Stulz Cosmotec CVE Series, Use And Maintenance Manual

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-
Dirty exchange condenser
 Clean the condenser
-
Air short-circuiting
 Make sure that no obstructions or obstacles may cause exhaust
air short-circuiting

Check that the minimum distances from a wall, ceiling, electrical
cabinet or another air conditioner is respected as indicated in
this manual
b. Compressor thermal protector intervention
-
Air temperature in the cabinet higher than the maximum value
allowed by the rating plate of the unit
-
Same causes and remedies reported at 2.a.
3. Internal fan operates, external fan does not operate,
compressor operates intermittently
a. Faulty fan electric condenser
-
Replace the electric condenser
b. Faulty external fan
- Replace the condenser fan
DOES NOT COOL
1. None of the components operate
a. No voltage to the unit
- Make sure doors and switches are closed
2. Compressor, condenser fan and evaporator fan operate
a. Insufficient gas charge in the cooling system
-
Consult a refrigeration engineer or STULZ SpA
assistance
b. Compressor mechanical fault
-
Consult a refrigeration engineer or STULZ SpA
assistance
3. Compressor and external fan operate, internal fan does not
operate
a. Faulty fan electric condenser
-
Replace the electric condenser fan
b. Faulty evaporator fan
-
Replace the fan
4. External fan and internal fan operate, compressor does not
operate
a. Compressor thermal overload protector failure, if present
-
Replace thermal overload protector and check the efficiency of
the electrical components of the compressor
b. Faulty relay or compressor starting PTC
- Replace the relay or compressor starting PTC
c. Faulty condenser for compressor starting, if present
- Replace the starting condenser
d. Faulty compressor motor
-
Consult a refrigeration engineer or STULZ SpA
assistance
e. Faulty high pressure switch
-
Consult a refrigeration engineer or STULZ SpA
assistance
f. Faulty compressor contactor, where present
- Replace the contactor
5. External fan, internal fan and compressor operate
a. Adjusting thermostat faulty or set at a temperature higher than
the temperature in the cabinet
14. OPTIONS – ACCESSORIES
INFORMATION
Not all option and accessory are available for each model.
OPTIONS
Special colour
33
Make sure that no obstructions or obstacles may cause exhaust
Check that the minimum distances from a wall, ceiling, electrical
cabinet or another air conditioner is respected as indicated in
Air temperature in the cabinet higher than the maximum value
Internal fan operates, external fan does not operate,
fan and evaporator fan operate
STULZ SpA technical
STULZ SpA technical
ternal fan operate, internal fan does not
External fan and internal fan operate, compressor does not
protector failure, if present
Replace thermal overload protector and check the efficiency of
the electrical components of the compressor
Replace the relay or compressor starting PTC
starting, if present
STULZ SpA technical
STULZ SpA technical
External fan, internal fan and compressor operate
Adjusting thermostat faulty or set at a temperature higher than
accessory are available for each model.
As standard indoor units CVE are color RAL7035 opaque and
outdoor units CVO RAL7035 peel. With option “special color” unit
can be requested with other colour type RAL (peel or smooth).
Colour RAL9005 is available in opaque version for indoor unit.
Stainless steel casing
With this option, external casing are made of stainless steel AISI 304
or AISI 316 sheet. Units with stainless steel casing are not painted.
Stainless steel panel
With this option, panel is made of stainless steel AISI 304 or AISI 316
sheet. Panel is not painted.
Protective treatment on condenser coil
Protective treatment on surface of condenser coil to increase the
protection against corrosion. The condenser coil copper/allu
will have an epoxy surface treatment, the microchannel condenser
will have a cataphoresis surface treatment.
Version LN (fan speed regulator for condenser fan)
It reduces fan speed of condenser fan in order to reduce noise. Fan
speed is adjustable with 0-10V signal from electronic board in
according to condensation pressure. On unit CVO it replaces
differential pressure switch ON/OFF, present on standard unit.
ATTENTION!
Cooling capacity could be lower than value on identification plate
of the un
Electrical heating
This option is useful when heating of the internal air is required. The
electrical reheat is made of steel material and includes two safety
devices. It is controlled directly by electrical board.
Control phase module for three phase
Relay for control of right sequencing of phases during connection of
main power supply.
ACCESSORIES
Filter
Metal polypropylene to prevent the clogging of the condenser coil
from large particles or textile wires (no available for air condition
Inox).
Air baffle
Air deflector to force the cold air from air conditioner to the bottom
of the cabinet.
Semi or totally recessed mounting frame
Allows to reduce or eliminate air external depth of air conditioner,
in the meantime the cabinet protection
device has rubber insulation gasket,to guarantee a perfect
connection to the cabinet surface. Fixation system to cabinet is
done by screws.
Gasket IP55
Gasket in place of the standard gasket with air conditioner. It allows
an higher protection degree side cabinet than standard for entry
water. Gasket IP55 is only suitable for external installation, not for
semi-encasing frame and total-encasing frame .
Keypad
Key-pad can be connected to connector on back of the unit, to show
information about working conditions. For further information refer
to chapter “Control and working logic”. Accessory only for CVO unit.
Sequencing cable
Sequencing cable for connection between two air conditioners.
Porta seriale per MODBUS
Serial port for connection to monitoring sytem with Modbus RTU
communication protocol.
Remote probe for function SEM
2
Probe in place of the standard probe with air conditioner to carry
out
function Smart Energy Management
CVE-CVO
As standard indoor units CVE are color RAL7035 opaque and
outdoor units CVO RAL7035 peel. With option “special color” unit
can be requested with other colour type RAL (peel or smooth).
RAL9005 is available in opaque version for indoor unit.
With this option, external casing are made of stainless steel AISI 304
or AISI 316 sheet. Units with stainless steel casing are not painted.
option, panel is made of stainless steel AISI 304 or AISI 316
Protective treatment on condenser coil
Protective treatment on surface of condenser coil to increase the
protection against corrosion. The condenser coil copper/alluminium
will have an epoxy surface treatment, the microchannel condenser
will have a cataphoresis surface treatment.
Version LN (fan speed regulator for condenser fan)
It reduces fan speed of condenser fan in order to reduce noise. Fan
10V signal from electronic board in
according to condensation pressure. On unit CVO it replaces
differential pressure switch ON/OFF, present on standard unit.
ATTENTION!
Cooling capacity could be lower than value on identification plate
of the unit.
This option is useful when heating of the internal air is required. The
electrical reheat is made of steel material and includes two safety
devices. It is controlled directly by electrical board.
Control phase module for three phase compressor
Relay for control of right sequencing of phases during connection of
polypropylene to prevent the clogging of the condenser coil
from large particles or textile wires (no available for air conditioner
Air deflector to force the cold air from air conditioner to the bottom
Semi or totally recessed mounting frame
Allows to reduce or eliminate air external depth of air conditioner,
in the meantime the cabinet protection degree remains at IP54. This
device has rubber insulation gasket,to guarantee a perfect
connection to the cabinet surface. Fixation system to cabinet is
Gasket in place of the standard gasket with air conditioner. It allows
higher protection degree side cabinet than standard for entry
water. Gasket IP55 is only suitable for external installation, not for
encasing frame .
pad can be connected to connector on back of the unit, to show
nformation about working conditions. For further information refer
to chapter “Control and working logic”. Accessory only for CVO unit.
Sequencing cable for connection between two air conditioners.
connection to monitoring sytem with Modbus RTU
Probe in place of the standard probe with air conditioner to carry
out
function Smart Energy Management
2
.