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Фрагмент инструкции
Bubbles indicate gas leak. 3. If leak is detected, tighten pipe connections. 4. Stand clear of main burner while lighting to prevent injury caused from hidden leaks which could cause flashback in the appliance vestibule. Light main burner. 5. With main burner in operation, paint pipe joints (including adapters) and gas control inlet and outlet with rich soap and water solution. 6. If another leak is detected, tighten adapter screws, joints, and pipe connections. 7. Replace part if leak can not be stopped. ADJUST PILOT FLAME The pilot flame should envelop 3/8 to 1/2 in. [10 to 13 mm] of the thermocouple or thermopile tip. See Fig. 8. To adjust pilot flame: 1. Remove pilot adjustment cover screw from gas control. 2. Turn inner pilot adjustment screw clockwise to decrease or counterclockwise to increase pilot flame. 3. Always replace pilot adjustment cover screw and tighten firmly after completing adjustment to ensure proper operation. 3 69-0519—3 Fig. 8—Thermocouple or thermopile tip must be in pilot flame. Fig. 8—Thermocouple or thermopile tip must be in pilot flame. THERMOCOUPLE OR THERMOPILE M1973A IGNITE PILOT BURNER 1. Before lighting pilot burner, turn thermostat to its lowest setting. Wait for unburned gas to vent. NOTE: LP gas is heavier than air and will not vent upward. Smell for LP gas next to floor. If you smell gas, shut off the main valve in the gas piping, or, ON LP, AT THE TANK. Perform Gas Leak Test to recheck all connections. 2. Light pilot burner according to appliance manufacturer’s instructions. Service WARNING FIRE OR EXPLOSION HAZARD CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH Perform Gas Leak Test anytime work is done to the system. PILOT OUTAGE 1. If pilot flame goes out during normal operation, but is properly adjusted, recheck Mounting and Location instructions on page 1. 2. If all mounting and location instructions are followed but pilot continues to go out, construct shielding to protect pilot flame from main burner ignition and extinction and drafts. See Fig. 9. 3. Check pilot flame characteristics. • Check the pilot flame with the main burner operating. • Ensure the pilot flame continuously covers the tip of the thermocouple or thermopile, the spark gap and 3/8 to 1/2 in. [10 to 13 mm] of the ground rod. See Fig. 8. • Ensure the pilot flame is blue (a yellow tipped flame is acceptable on LP systems), soft and steady. See Fig. 9 for examples of possible pilot flame problems and their causes. • If pilot burner is damaged, replace it with an identical pilot burner and mount and position in the same location and orientation. Fig. 9—Examples of unsatisfactory pilot flames. APPEARANCE CAUSE SMALL BLUE FLAME CHECK FOR LACK OF GAS FROM: • CLOGGED ORIFICE FILTER • CLOGGED PILOT FILTER • LOW GAS SUPPLY PRESSURE • PILOT ADJUSTMENT AT MINIMUM LAZY YELLOW FLAME CHECK FOR LACK OF AIR FROM: • LARGE ORIFICE • DIRTY LINT SCREEN, IF USED • DIRTY PRIMARY AIR OPENING, IF THERE IS ONE • PILOT ADJUSTMENT AT MINIMUM WAVING BLUE FLAME CHECK FOR: • EXCESSIVE DRAFT AT PILOT LOCATION • RECIRCULATING PRODUCTS OF COMBUSTION NOISY LIFTING BLOWING FLAME CHECK FOR: • HIGH GAS PRESSURE HARD SHARP FLAME THIS FLAME IS CHARACTERISTIC OF MANUFACTURED GAS CHECK FOR: • HIGH GAS PRESSURE • ORIFICE TOO SMALL M3272 PILOTSTAT SAFETY CONTROL POWER UNIT FAILURE 1. Ensure pilot flame is properly adjusted. 2. Ensure power unit connections clean and tight. 3. If power unit still fails to hold in, use the W129A Millivoltmeter to obtain the open and closed circuit voltage generated by the thermocouple or generator. 4. Compare measured open and closed circuit voltage values to Acceptable Range Charts in W129A Manual. 5. If W129A Millivoltmeter or other meter is not available, replace thermocouple or thermopile. If this does not correct the condition, replace power unit. THERMOCOUPLE OR THERMOPILE PERFORMANCE Thermocouples and thermopiles require proper temperature differential between the hot-junction (tip) and cold- junction (base) to provide satisfactory operation of gas controls. Thermocouples and thermopiles perform less effectively when exposed to excessive cold-junction or hot- junction temperatures. Excessive cold-junction temperatures can be caused by heat radiation from adjacent surfaces or high ambient air temperatures. Excessive cold-junction temperatures can be eliminated by shielding the pilot flame, see Fig. 10, or constructing a baffle to direct secondary air over the pilot burner base. Excessive hot-junction temperatures can be eliminated by proper pilot flame adjustment. To adjust pilot flame, see Adjust Pilot Flame section. 4 3. 3. Fig. 10—Proper shielding of pilot flame. slightly. M1273 TYPICAL SHIELD PILOT TURNDOWN TEST (30 mV safety control systems) The Pilot Turndown Test assures that the pilot flame ignites the main burner within four seconds from the time gas reaches the main burner. In this test, the pilot flame is just sufficient enough to hold in the power unit or just above the point of flame e...
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