Viadrus GRAND G 36, Manual For Operation And Installation

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5. Electric connection of the room thermostat for the version with SIT valve will be realised
according to Pict. No. 3. The cable will be lead to the electric panel, one conductor will be connected to
boiler thermostat terminal placed at the console, (a conductor at this terminal must be disconnected). The
second conductor will be lead to the gas valve (the joints must be soldered and fitted by gold connectors).
The cable must be long enough in order that one conductor from the electric panel reached the gas valve.
Any connection of the conductors is undue.
6. Connection to gas. Gas is connected to boiler through the gas spherical closing cock.
7. Filling the heating system with water. The heating system must be thoroughly flushed out in order to
wash out all impurities that can be deposited in distribution system or in the radiators and cause the pump
clogging.
Water for filling the boiler and the heating system must be clear and colourless, with no suspended
materials, oil and aggressive chemicals. Its hardness must comply with
Č
SN 07 7401 and in case that the
water hardness doesn’t comply with this standard it must be treated. Even heating the water with a higher
hardness several times does not prevent the soils from getting precipitated on the boiler drum walls.
Precipitation of 1 mm calcite reduces at a given point the heat transfer from the metal to water by 10%.
The heating systems with an open expansion tank enable a direct contact between the water and
atmosphere. During the heating season the water expanding in the tank absorbs the oxygen which
increases the corrosive effects and at same time water evaporates significantly. For a refill there can only
be used water treated to the values according to
Č SN 07 7401.
8. Bleed the heating system.
9. The boiler must be properly grounded at the grounding terminal of the boiler body.
10. The plastic foil, wooden pallet and cardboard packing after boiler unwrapping must be thrown out into the
waste containers intended for this purpose.
During the heating season the water volume in heating system must be kept constant and the heating system
has to be blown through. Water from boiler and the heating system must never be discharged or taken for
usage except for the emergency cases like repairs etc. Water discharge and filling with new water increase
the danger of corrosion and scale development.
In case we have to refill the heating system with water we only refill a cold boiler in order to prevent the
boiler sections from disruption.
7. Commissioning- instructions for contractual service organization
The boiler commissioning, heat output setting and any interference with boiler electric part or
connection of additional control elements can only be done by a contractual service organization
authorized to do these activities.
7.1 Verification activities before commissioning
Before the boiler commissioning it is necessary to check:
a) Filling the heating system with water (check the manometer).
b) Adjustment of thermostats:
-
Boiler thermostat 70 °C
- Burnt gases thermostat 70 °C
c) Input pressure of gas before the boiler and bleeding of gas feeder
d) Connection to chimney