Operating instructions
2.2 Condensation outlet
The humidity of exhaust air condenses to water during the heating period. A lot of condensate can build up in new buil-
dings with large numbers of people. The condensate water collected in the condensate tub made of stainless steel is
discharged via a ball siphon (not included in scope of delivery). An incline of at least 3° (Fig.4) must be observed and
the connection to the local drainage system must be ensured on site.
An open outlet should be connected (see design Fig. 4) due to odour development in dried-out siphons.
The drainage pipe route must not rise above the siphon!
The condensation outlet must be made frost-proof!
2.3 Flange connection / adapter pieces
KWL EC ... Pro / WW types are supplied with a flange connection as standard
Adapter pieces for ducts and piping are available from Helios:
The piping must be firmly and tightly connected to the connection valves. Refer to the illustrations for the
arrangement of ventilation ducting.
2.4 Air ducting, Ventilation circuit
When designing the ductwork, use the shortest possible runs. Airtight connections and changeovers must be ensured
for the best possible heat recovery. To avoid pressure losses, dirt build-up and noise, use smooth ducts (plastic or rigid
ducting). For main lines (outside, exhaust air, supply air distributor, extract collector) DN (KWL EC 700 D = 250 mm;
KWL EC 1400 D = 315 mm; KWL EC 2000 D = 400 mm) or the corresponding duct is to be provided, and the ø is
reduced accordingly for branch lines.
Exhaust and outside air pipes are to be insulated in an appropriate way to reduce condensation. The minimum insula-
ting thicknesses pursuant to DIN EN 1946-6, 05/2009 are to be observed. If supply and extract air ductwork runs
through unheated rooms, insulation must be provided to reduce heat losses. Fresh air should be supplied to living and
bedrooms and extraction should take place in bathrooms, toilets and kitchens. To balance the whole system, supply
and extract openings should be provided with adjustable valves (accessories).
A filter (accessory) is to be connected for the extraction of polluted extract air. The installation of extractor hoods to the
system is not permitted (reasons: dirt, fire danger, hygiene). Sufficient overflow openings (door gap, door grilles) are to
be provided to ensure air circulation within the room.
All fire and building regulations must be observed!
6
Central ventilation units KWL EC 700/1400/2000 D Pro / WW
Installation and operating instructions
Unit type Description Order No. Pipe diameter in mm
Fig.6 KWL EC 700 D.. KWL-ÜS 700 D 4206 250
Fig.7 KWL EC 1400 D.. KWL-ÜS 1400 D 4207 315
Fig.8 KWL EC 2000 D.. KWL-ÜS 2000 D 4208 400
Unit type Dim. K L
KWL EC 700 D ... mm 224 324
KWL EC 1400 D ... mm 274 524
KWL EC 2000 D ... mm 324 624
fig.4fig.3
fig.5
K
L
Dim. in mm
Condensation
outlet drains,
Ø 22 mm
Condensation outlet
L
H
J
IHJ
J
F
F
L
F
I
M
F
È GF
K
H
J
HMJ
I
G
K
L
F
I
H
F
È GF
IHJ
HHJ
HKF
JF
H
K
F
È
GF
fig.6 fig.7 fig.8
ATTENTION
Incline min 3°
NOTE
☞
ATTENTION
UK