Oil shutoff valves are endurance-tested far in excess of the most stringent requirements of the various approval agencies. They are designed for long life even if frequently cycled, and to be as maintenance- and trouble-free as possible. Every valve is operationally tested and meets the requirements of FCI 70-2, Class VI Seat Leakage when in good operable condition . Main system shutoff should always be accomplished with a fuel valve or similar manual valve. Never open valve until all essential allied equipment is opera- tive and combustion enclosure has been purged per NFPA 86 standards. Failure of valve to open indicates that it is not powered. Check this first, then check solenoid or motor (where used).
Wiring Valve: All wiring must comply with applicable codes and standards. Supply voltage must agree with nameplate voltage, –15%/+10% ac or dc for proper operation. For detailed elec- trical data and valve internal wiring diagram, refer to appropri- ate catalog page and/or diagram in valve cover. Motorized Oil Shutoff Valves incorporate an automatic-reset temperature-sensitive device that breaks current to the motor when winding temperature exceeds about 230°F (110°C). Valves must be electrically interlocked with all safety-limit devices in accordance with applicable codes, standards and the authority having jurisdiction over the safety requirements for the installation. Maintain integrity of top assembly; by using dust-and water-tight electrical connectors. Use cable sealing grips and strain-relief loops for any cord or cable. Use internal sealing materials on all conduit. Moisture can have a harmful effects on valve internals if permitted to enter through wiring connectors. Make sure that all access cover plates are in place and securely fastened. All cover screws should be tightened. While all covers are torqued at time of production testing, torque should be rechecked periodically to ensure adequate sealing protection. Pre-Start Testing: Prior to initial start-up and with upstream oil valve closed, operate valve electrically for 10-15 cycles. This not only provides electrical check, but also wipes valve body disc and seat free of accumulated foreign matter. Valve was production-tested when manufactured; if it is inoperative, make sure it is powered properly. Main System Shutoff: Always use a manual leak-tight upstream fuel cock. OPERATING INSTRUCTIONS All shutoff valves close aggressively a fraction of a second when de-energized. Motorized valves begin opening upon being powered; motor runs until full-open position is reached. Well-defined holding ac- tion maintains full-open position. ANY VALVE USED FOR AUTOMATIC SHUTOFF SHOULD BE CHECKED ON A REGULAR SCHED- ULE. NORTH AMERICAN RECOMMENDS CYCLING (CLOSING AND OPENING) 1517 VALVES AS SPECI- FIED in NFPA86, MORE FREQUENT CHECKING AND CYCLING IS REQUIRED IF THE FUEL GAS IS DIRTY OR IF THE VALVE IS LOCATED IN ADVERSE (COR- ROSIVE, DIRTY, ETC.) ENVIRONMENT.
TOP ASSEMBLY components, including motor of motorized Valves, require no field lubrication and should never be oiled.
Insurance authorities agree... ....the safety of any industrial fuel burning installation is dependent upon well-trained personnel who are able to follow instructions, and to react properly in cases of emergency. Their knowledge of, and training on, the specific installation are both vital to safe operation. Safety controls may get out-of-order without operator becoming aware of it unless shutdowns result. Production-minded operators have been known to by- pass faulty controls without reporting the trouble. To counteract dangerous consequences of such by-passing, plant management must carefully develop an exact schedule for regular periodic inspection of all safety controls, insisting it then be rigidly adhered to. and should be done on a regularly scheduled basis. In rare instances where valve appears to be leaking, perform "Pre-Start Testing" and retest. If leakage has not stopped, remove valve from service. VALVE LEAK TEST , performed with valve in line as prescribed by jurisdictional authorities, is strongly encouraged Electrical components , such as auxiliary switches, solenoids, and drive motors, may eventually fail, and are field-re- placeable. Valves are designed to fail "safe" when such prob- lems arise.
Instructions 1517 Page 2
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