The document provides detailed specifications for 28 heat recovery air handling units, known as komfort ec and lbe models, highlighting their capacity, construction, efficiency, and application in ventilation systems. Key features include high-efficiency motors, advanced heat recovery systems, and automatic controls to optimize indoor air quality and energy savings. The units are designed for easy installation and maintenance, with various options for air filtration and duct compatibility.

1. 28
Heat recovery air handling units
KOMFORT EC LBE
Air capacity – up to 940 m3
/h
98 %
Application
Air handling units for efficient supply and exhaust ventilation in flats, houses, cottages and other buildings.
For arranging of controlled energy saving ventilation systems.
Heat recovery minimises ventilation heat losses.
Controllable air exchange for creating the best suitable indoor microclimate.
Compatible with round Ø160, 200 and 250 mm air ducts.
Design
The casing is made of double-skinned aluzinc panels, internally filled
with 25 mm mineral wool layer for heat and sound insulation.
Casing has fixing brackets with vibration absorbing connectors for
easy installation.
The hinged casing panel ensures easy access to the internals for
cleaning and other maintenance operations.
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 bypass damper is opened automatically in summer time to cool
down a room with cool outside air. For the model with a heater the bypass
damper is also used for the heat exchanger freezing protection.
Fans
High-efficient external rotor EC motors and centrifugal impellers are
used for air supply and exhaust.
The forward curved blades in KOMFORT EC LB300/LB400/
LBE300/LBE400 S11 provide permanent air flow.
The KOMFORT EC LB600/LBE600 S11 model has impellers with
backward curved blades.
EC motors have the best power consumption to air capacity 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.
Heat recovery
The unit is equipped with a counter-flow polystyrene heat exchanger
with a large surface area and high heat recovery efficiency.
Heat recovery is based on utilization of heat energy contained in the
extract air stream for heating up of supply air stream. Extract air transfers
most of its heat to the intake air flow. Heat recovery reduces heat energy
losses in cold seasons.
In summer the heat exchanger performs reverse and intake air is
cooled in the heat exchanger by the cool extract air. This contributes to
better performance of the air conditioner in ventilated premises.
The drain pan under the heat exchanger block is used for
condensate collection. The drain pan is fitted with a drain pipe for
condensate removal.
The electronic freeze protection system is used to prevent the heat
exchanger freezing in the cold season:
• KOMFORT EC LBE S11: the bypass damper is opened according to
the temperature sensor feedback to let supply air flow pass along the
bypass air duct. Synchronously, the heat exchanger surface is warmed
up with warm extract air flow. After a freezing danger is over the bypass
damper is closed and the unit reverts to the normal operation mode.
• KOMFORT EC LB S11: in case of a freezing danger registered by the
outdoor temperature sensor the supply fan is turned off to let the heat
exchanger surface get warmed up with warm extract air flow. After a
freezing danger is over the supply fan is turned on and the unit reverts to
the standard operation mode.
Air heater
The KOMFORT EC LBE S11 model is equipped with an electric
heater for operation during cold seasons at low outside temperature.
The integrated electric heater is activated to warm up supply air
flow if set indoor air temperature may not be reached by means of heat
recovery only.
Smooth heat output control ensures automatic supply air
temperature maintaining.
Two integrated overheat protection thermostats, one actuated at
+60 °C with automatic restart and the other one actuated at +90 °C with
manual restart.
Air filtration
The built-in G4 pocket supply filter and G4 cassette extract filter
provide efficient air filtration. Optionally, an F7 supply filter may be used.
Control and automation
The units incorporate an integrated control system with a wall-
mounted control panel and sensor display.
The standard delivery set includes a 10 m cable for connection of the
unit and the control panel.
Automation functions:
• Activating/deactivating the unit.
• Setting low, medium and high speeds for the supply and extract fan as
well as air flow control. Each speed is individually adjusted during set-up.
• Automatic heater activation/deactivation and smooth heat output
control. Heater overheating protection. Cooling of the heater at the end
of the heating cycle for KOMFORT EC LBE S11.
• Opening/closing the bypass damper for summer ventilation.

2. 29
• Setting and maintaining room or duct air temperature.
• Timer activation/deactivation and set-up.
• Setting day- and week-scheduled operation of the unit.
• Operation control on feedback from FS1 duct humidity sensor (to be
ordered separately) or from the humidity sensor in the control panel.
• Filter clogging control.
• System shutdown on signal from a fire alarm panel.
• Controlling supply and exhaust air dampers (available separately).
• Cooler control (available separately).
Mounting
The unit is suitable for floor, ceiling or wall mounting using fixing
brackets.
The correct mounted unit must provide free condensate collection
and drainage as well as good access for servicing and filter replacement.
The service access is on the side of the removable service side
panel, leftwards along supply air flow.
B2
L
L1
B
B3 B1
H
H1H2
D
Model
Dimensions [mm]
ØD B B1 B2 B3 H H1 H2 L L1
KOMFORT EC LB300 S11
159 566 125 391 186 475 202 118 1081 1187
KOMFORT EC LBE300-3 S11
KOMFORT EC LB400 S11
199 687 255 588 220 514 235 139 1092 1174
KOMFORT EC LBE400-3 S11
KOMFORT EC LB600 S11
249 940 250 837 345 620 262 156 1200 1282
KOMFORT EC LBE600-3 S11
Model
Replaceable filter G4
(pocket type)
Replaceable filter F7
(pocket type)
Replaceable filter G4
(cassette type)
Duct humidity sensor
KOMFORT EC LB300 S11
FPT-EC LB/LBE300 G4 FPT-EC LB/LBE300 F7 FP-EC LB/LBE300 G4
FS1KOMFORT EC LBE300-3 S11
KOMFORT EC LB400 S11
FPT-EC LB/LBE400 G4 FPT-EC LB/LBE400 F7 FP-EC LB/LBE400 G4
KOMFORT EC LBE400-3 S11
KOMFORT EC LB600 S11
FPT-EC LB/LBE600 G4 FPT-EC LB/LBE600 F7 FP-EC LB/LBE600 G4
KOMFORT EC LBE600-3 S11
Overall dimensions
Accessories

3. 30
Parameters
KOMFORT EC
LB300 S11
KOMFORT EC
LBE300-3 S11
KOMFORT EC
LB400 S11
KOMFORT EC
LBE400-3 S11
Voltage [V / 50-60 Hz] 1 ~ 230
Fan power [kW] 0.138 0.306
Fan current [A] 0.9 2.0
Electric heater power [kW] - 3.0 - 3.0
Electric heater current [A] - 13.0 - 13.0
Total unit power [kW] 0.138 3.138 0.306 3.306
Total unit current [A] 0.9 13.9 2.0 15.0
Maximum air capacity [m3
/h] 300 450
RPM 1380 2600
Sound pressure level at 3 m distance [dB(A)] 24-45 28-47
Transported air temperature [°С] -25 up to +60
Casing material aluzinc
Insulation 25 mm mineral wool
Extract filter cassette G4
Supply filter pocket G4 (F7)*
Connected air duct diameter [mm] 160 200
Weight [kg] 40 42 45 47
Heat recovery efficiency [%]** 86 up to 98 85 up to 98
Heat exchanger type counter-flow
SEC Class A+
Heat exchanger material polystyrene
* Оption.
** Heat recovery efficiency is specified in compliance with the EN308 EU norms.
Pressure[Pa]
0
0 50 100 150 200 250 300 350
100
200
300
400
500
0.8 W/l/s
1.0 W/l/s
1.2 W/l/s
Air flow [m3
/h]
Heatrecovery
efficiency[%]
100
95
90
85
80
Pressure[Pa]
0
100
200
300
400
500
600
700
800
0 100 200 300 400 500
0.8 W/l/s
1.0 W/l/s
1.2 W/l/s
Air flow [m3
/h]
Heatrecovery
efficiency[%]
100
95
90
85
80
Technical data

4. 31
Parameters KOMFORT EC LB600 S11 KOMFORT EC LBE600-3 S11
Voltage [V / 50-60 Hz] 1 ~ 230
Fan power [kW] 0.34
Fan current [A] 2.2
Electric heater power [kW] - 3.0
Electric heater current [A] - 13.0
Total unit power [kW] 0.34 3.34
Total unit current [A] 2.2 15.2
Maximum air capacity [m3
/h] 940
RPM 1740
Sound pressure level at 3 m distance [dB(A)] 28-47
Transported air temperature [°С] -25 up to +60
Casing material aluzinc
Insulation 25 mm mineral wool
Extract filter cassette G4
Supply filter pocket G4 (F7)*
Connected air duct diameter [mm] 250
Weight [kg] 77 80
Heat recovery efficiency [%]** 81 up to 98
Heat exchanger type counter-flow
SEC Class A+
Heat exchanger material polystyrene
* Оption.
** Heat recovery efficiency is specified in compliance with the EN308 EU norms.
Pressure[Pa]
0
100
200
300
400
500
600
700
0 200 400 600 800 1000
0.8 W/l/s
1.0 W/l/s
1.2 W/l/s
1.4 W/l/s
Air flow [m3
/h]
Heatrecovery
efficiency[%]
100
95
90
85
80
Point
Unit power with no heater [W]
KOMFORT EC
LB300 S11
KOMFORT EC
LB400 S11
KOMFORT EC
LB600 S11
KOMFORT EC
LBE300-3 S11
KOMFORT EC
LBE400-3 S11
KOMFORT EC
LBE600-3 S11
1 83 87 87
2 96 145 145
3 124 247 247
4 134 299 299
5 45 79 79
6 48 103 103
7 60 143 143
8 73 217 217
9 20 28 28
10 22 32 32
11 25 41 41
12 27 56 56
Technical data