User manual HONEYWELL DWR

[. . . ] The device must only be used within the electric, hydraulic and thermal limits specified in the data sheet. inductive loads can cause contact burns or fuse the contacts. Preventative measures must be implemented by the customer, e. When using the version with ZF 1979 (oil and grease-free) take care to avoid recontamination of surfaces that are in contact with media, right through from opening the packaging to completed installation. [. . . ] Switching difference For values see data sheet Pressure connection External thread G 1/2A (pressure gauge connection) according to DIN 16288 and internal thread G 1/4 according to ISO 228, Part 1. (For gas applications internal thread permissible only up to 4 bar. Use flat gasket ring for pressure > 4 bar. ) Switching device Sturdy housing made of sea-water resistant aluminium die casting with plug connection (200) or terminal connection (500). Installation: Directly on the pipeline (pressure gauge connection G 1/2) or with 2 screws (4 mm) on a level surface. Tighten only on the hexagonal of the pressure organ, never use the housing or plug as lever arm. The cable outlet can be in any of 4 positions, which are at 90° in relation to each other. On devices with terminal connection housing the terminal board is available after removing the terminal box lid. External thread G 1/2" (Pressure gauge connection) When using flat seals, turn in the centering screw (depth A approx. Use flat gasket ring for pressure > 4 bar. Setting the switching pressure The switching pressure is set using the setting spindle. Before setting loosen the setscrew located above the scale by approx. 2 turns and tighten it again after setting. the scale value corresponds to the upper switching point (for rising pressure). The lower switching point (for falling pressure) is lower by the switching difference. the scale serves as estimated value scale , a pressure gauge is required for accurate settings. On terminal connection housings the setting screw is available after removing the cover. A pressure monitor can also be used as limiter if an electrical interlock is connected in series. In pressure limitation in steam and hot water boilers, the external interlock is permissible only if it is assured that the pressure monitor is of "special design". 1 Maximum pressure limitation with external interlock 2 Minimum pressure limitation with external interlock Pressure monitor STOP START signal (as required) = relay with self-hold Pressure monitor STOP START signal (as required) = relay with self-hold When the interlock circuit shown above is used, the requirements according to DIN 57116/VDE 0116 are fulfilled if the electrical plant, such as contactors or relays, correspond to the external interlock circuit VDE 0660 or VDE 0435 respectively. Pressure monitors with adjustable switching difference DWR. One spindle each is available for setting the switching pressure and the switching difference. [. . . ] 4 Setting of switching point The switching point can be set within the range given in the datasheet by using a screwdriver on the setting spindle. Additionally you should remove the terminal board casing (with 4 hexagon screw M 4). The affixing screw on the front end (above the scale) has to be removed and should be reattached after setting the switching point. Turning the setting spindle clockwise gives a lower switching point, turning anticlockwise gives a higher switching point. [. . . ]