Compact S

Specifications & Technical Data

Compact S is an energy-efficient total indoor climate solution for all types of low-energy buildings, single-family homes, flats and small office areas in commercial leases with a ventilation requirement of up to 375 m3/h.

Compact S recovers the energy from the extracted air using a highly efficient counter flow heat exchanger. The remaining energy that is not utilised by the counter flow heat exchanger is used by the heat pump to produce hot water, and to further heat the supply air.

The heat pump has a reversible cooling circuit, which means that, in the summer, the unit can cool the supply air by up to 10 °C. Due to the low air exchange, the cooling does not function as an air conditioning system. On cooling, the supply air is dehumidified, which gives a more pleasant indoor climate than is possible with an ordinary ventilation unit without a heat pump.


Consumer profile, water heater L (large)
Energy efficiency class A
Energy efficiency for water heating – average climate 118 %
Annual electricity consumption – average climate 852 kWh/annum
Temperature settings on the thermostat 10 – 65 °C
Sound power level LWA 57 dB(A)
The water heater can function outside peak load periods (Smart-grid) No
Guidelines for assembly, installation and maintenance See installation instructions
Energy efficiency for water heating – cold climate 118 %
Energy efficiency for water heating – warm climate 118 %
Annual electricity production – cold climate 852 kWh/annum
Annual electricity consumption – warm climate 852 kWh/annum


Dimensions (WxDxH) 600 x 600 x 2250 mm
Weight 160 kg
Plate type casing Aluzinc steel plate, white powder coating RAL9016
Heat exchanger type Polystyrene counterflow heat exchanger
Fan type EC, constant rotation
Filter class Standard G4
Duct connections Ø 160 mm
Condensate drain PVC, Ø 20×1,5 mm
External leakage < 0,78%
Internal leakage < 1,47%
Supply voltage 230 V (±10 %), 50/60 HZ
Tightness class IP31
Standby power 3 W
Ambient temperature -20/+40 °C
Refrigerant R134a

Ecodesign/ERP data

Fan data
Motordata (optimalt driftspunkt)

* 1 Input without heating element (accessory).
* 2 Input Compact Polar
* 3 At ± 250 Pa and 265 m3/h according EN 13141-7.
* 4 At ± 100 Pa and 265 m3/h according EN 13141-7.

1: Fresh air
2: Supply air
3: Extract air
4: Discharge air


The Compact S is controlled using its CTS602 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 CTS602 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
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.  +
User option 2 With an Expansion PCB mounted, 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
• Output relai
• Switching the central heating system on/off
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.  +
Summer/Winter operation Possible to set operation for summer and vinter  
Winter low Allows you to select a low ventilation step in the case of low outside temperatures  
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 low Stops the unit at a low room temperature. Hereby is cooling of the home avoided in case of a failing central heating system. Standard set to OFF. Can be set from 1 to 20 degrees and is controlled by:
• T15 ROOM (panel sensor)
• T10 EXT (fitted in a representative extraction valve)
• T3 EXHAUST (extract air)
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%
Legionella control It is possible to choose a weekday or a day during the month, where the sanitary hot water
temperature reaches 65 °C, for example between 1 and 6 o´clock.
External firealarm Possible to connect the unit to external firealarm.  
Joint alarm Outlet for joint alarm.  +
Constant pressure control Allows control from both the extract air and supply air side.  –
Cooling Via bypass (can only cool with outdoor temperature) and
cool recovery (can only cool with indoor temperature).
This allows you to choose whether to run the system at a higher or the highest ventilation step during cooling.
The weekly programme has an option for setting cooling at night.
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).
External heating element • Temperature sensor T7 is an supply air sensor
• Integrated frost protection for external water heating element
• Motorised valve and circulation pump control unit
External electric heating element • Temperature sensor T7 is an supply air sensor
• Overheating protection
Delayed start-up There is a possibility for a delayed start-up by the fans, when a closing damper is installed.  +
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).  +