Seifert KG 2025-48V User manual

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Table of Content 20250481
1. User manual 2 ..................................................................................................................................
2. Legal regulations 2 .........................................................................................................................
3. Safety instructions 3 ......................................................................................................................
4. Settings 4 .........................................................................................................................................
5. Functional principle 4 .....................................................................................................................
6. Technical data 5 ..............................................................................................................................
7. Mounting 6 .......................................................................................................................................
8. Electrical Connection 10 .................................................................................................................
9. Controller Layout Description 13 ..................................................................................................
10. Wiring Diagram 14 ........................................................................................................................
11. Taking into Operation 16 .............................................................................................................
12. Trouble Shooting 17 .....................................................................................................................
13. Maintenance & Cleaning 18 .........................................................................................................
14. Transport & Storage 19 ................................................................................................................
15. Parts supplied / Spare parts / Accessories 20 ..........................................................................

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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.
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.
Intended use
󰾬The unit is to be used exclusively for the dissipation of heat from control cabinets and enclosures (stationary,
not moving) 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
Operating error
Inappropriate work on or with the unit
The use of non-specified spare parts and accessories
Unauthorised modifications or changes to the unit by the user or his personnel
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 and can therefore be safely taken into
operation. Only authorised personnel is allowed to work on the unit. Unauthorised personnel must be prohibited
from working on the unit. Operating personnel must inform their superiors immediately of any malfunction of
the unit.
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.
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 operated according to the type plate and the wiring diagram, and must be protected
externally from overloading and electrical faults via suitable protective devices.
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. Settings
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 Warming
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 20250481
Cooling capacity L35L35 480 W
Cooling capacity L35L50 275 W
Compressor type Speed Control rotary compressor
Refrigerant / GWP R134a / 1430
Refrigerant Charge 82 g / 2.9 oz
High / low Pressure 30 / 6 bar
440 / 88 psig
Operating Temperature Range +10°C - +55°C
Air flow volume (system / unimpeded) Ambient air circuit: 315 / 377 m³/h
Cabinet air circuit: 190 / 377 m³/h
Mounting Wall mounted / recessed
Housing Material Mild steel, powder coated
Dimensions A x B x C (D+E) 310 x 475 x 98 mm
Weight 9.2 kg
Cut out dimensions 142.5 x 440 mm
Voltage / Frequency 48 V DC
Current L35L35 max. 5.0 A
Max. current 7.5 A
Nominal power L35L35 max. 225 W
Max. power 320 W
Fuse 16 A (T)
Short-circuit current rating 5 kA
Connection Connection terminal block
Ingress Protection IP 54
Approvals CE

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7. Mounting
Unpacking unit:
Please follow the below steps to unpack the unit.
STEP 1:
Stand the cooling unit upright with the pre-cut packaging opening facing up.
STEP 2:
Pull off the packaging opening.
STEP 3:
Hang the transport loop of the unit in the transport hook and lift it slightly.
STEP 4:
Pull off the packaging and slide out the tray with installation material and the short version of the operating
manual.
STEP 5:
Pull off the remaining packaging.
STEP 6:
The cooling unit can now be attached to the enclosure.

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Mounting:
The power supply rating on unit rating plate must comply with mains rating.
Always disconnect the power supply before opening the unit.
The heat load to be dissipated from enclosure should not exceed specific cooling output of the unit at any
condition. At cooling unit selection always cater for a safety margin of at least 15% extra cooling output in the
worst conditions.
Air inlets and outlets must be completely free from obstruction. Ensure that flows of air leaving and entering the
cooling unit, internal and external, are not obstructed. It must also be ensured in accordance with UL, that the
air outlet is not blowing air directly at an equipment operator. Should this be the case a barrier or duct shall be
provided to redirect the airflow.
Cooling unit enclosure air suction hole must be installed in the highest possible point.
When installing the unit on a door ensure it can take the weight. Before drilling the enclosure ensure the fixing
elements and couplings will not interfere with the equipment inside the enclosure itself. Disconnect power
before starting any work inside the enclosure.
If the unit is mounted in a recessed position, the controller bracket can be pulled according to the wall thickness
of the enclosure outwards as per steps below.
.

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Cold air outlet duct:
When using a cold air outlet duct please follow the steps below.
Filter installation:
If you install / replace a filter please follow the steps below.

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Condensate management:
High humidity and low temperatures inside the enclosure can lead to condensation on the evaporator.
Condensate that flows back into the enclosure can damage sensitive control electronics. The integrated
condensate evaporation of the cooling unit releases the condensate to the environment.
If too much condensation forms, the condensation is drained out of the cooling unit from the front through the
lower gill grilles. If this hose is removed, the cleaning drain MUST be open (see also point 13. Maintenance &
Cleaning).
In order to prevent the formation of excessive condensate, you should nevertheless:
- check the seals on regular intervals
- consider installing a door contact switch (order no. 3100001). This will prevent condensation forming
when enclosure door is left open.

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8. 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
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
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 Test button
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.
Remove the fixing screws from the PCB cover and the earth wire from inside it.
Lift off the PCB cover
Using a screwdriver turn the alarm temp. potentiometer on the PC-board slightly to the right (higher) 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
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.
Connect the door contact switch to terminals T1 & T2.
The contact must be closed when the cabinet door is closed.
SCCR
Refer to UL508A Supplement SB and Seifert Systems’ document Short Circuit Current Rating (SCCR) on methods
how to modify the available short circuit current within a circuit in the panel.

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9. 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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10. 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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11. Taking into Operation
Attention!
The unit can be damaged by lack of lubricant. To ensure that the compressor is adequately lubricated the oil,
which has been displaced during transport, must be allowed to flow back into it. The unit must therefore be
allowed to stand for at least 30 min. before being connected to the mains and taken into operation.
The unit / system must be protected with a MCB Type D or K. Upon connection the internal fan will start
working. If the temperature inside the enclosure is higher than the set value of the controller both the
compressor and external air fan start working. The cooling cycle will either stop once the air inside the
enclosure reaches the set temperature minus hysteresis or once the minimum On-time is reached. The setpoint
for the internal enclosure temperature is pre-set at 35°C.
The hysteresis is 3K, the minimum ON-time is 4 minutes, the minimum OFF-time is 3 minutes, for units with a
cooling capacity of more than 1 kW is it usually 7 minutes.

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12. 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.

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13. Maintenance & Cleaning
Always switch power supply off before starting any maintenance on the unit.
Wait for 5 minutes for electrical components to discharge.
The cooling unit is generally maintenance free and can be operated without filters in most environments.
If the ambient air is extremely dusty, we recommend installing filter mats (see accessories). These should be
cleaned or replaced at regular intervals. Oily or greasy filter mats should be replaced immediately. Do not use a
steam jet or high pressure to clean the filter mats. Do not wring out the filter mats.If the ambient air is
extremely oily, we recommend the use of metal filters (see accessories). They can be cleaned with standard
cleaning agents and reused. In addition the unit should have regular functional tests (approx. every 2,000 hours
depending on the grade of ambient pollution).
Note: The use of filter mats / metal filters reduces the cooling capacity of the unit..
Disposal
The cooling unit contains R134a refrigerant and small quantities of lubricating oil. Replacement, repairs and
final disposal must be done according to the regulations of each country for these substances.

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14. 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 %
the cooling unit should always be stored according to the installation position
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).

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15. Parts supplied / Spare parts / Accessories
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
Seifert Systems GmbH Seifert Systems Ltd. Seifert Systems AG Seifert Systems GmbH Seifert Systems Ltd. Seifert Systems Inc. Seifert Systems Pty Ltd.
Albert-Einstein-Str. 3 HF09/10 Wilerstrasse 16 Bärnthal 1 Rep. Office 75 Circuit Drive 105 Lewis Road
Hal-Far Industrial Estate North Kingstown Wantirna South
42477 Radevormwald Birzebbuga, BBG 3000 4563 Gerlafingen 4901 Ottnang 26100 Cremona RI 02852 3152 Victoria
Germany Malta Switzerland Austria Italy USA Australia
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