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VENTILATION - OUTDOOR CABINETS

Ventilation with forced internal and free external air circulation

Fan units are mounted inside SZD cabinet in order to shorten time of carrying away heat dissipation emitted by equipment installed in the cabinet. Fan units cause faster air movement inside the cabinet and in the cabinet’s walls. In case of low temperature the system of heaters joint with thermostats is applied. Above solutions enable failure-free operation of access systems.

DESIGN 1. Fan unit 2. Thermostats 3. 400 W heaters with fan 220 V, 50/60 Hz

Ventilation with forced internal and external air circulation

In cabinets which are endangered of strong solar radiation, it is recommended to use ventilation with double air circulation. In this solution, air circulates inside the cabinet and additionally flows between the double walls of the cabinet. Moreover, circulation of external air is forced by fan units mounted in the roof. In case of low temperature the system of heaters joint with thermostats is applied. Above solutions enable failure-free operation of access systems.

DESIGN 1. Fan unit 2. Roof ventilators 2. Thermostats 3. 400 W heaters with fan 220 V, 50/60 Hz

Ventilation based on use of heat exchanger and direct venting

installed equipment with high heat dissipation, there is solution based on cross heat exchanger. Heat exchanger is a type of radiator, where there are two air flows: warm from the inside of the cabinet (radiator’s plates collect heat) and second from the outside of the cabinet (cooled by exchanger). Cross system of the heat exchanger enables to retain tightness of the cabinet and external and internal air flows do not mix together.

Another solution is direct venting of the cabinet, which is used when it is necessary to carry away lots of heat dissipation. In cabinet’s roof or on the door there are mounted fans which pull external air (through double wall and filters system). External air goes through appliances which emit heat and is carried away outside by roof or perforations on the doors.

AIR-CONDITIONING

Air conditioned SZD cabinets

Air conditioners are used when the required temperature inside of the cabinet is lower than ambient temperature. The power of air conditioners is selected according to pre-set climatic conditions, heat dissipation by active equipment and dimensions of the cabinet. On individual customer’s request the air conditioners can be fixed inside or outside of the cabinet. In case of inside installation, they are usually fixed on the doors or side panels, what enables easy service access.

REVERSIBLE AIR HEAT PUMP AHP 2.0

The second-generation AHP 2.0 reversible air heat pump is a precision air-conditioning unit with a heating function. An advanced control algorithm for the fans, compressor and expansion valve maintains the set temperature in the air-conditioned telecommunications cabinet while minimising the consumption of electricity. The control algorithm adjusts the pump operating parameters in real time according to the amount of heat emitted by the active equipment in operation.
Starting up a heat pump, unlike standard air-conditioner cooling solutions, does not require a large inrush current and does not cause interference with the mains supply.
A very important operating parameter to consider when designing a heat pump is the sound level. The introduction of speed-controlled fans has made it possible to reduce the operating sound at night and whenever the pump starts and stops. This is especially important for its use in urban areas.
The AHP reversible heat pump comes in horizontal and vertical versions. In each, the design is optimised to occupy as little space as possible. The ease of connection and installation allows the pump to be used in cabinets or telecommunications containers.
Heating is also done by thermodynamic process and is therefore more economical than using electric heaters. The fact that a single unit performs both cooling and heating functions is also significant. This allows the control to be coordinated and avoids both processes being switched on too frequently.
The heat pump controller has remote communication capability, allowing the operation of the unit and the conditions inside the air-conditioned cabinet to be monitored at all times. In this way, service costs can be reduced and failures can be prevented.

  • Cooling capacity: A35A35 2400 W
  • Cooling capacity: A35A50 2000 W
  • Heating capacity: 2500 W
  • Power suply: 230 V, 50 Hz
  • Maximum current input – cooling: 3,5 A
  • Maximum current input – heating: 6 A
  • Power consumption A35A35: 1400 W
  • Operating time: 24/7
  • Amount of agent R134a: 0,8 kg
  • Maximum pressure: 42 bar
  • External fan: 1200 m3/h
  • Internal fan: 1200 m3/h
  • Sound level of the device: 54 dB
  • Colour: RAL 9005 / RAL 7035
  • Operating temperature: od -20 do +42 °C
  • Set temperature range: od +10 do +50 °C
  • Weight: 50 kg
  • Protection degree in accordance - EN 60529: IP 21/55
  • Communication: Ethernet (local) RJ45 HTTP, FTP, SNMP