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General Instructions
8. Functional Elements
18
10
Schematic
Diagram
2
000
m
3
1
3
5
1 Water connection - R
1
/
" shutoff valve to
2
DN 2999 or 15 mm soldered. For
connection to the public water supply
main.
2 Water Meter
3 Changeover valve - normally closed -
for control of the backflow preventer.
4 Additional check valve in version for hot
water applications, for increased
protection of the drinking water.
5 R295SA-
1
/
" type 2 backflow preventer,
2
DVGW tested. Normally in shutoff
position. Changes over to the flow
position only when the level in the
expansion vessel falls below the lower
set limit.
6 Setting valve - adjustable for either fast
fill or refill of the system. Variable flow
quantity, corresponding to the curves
illustrated simply by adjustment of the
setting valve. During fully automatic
refilling operation, the setting must
always be on "Refill".
19
14
8
12
9
11
4
6
7
21
7 System connection - R
1
/
" shutoff valve
2
to DIN 2999 or 15mm soldered.
For connection of the downstream
system).
8 Terminal strip - for connecting the
individual electrical components.
9 Fill counter - Totals the number of filling
operations - Reset with a special key.
10 Time relay - To permit time limitation of
the filling cycle. Variable time settings
from 6 to 60 minutes filling time.
11 Discharge Tundish - for carrying away
small quantities of water during the
changeover operation. Connection for
DN 40 plastics pipe.
12 ON/OFF switch.
13 Connection for immersion electrodes -
Signal emitters for upper and lower
water levels.
14 Level monitor
15 Bush for cable connection to a building
maintenance system
22
12
17
11
14
Sens.k
B1
B2 B3
13
R
U
15
1
16 Pressure gauge - indicates the inlet
pressure of the supply
17 Cable connection for electrical supply
to the NA228S automatic refilling unit
18 Illuminated indicator button - lights up
when the set refill period on the time
relay is exceeded. The refilling
operation is then interrupted. When the
button is pressed, the time relay is
reset, the lamp goes out and the
appliance is ready for service again.
19 Pressure gauge - Indicates the
pressure in the downstream system. To
make accurate settings, a high
sensitivity pressure gauge should be
fitted in the downstream system.
20 Viewing window for indicating the
operating position of the backflow
preventer
(green visible = shutoff position)
21 Shutoff valve - for shutting off the inlet
pressure from the supply and to the
system
General Instructions
10
14
20
19
17
13
11
14
Sens.k
B1
B2 B3
R
U
18
15
21
11
7
2
16
23
9
6
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