Combi 302 Polar Top

Ventilation requirement of up to 430 m3/h.

Combi 302 Polar Top is a ventilation unit that combines two heat recovery technologies.

Passive heat recovery takes place via a counterflow heat exchanger that utilises between 85% and 95% of the energy in the extracted air. Active heat recovery takes place via a heat pump that utilises the residual energy. The heat pump has a COP > 4, which eliminates the need to install a heating coil with an attached mixing circuit. Combi 302 Polar Top can increase the temperature of the supply air to over 30°C.

The heat pump also makes it possible to cool the supply air in the summer by up to 10°C. Due to the low air exchange, this does not function as an air conditioning system, but cooling the air intake reduces its humidity, giving a more pleasant and comfortable climate inside the home, even when the indoor temperature is high.

Combi 302 Polar Top is delivered with a built-in pre-heating element, which protect the counterflow heat exchanger against icing. This ensures continuous operation at low outdoor temperatures.


With a CO2-sensor installed, the ventilation speed can be pre-programmed with CTS 602 to run at a higher ventilation steps when CO2 reaches high level in the extract air. CO2-level is programmable.



An EM-box allows heat recovery from the air from the range hood and thereby helps to heat the supply air. The EM-box is equipped with a steel filter which efficiently cleans the range hood air of fat particles and thereby protects the system.


Pollen filter F7

A pollen filter class F7 can be fitted in the unit. The pollen filter is fitted with the G4 plate filter.

Installation kit

The installation kit comprises of four vibration absorbers and a water trap for the condensation outlet. The water trap can be ordered separately.

Heating cable

To protect the condensation outlet against frost, a 3 metre-long self-regulating heating cable can be ordered.


Dimensions (WxDxH) 900 x 604 x 808 mm
Plate type casing Aluzinc steel plate, white powder coating RAL9016
Heat loss casing 32 W /-32 W
Heat exchanger type Counterflow heat exchanger in combination with a heat pump
Fan type EC, constant volume
Filter class Standard G4
Duct connections Ø 160 mm / Ø 125 mm
Condensate drain PVC, Ø 20×1,5 mm
External leakage < 0,54 %
Internal leakage < 1,71 %
Supply voltage 230 V (±10 %), 50/60 HZ
Max. input/power 3,1 kW / 13,5 A
Tightness class IP31
Standby power 3,2W
Ambient temperature -20/+40 °C
Refrigerant R134a


Capacity of standard unit as a function of qv and Pt, ext.

SEL values according to EN 13141-7 are for standard units with G4 filters and without heating element.

SEL values comprise the unit’s total power comsumption incl. control.

Temperature efficiency

Temperature efficiency for units with counterflow heat exchanger according to EN308.

Temperature efficiency EN308: ɳ t = (tsupply air-tfresh air)/(textract air-tfresh air)

NB!  Temperature efficiency is only for the counter flow heat exchanger (without heat pump operation)

Sound data

Sounddata is for qv = 210 m3/h and Pt, ext = 100 Pa in accordance with EN 9614-2 for surface and EN 5136 for ducts.

Sound output level LWA drops with falling air volumes and falling back-pressure.

At a given distance, the sound pressure level LpA will depend on the acoustic conditions at the installation site.


COP (air-air)

Heat output factor COP [-] supply air as a function of outdoor temperature t21 [°C] and volume flow qv [m3/h] in accordance with EN14511 at a room temperature t11 = 21°C

COP according EN14511 is calculated for the heat pump and counter flow heat exchanger combined.

Heat output supply air

Heat output Qc [W] as a function of qv [m3/h] and outdoor air temperature t21 [°C]. In accordance with EN 14511, t11=21°C (extract air)
Heat output is the contribution to room heating added to the fresh air via Compact P to the supply air.
The ventilation loss is the heat output that is lost without heat recovery at the given volume flow air.

All dimensions are in mm.

    1:    Fresh air
    2:    Supply air
    3:    Extract air
    4:    Discharge air
    5:    Condensate drain
    6:    Electric supply

The Combi 302 Polar Top is controlled using its CTS 602 operating panel, featuring a wide range of functions, e.g., menu-controlled operation, weekly programme settings, filter monitor with timer, fan speed adjustment, summer bypass (free cooling), supply-heating element control, error messages etc.

The CTS 602 comes with factory settings, including a default setting which can be customised to operational requirements to achieve optimum operation and utilisation of the system.

The operating panel must be placed in a dry, frost-free location, at least 1.5 m above floor level and at least 0.5 m from any corner. Avoid placing the panel on an external wall or in areas in direct sunlight.

Operating instructions for the CTS 602 can be found in a separate user manual supplied with the unit.

Functional overview CTS 602 overview

Functional overview  

 + Standard

- Accessories

3 levels The control function is divided into 3 levels: User/Service/Factory with various options at each level  +
Weekly plan The unit has 3 weekly programmes (with a factory setting of “off”)
• Programme 1: for working families
• Programme 2: for stay-at-home families
• Programme 3: for businesses
There is also an option for you to set your own weekly programme.
User option 1 This allows you to override the operating mode in the main menu via an external potential-free contact or PIR sensor.  +
Alarms Alarm log featuring the last 16 alarms.  +
Filter monitor Filter monitor with timer (factory setting of 90 days). Adjustable to 30/90/180/360 days.  +


Bypassing the outdoor air reduces heat recovery, enabling the desired supply air temperature to be maintained spring, summer and autumn.  +
Air quality Allows you to choose whether to switch humidity sensors and/or CO2 sensors on and off.  +/-
Humidity control Allows you to set a higher or lower ventilation step in the case of high/low air humidity.  +
CO2 control Allows you to set a higher or lower ventilation step in the case of a high/low CO2 level.  -
Air exchange Allows you to select a low ventilation step in the case of low outside temperatures and air humidity.  +
Defrost function Temperature-based automatic function for defrosting the heat exchanger.  +
Frost protection In case of failing heating system, the unit is turned off to avoid further cooling with a risk of the water heating coil frost bursting.  +
Temperature control Allows you to select the temperature sensor which will control the unit.
• T15 ROOM (panel sensor)
• T10 EXT (fitted in a representative extraction valve)
• T3 EXHAUST (extract air)
Room control Allows you to set the regulator to control the room temperature.  +
Air volume Allows you to set four ventilation steps. Supply air and extract air are set individually.
• Step 1 < 25%
• Step 2 < 45%
• Step 3 < 70%
• Step 4 < 100%
Fire alarm This allows you to connect fire-detecting thermostats, smoke detectors and other fire alarm contacts.

In case of an alarm, smoke dampers are closed and the unit stops.

Joint alarm Outlet for joint alarm  +
Constant pressure control Allows control from both the extract air and supply air side.  -
Cooling The heat pump has a reversible coolingcircuit, which means that the coolingcircuit can be reversed, with the unit cooling instead of heating the supply air.


Intake air control Allows you to set the regulator to control the intake air temperature/supply air
(only available if the control unit has been configured for a supply-heating element).
Delayed start-up There is a possibility for a delayed start-up by the fans, when a closing damper is installed.  +
Expansion PCB Allows you to make additional connections, e.g.
• User option 2 overrides User option 1 (e.g. connecting an EM box)
• Up to 500 W direct
• Can give the signal for external heating if the defrost function is used
• Switching the central heating system on/off
Reset Allows you to restore the factory settings.  +
Manual test Allows you to test the unit’s functions manually.  +
Language Option for setting the relevant language (Danish/Finnish/Norwegian/Swedish/German/English/French).  +