BTA User Guide
Topling Prnjavor
Page 39
of the water level in the exclusion of one of the systems, each can be separatelly linked to the
expansion vessel. In the event that group of several systems need a possibility of closure in the
distribution connection for each in the return line, then for each of those systems one own
security distribution or return line (or both) must be set up so that a connection between
disitribution and return line of each of these systems and expansion vessel is provided.
Insurance for group system can be implemented as for a single system if the security
cable is dimensioned according to the total boiler group performance.
In each open hot water heating system the expansion vessel must be at the highest point
of the whole plant. The expansion vessel is usually placed vertically above the boiler. If this is not
possible because of the construction, then the total extension of the safety lines shall not exceed
ten times the value of vertically derived part of the boiler safety line.
In order to ensure the circulation of water in the expansion vessel for open facilities, one
connection line of the given diameter of 20 mm (internal tubing diameter with built-in device for
damping) shall be provided between the distribution line and the lower part of the expansion
vessel or its connector for safe return line.
Diameter of mouth of vent and overflow pipe shall be at least equal to the diameter of the
safety distribution line, but must not be less than 25 mm. Overflow line must end in the boiler
room with the open end, and in such a place that it can be monitored. Vent and overflow pipe
must not be taken out. Overflow pipe can also be used as a vent pipe, if a curved branch is
expanded in the level of expansion vessel.
Summary of Contents for BTA1000
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