Supply air delivery
Minimum 350 m3/h air stream must be guaranteed in order to reach optimal operating parameters. For this purpose,
using air ducts of the same diameter as stub pipes in heat pump - ND150, the sum of two straight sections of air supply
and exhaust duct cannot exceed 10m. Flow resistance for a 90° elbow is the same as for 2m of straight section length. In
a conventional connection, when 90° elbows are provided both in intake and exhaust duct, maximum distance from
building wall is 2m. When heat pump location requires longer air ducts to be connected, a supporting fan or duct of larger
diameter must be installed. When we use smooth reducer, 1m of an ND150 duct may be replaced with 3m of an ND200
duct or 22m of an ND300 duct. The proposed selection of duct lengths and diameters applies to smooth pipes. Choke
valve (ventilation tee) turned to side position has the same resistance as 90° elbow, therefore we have 3 running metres
of duct left to use.
In case of using a duct made of spiral ventilation tube, ND150, maximum length of ducts is 5m each way.
All connections should allow easy disassembly.
Inlet air route should be provided with filter screen catching dusts and larger impurities. The filter should be regularly
cleaned. Filter soiling results in restricted air flow, which in turn deteriorates heat pump efficiency.
Extended ventilation set.
HEWALEX offer includes connection accessories.
Electric power supply
Heat pump should be powered with single-phase current 230V. Connect original power cable to an electric socket (cable
feeding the socket: min. 2.5mm2) with correctly made earthing (earthing resistance should not exceed 4Q). Remember
that the so-called neutralisation is not a correctly made protective zero.
The system itself should be protected with a B16 or C16 fuse.
Due to safety reasons, the installation should be protected by a 30mA residual current device.
Condensate discharge
Condensing steam from cooled air must be discharged into floor drain. Discharge line can be made using rubber hose
supplied in the set, or e.g. of any rubber hose if longer conduit is needed. Condensate discharge stub pipe has a 3/4"
coupler. Condensate discharge flow is generated by gravity only; therefore the system must allow free gravity flow. When
condensate discharge is connected with sewage system, water seal should be used in order to avoid fetid odours.
Condensate volume depends on air cooling scale and its humidity - few litres of condensate may be generated during
one-time tank heating. Condensate line stub pipe outside diameter is Φ16mm, and rubber discharge hose should have
the same inside diameter.
External control
The unit may be operated using an external control unit. In the strip, terminals marked ‘External control unit’ are
connected by a bridge. The Ext OFF message will be displayed in right bottom corner after their disconnection. The
‘External control unit’ option of the controller allows defining, which heating devices are to be operated by the external
control unit.
