3
Device de
s
cription
RITTAL Compact split cooling unit assembly and operating instructions
25
EN
3
Device de
s
cription
Depending on the model chosen, your cooling unit
may vary in appearance from the illustrations con-
tained in these instructions. However, the functions
are identical in principle.
Fig. 1:
Device description
Le
g
end
1
Housing external unit
2
Louvred grille for air outlet
3
Infill panel
4
Display
5
Louvred grille for air inlet
6
Rating plate
7
Housing internal unit
8
Dispatch bag
3
.1 Functional de
s
cription
This cooling unit is designed to dissipate heat from
the security safe or to cool the safe interior air. The
evaporator of the unit is mounted inside on the side
wall; the external part is mounted outside on the side
wall or the door of the security safe.
3
.1.1 How it work
s
The cooling unit (compression refrigeration system)
is comprised of four main components (cf. Fig. 2):
The evaporator (1), the coolant compressor (2), the
condenser (3), and the control or expansion valve
(4), which are connected by suitable pipework.
The internal and external circuits are connected with
flexible coolant lines and the appropriate control
lines. This circuit is filled with a readily boiling sub-
stance, the refrigerant. Coolant R134a (CH
2
FCF
3
) is
chlorine-free.
Its ozone destruction potential is 0, making it very
eco-friendly.
A filter dryer (5) which is integrated into the hermeti-
cally sealed cooling circuit provides effective protec-
tion against moisture, acid, dirt particles, and foreign
bodies within the cooling circuit.
Fig. 2:
Cooling circuit
In the evaporator coil (1), the liquid coolant is con-
verted to a gaseous state. The energy needed for
this purpose is taken from the safe air in the form
of heat, which has the effect of cooling the safe air.
In the compressor (2), the coolant is heavily com-
pressed, so that it achieves a higher temperature
inside the condenser (3) than the ambient air. This
means that excess heat may be emitted to the ambi-
ent air via the surface of the condenser, as a result of
which the temperature of the coolant drops and it is
converted back into liquid. It is re-injected into the
evaporator coil via a thermostatic expansion valve
(4), which causes it to cool down further, and is then
once again able to absorb the energy from the safe
air in the evaporator coil. The whole cycle begins
again.
3
.1.2 Control
RITTAL compact split cooling units are fitted with a
controller for setting the functions of the cooling unit.
This is the Comfort controller (display and extended
functions, see Chapter “6 Operation”, page 32).
3
.1.
3 S
afety equipment
– In the cooling cycle, the cooling unit has a tested
pressure-operated switch to EN 12 263 which is
set to maximum PS (admissible pressure); this
operates via an automatic reset device whenever
the pressure drops again.
– Temperature monitoring prevents the evaporator
coil from icing over. If there is a risk of icing, the
compressor switches itself off and automatically
switches itself back on again at higher tempera-
tures.
– The refrigerant compressor and the fans are
equipped with thermal winding shields to protect
against excess current and excess temperatures.
8
6
3
4
1
7
2
2
5
5
PSA
H
pressure-
operated
switch
Condenser fan
Expan
s
ion valve (4)
Temperature
control
Filter dryer (5)
Internal circuit
Compre
ss
or
(2)
External circuit
Evaporator fan
Evaporator coil (1)
Conden
s
er (
3
)
