Description of the device
— English Variomat 1 — 06.07.2016 – Rev. B
The control unit contains the hydraulic system and the controller. The "PIS" pressure transducer records the pressure and the "LIS"
pressure pick-up registers the level; both values are displayed at the controller.
The pressure in the system rises when the water is heated. When the pressure set at the controller is exceeded, the "PV" overflow valve
opens and drains water from the system into the primary tank, using the "EC" expansion line. The pressure within the system drops. The
pressure in the system drops when the water cools. When the pressure drops below the set value, the "PU" pump is activated and uses
the "EC" expansion line to transport water from the primary tank back into the system. The pressure in the system rises. The controller
ensures that the pressure is maintained, further supported by the stabilisation provided by the "MAG" expansion tank.
Two "EC" expansion lines are required to degas the system water. One line is intended for gas-rich water from the system, and the other
one serves to return the degassed water to the system. During the degassing action, the "PU" pump and the "PV" overflow valve are in
operation. This transports a gas-rich partial flow of the system water V through the de-pressurised primary tank. Atmospheric pressure is
used to separate the free and dissolved gases and to discharge them through the "DV" degassing valve. The controller ensures the
hydraulic equalisation by regulating the stroke of the "PV" overflow valve (motor ball valve). There are three different modes for this
process: continuous, interval or run-on degassing.
When the water level in the primary tank falls below the minimum, the "WV" make-up valve opens until the set level is again reached.
During the make-up process, the number of requests, the time and the make-up duration within a cycle are monitored. Using a FQIRA+
contact water meter, the system monitors each individual make-up volume and the overall make-up volume.
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