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low 30 °C.
9.1 Electronic thermostat
9.1.1 Setting the set point
The cooling unit is fitted with a TX050 electronic
thermostat. See the specific manual C17000199
included with the unit for the functions of this ther-
mostat and how to program it.
Pavarini Components shall be in no way held liable
for any alterations the customer may make to the
default parameters if they have not received autho-
risation to do so.
Any modifications made by unqualified person-
nel may cause damage to the unit or interrup-
tions in its operation.
10. Maintenance
Warning! Caution! Before embarking on any
maintenance work, cut the current to the enclo-
sure.
Job
Check the external air heat exchang-
er and clean if necessary.
Check effectiveness of the conden-
sate discharge.
Check the fans for any overheating or
excessive vibrations.
The cooling unit is the low maintenance type, so no
filter change is required. The only maintenance re-
quired is for the internal components, which should
be checked regularly, as indicated in the table given
in this section, and cleaned with compressed air at
a maximum pressure of 4 bar (figure F.11).
An intake filter may be fitted for use in particularly
12. Troubleshooting
Malfunction
Conditions
It fails to cool
The internal fan works, the external fan and com-
pressor do not work.
No component works
Compressor, external and internal fan work
Compressor and external fan work, internal fan
does not work
External and internal fan work, compressor does
not work
It is not cooling enough
External and internal fans work, compressor works
all the time
Inside fan works, external fan and compressor
work irregularly
External and internal fans work, compressor works
irregularly
Too much condensate forming
Enclosure door open
Enclosure door closed
dirty environments. The filter is an optional extra
which is not supplied as standard (figure F.13).
Any repairs that may need doing must only be per-
formed by specialised and authorised personnel.
11. Technical information
11.1 Operating principle
The cooling unit for electrical switchboard enclosu-
res works on the basis of a refrigeration circuit con-
sisting of four main components: compressor, eva-
porator, condenser and expansion device (figure
F.12). The circuit is hermetically sealed and the re-
frigerant circulates inside it. The refrigerant used is
R134a, chlorine free and harmless for the ozone la-
yer. The unit is divided into two hermetically sepa-
rated sections where the ambient air and enclosu-
re air do not come into contact with one another and
are treated separately. The compressor (CP) com-
presses the refrigerant, taking it to a high pressure
and high temperature. The compressor then pushes
the refrigerant through a heat-exchanger coil, called
Frequency
the condenser (C), where it is cooled by ambient ai-
Every 3
r, thus passing from the gas to the liquid state. In
months
the liquid state it then passes through the expansion
Every 3
valve (EXP), vaporising at the outlet as it is now at a
months
much lower pressure. It is then received by the he-
Every 6
at exchanger coil, called the evaporator (E), by me-
months
ans of which it absorbs heat from the enclosure air
and passes from a liquid state to gas. The enclosu-
re is cooled down in this manner. The gaseous refri-
gerant is then drawn back into the compressor and
this cycle is repeated.
11.2 Safety devices.
The refrigeration circuit is fitted with a high-pres-
Causes
The temperature inside the enclosure is lower than what
is set on the adjustment thermostat.
The adjustment (or antifreeze) thermostat has failed
No electricity getting to the unit.
Cooling unit empty of fluid
Compressor mechanical failure
Internal fan capacitor failed
Internal fan failed
Compressor's amperometric protector failed (external to
the compressor, where present)
Relay or PTC for compressor starting failed
Capacitor for compressor starting failed (where present)
Compressor motor electrical failure
High pressure safety switch failed
Compressor contactor failed (where present)
Cooling unit under sized for the heat dissipated inside
the enclosure
Antifreeze thermostat triggered (where present)
Insufficient gas in the cooling unit
Thermostat set point incorrect
High pressure safety switch triggered:
•
Ambient temperature over the maximum work-
ing limit
•
Heat exchanger coil (condenser) either dirty or
clogged
Thermal protector inside the compressor triggered:
•
Ambient temperature over the maximum work-
ing limit
•
Heat exchanger coil (condenser) either dirty or
clogged
Too much ambient air inside the enclosure
Enclosure protection level is below IP54
The enclosure/cooling unit connecting seal has been fit-
ted incorrectly
sure safety switch P (figure F.12) set to the maxi-
mum working pressure of the cooling unit. If this th-
reshold is exceeded, the pressure switch stops the
compressor working. It resets automatically. The
fans and compressor have an (internal or external)
thermal cut-out switch that stops them in the case
of overheating.
11.3 Disposal
Caution! The cooling unit contains R134a refri-
gerant and small quantities of lubricating oil.
These are polluting substances and must not be
dumped. Replacement, repairs and final disposal
must be performed by experts.
At the end of the unit's life cycle/production, the fol-
lowing steps must be taken:
- Drain off the refrigerant contained in the cooling
system
- Drain off the oil contained in the compressor. The-
se two operations must be performed by speciali-
sed personnel using dedicated equipment for reco-
very of oils and gases so that they are not dispersed
into the environment.
- Disassemble and divide the internal components
in order to separate recyclable materials (steel, cop-
per, aluminium, plastic etc.). In any case, applicable
legislation in the country in which the product is u-
sed must always be followed.
NOTE
Keep the unit's documentation in a safe, dry place.
Remedy
This is not a malfunction of the cooling unit.
To verify functioning when testing, lower the thermostat setting until
the compressor and external fan start working and then reset the
thermostat.
Change the adjustment (or antifreeze) thermostat
This is not a malfunction of the cooling unit.
Make sure the power cable has been connected well to the
•
terminals.
Check that the cubicle doors and switches are closed
•
Call a refrigeration expert or the Manufacturer's Technical Assis-
tance Service
Call a refrigeration expert or the Manufacturer's Technical Assis-
tance Service
Change the internal fan's capacitor
Change the internal fan
Change the amperometric protector
Change the relay or PTC for compressor starting
Change the capacitor for compressor starting
Call a refrigeration expert or the Manufacturer's Technical Assis-
tance Service
Call a refrigeration expert or the Manufacturer's Technical Assis-
tance Service
Change the contactor
Change the cooling unit with another of greater capacity
Clean the evaporator coil
•
See if there are any obstacles inside the enclosure to hinder the
•
flow of recycling air
Call a refrigeration expert or the Manufacturer's Technical Assis-
tance Service
Check thermostat setpoint
Ventilate the premises where the enclosure is installed to keep
•
ambient temperature lower.
Clean the exchanger with compressed air and detergent
•
•
Ventilate the premises where the enclosure is installed to keep
ambient temperature lower.
Clean the coil with compressed air and detergent
•
This is not a malfunction of the cooling unit. Close the enclosure
door or disable the cooling unit
This is not a malfunction of the cooling unit. Seal enclosure open-
ings, e.g. for passage and upward path of wires
Check seal and remedy
7
ENG
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