Compact P XL

Compact P XL is a multi-unit with several installations combined in one compact installation. It is intended for large dwellings with a ventilation requirement of up to 430 m3/h. Compact P XL ventilates the dwelling and produces domestic hot water. You can also combine the unit with a geothermal heat pump or an air source heat pump. Both of these can be fully integrated in Compact P XL. 

By combining several installations in just one installation, you save considerable space in the machine room. Another advantage is that the control systems work in unison, which optimises power consumption and thereby enables an overall saving in energy consumption.

Airflow (see planning data for SEL/SFP values)

Min : 50 m3/h
Max : 430 m3/h

The “heart and lungs” of the house

Compact P XL is not a traditional ventilation unit. In contrast to other ventilation units, it recovers 100% of the heat from the extract air. The counterflow heat exchanger makes it possible to recover up to 95% of the energy in the extract air. This is then used to heat the outdoor air. The integral heat pump will utilise any remaining energy for producing domestic hot water. 


Passive heat recovery

Passive heat recovery occurs via a counterflow heat exchanger with a temperature efficiency of up to 95%. The outdoor air is heated by the extract air. This ensures the least possible heat loss from the ventilation process. 

Due to the high level of heat recovery, ice may form in the exchanger during winter. The control system has an efficient de-icing function that will de-ice the exchanger if necessary. Alternatively, Compact P XL is available as a Polar model, which has an integral pre-heating element for frost protection. This ensures that ice cannot form in the exchanger, and it provides full heat recovery throughout the winter. 

Passive and active heat recovery

When the integral heat pump in the ventilation part is not producing domestic hot water, it can heat the supply air even further and thereby help heat the dwelling. 

This only happens when the indoor temperature or the supply air temperature falls below the value specified in the settings. 

When the heat pump heats the supply air, the domestic hot water is also heated slightly at the same time. The temperature may therefore exceed the one that you have set as your desired hot water temperature. 

Domestic hot water

The integral heat pump uses the energy in the extract air that has not been recovered by the counterflow heat exchanger. It uses this remaining energy to produce domestic hot water. 

There is software-based scald protection of 60 °C, which means that the temperature in the hot water tank will not exceed this. If the requirement for hot water is considerable, we recommend that you install an actual anti-scald valve under the hot water tank so the temperature in the tank can increase to 90 °C. Compact P XL is available with a solar coil mounted in the hot water tank.  If the requirement for domestic hot water is very high, the solar coil can act as supplementary heat source.

You can connect different energy sources to help heat the domestic hot water such as solar panels, district heating or a GEO geothermal heat pump. 

Anti-legionella function
Compact P XL has an anti-legionella function that you can activate manually or set to activate automatically.

100% bypass function

When the outdoor temperature is above 14 °C, the unit will operate in summer mode. The unit will then cool the indoor air if the indoor temperature gets too high according to the values specified in the settings. 

If the outdoor air is cooler than the indoor air, the bypass damper in the unit will open. The outdoor air will then bypass the heat exchanger, and the heat from the extract air will not get transferred to the outdoor air. This will help keep the temperature down inside the dwelling. 

If the outdoor air is warmer than the indoor air, the bypass damper will close. The outdoor air will then flow through the heat exchanger, which will recover the coolness from the cooler indoor air and use it to cool the outdoor air. 


Active cooling

The heat pump in the ventilation part is reversible. This means that it can both heat and cool the supply air. 

When the outdoor temperature is above 14 °C, the unit will operate in summer mode. The unit will then cool the indoor air if the indoor temperature gets too high according to the values specified in the settings.  

When cooling, the unit will first attempt to do so by means of the bypass function. If this proves inadequate, it will begin to cool actively via the heat pump.

This requires that the active cooling function has been activated as the process uses electricity.  But it is not wasted because the heat that is extracted from the supply air is transferred to the hot water tank. If the requirement for cooling is high, it is recommended that you install a scald protection device below the hot water tank.  You can then set the max. temperature in the hot water tank between 60 °C and 80 °C.


Compact P XL

Energy efficiency class for hot water production A
Consumer profile, water heater L (large)
Hot water tank 180l
Dimensions (W x D x H) 900 x 610 x 2065 mm
Weight 202 kg
Plate type casing Aluzinc steel plate, white powder coating RAL9016
Heat exchanger type Polyethylenterephthalat counterflow heat exchanger
Fan type EC, constant rotation
Filter class Greencycle ISO 16890 Coarse 75% (G4)
Duct connections Ø160 mm
Refrigerant R134a
Refrigerant filling 2 kg
Condensate drain PVC Ø20 x 1,5 mm
Supply voltage 230V 50/60 Hz
Max. input/power 2,4 kW / 10,4 A *1  -  3,6 kW / 15,6 A *2
Standby power 3 W
Tightness class IP31
Ambient temperature -20 / +40 °C
External leakage < 1,4 % *3
Internal leakage < 1,1 % *4

*1 - Input without heating element (accessory)
*2 - Input Compact P XL Polar
*3 - At ± 250 Pa according EN 308/EN 13141-7
*4 - At ± 100 Pa according EN 308/EN 13141-7



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

SEL values according to EN 13141-7 are for standard units with ISO 16890 Coarse 75% (G4) filters and without heating element.

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

Attention! The SEL values are measured and stated as a total value for both fans.

Temperature efficiency

Temperature efficiency as a function of volume flow qv [m3/h] for unit with counterflow heat exchanger.

Temperature efficiency according to EN13141-7 (2°C / 20°C).

NB! The temperature efficiency, is for the heat exchanger only (without heat pump operation).

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 XL to the supply air.

The ventilation loss is the heat output that is lost without heat recovery at the given volume flow air.

Ventilation loss: - - - - - - - - - - - -
Heat output: ________________

Tapped water

Tapped volume in litres Vmax [L] from Compact P tank as a function of tapped temperature t [C°] and tank temperature at 40°, 50° and 60°C.

Sound data

Sounddata is for qv = 275 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.


All dimensions are in mm. 

1. Outdoor air
2. Supply air
3. Extract air
4. Discharge air

The CTS602 control system is an advanced control system with many settings options. The control system is supplied with factory default settings that can be adapted to the operational requirements in order to achieve best possible operation and utilisation of the unit.

The HMI Touch panel provides an overview of the current operation of the unit. The structure of its menu makes it easy to navigate for both user and installer. You can choose from 2 different images for the main screen.

External communication
The CTS602 control system has an open Modbus RS485 protocol that can be used for communication via external CTS systems. The Modbus connection is used for e.g. Schneider's IHC or KNX systems.

Functional overview   +Standard
Filter monitor Filter monitor with timer notifies when it is time to change filters. Can be set between 30 and 180 days. +
Operating mode Can be set to Auto according to set values or set to heating or cooling mode. +
Stepless regulation The four ventilation steps can be set steplessly 20-100%, with various values for supply air and exhaust air. +
Humidity control Built-in humidity control can be set to high ventilation operation at high humidity (when in the shower) and low ventilation operation if the humidity in the home becomes too low. +
Active cooling The unit can be set to cool the supply air in the summer, should the need arise. When the heat pump cools, the heat is deposited in the hot water tank, so that you get “free” hot water when the unit is in cooling mode. +
Low outdoor temperature It is possible to lower the ventilation at low outdoor temperature, to avoid the indoor humidity becoming too low. +
CO2 control It is possible to control the ventilation level according to the CO2 level in the home. -
Temperature settings The temperature settings are used by the controller to regulate the operation of the entire system. +
Frost protection The control has an automatic function for defrosting the heat exchanger to prevent formation of ice. +
Frost protection Polar The Polar model has a built-in frost protection preheater to protect the counterflow heat exchanger so no ice occurs. +
Frost protection EHD The controller can control the EHD damper if the outdoor air enters through roof terminals. +
Domestic hot water Compact P produces the domestic hot water via the air / air heat pump in the ventilation part. +
Pause domestic hot water It is possible to set the hot water production on pause e.g. if no one is at home. In that way, energy is saved. +
Frost protection domestic hot water To protect the hot water tank, it is fitted with a frost protection function. +
Supplementary electrical heater domestic hot water

If the need for domestic hot water increases and the heat pump cannot keep up, a supplementary electrical heater can be activated to heat the domestic hot water.

Anti-scald protection The control has a built-in scalding protection, which prevents scalding of the users when the hot water tap is opened. +
Anti-Legionella The control has an Anti-Legionella treatment of the domestic hot water that can be activated manually or automatically. +
Anode Electronically monitored anode. Notifies when it is time to replace it to ensure a long service life of the hot water tank.  
Week program A week program can be made with various settings depending on the use of the home. +
User selection program 1 A user selection program enables you to use special settings that override the standard operating settings via a potential-free signal. Used e.g. if a cooker hood is connected to the system. +
User selection program 2 Used as user selection 1, but at the same time has an output signal that can be used e.g. to control a damper. +
Datalog Data logging as well as error messages and warnings. +
Output data All current values in the system operation. Most often used for troubleshooting. +
Emergency stop ventilation Do not turn off the ventilation, as this may damage the unit, duct system and in the worst case the home. But it may be necessary to briefly turn off the ventilation e.g. due to a emergency notification. +

You can find further information about all the functions in the Software and Installation instructions for the unit.


ATTENTION! When positioning the unit, you should always consider future services and maintenance. It is recommended that you leave a minimum of 60 cm of clear space in front of the unit.

It must be easy to replace filters and it must be possible to replace, for instance, fans and other components.

ATTENTION! The unit must be level to enable proper drainage from the condensate tray.

  • Connect the ventilation part to the duct system via spouts at the top of the unit.
  • Connect up the domestic hot water under the hot water tank to the right.

Smart Grid

Compact P XL has been certified in accordance with the German Smart Grid, which allows the electricity provider to override the operation so it becomes as cost effective as possible for the user. 

The Smart Grid solution can also be used in connection with solar cells if you want to optimise operation at times when most energy is being produced.


Download ecodesign datasheet here