Stulz Cosmotec CVE Series, Use And Maintenance Manual

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First checks after start-up
Check that the air blown out to the environment flows correctly and
is not recycled, even partially
Check that the air flowing around the cabinet circulates uniformly
and that there are no obstructions.
While the unit is operating, check that the supply voltage maintains
the values indicated on the identification plate.
Check correct phase sequence of power supply on three phase
models. If compressor doesn’t work correctly could be damaged
quickly. In case the sequence is not correct, reverse the wiring.
Correct compressor operation can be checked:
- by measuring the temperature at the condenser outlet, if this
temperature is noticeably higher than the external temperature, the
compressor is working correctly.
- by measuring the temperature at the evaporator outlet, if this
temperature is noticeably lower than the intake temperature, the
compressor is working correctly
Otherwise, the compressor is turning in the wrong direction and the
phase sequence must be changed.
Check there are no alarms.
Check fans work correctly.
Check unit work in according to correct working logic.
Shutdown
No particular actions are required to shut down the unit. Disconnect
the unit from power.
The ON-OFF key on the C2020 display (if present) is only used o put
the unit on stand-by. It must not be thought
component to turn the unit off prior to performing maintenance.
10. MAINTENANCE
The reliability and full automation of the moving parts signifies
minimal ordinary maintenance, which must nevertheless be carried
out as and when required. Lack of maintenance will not only
compromise the operation and working life of the air conditioner
but will also render the warranty null and void. In order to maintain
the equipment efficiency and safety, the activities listed below must
be performed throughout the working life of the machine
ATTENTION!
Before carrying out any work on the unit, disconnect it from the
power supply.
PREVENTIVE MAINTENANCE SCHEDULE
Monthly
Check that the exchanger (condenser), the grilles (protection
fans)and filters (if present) are clean and that any dirt does not
obstruct the passage of air.
Check for the presence of unusual noises during operation.
Check the condensate drain pipe of the unit is fully operating and
free.
Six-monthly
Check that the fan motors and other components do not generate
abnormal vibrations or show signs of overheating.
For units containing more than 3 kg of coolant it is compulsory to
verify the absence of refrigerant leaks, according to European
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the environment flows correctly and
Check that the air flowing around the cabinet circulates uniformly
While the unit is operating, check that the supply voltage maintains
Check correct phase sequence of power supply on three phase
models. If compressor doesn’t work correctly could be damaged
quickly. In case the sequence is not correct, reverse the wiring.
by measuring the temperature at the condenser outlet, if this
temperature is noticeably higher than the external temperature, the
by measuring the temperature at the evaporator outlet, if this
e is noticeably lower than the intake temperature, the
Otherwise, the compressor is turning in the wrong direction and the
in according to correct working logic.
No particular actions are required to shut down the unit. Disconnect
OFF key on the C2020 display (if present) is only used o put
by. It must not be thought to be a safety
component to turn the unit off prior to performing maintenance.
The reliability and full automation of the moving parts signifies
minimal ordinary maintenance, which must nevertheless be carried
of maintenance will not only
compromise the operation and working life of the air conditioner
but will also render the warranty null and void. In order to maintain
the equipment efficiency and safety, the activities listed below must
ut the working life of the machine
Before carrying out any work on the unit, disconnect it from the
Check that the exchanger (condenser), the grilles (protection
present) are clean and that any dirt does not
Check for the presence of unusual noises during operation.
Check the condensate drain pipe of the unit is fully operating and
components do not generate
abnormal vibrations or show signs of overheating.
For units containing more than 3 kg of coolant it is compulsory to
verify the absence of refrigerant leaks, according to European
Regulation 842/2006. Checks should be marked on
register. If circuit is hermetically sealed, obligation is needed only if
on circuit are present 6 kg of gas.
NB: If the unit operates in a particularly dusty environment or if
experience dictates the need for more frequent cleaning, the un
must be cleaned.
IMPORTANT
After each ordinary and extraordinary maintenance, check the
perfect efficiency of the condensate drainage.
REPLACING COMPONENTS
It is advisable to replace the fans after 40,000 hours of operation
CLEANING THE HEAT EXCHANGER.
ATTENTION!
Before carrying out any work on the unit, disconnect it from the
power supply
ATTENTION!
Do not use caustic or acidic substances to clean any of the
exchanger components
During the cleaning operations, wear safety glasses, rubb
compatible with the detergent being used, and safety shoes.
The filter cleaning (where present) should be done after removing it
from the air conditioner. If it is decided to replace it, use only
original STULZ SpA parts.
The components inside the air conditioner, ambient side or cabinet
side, must be cleaned with unit not fitted with ground voltage, with
cleaning fluid and compressed air with pressure not exceeding 4 bar.
DOWNTIME STOPS
If the unit remains inactive for a long time, it is necess
discharge any condensate residues and make a general cleaning.
11. INFORMATION ON RESIDUAL RISKS AND EMERGENCY
SITUATIONS
This equipment has been designed limiting any possible sources of
danger or hazardous situations to the minimum possible. The
situations or sources of danger originate from improper use or non
compliance with standards governing installation and use. This
information must be made known to all personnel working on or
near to the equipment.
11.1 GENERAL SAFETY STANDARDS
All personnel inspecting, using and maintaining the equipment must
be aware of the following safety requirements:

The warning signs must be clearly visible in areas of potential
danger.

Danger areas must be covered by a visual monitoring
CVE-CVO
Regulation 842/2006. Checks should be marked on the equipment
register. If circuit is hermetically sealed, obligation is needed only if
If the unit operates in a particularly dusty environment or if
experience dictates the need for more frequent cleaning, the unit
After each ordinary and extraordinary maintenance, check the
perfect efficiency of the condensate drainage.
It is advisable to replace the fans after 40,000 hours of operation
ATTENTION!
Before carrying out any work on the unit, disconnect it from the
power supply
ATTENTION!
Do not use caustic or acidic substances to clean any of the
exchanger components
During the cleaning operations, wear safety glasses, rubber gloves
compatible with the detergent being used, and safety shoes.
The filter cleaning (where present) should be done after removing it
from the air conditioner. If it is decided to replace it, use only
he air conditioner, ambient side or cabinet
side, must be cleaned with unit not fitted with ground voltage, with
cleaning fluid and compressed air with pressure not exceeding 4 bar.
If the unit remains inactive for a long time, it is necessary to
discharge any condensate residues and make a general cleaning.
11. INFORMATION ON RESIDUAL RISKS AND EMERGENCY
This equipment has been designed limiting any possible sources of
danger or hazardous situations to the minimum possible. These
situations or sources of danger originate from improper use or non-
compliance with standards governing installation and use. This
information must be made known to all personnel working on or
11.1 GENERAL SAFETY STANDARDS
sonnel inspecting, using and maintaining the equipment must
be aware of the following safety requirements:
The warning signs must be clearly visible in areas of potential
Danger areas must be covered by a visual monitoring system.