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Table of Content KG 2025-24V
1. User manual 2 ...................................................................................................................
2. Legal regulations 2 ...........................................................................................................
3. Safety instructions 3 ........................................................................................................
4. Technical information 4 ...................................................................................................
5. Functional principle 4 ......................................................................................................
6. Technical data 5 ................................................................................................................
8. Mounting 6 .........................................................................................................................
9. Electrical connection 7 .....................................................................................................
10. Controller Layout Description 11 .................................................................................
11. Wiring diagram 12 ..........................................................................................................
12. Taking into operation 14 ...............................................................................................
13. Trouble shooting 15 ......................................................................................................
14. Maintenance & Cleaning 15 ..........................................................................................
15. Maintenance 15 ...............................................................................................................
16. Transport & Storage 16 .................................................................................................
17. Parts supplied 16 ............................................................................................................
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1. User manual
This instruction manual contains information and instructions to enable the user to work safely,
correctly and economically on the unit. Understanding and adhering to the manual can help one:
Avoid any dangers.
●
Reduce repair costs and stoppages.
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Extend and improve the reliability and working life of the unit.
●
PLEASE ENSURE TO USE THE RIGHT VERSION OF THE INSTRUCTION MANUAL SUITABLE FOR
YOUR UNIT.
Conditions of use
The unit is to be used exclusively for the dissipation of heat from control cabinets and enclosures in
order to protect temperature sensitive components in an industrial environment. To meet the
conditions of use, all the information and instructions in the instruction manual must be adhered to.
General danger
Indicates compulsory safety regulations which are not
covered by a specific pictogram such as one of the following.
High electric voltage
Indicates electric shock danger.
Important safety instruction
Indicates instructions for safe maintenance and operation of
the unit.
Attention
Indicates possible burns from hot components.
Attention
Indicates possible damage to the unit.
Instruction
Indicates possible danger to the environment.
2. Legal regulations
Liability
The information, data and instructions contained in this instruction manual are current at the time of
going to press. We reserve the right to make technical changes to the unit in the course of its
development. Therefore, no claims can be accepted for previously delivered units based on the
information, diagrams or descriptions contained in this manual. No liability can be accepted for
damage and production caused by:
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Disregarding the instruction manual
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Operating error
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Inappropriate work on or with the unit
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The use of non-specified spare parts and accessories
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Unauthorised modifications or changes to the unit by the user or his personnel
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The supplier is only liable for errors and omissions as outlined in the guarantee conditions contained in
the main contractual agreement. Claims for damages on any grounds are excluded.
3. Safety instructions
Upon delivery the unit is already meeting current technical standards therefore it can be safely taken
into operation. Only trained specialists are allowed to work on the unit. Unauthorised personnel must
be prohibited from working on the unit. Operating personnel must inform their superiors immediately if
any malfunction of the unit becomes apparent.
Please note that before starting to work on or with the unit, a procedure must be carried out inside the
cabinet on which the unit is to be mounted.
Before commencing work inside the cabinet, the control cabinet manufacturer's instruction must be
read with regards to:
Safety instructions.
●
Instructions on taking the cabinet out of operation.
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Instructions on the prevention of unauthorised cabinet reconnection.
●
The electric equipment meets the valid safety regulations. One can find dangerous voltages (above 50
V AC or above 100 V DC)
Behind the control cabinet doors.
●
On the power supply in the unit housing.
●
The unit has to be fused according to the type plate and the wiring diagram, and must be protected
externally from overloading and electrical faults via suitable protective devices such as ground fault
protection breakers.
Danger through incorrect work on the unit
The unit can only be installed and maintained by technical competent and
qualified personnel, using only supplied material according to the supplied
instructions.
Danger from electrical voltage
Only specialised personnel are allowed to maintain and clean the unit. The
personnel must ensure that for the duration of the maintenance and cleaning, the
unit is disconnected from the electrical supply.
Attention
Damage to the unit through the use of inappropriate cleaning materials. Please do
not use aggressive cleaning material.
Instruction
Damage to the environment through unauthorised disposal. All spare parts and
associated material must be disposed according to the environmental laws.
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4. Technical information
The cooling unit is intended to be used as a complementary accessory to larger industrial equipment,
and is used where heat needs to be dissipated from electrical control cabinets or similar enclosures in
order to protect heat sensitive components. It is not intended for household use. The unit has two
completely separate air circuits which ensure that the clean cabinet air does not come into contact
with the ambient air which may well be dirty or polluted. The cooling unit can dissipate large quantities
of heat from electrical enclosures into the ambient air and at the same time reduce the internal
temperature to below that of the ambient air. The unit works without problems in extreme ambient
conditions (e.g. dusty and oily air). The operating temperature range is between +20°C and +55°C.
Units can be ordered with an additional electrical cabinet heater. For the cooling capacities and
evironmental ratings please refer to the type plate data.
5. Functional principle
The unit functions on the principle of the compression refrigerator. The main components are:
refrigerant compressor, condenser, choke and evaporator. these four components of the refrigerant
plant are connected with each other by pipes to form a hermetically sealed system in which the
refrigerant (R134a) circulates. R134a is chlorine free and has an Ozone Destruction Potential [ODP] of
0 and a Global Warning Potential [GWP] of 1430.
1. Air intake, cabinet side 7. Radial fan, ambient side
2. Radial fan, cabinet side 8. Condenser
3. Evaporator 9. Air outlet, ambient side
4. Air outlet, cabinet side 10. Filter dryer
5. Compressor 11. Expansion valve
6. Air intake, ambient side
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6. Technical data
Order Number 20250241
Cooling capacity L35L35 120 - 480 W
Cooling capacity L35L50 max. 275 W
Compressor Speed Control rotary compressor
Refrigerant / GWP R134a / 1430
Refrigerant charge 82 g / 3 oz
High / low pressure 30 / 6 bar
440 / 88 psig
Temperature range +10°C - +55°C
Air volume flow Ambient air circuit: 315 m³/h
Cabinet air circuit: 190 m³/h
Mounting Internal / External
Housing Material Mild steel, powder coated
Dimension HxWxD 310 x 475 x 98 mm
Weight 9.2 kg
Cut out dimensions 142.5 x 440 mm
Voltage / Frequency 24 V DC
Current L35L35 max. 11.5 A
Max. current 12.4 A
Nominal power L35L35 max. 280 W
Fuse 16 A (T)
Connection Connection terminal block
IP class EN 60529 External circuit: IP 22
Internal circuit: IP 54
Approvals CE, RoHS
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8. Mounting
Mounting preparations
Several points must be checked before the unit can be mounted. These checks must be made to
ensure safety and the trouble-free operation of the unit. These checks must be carried out with
absolute thoroughness to ensure that the unit works perfectly.
Check unit for transport damages
On delivery the carton box containing the unit must be examined for signs of transport damage. Any
transport damage to the carton box could indicate that the unit itself has been damaged in transit
which in the worst case could mean that the unit will not function.
Location and space requirements
The location of the cabinet must allow for sufficient air circulation to and from the unit.
Attention!
Damage to the unit through incorrect mounting. The unit must be mounted vertically. It is therefore
also important to check, with the help of a spirit-level, that the cabinet is in a horizontal position. The
max. deviation from the vertical or horizontal is 3 degrees.
Air apertures
To provide adequate air circulation and avoid temperature layers from forming, ensure that air inlet
and air outlet are not partially or completely blocked by obstructions in the cabinet.
Sealing
To guarantee that the unit works perfectly ensure that:
the control cabinet is completely sealed to min. IP54 according to EN 60529
●
a good seal exists between the control cabinet and the unit
●
if necessary the cabinet mounting surface should be reinforced
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Danger from electrical voltage
Ensure that for the duration of the mounting operation the cabinet is disconnected from the electrical
supply. Therefore take the cabinet out of operation, following the relevant instructions, before
mounting work begins and take all precautions to prevent premature reconnection of the
cabinet. When all mounting preparations are complete the actual mounting operation can commence.
Use of mounting template (not applicable for 19" rack mounted units)
The supplied mounting template helps to mount the cabinet air conditioner quickly. Please proceed as
follows:
Take the cabinet out of operation in the prescribed manner and secure it against unauthorized
●
reactivation
Fix the mounting template in the required position on the outer surface of the cabinet
●
Drill the holes and cut the apertures in the required positions in the surface of the cabinet and
●
remove the mounting template
Stick the self-adhesive unit seals on the outer surface of the cabinet for externally mounting and on
●
the inner surface of the cabinet for half in/half out mounting of the unit
The self-adhesive seals ensure a durable seal between the unit and the cabinet.
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Mounting the unit
Only use the supplied material to mount the unit on the cabinet. Proceed as follows to secure the unit
on the cabinet:
Set the unit up on the cabinet
Screw the M6 hex. head screws together with the washers and locking washers into the M6 threaded
rivets in the unit. The resistance of the earth connection between cabinet and cooling unit must be <
0.1 Ω.
Condensation drain pipe connection
The condensation drain is in the base of the unit. The condensation drain pipe should be attached as
required e.g. in conditions of high humidity.
If a pipe is required it should be attached as follows:
Remove the plastic stopper from the condensation drain in the base of the unit
●
Attach a pipe connection to the drain outlet and fix the condensation pipe onto it
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Route the pipe to a drain or a collector
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9. Electrical connection
High electric voltage present. Installation, maintenance, cleaning and
any other work must be carried out by qualified personnel only. The
personnel must ensure that for the duration of this work the unit and
the cabinet are disconnected from the electrical supply and protected
against unauthorised/accidental reconnection.
Note: As soon as preperations are finished, mounting procedures may proceed.
Connection to the main electrical supply
The mains connection is made via a connector / terminal block. To connect the unit to the mains
proceed as follows:
Take the control cabinet out of operation in the prescribed manner.
●
See the connection details on the circuit diagram.
●
Note the connections on the connector / terminal block from the following table
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Normal (with power on) Alarm (normal with power on)
Terminal
1 + +ve supply
2 - -ve supply
3 T1 Door contact (bridged with T2)
4 T2 Door contact (bridged with T1)
5 P1 Alarm contact
6 P2 Alarm contact
7 P3 Alarm contact
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Attention
Between contact T1 & T2 there is a 12V DC potential. These connections are to be connected to a door
switch only! If no door switch is used, these contacts are to be bridged and protected from
unauthorized and/or accidental external contact. Contacts P1, P2 & P3 are potential free and require
an external power source if wired to operate external components (indicator lamps, switches...). The
load on these contacts is not to exceed 30V DC, 4 A or 120/250V AC, 4A. If wired to external
components it must be ensured that the wiring and connections are double insulated and safe against
touch and protected from unauthorized and/or accidental external contact.
Ensure that the correct polarity is maintained. The fans should have
clockwise rotation.
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KEYPAD
TB Testbutton
DC LED Door Contact (ON when door closed)
CF LED Controller Function (blinks when controller is running)
Fault warning connection
The fault warning is connected via terminals P1, P2 & P3 on the connection terminal block. The temp.
adjustment range is between 25°C (left-hand stop) and 55°C (right-hand stop). The alarm temp. is
preset at 50°C.
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To change the alarm setting:
Remove the outer cover.
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Remove the fixing screws from the PCB cover and the earth wire from inside it.
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Lift off the PCB cover
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Using a screwdriver turn the alarm temp. potentiometer on the PC-board slightly to the right (higher)
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or the left (lower)
please note that the setting for the alarm signal must be at least 5°C higher than the setting for the
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cabinet's internal temperature
Close the unit as prescribed.
●
Check that the new setting meets requirments and if not repeat the above process.
Door contact switch connection
If required the unit can be switched on or off via a door contact switch (terminal T1&T2). When
delivered the door contact terminals are bridged.
To connect the door contact switch:
Remove the bridge from terminals T1 & T2.
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Connect the door contact switch to terminals T1 & T2.
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The contact must be closed when the cabinet door is closed.
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10. Controller Layout Description
OS Optional sensor
OPS Optional powered sensor
SDP Simple display port
ITS Internal temperature sensor
AO Alarm output
UART UART
RS485 RS485
CD Compressor data
DC Door contact
IFO1 Internal fan out 1
IFO2 Internal fan out 2
AFO1 Ambient fan out 1
AFO2 Ambient fan out 2
F Fuse
PI Power in
VDC VDC
VDCF VDC fused
GND Ground
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11. Wiring diagram
HT High Temperature
TVR1 Ambient (optional)
TVR2 Pressure pipe (optional)
TVR3 Control temp (optional)
AO Alarm output
CD Compressor data
DS Door switch
F Fuse 16 A(T)
PI DC Power
M1 Internal fan
M2 Internal fan
M3 Ambient fan
M4 Ambient fan
M5 Compressor
CC Compressor controller
TS1 Comp. thermal switch (optional)
WARNING: Unit is not protected against
reversed polarity on DC source
Wire Colour
BL Blue
RD Red
WH White
BK Black
VT Violet
YE Yellow
GY Grey
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12. Taking into operation
The unit is controlled in relation to the cabinet internal temperature. A temperature sensor
continuously measures the temperature of the air which is drawn into the unit from the cabinet. The
required cabinet temperature for cooling operation can be set on the cabinet temperature software
interface. When the cabinet temperature exceeds the set point the unit will enter cooling
operation. The compressor speed is varied according to the reading taken by the sensor in such a way
to operate in the most efficient manner and to reduce the switching on and off of the compressor. This
helps to keep the temperature inside the control cabinet as constant as possible in order to reduce
temperature induced stress on the components and fluctuating temperatures. The speeds of the
ambient and internal fans are regulated for optimal performance of the unit.
When the test button is pressed the compressor and the ambient fan will run for 180 sec. regardless of
the cabinet temp. If the test button is pressed during the 180 sec. test-run, the unit will return to its
normal operational mode.
Condensation formed inside the unit is drained from the bottom of the unit.
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13. Trouble shooting
Failure Reason Troubleshooting
Unit
doesn't
start
No power supply Check the electrical connection
Cabinet temperature is lower
than set point
Wait until the set point is reached. The unit will then
start automatically. If the set point of the cabinet
temperature is too high, reduce it accordingly.
Door contact is open Close the cabinet door or bridge the door contact.
Unit
doesn't
cool
Compressor is faulty
Please get in contact with one of our service
partners.
The circuit breaker of the
compressor got activated
Check the cooling capacity. In case the
cooling capacity is too small, install the unit
at a different place or add another cooling unit.
The evaporator and / or
condenser are extremely dirty.
Evaporator and /or condenser need cleaning
Evaporator
is iced up
Not enough refrigerant due to
leaking cooling circuit
Refill refrigerant and re-seal cooling circuit.
Please contact the manufacturer.
Ambient temperature is much
lower than the stated operating
temperature range
Install the unit at a different place. The ambient
temperature must be within the stated operating
temperature range.
The control cabinet is
not sealed properly.
The control cabinet needs re-sealing.
Fan or fan capacitor on
the cold side are faulty
Replace fan and/or fan capacitor.
Too much
condensate
Cabinet door not closed Ensure that cabinet door is closed properly
The cabinet is not
sealed properly
The control cabinet needs re-sealing.
Incomplete gasket between
cooling unit and cabinet
Please check gasket
Uneven air circulation
inside the cabinet
Cabinet air intake and air
outlet are blocked
Ensure that both are unblocked and that air
can circulate
Cabinet volume too big for
this cooling unit
Check the cooling capacity. In case the cooling
capacity is too small, install the unit at a different
place or add another cooling unit.
Condenser fan
doesn't work
Fan is faulty Replace fan
Evaporator fan
doesn't work
Fan is faulty Replace fan
Note: Before you contact one of our service partners please press the test button of the
controller. Like this the fans and the evaporator are getting switched on independent of the internal
cabinet temperature. In cases of emergency you can contact us under one of the tel. numbers stated
on the last page.
14. Maintenance & Cleaning
The cooling unit is generally maintenance free and can be operated without filters in most
environments. For units with filters these should be checked, cleaned and if necessary replaced on a
regular basis. In addition the unit should have regular functional tests (approx. every 2,000 hours
depending on the grade of ambient pollution).
15. Maintenance
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Attention! Only use original replacement parts when repairing the unit. This ensures that the unit
functions perfectly and remains safe. For further information and spare part ordering please contact
us by email under service@seifertsystems.com
Radial fan replacement: The normal working life of the fan is app. 40,000 working hours under
normal conditions. Should still need to change the fan, please take note of the following:
Disconnect the unit from the mains
Remove the unit cover
●
Remove the fixing screws from the relevant fan
●
To replace the cold side fan the PC-board must also be removed
●
Disconnect the fan cable from the PC-board
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Mount a new radial fan
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Replace the 4 fan fixing screws
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Connect the fan cable to the PC-board and replace the board if necessary
●
16. Transport & Storage
Malfunction due to transport damage
On delivery the carton box containing the unit must be examined for signs of transport damage. Any
transport damage to the carton box could indicate that the unit itself has been damaged in transit
which in the worst case could mean that the unit will not function.
The unit can only be stored in locations which meet the following conditions:
temperature range: - 40°C to + 70°C
●
relative humidity (at 25°C): max. 95 %
●
Returning the unit
To avoid transport damage the unit should be returned in the original packing or in a packing case and
must be strapped to a pallet. If the unit cannot be returned in the original packing please ensure that:
A space of at least 30 mm. must be maintained at all points between the unit and the external
●
packing.
The unit must be firmly fixed in the packing.
●
The unit must be protected by shock resistant padding (hard foam corner pieces, strips or cardboard
corner pieces).
17. Parts supplied
1 x Control cabinet air conditioner
1 x Instruction Manual
1 x CE Declaration of Conformity
4 x Lock Nut M6 DIN 985 A2
4 x Washer A6.4 DIN 125 A2
4 x Slotted Studs M6 * 25
1 x Drain pipe
1 x Connector
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