Expansion vessel
One primary vessel and multiple optional secondary vessels may be connected.
A membrane separates the vessels into an air and a water space, preventing the
penetration of atmospheric oxygen into the expansion water. The "VE" line
connects the air space with the atmosphere. The primary vessel is hydraulically
flexibly connected to the control unit. The function of the "LIS" level measuring
using a pressure pick-up is thus ensured.
Control unit
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.
Pressurisation
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 vessel, using the "EC" expansion line. The
pressure within the system drops. The pressure in the facility system drops when
the water cools. When the pressure drops below the set value, the "PU" pump is
activated and uses the "EC" expansion pipe to transport water from the primary
vessel back into the system. The pressure in the facility system rises. The
controller ensures that the pressure is maintained, further supported by the
stabilisation provided by the "MAG" pressure expansion vessel.
Degassing
Two "EC" expansion lines are required to degas the system water. One pipe is
intended for gas-rich water from the system, while one return pipe returns 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 vessel. 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). This process can be applied in three different variants (continuous,
interval or run-on degassing).
Make-up
When the water level in the primary vessel 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 time within a cycle
are monitored. Using a FQIRA+ contact water meter, the system monitors each
individual make-up quantity and the overall make-up quantity.
4.5 Scope of delivery
The scope of delivery is described in the shipping document and the content is
shown on the packaging. Immediately after receipt of the goods, please check
the shipment for completeness and damage. Please notify us immediately of any
transport damage.
Basic pressurisation equipment:
• The device on a pallet.
– Control unit and "VG" primary tank.
– Primary tank with accessories are packed on the tank base.
• "VE" aeration and de-aeration
• "DV" degassing valve
• Reducing sleeve
• "LIS" pressure pick-up
– Plastic sleeve with operating manual.
4.6 Optional equipment and accessories
The following optional equipment and accessories are available for this device:
• Heat insulation for the primary vessel
• Secondary vessels
– Accessories are packed on the vessel mounting
• "VE" ventilation
• "DV" degassing valve
• Reducing coupling
• Additional equipment with unsupervised-operation BOB-pipe for “TAZ+”
temperature limiter
• Fillset for make-up with water.
– Fillset with integrated system isolator, water meter, dirt trap, and
locking mechanisms for the "WC" make-up pipe.
• Fillset Impulse with FQIRA+ contact water meter for make-up with water.
• Servitec for make-up and degassing.
• Fillsoft for softening the make-up water from the potable water supply
system.
– The Fillsoft is installed between the Fillset and the device. The
device controller evaluates the make-up quantities and signals the
required replacement of the softening cartridges.
• Enhancements for the device controller:
– I/O modules for standard communication, see chapter 5 "I/O module
(optional expansion module)" on page 5 .
– Communication module for external operation of the controller
– Master-Slave-Connect for master controllers for maximum 10
devices.
– Combined switching to increase capacity and parallel switching of 2
hydraulically directly connected systems
– Bus modules:
• Profibus DP
• Ethernet
• Modbus RTU
• BACnet-IP
• BACnet MS/TP
• Diaphragm rupture monitor.
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