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2. Technical data
13.1 Mounting of roof-mounted units
5. Commencing operation and control
behaviour
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 cool-
ing units are particularly suitable for the
temperature range of + 40 °C to + 55 °C.
(see table 2.1)
3. Mounting of
wall-mounted units
The wall-mounted unit can be mounted either
internally or partially internally. Make cutouts
and drill holes at the mounting position (see
fig. 3.1). Cut the enclosed seal to the required
length and attach it to the unit (see fig. 3.2). In
the case of external mounting screw set-screws
M8 x 45 into the blind nuts at the rear face of
the unit and fix them by means of washers A 8.4
and nuts M8. In the case of partially internal
mounting the unit has to be divided by removing
the louvred grille and unscrewing the nuts M8.
For external, partially internal and internal
mounting see fig. 3.2.
Safety advice:
1. In order to prevent the enclosure from tip-
ping due to the mounted cooling unit fix the
enclosure to the floor with bolts.
2. For easy opening and closing of the
enclosure door use a right-up roller.
3. The enclosure with mounted cooling unit
may only be transported/moved if an
additional transport safety device for support
of the cooling unit is available.
In case a cooling unit is mounted to the door
and a Ergoform-S locking system is used, note
the rotating angle of the handle (if necessary
convert Ergoform handle).
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 cut-out for air extraction is located in the
upper area of the enclosure;
the mains connection ratings, as stated on
the name plate, are available;
the ambient temperature is no higher than
+ 55 °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. Conden-
sation 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;
6
units should only be fitted vertically in the
specified position. Max. deviation from true
vertical: 2°;
condensate drainage is provided
(see 6.2 resp. 6.3);
electrical connection and repair are 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 (see 5.2.3.3).
3.1 Mounting of roof-mounted units
Fig. 3.3 Roof plate stiffening
SK 3299. . . . / 3261. . . .
For roof-mounting
Stick the enclosed sealing gasket onto the enclo-
sure roof.
Important: To achieve a permanent seal
between the cooling unit and the enclosure, the
mounting surface may have to be strengthened or
supported (see example on PS 4206.000,
fig. 3.2). Observe assembly instructions under
par. 3.
75
375
Accessories for roof plate stiffening on the PS:
Mounting rail
"U" nut
Fixing bracket
Threaded block
Fix unit from the bottom to the mounting place
by using 6 washers A 8.4 and hexagon screws
M8 x 25.
4. Electrical connection
The connected voltage and frequency must corre-
spond 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 temperature control con-
nected before it. Line protection should be provid-
ed by means of the pre-fuse specified on the
name plate. Observe the relevant regulations
during installation!
Connect the mains connection to the plug-in
terminal strip X 10, see page 35.
Door limit switch, see 5.2.3.3
Collective fault signal connection, see 5.2.3.1
Note the designations on the terminal strip
(see wiring diagram).
The unit must be disconnected prior to
checking the protective earth conductor, high
voltage and the insulation in the enclosure.
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 con-
nection can be made.
5.1 Control by thermostat
Version . . . . .140
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 tempera-
ture controller (setting the desired internal tem-
perature) effects automatically controlled switch-
off of the cooling unit by the value of the fixed
switching difference setting of 5 K. This is set at
the factory to + 35°C.
5.1.1 Temperature setting at the controller
Fig. 5.1 Thermostat
20
30
40
50
60
°C
1. Remove the setting knob after slackening the
screw.
2. Remove locking plate.
3. Replace the setting knob and set the desired
temperature. Setting range + 20°C to + 55°C.
4. Replace the locking plate and fix the setting
knob by tightening the screw.
5.2 Control by microcontroller
Version . . . . .500
Fig. 5.2 Microcontroller
H1
H2
H4
°C
TEST
ENTER
°F
H1 = Display Terminal
H2 = LED °C
H3 = LED °F
H3
H4 = LED ENTER
H5 = LED
After electrical connection the internal fan turns on
and circulates the enclosure air. This helps assure
even temperature distribution within the enclosure.
The condensor fan and compressor are controlled
by the microcontroller. The minimum run time is
90 seconds. The switching difference is 5 - 10 K
and is set at the factory. In order to maximize
energy efficiency the thermostat should be set to
the highest enclosure temperature as allowed by
the electronics.
°C
25
10
35
8
45
6
55
4
3
°C
H5
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