22
THERM 90 KD.A
3.5.2 Graphs of the connecting overpressures of heating water (on the output for heating water)
Notice:
Curves of usable connecting overpressure values of the heating water are compiled for the
Wilo Stratos Para 25/1-8
pump to maximum regulation grade of the PWM control.
Due to the delivered output of the boiler and the resistance properties of the exchanger, we do not recommend
decreasing the output of the pump.
!
The piping system must be located to prevent the origination of air bubbles with the aim to make de-aeration
easy. The de-aerating elements should be mounted on all the highest located parts of the heating system and
also on all heating bodies.
Before testing and commissioning, according to ČSN 06 0310, the assembly must include perfect flushing of the
heating system up to fully clean status. To prevent the penetration of dirt into the boiler system, the entrance
of the return water from the heating system into the boiler must be fitted with a suitable filter and sludge
separator. It is necessary to clean and inspect the filter and sludge separator in regular intervals.
The heating system must be implemented in accordance with ČSN 06 0830 – Heating systems in buildings –
Security equipment and with ČSN 06 0310 – Heating systems in buildings – Design and assembly.
!
The producer requires:
mount into the slides of the pump filter and de-sludge equipment (e.g. Spirovent Kal)
mount a bypass valve in heating systems with thermostatic valves
install the valve in the lowest point of the system near the boiler for filling and discharging the heat-carrying
medium from the heating system and for sludge separation
mount de-aerating equipment on the output of the boiler and on the top point of the heating system
fit the hydraulic balancer of dynamic pressures at the outlet of heating water from the boiler and separate
thus the primary and secondary circuits regarding the hydraulics
!
The producer recommends:
to fill the system with soft water according to ČSN 07 7401
to separate the boiler on the input and output with a stop valve (see ČSN 06 0830), so in the case of inspection,
repair of the boiler or cleaning of the filter, it is not necessary to discharge the whole system
to remove the control levers from the valves during operation and secure against manipulation
3.5.3 Expansion tank
THERM 90 KD.A serie boilers are not equipped with an expansion tank of the heating system. The heating system is necessary
to provide with an external expansion tank with the volume specified in the heating project.
0
100
200
300
400
500
600
700
800
900
0.5
1
1.5
2
2.5
3
3.5
4
4.5
WILO
Connecting over-pressure THERM 90 KD.A
Water flow (m
3
/h)
Output over-pressure
(mbar)
