18
•
To cool the heating system to the room temperature;
•
To draw off 20 liters of water from the system, to dissolve a dose of the
“Galan-Protektor” in this volume of water (1,5 liters of inhibitor per 100 liters
of water), to stir carefully, and to fill the heating system with this mixture
through the drain valve by means of the “Malysh” type pump. Draw off 20
liters of water from the system once again and fill the hating system with
water without inhibitor. Perform these tasks up to the complete filling of the
heating system with mixture of water and inhibitor. For washing the system it
is necessary to keep it working through 6 days with the temperature of the
return pipe of +35
º
C. During this period the washing of the system and the
corrosion protection (inhibition) of the external surfaces of the system take
place. At this time it is necessary to clear the filter periodically.
After six days of operating the heating system it is necessary:
•
To disconnect the heating system from the power network;
•
To cool the heating system to the room temperature;
•
To draw off water from the heating system completely.
This water cannot be reused. If required, the procedure can be repeated. It is
necessary to examine and check the tightening of the bolted and electrical connections, and
the reliability of grounding connection.
Boiler repair
Remove the boiler from the heating system. Remove the electrode group (electrode)
from the boiler case. Decontaminate the internal surfaces of the boiler. Be convinced of
absence of any defects.
It is necessary to perform the following tasks in the course of the boiler repair:
•
Remove an electrode (of the single-phase electrode boiler) or electrode group
(of the three-phase electrode boiler) from the boiler case. Electrode or
electrode group should be inspected for absence of defects (cracks of the
bushing insulators, etc.) and for evaluation of electrodes wear. In case of a
wear comprises more than 40%, the electrode (electrodes) should be
replaced. Traditionally, this happens every 3-5 years.
•
Clean the mating surfaces carefully for providing leak resistance which is
achieved by applying sealing materials in the course of the boiler assembly
and its further operation.
•
Give the internal surfaces of the boiler case a mirror-like polish. The internal
surfaces should be inspected for absence of defects (such as point corrosion,
etc.).
•
Assemble the boiler. The boiler assembling should be performed with
scrupulous attention to alignment between electrodes and to alignment
between electrodes and the boiler case. By this is meant that equal spacing
should exist between electrodes and between electrodes and the boiler case.
Exclude the ingress of contamination into the boiler in the course of the boiler
assembling. Check leak resistance of the boiler.
Install the boiler only vertically into the heating system. Fill the heating system with
heat-transfer agent. The surge tank should be one-thirds full of the heat-transfer agent.
On completion of the tasks listed above it is necessary to check leak resistance of the
heating system, tightening of the bolted and electrical connections, reliability of grounding
connection, value of the electric resistance of grounding, and reliability of automatics.
Perform a trial start of the heating system. Correct the detected malfunctions as may be
required.
A person responsible for performing these tasks should make an entry in the List of
the performed maintenance functions, assure it by his own signature and by the seal of the
firm (organization) and to write the address and license number of the firm (organization)
(Appendix No. 2).
“Galan-Potok” low-freezing liquid as a heat-transfer agent
In this case the preventive maintenance of the boiler is performed one in every three
years between the cold seasons. The examination and checking of the tightening of the
