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A hydrometer must be installed on the delivery line to monitor the pressure level and to
check if there is any leakage. The hydrometer should be purchased separately, and should
be installed at the same level with the boiler outlet.
A by-pass line should be installed between inlet and outlet connections of circulation pump in
order to allow water delivery when circulation pump is switched off and there is fuel fired in
boiler, particularly during sudden cuts off.
The optional safety heat exchanger kit is highly recommended to be used with the
boiler, even in the case of open vented systems to protect the boiler and the whole
heating circuit against excessive heat accumulation.
When water temperature in hydraulic circuit is relatively low, particularly when solid fuel is
just fired, it is common for water vapour in flue gases to condense. Condensation rarely
creates a problem for the boiler, as it will stop when boiler becomes hot. However, the boiler
should not be operated in fully condensing mode. When you open loading door, if chamber
walls are wet, it means that there is condensation in flue gases. Continuous condensation
does not only create massive tarr on combustion chamber heating surfaces, but also has
little effect on boiler lifetime. We recommend you to follow one of the following methods to
control condensation rate in the boiler:
1. You can install a thermostatic three way mixing valve between delivery and return line
of the boiler as described in above circuit scheme. Here, three way valve should
preferably be set to 40°C. Then, water will by-pass directly between delivery and
return of the boiler, until the return water temperature reaches up to 40°C.
2. You can control circulation pump by means of a thermostat that can be attached
delivery or return of the boiler. If thermostat is on the return line, it should be set to
40°C, if it is on the delivery side, set to 55 – 60°C. As the pump will not start unless
water temperature rise up to the set value, boiler warms faster, and condensation
mode is minimized.
4.2.1 PARAMETERS FOR DESIGN OF THE OPEN EXPANSION TANK
Expansion tank protects the hydraulic curcuit from
excessive temperatures by allowing free volume
for expanding water and keeping the water
pressure from exceeding the static pressure.
Expansion tank may be built in rectangular prism
or cylindirical shape, may be installed in horizontal
or vertical position in the system. Safety lines
between boiler and expansion tank should be
installed by an increasing slope up to tank.
Following scheme shows the maximum vertical
distances between safety lines and boiler:
The size of expansion tank can easily be
calculated regarding the total expanding water
contained in whole system. If the total volume of
water in the system is Vs; the volume of expanison tank should be:
Vg= 8.Vs / 100 (in liters)
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