9
Volume of pressure vessel should be equal at least 4% volume o water in the entire heating
installation.
NOTE: Ascending and descending safety pipe as well as circulation pipe must not be
equipped with any valves. In addition, those pipes and the pressure vessel should be
protected against freezing.
In the front upper part of insulation there is G 1” connector for thermometer. If
thermometer will not be mounted on it, this connector should be plugged. Boilers of SAS
NWT type may work with gravitational or forced water circulation. If installation is provided
with circulation pump, than on feeding/return pipe the differential valve should be installed.
When blackout or pump malfunction occurs, this valve will open and the system start work
running by gravitation.
NOTE: It is recommended to connect the boiler to heating system provided with three-
or four-pass valve. The main advantage of such connection is boiler protection function
against low temperature corrosion, preventing it from premature wear.
If not satisfactory to comply with manufacturer’s recommendations in reference to
maintaining given heating water temperature ranges occurs (table TECHNICAL –
EXPLOATATION PARAMETERS p. 11-12, point 12, 13 it concerns in particular long-
lasting return water temperature below 55°C), then the boiler should be connected to the
heating installation equipped with three- or four-pass valve protecting it against low
temperature corrosion.
6.5.
CONNECTING BOILER TO ELECTRICAL INSTALLATION
Boiler room should be equipped with electrical installation 230V/50Hz should be
according to detailed regulations being in force in the country of destination.
Electric socked should be earthed. Grounding functionality should be checked. Cable
extensions are forbidden. Faulty installation may cause the controller to be destroyed or be
unsafe for the user. Controller and other cooperating devices are powered with 230 V,
therefore all connections shell be made by qualified personnel (certified electrician).
NOTE: Electrical cables of powered devices should be placed away from boiler’s
parts, which tend to be hot during exploitation of boiler ( cover of the upper
washout hole, smoke conduit, door).
7.1.
FILING WITH WATER
Boiler and the entire installation water filling is to be performed using blowdown connection.
This activity should be performed slowly allowing the air residing in the
installation to be removed. It is accomplished when water is going out of overflow pipe.
When filling the heating system installation with water it is recommended to loose
screw connection at the place of boiler – installation assembly (on the hot water
connector). Once water is flowing out, tight the connection.
7. OPERATION AND EXPLOITATION GUIDELINES
