User manual HONEYWELL NA 228 S-C

[. . . ] NA 228 S-C Automatic refilling unit for open heating systems Product specification sheet Application The NA 228 S-C automatic refilling unit with DVGW-tested backflow preventer permits the fixed connection of open heating systems to the drinking water supply network. [. . . ] Special Features q 30 Watt 4 GRÄSSLIN 2 0 bar 6 8 h UWZ 52 220V~50Hz vom Kal twa sse rne tz 5 SPX 1996 10 15 0 bar 16 Nachfül 8 NA 22 at Typ: lautom / DVGW Hz TÜV ~ 50/60 230V Components DVGW-approved Electrical changeover valve for control of the backflow preventer Supplementary hot-water-resistant check valve for increased protection of the drinking water network Setting facility for fast filling or refilling of the system Time relay, for limitation of the refilling period Standardised discharge connection Remote volt-free connection for electronic level probes and mass cable Bush for cable connection to a building management system Circuit protection for volt-free connection Water meter, measures the refills Electronic level probes for level monitoring q q q q q Construction The automatic refilling unit comprises: q q q q q q q q q q q q q q Powder coated pressed steel housing Drinking water and system connection with shutoff ball valve Counter with reset key Electronic time relay Fault indicator lamp and cut-out button Pressure gauges for inlet and system pressure Discharge tundish ON/OFF switch 1. 5 metre plug-in connection cable Water meter Bush for cable connection to a building management system Level control Electronic level probes Electronic level probes connection and 1 metre mass cable connection prepared q q q q q Range of Application The following operating data applies for the downstream system: System pressure Maximum 4. 0 bar Temperature Maximum 120 ºC Technical Data Flow rate 110 litres/h at p = 2. 0 bar Flow rate finely adjustable between 110 litres/h and 1100 litres/h at p=2. 0 bar Filling duration Adjustable between 5 and 100 minutes Water level Upper and lower level indicated by electronic level probes Probes distance approx. 200 mm Water inlet pressure Minimum 1. 5 bar, maximum 4. 0 bar Remote connection 220 V, 50/60 Hz to activate compressor level indicator switch , , lack of water" Volt-free contact Supply voltage: 230V, 50/60 Hz Power consumption: 30W Connection size: R 1/2" and Ø15 229 Refilling Fast filling * For temperatures above 100 ºC, the pressure at the highest point in the cold system must be at least 1. 0 bar above the operating pressure (static height plus 1. 0 bar). Subject to change 03/99 Automatic Refilling unit NA 228-SC Method of Operation If the system pressure falls below the lower set value, for example through leakage losses, then the changeover valve is opened by electronic level probes control and thereby permits water supply to the backflow preventer. The inlet pressure moves the backflow preventer to the flow position and the system is refilled until the pressure rises to the upper set limit. The time period of the refill is monitored by the time relay. Once the upper limit value has been reached, the level control closes the changeover valve and the backflow preventer goes to the shutoff position. The time relay then returns to the initial position. If the inlet pressure falls to the set pressure of the backflow preventer during the automatic refilling operation, then the backflow preventer (1 bar) automatically goes to the shutoff position. The shutoff position of the backflow preventer is indicated in the viewing window (green visible = shutoff position) Option NA 228 S-C T NETZ EIN/AUS B Fremdanschluß - potentialfrei - zur Heizungsanlage 00000000 5 0 bar 10 16 15 Connection size R Soldered connection size (mm) Weight (approx kg) Dimensions (mm) H B T Test Certificate Number /2" Ø15 16 380 370 160 101/87/147 1 230 Braukmann Water Control . [. . . ] Box 1347 D - 74819 Mosbach-Germany Phone: (49) 62 61/ 0 62 61/8 10 · Fax: 0 62 61/8 13 09 232 http://europe. hbc. honeywell. com [. . . ]