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Settings of safety relief valve (Psv)
* presssure of safety valve Psv should be about 0,5bar higher than operation pressure Pe; it is pressure inside
of system when is heated to its maximum; this condition suits for pressure Psv < 5bar; for pressure Psv > 5bar
suits Pe + 0,9 Psv
4) Heating system bleeding
Bleeding is carried out when heating system is filled, commisioning and operated
We recommend to comply wiht the following:
* during filling heating system do the bleedinf continuously
* final bleeding do with maximal operating temperature of heating water
* bleed at all bleeding points ca. 5 minutes after curculator is stopped
* repeat bleeding after a few days of operation
5) Heating system commisioning
Fill the heating system with permanent filling (modified by step 1) and after successfull leak test you could start
commisioning. We adhere to the following principles:
* first heating is needed to do with slow power increace
* bleed by the previous step
* make the operational tests in the agreed scope (between the investor and implementer)
6) Heating system operation
First heating season is mostly connected with heating test and regulation system. We recommend sticking to
these principles:
* check tightness of the system; do not fix defects by water adding
* check filters and clean up if needed
* drain system just in case of needed repair and keep empty for shortest possible time
* use antifreeze liquid as filling medium in case of danger of frost; do not drain the system
* periodically check and maintain all parts of system (circulator, boiler, regulating elements, expansion tank)
* check the heating water quality and add chemical substance if needed at the beginning of the heating season
Technical possibilities and chemical protection of hot water heating systems
Influence of hard, not modified water and related corrosion process in heatiting system is generally known. There
are a lot of manufacturers of "heating chemistry and equipments" for modification of heating water, anticorrosive
protection and cleaning of heating systems
Selection can not recommend the manufacturer. User and manufacturer are joinly responsible for selection,
method of application and technical effect. Select "heating chemistry" carefully and your selection consult with the
manufacturer. Proper selection can be made only if you know all parameters of heating system as hardness and
acidity of heating water, material composition of heating system (steel, copper, etc.), type of heating system
(gravitation system, forced circulation with expansion tank, floor heating, etc.). It is also important to abide dosing
for first and the following doses. Professional product should be supplied together with methodology for
determination of the actual concentration in water.
Heating water can be also modified by cation ion exchanger or by reverse osmosis, but it is economically too
denanding. Cause of the same reason is practically used for small systems only magnetic modification, which
prevent of limescale only.
Frequently asked question is how to put "heating chemistry" into system. Except resourcefulness of instalation
companies there are professional vessels for dosing.
Author of this part "Heat pump connection to heating system" of installation is: Ing. Josef Gulyás
Organization: KORADO a.s. Česká Třebová
