The differential pressure switch DDS
is foreseen only for the use in air
handling installations with fixed air
intake and extract valves.
The connection of DDS and signal lamp must be
wired on site!
a) The installation of the DDS must
be vertical to the wall with the
pressure connections showing
downwards
b) The pipe connections of the DDS
must be connected to the air duct.
In this case the openings are to be
sealed professionally.
The pressure connection P2 (-)
is carried out at the outside air duct,
the pressure connection P1(+) at the
intake air duct.
c) Electrical connection see page 10.
fig. : Connection of differential pressure switch
3
wall fastening of
differential pressure switch
supply air
outdoor air
hose mounting
mounting height between 100 and 300 mm
connection hoses with
outdoor air on P2 (-)
and supply air on P1 (+)
see fig left
(right unit)
2
1
+
-
Ø 6
7
MOUNTING INSTRUCTIONS
Mounting Location of KWL EC 300 Eco
The unit is mounted indoors, in a place where temperature does not fall below +5 °C.
If installed within not heated areas (e.g. cock loft) a sufficient isolation on all sides is to be
mounted outside at the unit. Otherwise condensate formation at the casing sides could
occur. The condensate drainage must be laid frost protected.
The unit is to be mounted in a place where the sound pressure level coming through the
envelope is not acoustically disturbing (utility room, washroom, corridors, technical rooms,
stores, and in some cases rooms where people spend time).
The unit is mounted on the wall using the wall mounting plate included in the delivery.
Lift the unit to the wall making sure that the hooks on the back side of the unit attach to
the mounting plate.
The unit is splash protected (IP34), and can thus also be mounted in a damp room.
NOTE: Remove the transportation lock (wingnut) in the extract duct.
Before start-up, check the rubber aprons of the motors. They must be fitted correctly.
NOTE: The unit has to be mounted level with the vertical and the horizontal. (indispensable
for a correctly condensat drain).
Duct connections
The unit has four (diameter125) inner fittings equipped with rubber rings. Fix the ducts
steadily and tightly to the outlets. (
NOTE! Unit models L/R
). Implement insulation as defined in
the ventilation plan.
Electrical connections KWL EC 300 Eco
Only an authorized peson may perform the electrical 230VAC 50Hz connections!
An isolator is required for with a minimum of 3 mm contact opening of each pole.
The wire, approximately 1.5 m long, is located on the right side of the unit. Electrical
connections are internal wired. The cable which goes to the terminal box must be carry
through the membran gaskets.
Mounting 4-level operation switch
100 meters maximum lenght of the cable between 4-level operation switch and terminal box
Mounting location:
- the living quarters, circa 1,5 meters above the floor
- on a internal wall
- only for dry rooms
Differential pressure switch DDS (optional)
1. Mounting
Hooks on the back side of the unit
Wall mounting plate
Condensing water outlet below the unit
1
2
3
m
m
2. Function
The differential pressure switch DDS monitors the pre-installed outside air filter G4 and the
optional usable pollen filter F7 (intake air). It monitors the static pressure loss between out
side air and intake air duct. If the air flow volume is reduced due to dirty filters, the pressure
loss decreases between the two measuring points ( In the extreme case at V=0
Þ
D
p=P1-
P2=0 ).
A filter signal, for example a signal lamp can be build on site.
