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above should be acquainted with the “User and safety rules for operating electric boilers and
boiler-houses” and the given Operation manual. In the process of working with rust
inhibitor, low-freezing liquid, washing and clearing agents it is necessary to follow the safety
rules for using these substances. On completion of the tasks listed above the organization
(firm) which has performed these tasks should make an entry in the List (Appendix No. 2)
which is assured by the person responsible for performing these tasks and by the seal of
this organization.
Visual examination of the boiler operation can be made by the instructed persons no
younger than 18 years old. These specialists should be acquainted with the given Operation
manual, the boiler construction, and safety rules for visual examination of the boiler
operation.
Connecting the boilers to the power networks of the supply authority
In case of the lack of the allocated power the boiler connecting is performed in
accordance with the established procedure.
It is necessary to note that this procedure of connecting the electric boilers to power
networks is applied to the electric boilers of other types and is not the distinctive feature of
the electrode boilers.
Grounding
By the time of boiler installation the heating system should have the completely
accomplished and tested grounding. The value of resistance of the boiler grounding and the
value of resistance of the heating system grounding should be no more than 4 Ohm. The
copper wire with the cross section of 4-6 sq. mm is used as the conductor for the grounding
(Table 1).
The arrangement of the protective grounding should meet the requirements of the
“Inter-branch rules for electric installations” and the “User and safety rules for operating
electric boilers and boiler-houses”.
All of the open current-conducting parts of the boiler and heating system including
metal pipelines for the cold (return pipe) and hot heat-transfer agent should be grounded.
The place of entering of the conductors into the building or construction should be
marked by the identification sign.
Grounding electrodes
The construction of the grounding electrodes should meet the requirements of the
“Inter-branch rules for electric installations”.
The construction and arrangement of the grounding electrode should provide the
required value of resistance of the boiler grounding and the value of resistance of the
heating system grounding which is no more than 4 Ohm.
The periodical review period of grounding electrode state comprises 12 years.
The rusting wear should not exceed 50%.
It is forbidden to paint the grounding electrode and to safeguard the grounding
electrode against rust by means of the removable or permanent dielectric coating (for
example, rubber or plastic cover).
Before the installation procedure it is necessary to examine the boiler and to check
the completeness of the equipment.
The boiler is installed only vertically into the heating system.
A terminal group (current leads of the boiler) protected from the external influence
or casual touching by the protective housing should be located at the bottom of the boiler. A
phase terminal of the “Ochag” (220 V) electrode boilers should be located at the bottom of
the boiler. It is necessary to use couplings for connecting the boiler connections to the
pipelines of the heating system. A nominal diameter of these couplings should meet the
project documentation requirements of your heating system and should be no less than the
nominal diameter of the boiler connections.
In the course of the heating system designing it is necessary to install the boiler as
low as possible in relation to the radiators. This increases a pressure on the boiler outlet. It
is desirable to allow vertical clearance for easy removing the electrode group from the boiler
and for visual examination and cleaning of the internal surfaces of the boiler.
