Seifert 43042001, User Manual

Version No. 1-8 - 04.06.2022

Doc. No. 9943042001

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16. 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. Once the air inside the
enclosure reaches the set temperature the compressor and external fan will stop.

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.

The unit is pre-set at 35°C, which is suitable for most of the electronic devices.

17. Trouble Shooting

Failure

Condition

Cause

Solution

Unit

doesn't

cool

 Internal fan does not work

 Power not connected.

 Verify power supply

 Internal fan works, external fan
 and compressor don't work

 Enclosure temperature is below
 setting temperature (St1)

 Verify values of parameter  "St1"

Door switch contact is open

 Verify door switch

Controller doesn't work

 Replace controller

 Internal fan works, external fan
 and  compressor don't work.
 Display shows alternating OFF 
 and temperature

 The sequence of the phases
 inside the power supply
 connector is incorrect

 Change phases inside power 
 supply connector

Unit

doesn't

cool

 External and internal fan work,
 compressor does not work

 Compressor motor electrical
 failure

 Have compressor replaced  
 by qualified service technician

 Capacitor for compressor failed  Replace capacitor

 Compressor works, external fan
 doesn't work

 External fan needs to be
 replaced

 Replace external fan

Enclosure

temperature 

too hot

 Compressor and fans (external
 and internal) work all the time

 Cooling unit undersized

 Enclosure needs a cooling unit with higher capacity

 Compressor and external fan 
 work in alternating mode
 (ON / OFF)

 Thermal compressor protector
 triggered 

 Verify if ambient temperature  is too high, clean condenser

 Refrigerant leakage

Contact dealer / service centre

Excessive 

condensate

 Enclosure door open

 Ambient air gets into the  
 enclosure

 Ensure door is closed, add  a door switch and connect
 it to controller

 Enclosure door closed

 Enclosure IP protection class 
 is below IP54

 Seal all openings of the  enclosure

 Damaged or misplaced sealing
 strip

 Repair sealing strip  accordingly

18. Maintenance & Cleaning

Always switch power supply off before starting any maintenance on the unit.

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).

Disposal
The 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.