Heat and Comfort
21
expansion vessel must be positioned in such a way as to prevent it from getting
heated up due to exposure to radiant heat.
2) Each heating system must be executed to ČSN 06 0830 (Safety Equipment for
Central Heating and Heating of Utility Water), fitted with at least a single
reliable safety valve located on the outgoing line or on the boiler and a
manometer (pressure gauge). The positioning, assembly and clearance of the
safety valves must conform to ČSN 06 0830.
3) When fitting the safety valve in, the valve must be checked for correct setting
though an overpressure of 180 kPa, at which the safety valve must open. In the
event of inappropriate setting of the safety valve, a new adjustment must be
provided.
4) The assembly and adjustment of the safety valve with a test and gas pressure
adjustment in the pressure expansion vessel may only be carried out by an
authorised company. Before filling the system with water, gas pressure in the
pressure expansion vessel must be measured to find out if it exceeds the
hydrostatic height in the system.
5) The heat source must, besides other things, be fitted with elements specified by
ČSN 06 0830 and ČSN EN 303-5 and, for solid fuel boilers, with a draft
controller. The highest operating temperature is restricted to 90
o
C.
6) The pressure expansion vessel and the supply line must be protected against
freezing of the contained water.
7) The gas filling overpressure value in the expansion vessel must be adjusted by
discharging it down to the value of the system’s cold hydrostatic pressure. The
discharging must be done via the tyre valve provided on the expansion vessel
and the overpressure shall be identified by a manometer used for tyre pressure
measurements. By replenishing the system with water, adjust the pressure to a
value higher by maximum 10 kPa compared to the hydrostatic height in the
system.
8) After the system has been filled with water, mark the as-adjusted hydrostatic
height and max. pressure in the system after the water temperature has risen to
90°C by devising lines on the manometer scale.
9) If, during the operation, changes of such difference occur, judging by the
indicated scale lines, that the minimum or maximum pressure values are
exceeded, the system must be checked, properly deaerated, replenished with
water in the cold state and/or re-pressurised in the pressure expansion vessel as
instructed by the manufacturer.
10) In the event a pressure expansion vessel is used, the biggest height of the
water column in the heating system must be 12 m.
11) For each pressure expansion vessel, an external check must be done at least
once a year, coupled with a check of the filling pressure.
12) Each heating system must be provided with a drafted and approved project and
the equipment must be connected to a surplus heat removal line as indicated in the
figure and the boiler assembly and connection must proceed accordingly.
13) For an appropriate pressure expansion vessel, the actual pressure differential
must not exceed 60 kPa at water temperatures in the system ranging from 10 to
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