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Fresh Air - STULZ/Puma

STULZ Free-Air – Free Cooling for Base Stations

STULZ - free cooling for base stations

Wherever shelters and switch cabinets already have conventional comfort air conditioning, the addition of a Free-Air cooling unit makes a huge difference to operating costs.

The system module takes over the control of the existing comfort A/C units and adds economical direct free cooling to the energy-intensive compressor cooling function. Whenever the ambient temperature allows, Free-Air is activated and the comfort A/C units are switched off.

Free-Air has been thoroughly tested, is simple to install, ready for operation immediately and easy to maintain.

Technical Specification

Model Cooling capacity
(in kW)
(WxHxD in mm)
Voltage (in V)
FCB350R2 3.5 640x600x600 48 (DC)
FCB600R2 6.0 640x600x600 48 (DC)


Puma SAPER Heat recovery unit

PUMA Fresh Air Handling Units are designed to supply fresh or tempered air into buildings to provide a more comfortable working environment. These aestheticallypleasing Air Handling Units can be used in various applications, and are suitable for mounting in various positions. These units can be supplied as Internal AHU's, or External Roof Mounted AHU's.

VRF Technology

VRF means "variable refrigerant flow". The volume or flow rate of refrigerant is accurately matched to the required heating or cooling loads thereby saving energy and providing more accurate control. An electrical inverter is used to vary the frequency of the power supply from a normal UK 50Hz enabling fine step speed control of motors (compressors) this in turn varies the quantity of refrigerant delivered and hence variable cooling or heating capacity.

It is a extremely efficient, reliable, energy saving way to heat and cool all types of buildings with minimum installation time or disruption. This is probably the best system currently available for mid to large applications.

Inverter Technology

Illustration of inverter technology

The inverter on some air conditioners signifies the ability of the unit to continuously regulate its thermal power flow by altering the speed of the compressor in response to cooling demand.

Traditional reverse-cycle air conditioners use a heat pump that is either working at maximum capacity or switched off, as the compressor's speed cannot be varied. In order to regulate temperature of the room, a thermostat is used to measure the ambient air temperature and switch the compressor on when the ambient air temperature is too far from the desired temperature.

Eliminating stop-start cycles increases efficiency, extends the life of components, and helps eliminate sharp fluctuations in the load the air conditioner places on the power supply. Ultimately this makes inverter air conditioners less prone to breakdowns, cheaper to run, and the outdoor compressor is generally quieter than a standard air conditioning unit's compressor.

Inverter technology smoothly and continuously modulates the unit’s performance. This allows the desired room temperature to be reached more rapidly and provides greater energy efficiency under normal operating conditions.