High-Efficiency Heat Recovery Unit S&P CAD-COMPACT 4500

The S&P CAD-COMPACT 4500 ECOWATT heat recovery unit, reference 5153140600, is a high-efficiency double-flow ventilation unit designed to renew indoor air by recovering a large part of the thermal energy from the extracted air. It offers a nominal airflow rate of 4,165 cubic meters per hour at 150 pascals and is especially suitable for ventilation installations in commercial premises, offices, hospitality venues, public buildings, educational centers, and other tertiary-use spaces.

The reference corresponds to the CAD-COMPACT 4500 ECOWATT N8 version, equipped with a counterflow aluminum plate heat exchanger, plug-fan fans with EC motors, independent supply and extract filtration, a motorized internal bypass, and pre-wired components up to the electrical cabinet. The ECOWATT version is supplied without an integrated control system, allowing the appropriate regulation strategy for each project to be selected externally.

S&P CAD-COMPACT 4500 ECOWATT heat recovery unit

The CAD-COMPACT 4500 is part of Soler & Palau’s range of high-performance compact heat recovery units. Its operation is based on two independent air circuits: one extracts stale indoor air and the other introduces fresh air from outside.

Both airflows pass through a heat exchanger without direct mixing, allowing thermal energy to be transferred from the extract air to the supply air and thus reducing the energy needs associated with building climate control.

Nominal airflow rate of 4,165 cubic meters per hour

S&P states for the CAD-COMPACT 4500 a nominal airflow rate of 4,165 cubic meters per hour with 150 pascals of available pressure.

• Nominal airflow rate: 4,165 cubic meters per hour.
• Reference available pressure: 150 pascals.
• Unit size: 4500.

These performance figures place the unit within the high-capacity ventilation solutions of the CAD-COMPACT series, intended mainly for commercial or tertiary-use buildings and premises.

Counterflow plate heat exchanger

The heat recovery unit uses a counterflow-type aluminum plate heat exchanger. This arrangement extends the heat exchange path between both air streams and enables high levels of thermal recovery.

The CAD-COMPACT range features exchangers certified by Eurovent, and S&P states efficiencies of up to 88% within the family.

84.6% efficiency at nominal airflow

For the CAD-COMPACT 4500 model, the S&P technical catalog specifies a wet efficiency of the heat recovery unit of 84.6% at nominal airflow.

This value refers to the test conditions indicated by the manufacturer:

• Outdoor temperature: -5 degrees Celsius.
• Outdoor relative humidity: 80%.
• Indoor temperature: 20 degrees Celsius.
• Indoor relative humidity: 50%.

Actual performance may vary depending on operating airflow, temperatures, humidity, and the specific installation conditions.

ErP efficiency data

The specific ErP datasheet for reference 5153140600, prepared in accordance with European Regulation 1253/2014, states a thermal efficiency of 76.6%. This figure corresponds to the ErP regulatory methodology and should not be confused with the 84.6% wet efficiency published by S&P under the nominal conditions of its technical catalog.

Plug-fan fans with EC motors

The CAD-COMPACT incorporates plug-fan fans with backward-curved impellers and EC motors. This technology allows the fan speed to be electronically regulated and the airflow to be adapted to the needs of the installation when combined with a compatible control system.

The motors feature integrated electronic protection. S&P specifies IP44 protection and insulation class B for the motors in the range.

Maximum absorbed power of 2.60 kilowatts

The maximum electrical power absorbed published for the 4500 model is 2.60 kilowatts, corresponding to the sum of the two fans in the heat recovery unit.

• Maximum absorbed power: 2.60 kilowatts.
• Unit power supply: three-phase.
• Voltage: 400 volts.
• Frequency: 50-60 hertz.

Three-phase 400-volt power supply

Unlike the smaller sizes in the series, the CAD-COMPACT 4500 requires a three-phase 400-volt power supply.

The electrical supply, protections, cable sizes, and switching devices must be sized in accordance with the manufacturer’s technical documentation and applicable electrical regulations.

ECOWATT version without integrated control

Reference 5153140600 corresponds to the ECOWATT variant. This version does not include a factory-fitted Plug & Play integral controller.

The main components are supplied pre-wired up to the electrical cabinet:

• Supply fan.
• Extract fan.
• Bypass actuator.
• Pressure switches for dirty filter detection.
• Temperature probes.

This makes it possible to externally incorporate the most suitable control strategy for the installation using the compatible accessories and control systems defined by S&P.

Electrical cabinet and safety switch

The heat recovery unit includes an electrical cabinet for wiring the components and an external safety switch, facilitating installation and electrical maintenance operations.

Motorized internal bypass

All CAD-COMPACT versions include a motorized internal bypass. This element allows air to bypass the heat exchanger when temperature conditions require it and the control system commands it to open.

With suitable control, it can be used for free-cooling ventilation strategies, taking advantage of outdoor air when conditions make it possible to reduce the need for climate control.

F7 filter on supply air

The outdoor air introduced into the building passes through a standard filter:

• Traditional class: F7.
• ISO classification: ePM1 70%.

S&P uses a low-pressure-drop filter for supply air, helping to retain a significant portion of the particles present in outdoor air before it is introduced into indoor spaces.

M5 filter on extract air

The circuit that extracts indoor air includes as standard:

• Traditional class: M5.
• ISO classification: ePM10 50%.

This filtration protects the inside of the unit and the heat exchanger from particles carried by the extracted air.

Possibility of installing a second filter

The CAD-COMPACT design allows a second additional filter to be installed inside the unit. This item is supplied as an accessory and makes it possible to adapt the filtration level to the specific needs of the project.

Filter clogging detection

The heat recovery unit incorporates differential pressure switches designed to detect the increase in pressure drop caused by filter clogging.

This function makes it easier to plan periodic maintenance operations and replacement of the filter elements.

Double-skin galvanized steel casing

The unit is built with a double-skin galvanized steel casing, designed to provide mechanical strength and insulation against the thermal and acoustic conditions inside the heat recovery unit.

30-millimeter thermal and acoustic insulation

In the CAD-COMPACT 4500 size, S&P specifies a 30-millimeter-thick mineral wool thermal and acoustic internal insulation.

The insulating material has an incombustible classification of A1/M0 according to the manufacturer’s documentation.

700 × 440 millimeter rectangular connections

The 4500 model uses rectangular air connections, suitable for the high airflow rates handled by the unit.

• Connection dimensions: 700 × 440 millimeters.
• Connection type: rectangular.
• Circuits: outdoor air, supply, extract, and exhaust.

Horizontal installation

The CAD-COMPACT is designed for horizontal installation. Access to filters, fans, and the heat exchanger is made from the sides, which must be taken into account when defining maintenance clearances around the unit.

The compact layout makes it possible to install the heat recovery unit in technical rooms and suspended ceilings that have sufficient structural space for a unit of this size and weight.

CAD-COMPACT 4500 dimensions

The main casing dimensions indicated in the official drawing are:

• Main length: 2,207 millimeters.
• Main width: 1,993 millimeters.
• Height: 598 millimeters.
• Air connections: 700 × 440 millimeters.
• Weight: 336 kilograms.

The technical drawing should be used to define the final installation dimensions, as it also includes the electrical cabinet, connections, maintenance access, and the areas required to remove filters and access the fans.

Side condensate drain

The unit includes a 1/2-inch condensate drain outlet. Drainage must be connected and executed in accordance with the installation instructions to ensure proper removal of the water generated during the recovery process.

Acoustic characteristics

For the CAD-COMPACT 4500, S&P publishes the following sound pressure levels, measured in free field at 3 meters:

• Sound pressure at intake: 51 dB(A).
• Sound pressure at discharge: 64 dB(A).
• Radiated sound pressure: 50 dB(A).

The corresponding sound power levels are:

• Sound power at intake: 71 dB(A).
• Sound power at discharge: 84 dB(A).
• Radiated sound power: 70 dB(A).

The final acoustic levels on site may vary significantly depending on the ductwork, silencers, enclosures, suspended ceilings, supports, and specific installation conditions.

Minimum outdoor air temperature

S&P sets for the CAD-COMPACT series a minimum outdoor air temperature of -10 degrees Celsius.

When operation at lower outdoor temperatures is required, the manufacturer indicates the use of a preheating coil located at the outdoor air intake.

Post-heating coils as external accessories

The CAD-COMPACT range does not include additional integrated post-heating coils inside the unit. When the project requires additional thermal treatment of the supply air, S&P provides different external solutions available as accessories.

Accessible maintenance from the sides

The heat recovery unit design facilitates maintenance through independent side access. The filters can be removed from the side panels, and the heat exchanger also has access for inspection and cleaning operations.

It is important to keep the areas indicated by S&P in the dimensional drawing clear so that filters, fans, and the heat exchanger can be serviced without dismantling the duct installation.

Applications of the S&P CAD-COMPACT 4500

Soler & Palau recommends the CAD-COMPACT series for air renewal in installations such as:

• Commercial premises.
• Offices.
• Hospitality establishments.
• Public buildings.
• Schools and educational centers.
• Other tertiary buildings with double-flow ventilation needs.

Technical characteristics of the S&P 5153140600

• Brand: Soler & Palau.
• Series: CAD-COMPACT.
• Model: CAD-COMPACT 4500 ECOWATT N8.
• Reference: 5153140600.
• Type: high-efficiency double-flow heat recovery unit.
• Version: ECOWATT.
• Integrated control: no.
• Nominal airflow at 150 pascals: 4,165 cubic meters per hour.
• Wet efficiency at nominal airflow: 84.6%.
• Heat exchanger type: counterflow aluminum plates.
• Exchanger certification: Eurovent.
• Fans: plug-fan with backward-curved blades.
• Motor technology: EC.
• Supply filter: F7 / ePM1 70%.
• Extract filter: M5 / ePM10 50%.
• Optional second filter: yes.
• Internal bypass: yes, motorized.
• Power supply: three-phase 400 volts.
• Frequency: 50-60 hertz.
• Maximum absorbed power: 2.60 kilowatts.
• Air connections: rectangular, 700 × 440 millimeters.
• Main length: 2,207 millimeters.
• Main width: 1,993 millimeters.
• Height: 598 millimeters.
• Weight: 336 kilograms.
• Installation: horizontal.
• Casing material: double-skin galvanized steel.
• Insulation: 30-millimeter thermal and acoustic mineral wool.
• Insulation classification: A1/M0.
• Condensate drain: 1/2 inch.
• Minimum outdoor air temperature: -10 degrees Celsius.
• Radiated sound pressure: 50 dB(A) at 3 meters in free field.
• Sound pressure at intake: 51 dB(A).
• Sound pressure at discharge: 64 dB(A).

Heat recovery for high-airflow installations

The S&P CAD-COMPACT 4500 ECOWATT combines a nominal airflow rate of 4,165 cubic meters per hour with a high-efficiency counterflow exchanger, EC motors, F7/M5 filtration, internal bypass, and a robust double-skin construction.

Its three-phase 400-volt power supply, 700 × 440 millimeter rectangular connections, and pre-wired ECOWATT configuration without integrated control make it suitable for professional ventilation projects where high air renewal capacity and flexibility to define the control system externally are required.