Degassing
In order to remove free and dissolved gases from the system water, these are directed in the partial flow across the ’variomat’
unpressurised diaphragm expansion vessel (VG basic vessel). Here gases (air) are eliminated from the water as a result of the
physical conditions.
During the degassing process, the pressure-maintaining pump and overflow device are working simultaneously.
Different variants of this process can be applied. A distinction is therefore made between continuous, interval and follow-up
degassing.
Water make-up
The ’variomat’ detects a lack of system water by means of the water level in the VG basic vessel. If the adjustable minimum
water level is fallen below, the water make-up device (solenoid valve) opens until the desired level is achieved again in the
expansion vessel.
During water make-up, the number of requests/time and the water make-up time during a cycle are monitored. If there is a
contact water meter installed, the individual and overall water make-up quantity can also be monitored.
Options
’variomat 2’ can be optionally extended. Various messages and signals can be prepared in addition to the default messages
using a retrofit add-on module. A communication module for remote control of the ’variomat’ controller can also be provided as
of 03/2002 (cable connection up to 1000 m). Bus modules (Lon...are available for linking up to the RS-485. This option must
be ordered separately as an accessory.
Operating parameters
Electrical data
Perm.
excess
op. press./
bar
Perm.
adv.
temp./
° C
Perm.
operating
tempera-
ture/° C
Perm. amb.
tempera-
ture/° C
Noise
level
approx.
dB
Electrical
output
kW
Soft
start
Degree
of pro-
tection
230 V 50 Hz
connection
variomat 1
reflex ’variomat’ single-pump system
variomat 1
10
120*
> 0 - 70**
> 0 - 45
55
0.75
No
IP 54
Shock-proof
plug, 5 m cable
variomat 2 - 1/60
10
120*
> 0 - 70**
> 0 - 45
55
1.10
Yes
IP 54
Power
switch, fixed
connection
on terminal
strip
variomat 2 - 1/75
10
120*
> 0 - 70**
> 0 - 45
55
1.10
Yes
IP 54
variomat 2 - 1/95
10
120*
> 0 - 70**
> 0 - 45
55
1.10
Yes
IP 54
reflex ’variomat’ dual-pump system
variomat 2 - 2/35
10
120*
> 0 - 70**
> 0 - 45
55
1.50
Yes
IP 54
variomat 2 - 2/60
10
120*
> 0 - 70**
> 0 - 45
55
2.20
Yes
IP 54
variomat 2 - 2/75
10
120*
> 0 - 70**
> 0 - 45
55
2.20
Yes
IP 54
variomat 2 - 2/95
10
120*
> 0 - 70**
> 0 - 45
55
2.20
Yes
IP 54
Perm. advance temperature of the supply system:
t
Advance max.
+ 120 °C
Min.
operating
temperature: t
min
- 10 °C
(only with appropriate anti-freeze additive)
Max. continuous operating temperature of the diaphragm:
t
max
+ 70 °C
Min. excess operating pressure:
p
min
0
bar
Max. excess operating pressure (depending on type):
p
max
→
name plate
Test
pressure
(prEN
13831):
TP
1.43
x
p
max
(AD
2000):
TP
→
design test report or name plate
Diaphragm
type:
Bladder
diaphragm
Gas space:
Air (fluid group 2 according to directive 97/23/EC)
Water space:
Water, water/glycol mixture with max. 50% glycol
(fluid
group
2
according
to
directive
97/23/EC)
Classification according to:
Directive 97/23/EC Appendix II, Chart 2
reflex ’variomat’
General description
29
Operating parameters
Technical data for the VG basic vessel/
VF secondary vessel
* In accordance with maximum possible setting value - temperature controller 105°C,
as per DIN EN 12828
** Installation in the system return, diaphragm load of the expansion vessels max. 70 °C;
for continuous temperatures ≤ 0 °C we ask that you consult us
Pump type
Number of pumps
Technical design
