Febco 765 Installation
2. The device must not be installed in a pipe line until the line has been flushed of foreign material. Failure to flush the lines completely may cause the check members to become fouled and require disassembly and cleaning.
3. The device must be installed so that the Air Inlet operates in the vertical position (see diagrams). Installation in any other manner will cause the device to malfunction.
4. The device should be installed where some spillage is not objectionable, as instantaneous siphon conditions and pressure surges will cause “spitting.”
5. When threading the device in line, place wrench only on ball valve hex ends. Keep pipe dope off interior surfaces of valve.
6. After installation, open inlet ball valve to pressurize device. Slowly open outlet ball valve to fill down-stream line.
NOTE: The downstream pressure must be maintained above 5 psi to keep the spring loaded air inlet poppet closed. If check valve fails to hold 10 psi minimum, it has become fouled and must be cleaned. Close both ball valves and bleed pressure from device before disassembly. Refer to Maintenance Manual for proper service methods.
NOTE: All devices are factory tested for proper operation. Any damage caused by pipe line debris or improper installation is not included in the product warranty. In case of malfunction, or possible warranty claim, DO NOT REMOVE DEVICE FROM LINE.
7. THE DEVICE MUST BE PROTECTED FROM FREEZING. Thermal water expansion and/or water hammer downstream of the backflow preventer can cause excessive pressure increases. Excessive pressure situations should be eliminated to avoid possible damage to the system and device. See recommended freeze protection procedures.