Intelligent rack climate control with a wide performance range

Depending on requirements, Sidecoolers can operate with water or coolant and are installed on the side of the rack, placing them especially close to the heat source. Their modular design enables cooling capacity to grow in keeping with performance requirements. Large heat exchanger surfaces allow high flow temperatures to be attained using cold water, which makes the Sidecooler especially energy efficient. Fans can be replaced during operation.

From individual rack cooling to bayed suite cooling, the Sidecooler offers maximum application flexibility.


Sidecooler DX (coolant)

  • Modular design
  • Demand-based cooling capacity
  • Energy saving due to 2 indiv. designed expansion valves
  • Low noise emissions
  • Data access via HTTP(S), SNMP, Bacnet


Technical data

  • Cooling capacity < 28 kW
  • Coolant R410A
  • Installation height < 2.2 m

Sidecooler CW (cold water)

  • Modular design
  • Demand-based cooling capacity
  • High energy efficiency
  • Especially good for free cooling
  • Data access via HTTP(S), SNMP, Bacnet


Technical data

  • Cooling capacity < 50 kW
  • Installation height < 2.2 m

Closed ventilation architecture

Independent of room temperature

Ventilation between Sidecooler and rack is completely independent of room temperatures and noise emissions can be reduced to a minimum. An optional high efficiency heat exchanger with an extended heat exchanging surface enables chilled water flow temperatures of up to  30 °C at a server supply air temperature of 35 °C to be achieved (deltaT chilled water flow / server supply air K5)

(Diagram view from above)

Open ventilation architecture

Energy saving ventilation

The ventilators in the Sidecooler set the exact volume of air in motion that is required for forcing the warm air away from the servers. This prevents high volumes of air leakage and so results in energy savings. All Sidecoolers can also be used in Master-Slave mode, meaning that all the fans in an enclosure operate at the same speed. Altogether, a total of 64 Sidecoolers can work in one Master-Slave group.

(Diagram view from above)

Hybrid ventilation architecture

Rear side closed

The rear side of the rack row forms a warm aisle. This variant can completely replace an entire warm aisle enclosure. The open architecture at the front of the rack row enables redundant cooling to be used and also means that existing fire extinguishers in the room will also be effective for the rack row, thus eliminating any additional installation work.

(Diagram view from above)

Hybrid ventilation architecture

Front side closed

In this type of ventilation architecture, an entire cold aisle enclosure is replaced. In combination with a warm aisle enclosure, the influence of cables on the flow of cool air can be significantly reduced. This variant is particularly suitable for racks with widths of 600 mm.  

(Diagram view from above)

Can external devices from other manufacturers be connected to the Sidecooler DX?

No, that is not possible, as the external unit and the Sidecooler DX have common communications interfaces, which are closely coordinated and adapted to each other. This is the only way to ensure secure data monitoring.

Does the Sidecooler external unit need a main switch?

Yes. This is required to switch off the external unit during maintenance work, for example.

What needs special consideration before installing an external unit?

Before you install an external or outdoor unit on the outside wall /roof, the legal limits for sound emissions (residential, mixed, industrial areas) need to be checked.
The external unit’s maximum noise level can be found in the data sheets provided with each Sidecooler. If you have any questions, feel free to contact our customer service on +49 2741 283-770.

What do I have to consider when choosing a Sidecooler DX?

The minimum heat load is 30 % of the nominal heat load. If the heat load is lower than this, the Sidecooler constantly switches itself on and off. After the Sidecooler DX has been switched off, the external unit’s blocking time (at least 6 minutes) must be observed. During this time, the rack is not cooled and its temperature rises.

Which control cable is used to connect the external and the internal units?

We recommend using a weather resistant Ölflex Classic 110 LT 2G1.5 mm² with wire ferrules on both ends.

Can the cooling coils (heat exchanger) be replaced without having to remove the Sidecooler?

The Sidecooler was designed for easy maintenance. After releasing the quick couplers on the flexible tubes, both heat exchangers can be pulled out and then replaced or simply cleaned.

What is the SCHÄFER pipe-in-pipe assembly?

In the pipe-in-pipe assembly, the inflow is guided through the condensation tray inside the return pipe. This minimises pressure loss on the airside and prevents condensation forming on the inflow pipe. This means there is no leakage air or condensation above the raised floor.

Why can the pipe-in-pipe assembly be lowered?

By lowering the pipe-in-pipe assembly, there are no barriers to air volume flow for cooling the rack. Airside turbulence and cross-section restrictions are reduced to a minimum, which results in energy savings.

Can Sidecooler fans be retrofitted?

The fans are scalable and can be retrofitted at any time. This enables the Sidecooler to be adapted to future demands.

Why was the Sidecooler CW equipped with an especially large heat exchanger surface?

The large heat exchanger surface means the Sidecooler CW can be operated with very high cold water temperatures. Depending on the heat load that needs to be dissipated, a server supply air temperature of up to 26 °C can be achieved with a cold water flow temperature of 22 °C.

What Sidecooler DX or CW models are available?

Sidecooler models are available for open architectures (in connection with cold aisle enclosures), hybrid architectures (one side open, one side closed) and for closed architectures.

Is a condensate pump always needed in a Sidecooler?

If an on-site condensate gradient pipe has been laid underneath the Sidecooler, a condensate pump will not be needed.

What server supply air temperatures are stipulated by the ASHRAE standard?

The ASHRAE standard forms the planning basis for IT components.
Since 2011, there have been 4 ASHRAE classifications
Class A 1: server supply air temperature up to 33 °C
Class A 2: server supply air temperature up to 35 °C
Class A 3: server supply air temperature up to 40 °C
Class A 4: server supply air temperature up to 45 °C

What does the term “free cooling” mean?

Free cooling means energy-saving cooling without a chiller. The higher the cold water temperature, the longer free cooling can be used to dissipate the thermal energy generated by IT components. Free cooling also achieves a particularly low PUE value (Power Usage Effectiveness).

Sidecooler details

The cooling solution based on coolant (DX)

Due to its modular design, the Sidecooler DX is suitable for a variety of ventilation architectures. Its cooling capacity of up to 28 kW makes it ideal for racks and data centres in small and medium-sized IT rooms. Up to 6 fans can be installed during operation, allowing the cooling capacity to be adapted individually to current requirements. The Sidecooler DX allows an energy-efficiency label of A+++ to be obtained, as a special power receiver is used for sub-cooling the refrigerant/coolant (R410A) and the two expansion valves can be controlled individually. In stand-by mode, only those Sidecoolers actually required for cooling operate at the optimal power level. A high-performance heat exchanger (evaporator made of copper piping with pressed on aluminium fins) provides an additional increase in performance.

The pressure tested cooling circuit is filled with refrigeration machine oil. The weather-proofed drive motor is maintenance free and equipped with a thermal overload protector. Housing and frame are made of strong, galvanised steel sheet with an additional weather-proof polyester stove-enamel finish and sound insulation on the inside, which makes the Sidecooler a very low noise device. Operation requires a suitable outdoor unit.

The cooling solution based on cold water (CW)

The energy-efficient, low noise Sidecooler CW generates a cooling capacity of 28 kW (in closed and hybrid architectures) even without fans, thanks to its high degree of efficiency. An intelligent control unit detects the load and, if necessary, raises the cold water flow temperature in the chiller (setpoint adjustment) by means of a 0-10 V signal. This enables free cooling to be used for a longer time. High cold water temperatures (up to 30 °C) are possible. Up to 6 energy-optimized EC fans can be retrofitted during operation at any time, due to the Sidecooler’s modular design. This enables the cooling capacity to be raised to up to 50 kW. Water and electrical connections can be fitted either on the top or base sides.

The Sidecooler CW is compatible with various ventilation architectures and consequently can be used for racks, data centres and HPC applications.

SCHÄFER Logic Interface

Both Sidecoolers (DX and CW) are equipped with the SCHÄFER Logic Interface, a central operating unit, to enable integration in all current monitoring systems. A touch screen ensures easy operation and, with the help of 13 sensors, displays the relevant parameters, such as status overview of exhaust and supply air, flow and return temperatures, fan speed and valve opening. Access to the control unit is gained via HTTP(S) and SNMP v2c and v3, though parameter changes can only made after entering a password. The pull-out control box allows easy access and maintenance.