Description of the device
Variomat Basic
—
22.07.2020 - Rev.
A
English
—
5
4.3.2
Type code
No.
Type code (example)
1
Control unit
designation
2
Number of pumps
Variomat VS 1, VG 500 l, VF 500 l
3
"VG" primary tank
1 2 3
4
5
6
4
Nominal volume
5
"VF" secondary
tank
6
Nominal volume
4.4
Function
1
Heating system
WV Make-up valve
2
"MAG" expansion
vessel
PIS Pressure sensor
3
Reflex Fillset Impulse
PV Overflow valve (motor ball
valve)
4
Control unit
PU Pump (pressurisation)
5
Hydraulic inlets
SV Safety valve
6
Primary vessel air
space
EC Expansion pipe
7
Secondary vessel air
space
FD Feed and drain cock
ST
Dirt trap
LIS Pressure load cell
FQIRA+ Contact water meter
DV Degassing valve
WC
Make-up pipe
VE Ventilation
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 5.1
"Technical data" on page 6 .