Comfort 252 Top

The Comfort 252 Top is an energy-efficient ventilation unit with heat recovery for homes and smaller commercial buildings with a ventilation requirement of up to 253 m3/h.

This unit has been thoroughly tested, with improvements being continually made during its manufacture for more than 40 years. These have focused on low energy consumption, easy user operation and maintenance.

Comfort 252 Top is a system with compact dimensions that can be built into a cabinet with a width of 60 cm.

Comfort 252 Top can also be ordered with a build-in pre-heater for frost-protection.

The Comfort 252 Top is factory tested and ready for use. Installation and commissioning must be performed by an authorised electrician.

Dimensions (WxDxH) 562 × 575 ×1120 mm
Weight 41 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
Supply voltage 230 V (±10 %), 50/60 HZ
Max. input/power 177 W /0,77 A / Polar 777 W / 2,95 A
Tightness class IP31
Standby power 3,4 W
Ambient temperature -20/+40 °C
Lækage klassifikation A1 (*1)
Heat loss 0,84W/m2.K (*2)
Heat loss classification T2

Ecodesign/ERP data

Fan data
Motordata (optimalt driftspunkt)

Electrical pre-heating element (Frost protection)

Avoid having to defrost the unit, resulting in a loss of power. With temperature sensors supplied to be fitted in the ducts.

User selection/Range hood solution

It is also possible to activate user selection mode (Step 4) via a potential-free contact. The set includes a cable with two RJ12 connectors.
Connect the connector at the unit and connect the control panel and the 10 m of cable, for example, to a range hood, ind the two-connectionbox.

User selection/range hood-damper solution

It is also possible to activate user selection mode (Step 4) via a potential-free contact.
The set includes an RJ12 cable, a connection box for the range hood, damper connections as well as a 230V main supply plug.

Electrical pre-heating element (Frost protection)

An electrical pre-heating element heats up the outdoor air before it enters the unit. This avoids having to defrost the unit, resulting in a loss of power.

There are temperature sensors supplied to be fitted in the ducts.

Pollen filter F7

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

Water trap

The water trap makes sure that condensate water runs freely from the unit.

 

Noise-attenuating flexible hose

For easy fitting and excellent noise attenuation between the system and the distribution box and/or between the system and roof vents.

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.

 

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.

 

DBTU damper

If there is not enough space to fit an EM-box, Nilan offers a DTBU damper, which can be fitted between kitchen and bathroom. The damper functions precisely like the EM-box but requires longer cables.

Expansion PCB

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

Project model

Can be supplied with all connectors leading from the housing. This solution makes it easier to connect external components, such as range hood, damper and Modbus.

Fire suppression system

Can be supplied with an integral fire suppression system, for use in apartment blocks with a common discharge air duct and possibly common outdoor air duct.

CO2-sensor

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.

SEC* average climate - 42.3 kWh/(m2.a)
SEC* cold climate - 81.4 kWh/(m2.a)
SEC* warm climate - 17.2 kWh/(m2.a)
SEC-Class A+
Type Residential ventilation unit
Type of drive Variable speed drive
Type of heat recovery system Recuperative
(counterflow heat exchanger)
Thermal efficiency
of heat recovery
91 %
Maximum flow rate 253 m3/h (100 Pa)
Electric power input of fan drive, including any motor control equipment, at maximum flow rate 77,6 W
Sound power level (LWA) 36 dB(A)
Reference flow rate 0,049 m3/s (177,1 m3/h)
Reference pressure difference 50 Pa
SPI 0,17 W/(m3/h)
Central demand control 0.85
Maximum internal leakage 1.5 %
Maximum external leakage 2.9 %
Visual filter warning A yellow light flashes on the user panel when filters need changing.
To maintain the performance and energy efficiency of the unit it is very important to change filters regularly.
Disassembly instructions www.nilan.dk

* Specific energy consumption

 

AEC - annual electricity consumption 199 kWh/år (100 m2)
AHS** average climate 4667 kWh (100 m2)
AHS** cold climate 9110 kWh (100 m2)
AHS** warm climate 2106 kWh (100 m2)

** Annual heating saved

Capacity

Capacity of standard unit as a function of qv og 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. 

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

Temperature efficiency

Temperature efficiency for units with counterflow heat exchanger according to EN13141-7 (dry).

Sound data

Sound data for qV = 126 m3/h and Pt, ext = 100 Pa according to EN3744 for surfaces and EN 5136 for ducts.

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

Sound pressure level LpA in a semi-hemisphere at a distance of 1 m from the system.

Sound data

Sound data for qV = 220 m3/h and Pt, ext = 100 Pa according to EN3744 for surfaces and EN 5136 for ducts.

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

Sound pressure level LpA in a semi-hemisphere at a distance of 1 m from the system.

All dimensions are in mm.

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

CTS150 control unit

The CTS150 control unit is a simple control unit used to control the 252 Top system. It offers the user only limited access to settings.

Users can adjust the air volume and humidity levels.

The control unit also shows whether the system is working and when an alarm is triggered.

To set and regulate the system, it has to be connected to a PC via a USB flash drive. Download the software from NilanNet and install. The software can be used not only to set the system, but also to read operating data.

CTS602 control panel

The CTS602 operating panel is 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.

Automation
T2/T7: Supply air sensor
T9: Heating element frost protection
T3: Extract air sensor
T4: Discharge air and defrost sensor
T8: Fresh air sensor
T10: Room sensor

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

Functional overview CTS150 control

Functional overview  

 +Standard 

-Accessories

Filter monitor Filter monitor with timer (factory setting of 90 days). Adjustable to 30/90/180/360 days.  +
100 % bypass Bypassing the outdoor air reduces heat recovery when heat recovery are not needed.  +
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 winter. +
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.  
Temperature control The system’s overriding temperature sensor is T3 extract air.  +
Air volume Allows you to set four ventilation steps stepless. Supply air and extract air are set individually.
Step 1 < 25% - Step 2 < 45% - Step 3 < 70% - Step 4 < 100%
 +
User option It is also possible to activate user selection mode (Step 4) via a potential-free contact.  -

 

Functional overview CTS 602 control

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.  +
Datalog Possible to log data. Kapacity 46.000 logs
• Adjustable between 1 and 120 minutes
• If “OFF”, only events and alarms are logged
+
Filter monitor Filter monitor with timer (factory setting of 90 days). Adjustable to 30/90/180/360 days.  +

Bypass     

Bypassing the outdoor air reduces heat recovery when heat recovery are not needed.  +
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 CO2 level.  -
Summer/Winter operation Possible to set operation for summer and winter.  
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.  +
Frostprotection 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 stepless.
Supply air and extract air are set individually.
Step 1 < 25% - Step 2 < 45% - Step 3 < 70% - Step 4 < 100%
 +
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).  

 

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