takes place. In the valve, the
liquid coolant is reduced to the particular eva-
porator pressure required. The cooling which
occurs due to the reduction of pressure, releases
the heat from the liquid, which evaporates part
of the coolant flow. The mixture of cold liquid and
throttle vapour is returned to the evaporator. The
cooling cycle is thus completed, the aforementio-
ned process of the heat transfer starts afresh.
6.2 Safety equipment
The coolant compressor and the fans are equip-
ped with thermal winding protection against
excess current and excess temperature.
6.3 Condensate discharge
Section A - A
A
A
Copper Tube
Ø 10 mm
SK 3372.100/SK 3372.200
A discharge hose should be connected to the
tube connector protruding from the SK 3372.100/
SK 3372.200 device, in order to drain off any con-
densation which may occur.
Connect the discharge hose to the angular con-
nector (without bending!), and route vertically
downwards to prevent condensation from accu-
mulating and overflowing into the device interior.
Fig. 6.2 Condensate discharge
SK 3365.100/SK 3365.200/SK 3367.100/
SK 3367.200
Any condensation forming on the evaporator coil
(due to high humidity levels and low enclosure
interior temperatures) drains downwards out of
the device via a discharge tube on the evaporator
coil divider panel.
Storage temperature: The cooling units must not
be subjected to temperatures above +70°C
during storage. Transport attitude: The cooling
FC
)
units must always be transported upright. Waste
2
3
disposal: The closed cooling circuit contains cool-
ant and oil which must be correctly disposed of
for the protection of the environment. The disposal
can be carried out at Rittal-Werk.
Technical modifications reserved.
7. Maintenance
As a maintenance-free, hermetically sealed
system, the cooling circuit has been filled in the
factory with the required amount of coolant, and
tested for leaks and subjected to a function trial
run. The installed maintenance-free fans use bull
bearings, they are protected against moisture and
dust, and are fitted with a temperature monitor.
Filter
The life expectancy is at least 30,000 operating
dryer
hours. The cooling unit is thus largely mainte-
nance-free.
All that may be required from time is that the com-
Thermostat
ponents of the external air circuit are cleaned by
compressed air.
Caution: Prior to any maintenance work, the
power to the cooling unit must be disconnected.
8. Scope of supply
and guarantee
1 cooling unit, ready to connect
1 sealing plate
1 set of assembly and operating instructions
Guarantee:
This unit is covered by a 1-year guarantee from
the date of supply, subject to correct usage.
Within this period, the returned unit will be repai-
red in the factory or replaced free of charge.
The cooling unit is to be used for the cooling of
enclosures only. If it is connected or handled
improperly the manufacturer's guarantee does not
apply and in this case we are not liable for any
damage caused.
Section B - B
Section C - C
B
C
B
C
Plastic Tube
Ø int. 10 mm
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