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2.3. Water pipes connection
A. Water pipes mounting
Before mounting, remove all the residues and impurities from inside the water pipes so as to ensure
the normal operation of the electric heating unit.
Assemble in the order indicated in Subchapter 4.1.
Connect the drain tube of the safety valve to the floor discharge tube or to the sewerage pipe to
avoid water discharge on the floor in case overpressure arises in the heating system. Otherwise, the
unit's supplier undertakes no responsibility for inundations produced as a result of the valve's
operation.
In the case of a heating system provided with thermostat valves, the water circulation may be
completely interrupted. In such a case, a by-pass will be mounted. The by-pass should have an
adjustable differential or should be correlated with the circulating pump's operation stages.
B. Water quality in the hydraulic system
In the case of water with a hardness above 25ºFr, use demineralized water to avoid the formation of
deposits inside the electric heating unit as a result of hard and corrosive water. It was found that
even deposits with thicknesses of only a few millimetres may lead to decreased efficiency of the
heat exchange, and, as a consequence, the unit's overheating thus causing serious problems.
In the case of a large system (large water content) or of a frequently fed system, water treatment is
compulsory. In case partial or complete system's discharge is needed, use only properly treated
water.
C. Frost protection system, heat carrier, additive and anti-frost inhibitor
The electric heating unit is provided with frost protection function. If the water temperature inside
the heating system decreases below 5ºC, the antifreeze mode is activated.
If the electric heating unit is no longer connected to the power supply system, the frost protection
function is annulled.
If necessary, you may use a heat carrier, an additive or an anti-frost inhibitor. However, the provider
of such agents should guarantee that such products do not impair the heat exchanger, the auxiliary
components and the heating devices of the electric heating unit. Do not use heat carriers, additives
or anti-frost inhibitors which are not indicated as compatible with the heating devices and with the
electric heating unit.
Check and clean the filter and the collection device on a regular basis. Before filling the heating
system with water, check the pressure inside the expansion vessel. Restore the expansion vessel's
air cushion to 0.9-1 bar, if necessary.
2.4. Performance of the electric connections
Electric cable connection
To connect the unit to the power supply system, the user should have obtained the approval from the
area's electricity supply company and check the unit's connection characteristics which should be
the same as the specifications mentioned within the connection approval. The installed electric
power capacity should not exceed the value provided within the authorization.
Before installing the unit, you should have a supply electric cable installed and provided with a main
switch and an overload circuit breaker, inspect the said cable and have an approval to connect the
new consumer.
The electric heating units are included in the category of devices permanently connected to the
power supply source. The unit's fixed supply cable should be provided with an integrated main
switch. The unit is connected through proper cables to the connection strip.
Before mounting the protection bolts, clean both sides and exterior walls of the housing as well as all
the areas close to the bolts through their metallic surface. Inside the housing, under the bolt heads,
insulate the conductors using terminal sleeves for cables. Tighten the connection inside by means of
a copper nut provided with locking washer. Use another such nut to connect the second protection
cable.
When connecting the power supply cable, make sure that all the nuts of the electric terminals and
contacts are properly tightened.
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