VPL 28

Ventilation requirement of up to 1.000 m3/h.

VPL 28 is for anyone who wants ventilation with highly efficient heat recovery, and comfort heating and cooling.

The system extract hot, humid air from e.g. the kitchen, bathroom and utility room, at the same time removing dust particles, moisture and odours from the home. Furthermore, the energy from the extract air is used to heat or cool the incoming air. The system can be equipped with supplementary heating elements that can be connected to an electric or central heating system. VPL 15 will produce a comfortable incoming air temperature even in the coldest winter weather.

When you buy VPL 28, you get a comfortable and healthy indoor climate and cost savings on your heating bill.

The systems are suitable for locating in an attic space.

To the VPL 28 system is it possible to connect a filter unit with a built-in heatpipe (passive heat exchanger). The heat pipe increases the heating effect with up to 40 % in the cold season – without using extra electricity. 



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.

Electrical heating surface incl. regulation

When you fit an electrical heating surface, you can raise the fresh air temperature to the desired level at any time. The electrical heating surface is supplied ready to fit into the fresh air duct and, for easy fitting, the device is pre-fitted with all the required sensors.




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.


Expansion PCB

The expansion PCB provides additional functions for the CTS 602 control unit, e.g. controlling the EM-box.

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.


Water heating element incl. regulation (duct mounted)

The supply temperature can always be raised to the required level using a water heating element. The water heating element is designed to be built into the duct and must be connected to the primary heating supply. Supplied with two-way adjustment valve, temperature sensor and frost thermostat.


FU 28 - Filterunit med heatpipe

An option is a FU 28 filter unit with heat pipe, which is connected to the VPL 28 unit.

The heat pipe slightly raises the temperature of the outdoor air, thereby increasing the heat pump’s efficiency in the VPL 28 aggregate significantly during the winter.

With an integrated FU 28 heat pipe unit, in most cases there is no need for a heating coil with mixing circuit.

For FU 28 a bag filter M5 and F7 can be ordered.

VPL 28 is an energy-efficient ventilation unit for heat recovery and cooling of homes and small commercial buildings with a ventilation requirement of up to 1000 m3/h.

Heat recovery is via a heat pump that can utilise the recovered energy better than with e.g. a counterflow heat exchanger.

The heat pump has a reversible cooling circuit, which means that the unit can both heat and cool the air.

VPL 28 is supplied fully tested and ready for use. Fitting and commissioning must be carried out by an authorised electrician or plumber.

Dimensions (WxDxH) 700 x 570 x 765 mm
Weight 65 kg
Plate type casing Aluzinc steel plate, white powder coating RAL9016
Fan type EC, constant volume
Filter class G4 duct filter
Duct connections Ø250 mm
Condensate drain PVC, Ø 20×1,5 mm
Supply voltage 230 V (±10 %), 50/60 HZ
Max. input/power 2139 W /9,3 A
Tightness class IP31
Standby power 3 W
Ambient temperature -20 / +40 °C
Compressor type Piston compressor
Refrigerant R407C


Max Pa capacity of standard unit, Pt,ext as a function of qv, with regard to SEL-values.

SEL-values according to EN13414-7 for a standard unit with M5- and F7-filters an no heating element.

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

Conversion factor: J/m3 : 3600 = W/m3/h

Sound data

Sound data for qV = 1000 m3/h and Pt, ext = 100 Pa according to EN 9614-2 for surfaces and EN 5136 for ducts.

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

Sound output level LpA at a given distance will depend on acoustic conditions in the place of installation.


COP (air/air)

Heat effect factor COP [-] supply air as function of outdoor temperature [°C] and volume flow qv [m3/h].

According to EN14511, extract air = 21°C.


Heat effect (supply air)

Heat effect Qc [W] as a function of qv [m3/h] and fresh air temperature [°C].

According to EN 14511, extract air = 21 °C

Supply air temperature (heating)

Supply air temperature [°C] as a function of fresh air temperature [°C] and volume flow qv [m3/h] balanced flow.

Extract air temperature = 21 [°C], 45 RH [%]

Supply air temperature (cooling)

Supply air temperature [°C] as a function of fresh air temperature [°C] and volume flow qv [m3/h] balanced flow.

Extract air temperature = 24°C


All dimensions are in mm.

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

VPL 28 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.


1: Fresh air
2: Supply air
3: Extract air
4: Discharge air
5: Condensate drain
6: Electric and water heating


T1: Outdoor air sensor
T2/T7: Supply air sensor
T9: Heating element frost protection
T5: Capacitor sensor
T6: Evaporator sensor
T10: Room sensor

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).
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.  +
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).  +