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- after the system cools down to 40°C, empty the wash-out water keeping all regulations concerning
wastewater,
- clean filters from mechanical dirt,
- start filling the system with the permanent contents immediately.
3) Pressure expansion tank parameters setting
The chosen volume and pressure parameters of the expansion tank are important for long-term failure-free
operation of the heating system. The requisite volume of the pressure expansion tank is determined by the ÈSN
06 0830 standard. Insufficient volume and unsuitable pressure rates of the expansion tank cause repeated airlock
and corrosion of the heating system. Correct volume of expansion tank should be authenticated by the designer
of the heating system. The installation company is recommended to set the pressure parameters as follows.
These parameters should be checked by the user once a year.
Gas overpressure (Pn) in the expansion tank:
- when setting the gas overpressure, the expansion tank must be empty (without water),
- pressure (Pn) should be 0,2 bars higher than the static height of water column (Pst) of the heating system
(vertical distance between the expansion tank and the highest point of the heating system: 1m = 0,1 bar).
Filling water pressure setting (Pf):
- by opening all regulation valves, the system is filled without problems,
- pressure of the filling water (Pf) should be 0,3 to 0,5 bars higher than the gas pressure (Pn) in the
expansion tank. Filling water pressure is controlled during cold conditions by manometer on the water site
after deaerating.
Protective pressure setting (Psv):
- protective pressure (Psv) should be about 0,5 bars higher than the operation pressure (Pe) of the
system which is heated to operation maximum. This is valid when the protective pressure Psv < 5 bars. If
Psv > 5 bars then Pe + 0,9 Psv.
4) Deaerating of the heating system
Deaerating is a process which is repeated during filling, start-up and operation of the heating system.
Following rules are recommended:
- during the filling of the heating system, perform deaerating continuously,
- final deaerating should be done at maximum operation temperature of the circulating water,
- perform deaerating after 5 minute pause of the circulating pump on all deaerating loactions of the
heating system,
- repeat deaerating after a few days of operation.
5) Start-up of the hydrothermal system
The system is filled with permanent filling (treated water as specifies in point 1). It is possible to start the heating
system and after a successful test of the sealing.
The following rules must be kept:
- the first heating-up must be done at slow capacity start of the heat pump,
- deaerating is performed according to the instructions described above,
- operation tests are made according to the range agreed between the investor and the installing company.
6) Operation of the heating system
The first operation season is usually connected with the heating test and with regulating of the whole system.
The following tests must be performed:
- check the tightness of the heating system, do not solve the defects by refilling the lost water,
- check filter clogging and clean filters if necessary,
- drain the system only during necessary repairs and let it empty only for the shortest period,
- in danger of the system freezing, use the anti-freeze and do not empty the system,
- check and maintain the single elements (pump, boiler, regulation components, expansion valve) regularly
according to the user guide,
- prior to the beginning of each heating season, check the quality of the circulating water and refill
the appropriate chemicals if necessary.
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