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General Instructions
3. Scope of Application
The fully automatic NA228S-C refilling unit with its DVGW-approved component parts:
1
R295SA-
/
backflow preventer, DIN/DVGW No. 569VE
2
RV282-
1
/
check valve, DVGW No. 0572
2
permits permanent fixed connection of open heating systems to the drinking water
network. This applies particularly to heating systems to DIN 4751, Sheet 1.
The following operating data applies for the downstream systems:
Maximum system pressure:
4.0 bar
Maximum temperature:
100 °C.
4. Testing
The technical approvals of the NA228S-C fully automatic refill unit were obtained from TÜV
Bayern, Hessen, Sachsen, Südwest E.V. under No. AW-SEZ/408/97
The tests are based on the following DIN standards and worksheets:
DIN 3266, Parts 1 and 2
Tests for electrical and mechanical safety 1/EN 61010 - 1.3.1994 CE, low
voltage guidelines.
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5. Technical Data
Refilling:
Flow rate 110 litres/h at 2.0 bar differential pressure
Fast filling:
Flow rate finely adjustable between 110 litres/h and
1100 litres/h at 2.0 bar differential pressure
Duration of fill:
Adjustable between 6 and 60 minutes
(set at 12 minutes during manufacture)
Water level:
Signal emission by immersion electrodes for upper and
lower water level limits.
Electrode Spacing:
Approximately 200 mm
Water inlet pressure: Minimum 1.5 bar, maximum 4.0 bar
Supply voltage:
230V, 50/60 Hz
Supply voltage
for immersion
electrodes:
24 V~ 50/60 Hz; at level monitor
Electrical Load:
30 W
Dimensions:
Height - 380 mm
Width - 370 mm
Depth - 160 mm
Weight:
Approximately 16 kg
General Instructions
19
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