Systemair Cleva Heat Recovery Units

Right choice, right here, right now

Systemair's Cleva range of heat recovery units is designed for optimal indoor climate control in commercial premises, offices, and schools. These units offer a cost-effective solution for achieving comfortable environments in spaces where floor area is limited, such as false ceilings.

Key Features and Benefits

Cleva units provide high energy efficiency and low noise levels without compromising performance. Their compact design makes them ideal for various applications. Key features include:

High Efficiency: Equipped with a plate heat exchanger offering up to 83% efficiency and low pressure drop, minimizing electricity consumption.
Compact Dimensions: Designed for installation in false ceilings, saving valuable floor space.
Corrosion Resistance: Enclosure features C5 corrosion resistance according to ISO 12944.
Integrated Control: Built-in controller for comprehensive management of unit components.
Flexible Installation: Suitable for indoor or outdoor installation with reduced height.
Configurable Panels: Interchangeable inlets and outlets allow for diverse air configurations.
Easy Maintenance: Designed for straightforward servicing.
EC Fans: Feature backward curved impellers with integrated electronic protection for stable operation and reduced SFP values. Available in 230V/I/50 Hz and 400V/III//50 Hz, with IP 54/55 protection.

Heat Recovery and Filtration

Heat Recovery: Utilizes an exclusive fin design for high performance and low pressure drop, with plates joined by a double fin for superior sealing.

Filtration: Offers optional additional filters for both return and supply air. A filter module can also be installed externally. Filter combinations include:

Supply Air: ePM10 60% (M5) / ePM1 55% (F7)
Supply Air: ePM10 70% (M6) / ePM1 70% (F9)
Supply Air: ePM1 55% (F7) / ePM1 80% (F9)
Exhaust Air: ePM10 60% (M5)
Exhaust Air: ePM10 70% (M6)
Exhaust Air: ePM1 55% (F7)

Optional Modules and Control System

Optional Modules:

Outdoor roof mounting
Module with cold, hot, or DX water coil
Module with impulsion filtration stage
Brackets for false ceiling or floor installation
Change of air flow direction (return for supply)

Control System: Cleva units feature an integrated electrical panel (IP65) and a controller for managing all components. Key control functions include:

Free-cooling/Free-heating Damper Control: Operates based on outside and return air temperatures.
Three Speed Selection: Idle, eco, and comfort modes to suit user needs.
Remote On/Off: Via digital input, BMS, or control unit.
Probe Reading: Monitors outdoor and room air temperatures.
BMS Connection: Supports Modbus RTU and BACnet IP communication for simplified configuration.
Dirty Filter Pressure Switch: Alerts when filters require changing.

Additional Control Optionals:

Constant flow or constant pressure control on both air flows.
Air flow control via CO2 probe.
Additional filtering stage pressure switch (supply air).
Control by supply air temperature or cascade.
Cooling, heating, or cooling/heating stage control (water or DX).
0-10V output (actuators and valves not supplied).
Ambient control unit for managing operating modes, setpoints, alarms, time programming, and overwriting.

Operating Modes

Cleva units adapt to seasons and preferences for a comfortable environment. The units offer efficient ventilation in various modes:

Winter Mode:

Description of air flow: Outdoor air (e.g., 5°C BS / 3.6°C BH) enters, passes through the heat exchanger, and becomes supply air (e.g., 21.5°C BS / 11.5°C BH). Exhaust air (e.g., 8.5°C BS / 6.6°C BH) is extracted, transferring heat to the incoming supply air.

Summer Mode:

Description of air flow: Outdoor air (e.g., 35°C BS / 24°C BH) enters, passes through the heat exchanger, and becomes supply air (e.g., 26.8°C BS / 21.7°C BH). Exhaust air (e.g., 25°C BS / 18°C BH) is extracted, pre-cooling the incoming supply air.

Technical Data

The following table details the specifications for the Cleva range:

Unit	Flow rate nominal [m³/h]	Air filter (Supply/Exhaust)	Efficiency Winter [%]	Efficiency Summer [%]	Electrical supply [V/PH/Hz+Pe]	Maximum input current [A]	Maximum input power [kW]
Cleva 500	500	ePM1 55% (F7) / ePM10 60% (M5)	82.6	82.4	230/1N/50+PE	3.9	0.59
Cleva 1000	800	ePM1 55% (F7) / ePM10 60% (M5)	81.8	81.5	230/1N/50+PE	4.0	0.59
Cleva 1500	1500	ePM1 55% (F7) / ePM10 60% (M5)	79.0	78.8	230/1N/50+PE	5.5	1.25
Cleva 2000	2000	ePM1 55% (F7) / ePM10 60% (M5)	79.1	78.9	230/1N/50+PE	8.5	1.81
Cleva 3000	3000	ePM1 55% (F7) / ePM10 60% (M5)	82.4	82.2	230/1N/50+PE	13.7	2.85
Cleva 4000	4000	ePM1 55% (F7) / ePM10 60% (M5)	82.4	82.1	400/3N/50+PE	8.1	5.05

Notes:

Filters are not included as standard. Filter classes are according to ISO 16890.
Conditions for efficiency ratings: Winter: Outside air 5°C BS / 3.6°C BH, Extract air 25°C BS / 14°C BH. Summer: Outside air 35°C / 24°C BH, Extract Air 25°C / 18°C BH.
Consumption figures are without optionals.

Configurations and Sound Levels

Overall Dimensions:

Unit	High [mm]	Width [mm]	Length [mm]	Weight [kg]	Duct connections diameter [mm]	Drain connection [mm]
Cleva 500	340 + 65	630	1500	91	250	1/2"
Cleva 1000	380 + 65	890	1700	135	250	1/2"
Cleva 1500	460 + 65	960	2050	197	350	1/2"
Cleva 2000	460 + 65	1270	2150	247	350	1/2"
Cleva 3000	599 + 65	1450	2500	362	450	1/2"
Cleva 4000	599 + 65	1890	2500	444	450	1/2"

*Dimensions shown are without optionals.

Sound Levels:

Unit	63 Hz [dB]	125 Hz [dB]	250 Hz [dB]	500 Hz [dB]	1 kHz [dB]	2 kHz [dB]	4 kHz [dB]	8 kHz [dB]	Sound power level free discharge [dBA]	Radiated sound power [dBA]	Sound pressure (2) [dBA]
Cleva 500	100	87	82	79	73	73	64	61	82	68	65
Cleva 1000	100	93	87	78	73	73	64	58	83	70	66
Cleva 1500	100	86	89	78	76	71	64	60	84	69	67
Cleva 2000	99	88	88	78	79	76	69	64	85	71	68
Cleva 3000	101	86	87	79	78	77	68	63	85	70	68
Cleva 4000	101	87	89	83	83	79	74	67	88	70	70

Notes:

Data obtained with nominal flow rate and density 1.2 kg/m³. Air filters ePM10 70% (M6) in extraction and ePM1 55% (F7) in supply, with available pressure of 75 Pa in both air flows.
Sound pressure is measured in free discharge at 2 m distance.

Selection Curves

The following selection curves illustrate the performance characteristics of the Cleva units for different models and filter combinations. They plot available pressure against airflow, allowing users to select the appropriate unit for their specific ventilation requirements.

Cleva 500 Selection Curves

Graphs showing available pressure [Pa] versus air flow [m³/h] for Cleva 500, with curves for filter combinations: ePM10 70% (M6), ePM1 55% (F7), ePM10 60% (M5) + ePM1 55% (F7), and ePM1 55% (F7) + ePM1 80% (F9).

Cleva 1000 Selection Curves

Graphs showing available pressure [Pa] versus air flow [m³/h] for Cleva 1000, with curves for filter combinations: ePM10 70% (M6), ePM1 55% (F7), ePM10 60% (M5) + ePM1 55% (F7), and ePM1 55% (F7) + ePM1 80% (F9).

Cleva 1500 Selection Curves

Graphs showing available pressure [Pa] versus air flow [m³/h] for Cleva 1500, with curves for filter combinations: ePM10 70% (M6), ePM1 55% (F7), ePM10 60% (M5) + ePM1 55% (F7), and ePM1 55% (F7) + ePM1 80% (F9).

Cleva 2000 Selection Curves

Graphs showing available pressure [Pa] versus air flow [m³/h] for Cleva 2000, with curves for filter combinations: ePM10 70% (M6), ePM1 55% (F7), ePM10 60% (M5) + ePM1 55% (F7), and ePM1 55% (F7) + ePM1 80% (F9).

Cleva 3000 Selection Curves

Graphs showing available pressure [Pa] versus air flow [m³/h] for Cleva 3000, with curves for filter combinations: ePM10 70% (M6), ePM1 55% (F7), ePM10 60% (M5) + ePM1 55% (F7), and ePM1 55% (F7) + ePM1 80% (F9).

Cleva 4000 Selection Curves

Graphs showing available pressure [Pa] versus air flow [m³/h] for Cleva 4000, with curves for filter combinations: ePM10 70% (M6), ePM1 55% (F7), ePM10 60% (M5) + ePM1 55% (F7), and ePM1 55% (F7) + ePM1 80% (F9).

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