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bolted and electrical connections, and the reliability of grounding connection are performed
yearly.
A procedure of performing the preventive maintenance is similar to the procedure
described above which is performed in case of using water as a heat-transfer agent with the
exception of washing the system that is not performed and with observance of the safety
measures.
The washing of the system is not performed because the “Galan-Potok” low-freezing
liquid contains rust prevention additives and components against formation of scum and
scale.
It is necessary to clean the boiler and its components of low-freezing liquid carefully
by flushing with water before performing the boiler repair.
Visual examination of the boiler operation
This task can be performed by the instructed persons no younger than 18 years old.
These specialists should be acquainted with the given Operation manual and the boiler
construction.
It is necessary to monitor the volume of the heat-transfer agent in the heating
system by its level in the surge tank during visual examination of the boiler operation. The
surge tank should be one-thirds full of heat-transfer agent under normal conditions. If level
of the heat-transfer agent in the surge tank is lower than the specified volume a specialist
of the firm (organization) serving a system should perform one of the following procedures
depending on a kind of the heat-transfer agent:
a)
Water as a heat-transfer agent. Add distilled water, clear uncontaminated
filtered rain water or snow melt water (water the specific electric resistance of
which significantly exceeds 3100 Ohm/cm) to the surge tank until a normal
level will not be reached.
b)
Low-freezing liquid as a heat-transfer agent. Add distilled water, clear
uncontaminated filtered rain water or snow melt water (water the specific
electric resistance of which significantly exceeds 3100 Ohm/cm) and low-
freezing liquid in the 3:1 ratio to the surge tank until a normal level will not
be reached. It is necessary to disconnect the heating system from the power
network to perform this task.
The boiler should be switched off immediately in the following situations:
•
Voltage absence;
•
Heat-transfer agent leak;
•
Presence of the frozen heat-transfer agent;
•
Grounding malfunction;
•
Appearance of moisture on a boiler shell or on the automatic equipment;
•
Circulation pump malfunction.
In case of heating system malfunction you should call the specialists of the firm
(organization) serving your heating system. Before their arrival you should act according to
the given instructions.
In case of threat of “unfreezing” of the heating system you should draw off the heat-
transfer agent (water) from the heating system to the clean container.
Annual tasks providing electrical safety and reliability of the automatics
Annually after the ending of the cold season it is necessary to perform the tasks
providing electrical safety and reliability of the automatics irrespective of the kind of the
heat-transfer agent which is used in the heating system (water or low-freezing liquid). It is
necessary to disconnect the heating system from the power network to perform the
following tasks providing electrical safety and reliability of the automatics:
•
Checking the reliability of the grounding contacts and the automation unit;
•
Checking the value of resistance of the heating system grounding. This value
should be no more than 4 Ohm.
•
Examination of the automatic switch which includes dusting, terminal
connections checking, terminal connections tightening, electrical contacts
checking.