Blauberg KOMFORT EC DBW 900 L S21
- Capacity diagram
- Designation key
- Additional characteristics
Air handling units for efficient supply and exhaust ventilation in flats, houses, cottages and other buildings. Heat recovery minimises ventilation heat losses. Provide controllable air exchange to create the best suitable indoor microclimate. Compatible with round Ø 200, 250 mm round air ducts.DESIGN
The casing is made of double-skinned aluzinc panels, internally filled with 20 mm mineral wool layer for heat and sound insulation. The casing has fixing brackets with vibration absorbing connectors for easy installation. The spigots for connection to the air ducts are located at the side of the unit and are rubber sealed for airtight connection to the air ducts. The service panel ensures easy access to the internals for cleaning, filter replacement and other maintenance operations.FANS
High-efficient external rotor EC motors and centrifugal impellers with backward curved blades are used for air supply and exhaust. EC motors have the best power consumption to air flow ratio and meet the latest demands concerning energy saving and high-efficient ventilation. EC motors are featured with high performance, low noise level and totally controllable speed range. Dynamically balanced impellers.
The unit is equipped with a plate counter-flow polystyrene heat exchanger for heat recovery. The drain pan located under the heat exchanger is designed for condensate collection and drainage. The air flows are completely separated in the heat exchanger. Thus smells and contaminants are not transferred from the extract air to the supply air. Heat recovery is based on heat and/or humidity transfer through the heat exchanger plates. In the cold season supply air is heated in the heat exchanger by transferring the heat energy of warm and humid extract air to the cold fresh air. Heat recovery minimizes ventilation heat losses and heating costs respectively. In the warm season the heat exchanger performs reverse and intake air is cooled in the heat exchanger by the cool extract air. That reduces operation load on air conditioners and saves electricity.
The unit is equipped with a water (glycol) heater for operation at low outside air temperature. The integrated water heater is activated to warm up supply air flow if set indoor air temperature may not be reached by means of heat recovery only. Heat medium temperature control ensures supply air temperature maintaining. The air temperature sensor downstream of the waterheating coils and the return water temperature sensor are used for freezing protection of the water heater.BYPASS
The units are equipped with a bypass for summer ventilation (room cooling by cool air from outside) and heat exchanger freeze protection.AIR FILTRATION
The built-in G4 supply filter and G4 extract filter provide air filtration. The F7 supply filter (specially ordered accessory) may be used for efficient supply air filtration.
Mounting to the ceiling with fixing brackets. The correct mounted unit must provide free condensate collection and drainage as well as good access for servicing and filter replacement. Access for servicing and cleaning the filter: from the right or left side panel, depending on the unit modification.CONTROL AND AUTOMATION
The units are equipped with an S21 build-in automation system. The remote control panel is not included in the delivery set (available separately). The S21 controller allows integrating the unit into the Smart Home system or BMS (Building Management System). The unit can be controlled by the Blauberg AHU mobile application via Wi-Fi.
option: function is available when purchasing the appropriate accessory (see the "Accessories" tab).
|Parameter||KOMFORT EC DBW 900 L S21||Measurement unit|
|Number of water coil rows||4||-|
|Max. unit power||442||W|
|Max. unit current||3||A|
|Maximum air flow||286||l/s|
|Maximum air flow||1030||m³/h|
|Sound pressure level at a distance of 3 m||33||dBА|
|Temperature of transported air||-25...+40||°С|
|Insulating material||20 mm mineral wool||mm|
|Supply filter||G4 (Option: F7)||-|
|Heat recovery efficiency||75...88||%|
|Heat exchanger type||counter-flow||-|
|Heat exchanger material||polystyrene||-|
|Connected air duct diameter||250||mm|
|Type||Supply and exhaust||-|
- Selection method:
- Air capacity:
- Air capacity: --
- Pressure: ---
|Series||Motor type||Mounting type||Bypass||Heater type||Rated air flow [m³/h]||Service side||Control||Additional elements|
|KOMFORT||EC: electronically commutated motor||D: suspended mounting, horizontally directed spigots||B: with a bypass||W: water heater||550; 900||L: left
|S21||_: no additional elements
DTV: equipped with a differential pressure switch to control filter contamination
|KOMFORT EC DBW 900 L S21|
|G4 panel filter||FP 647х274х20 G4|
|G4 pocket filter||FPT 647x274x27 G4|
|F7 pocket filter||FPT 647x274x27 F7|
|Wi-Fi control panel||S22 Wi-Fi|
|LCD control panel||S25|
|Internal humidity sensor||FS2|
|CO₂ sensor with indication||CD-1|
|Kitchen hood||DAH 251-13|
|Electric preheater||EVH 250|
|Syphon kit||SFK 20x32|
|Silencer||SD 250 600/900/1200|
|Silencer||SDF 250 600/900/1200|
|Backdraft air damper||VRV 250|
|Air damper||VKA 250|
|Water mixing unit||WMG|
|Model||Overall dimensions [mm]|
|KOMFORT EC DBW 900 L S21||249||1350||1215||607.5||317||1346||1395|
|Sound power level, A-weighted||Total||Octave frequency band [Hz]||LpA 3 m||LpA 1 m|
|LwA to supply inlet [dBA]||80||30||64||72||69||74||73||71||71|
|LwA to supply outlet [dBA]||70||29||62||69||58||59||53||45||36|
|LwA to exhaust inlet [dBA]||78||29||60||69||72||70||71||64||70|
|LwA to exhaust outlet [dBA]||69||28||58||68||59||61||56||48||44|
|LwA to environment [dBA]||53||33||42||47||49||44||41||39||43||33||43|
HOT WATER COIL CALCULATION DIAGRAM
|How to use water heater diagrams.
Sample parameters: Air flow = 950 m³/h.
Outside air temperature = -15 °C.
Water temperature (in/out) = +90/+70 °C.
The air flow is 950 m³/h and the air speed in the heater is 3.35 m/s ①.
To calculate the maximum air temperature, find the intersection point of the air flow line ① with the rated outer temperature shown in blue line (e.g., -15 °С) and draw the line ② to the left until it crosses the water in/out temperature curve (e.g., +90/+70). From this point draw a vertical line to the supply air temperature downstream of the heater (+23 °С) ③.
|To calculate the heater power, find the intersection point of the air flow ① with the rated winter temperature shown in red line (e.g., -15 °С) and draw the line ④ to the right until it crosses the water in/out temperature curve (e.g., +90/+70). From this point draw a vertical line to the heater power axis (13.5 kW) ⑤. To calculate the required water flow in the heater, prolong this line ⑥ downwards to the water flow axis (0.14 l/s). To calculate the water pressure drop in the heater, find the intersection point of the line ⑥ with the pressure loss curve and prolong the line ⑦ to the right on the water pressure drop axis (1.5 kPa).|