58
higher hardness does not prevent the salts from precipitation on the walls of the boiler drum. The
precipitation of 1 mm of calcite in a given place reduces the heat transfer from metal to water by 10 %.
Heating systems with an open expansion tank allow the direct contact between the heating water and
atmosphere. During the heating season the water expanding in the tank absorbs oxygen which
increases its corrosive effects and at the same time a considerable volume of water evaporates. Only
water treated according to
Č
SN 07 7401 can be used for refilling.
The heating system must be thoroughly flushed in order to wash out all impurities. During the heating
season it is necessary to keep a constant volume of water in the heating system. Refilling the heating
system with water must be done carefully in order to prevent air sucking into the system. Water in boiler
and heating system must never be discharged or taken for use with the exception of exigencies such as
the repairs etc. By water discharging and new water filling the risk of corrosion and scale formation is
increased
.
If it is necessary to refill water in heating system we only refill the cooled down boiler in order to
prevent the steel basement and cast iron heat exchanger from damage.
b) heating system tightness
c) connection to the chimney - it must be approved by a chimney-sweepers’ company
d) burner tightness
Connect the equipment to the mains (insert the plug into socket). Put the main switch (circuit breaker) in
the service box into the 1 position. By starting the ventilator (by pressing the blue button) in the service
box the burner tightness is checked. All air must flow into the combustion space of retort and cast iron
grate. The check must be focused on bearing surfaces:
-
of ventilator to the flange
-
round the burner cleaning hole
-
of the cast iron grate with burner. In case a leakage appears the grate must be removed, the old
boiler mastic must be removed from bearing surfaces and an adequate quantity of new mastic
must be applied to them; then the grate is remounted into burner.
(Note: In front view to boiler the
grate trimming must always be to the rear wa
ll
.)
Repeat the check.
By pressing the blue button again the ventilator is switched off. If you do not switch off the ventilator it
will be switched off automatically after 15 minutes (unless there is some requirement from QAA 88
device).
e) connection to the mains
The boiler is connected through a movable lead by means of a plug into the standardized socket 230
V/50 Hz/10 A. Protection against electric shock must be ensured according to
Č
SN 33 2000-4-41.
f) draught regulator in the automatic regime must be taken out of service
g) open the water inlet into valve BVTS or TS 130 or STS 20
h) check the opening of chimney flap
The installation and heating test completion must be recorded in the „Guarantee certificate“.
!
Apply boiler mastic to the point
marked with caterpillar and put the
grate on the retort with mixer. It is
necessary to ensure the tightness
between the burner and grate.
