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This document describes the Seifert cooling unit, model 43301001, an industrial accessory designed for dissipating heat from electrical control cabinets and similar enclosures to protect sensitive components. It is not intended for household use. The unit ensures that clean cabinet air does not come into contact with ambient air, which may be dirty or polluted, through two completely separate air circuits. It can function effectively in extreme ambient conditions, such as dusty and oily air, with a standard operating temperature range of 50°F to 131°F. Units can also be ordered with an additional electrical cabinet heater.
The cooling unit operates on a functional principle involving a refrigeration circuit with a compressor, evaporator, condenser, and expansion device. It uses R134a refrigerant, which is chlorine-free and has a low Ozone Depletion Potential (ODP) and Global Warming Potential (GWP). The compressor compresses the refrigerant, raising its pressure and temperature. This hot, high-pressure gas then passes through the condenser, where it is cooled by ambient air and condenses into a liquid state. The liquid refrigerant then flows through a capillary pipe, reducing its pressure before reaching the evaporator. In the evaporator, the refrigerant absorbs heat from the cabinet air, causing it to evaporate and change back into a gas. This process cools the cabinet air. The gas is then drawn back into the compressor, completing the cycle.
For condensation management, in environments with high humidity and low internal enclosure temperatures, condensation may form on the evaporator coil. Standard cooling units include a drain hose at the bottom of the unit for connection to a drain pipe. Units with condensate evaporators have an internal evaporator based on self-regulating PTC cartridges. Condensate is drained to an internal recipient where it evaporates when in contact with the cartridge surface. The resulting steam is directed towards the condenser, and the PTC heater cartridge is permanently connected. The recipient has an overflow socket at the bottom of the unit, for which a drain pipe is supplied.
The unit can be switched on and off via a door contact switch. When delivered, the door contact terminals are bridged on the female connector. To connect a door contact switch, the bridge must be removed, and the switch connected. The contact must be closed when the cabinet door is closed.
The unit is pre-set at 95°F, which is suitable for most electronic devices. The controller allows for adjustment of the cooling set point (St/St1) between 68°F and 122°F. To change the set point:
The power supply rating on the unit rating plate must comply with mains rating. Always disconnect the power supply before opening the unit. The heat load to be dissipated from the enclosure should not exceed the specific cooling output of the unit at any condition. Cooling unit selection should always allow for a safety margin of at least 15% extra cooling output in the worst conditions. Ensure that flows of air leaving and entering the cooling unit, internal and external, are not obstructed. It must also be ensured that the air outlet is not blowing air directly at an equipment operator. Should this be the case, a barrier or duct should be provided to redirect the airflow. The 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 that fixing elements and couplings will not interfere with the equipment inside the enclosure itself. Disconnect power before starting any work inside the enclosure. A drilling template is provided, and the required cuts on the enclosure must be made. The sealing strip on the cooling unit must be fitted to the enclosure to ensure proper sealing. Do not use the unit within the first 15 minutes after installation to allow for adequate lubrication of the compressor.
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 regularly. The unit should also undergo regular functional tests (approximately every 2,000 hours, depending on ambient pollution). Always switch off the power supply before starting any maintenance.
The manual provides a troubleshooting guide for common issues:
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.
The unit comes with an instruction manual, CE Declaration, mounting template, M6*16 bolts, A6.4 washers, M6 toothed washers, lifting hook M8 x 12, PVC washer, drain pipe, female connector, and foam tape. Available accessories include fibre filter media EU2 (SP-43250001-O-1), washable aluminium filter (SP-43250001-BF-1), stainless steel filter holder incl. filter media (SP-43250001-BG-1), and a door contact switch (3100001).
General| Brand | Seifert |
|---|---|
| Model | 43301001 |
| Category | Accessories |
| Language | English |
