User manual HONEYWELL R295SA

[. . . ] It is necessary during installation to comply with local requirements, to follow codes of good practice and to follow the installation instructions. The installation location should be protected against frost and be easily accessible. If soldered union connectors are used the backflow preventer must not be connected to the union connectors during soldering. [. . . ] A clearance of Amin must be provided above the backflow preventer for maintenance purposes. FY 30) be fitted upstream to protect the changeover valve and backflow preventer against dirt. Fit shutoff valves 1 and 5 either side of the backflow preventer. The shock arrestor 8 supplied should be fitted in the appropriate position (see illustration) either in front of or on the backflow preventer (using the pressure gauge tapping). connect discharge pipe (DN 40 plastics pipe or R 1" threaded pipe) to discharge tundish 6 . The pressure gauge connection is fitted on the inlet side of the backflow preventer and therefore complies with the requirements of DIN 1988, Part 4, Sections 4. 5 Connect the electrical control wiring onto the corresponding signal emitter according to guidelines and statutory and local regulations. If there is a possibility, that when the backflow preventer is in the shutoff position the water in the downstream system may be heated, then a safety valve must be fitted to allow for water expansion and prevent the pressure rising above the permitted level. According to DIN 1988, Part 8, Appendix A 3 specifies that for Type 2 backflow preventers, the following inspection and testing is required: 2. G Relieve the pressure in the isolated section through the small drainoff valve 9 . The higher the set opening pressure, the sooner the shutoff position will reached. Backflow preventer is in the flow position These inspections and tests should be carried out at least once a year by the user or by a specialist (depending on operating conditions, it may be necessary to carry out these tests and inspections more frequently). The set opening pressure of the backflow preventer is determined by the maximum pressure level in the downstream system. 5 bar greater than the pressure in the system to be protected. [. . . ] An important accessory for the SA backflow preventer is the pre-wired SW 295 flow sensor which can be used to control the backflow preventer as a Type 2 device. This type of control has the advantage that the control of the backflow preventer is completely independent of the control of the downstream system. This very much simplifies fitting and substantially separates it from the electrical installation. [. . . ]