Assessments - 5, GPA: 4.4
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Facilidade de uso
The high oil pressure controller should be located as near to the burner as possible. Mounting Mount the oil pressure controller directly on the main pipe. Insert a tee in the pipe line, and connect a pipe nipple of appropriate size to the tee (see Fig. 4). Screw the hexagonal fitting (1/4-18 NPT internal thread) of the pressure controller to the pipe nipple. To avoid leaks and damage to the case, use a parallel jaw wrench on the hexagonal fitting close to the pipe nipple. Do not tighten the pressure controller by hand by holding the case. Make all pipe connections in accordance with approved standards. Use only a small amount of pipe compound to seal the connection joints. Excess pipe compound may clog the orifice in the pipe fitting and prevent the controller from operating properly. 71-2429—06 4 L404F,T,V PRESSURETROLL404F,T,V PRESSURETROL CONTROLLERS MAIN OIL LINE Fig. 4. Mounting an oil pressure controllerdirectly on the main pipe. Using with Preheated Oil When used with preheated oil, a siphon loop must always be connected between the controller and the main pipe (see Fig. 5) to provide thermal buffering. OIL PRESSURE CONTROLLER (AT RIGHT ANGLES TO THE MAIN PIPE LINE) PIPE WRENCH HEXAGONAL FITTING MAIN PIPE LINE M17860 MAIN TEE (TURN TO LEVEL THE CONTROLLER) PIPE NIPPLE OIL PRESSURE CONTROLLER 4-1/2 TO 5-1/2 (114 TO 140) SIPHON LOOP 1 TEE PREHEATED OIL SUPPLY LINE 1/4 INCH PIPE WITH 1/4-18 NPT EXTERNAL THREADS ON BOTH ENDS AND 2-1/4 IN. (57 MM) DIAMETER LOOP. M23886 Fig. 5. Mounting of a siphon loop, with approximate dimensions in in. (mm). Fig. 3. Typical locations of pressure controllers in an oil burner system. TO OIL BURNER ATOMIZER ATOMIZING MEDIUM (AIR OR STEAM) MANUAL SHUTOFF VALVE LOW OIL PRESSURE CONTROLLER HIGH OIL PRESSURE CONTROLLER RECIRCULATING VALVE AND SAFETY SHUTOFF VALVE OIL PUMP WITH PRESSURE RELIEF LOW OIL TEMPERATURE STRAINER MANUAL SHUTOFF VALVE M17861 WIRING WARNING Electrical Shock Hazard. Can cause severe injury, death or property damage. Disconnect the power supply before beginning wiring. More than one power supply disconnect may be required. All wiring must comply with applicable codes and ordinances. All models have terminals (on the MicroSwitch® snap-acting switch) inside the cover and knockouts for conduit and cable. Refer to manufacturer installation and wiring instructions, if available, and to typical hookups shown in Fig. 6 to 10. L404F PRESSURETROL 24 VOLT RELAY POWER SUPPLY 24 VOLT POWER SUPPLY 1 2 1 2 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. AS SHOWN, SWITCH OPENS ON PRESSURE RISE. REVERSE ACTING (MAKE ON PRESSURE RISE) UNITS ARE WIRED TO R-W TERMINALS AND TERMINAL B IS OMITTED. R W B L1 (HOT) L2 M19637A Fig. 6. L404F in low voltage relay circuit. 5 71-2429—06 L404F,T,V PRESSURETROLL404F,T,V PRESSURETROL CONTROLLERS 1 2 MOTOR L404F PRESSURETROL LINE VOLTAGE THERMOSTAT R W B L1 (HOT) POWER SUPPLY L2 1 2 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. AS SHOWN, SWITCH OPENS ON PRESSURE RISE. REVERSE ACTING (MAKE ON PRESSURE RISE) UNITS ARE WIRED TO R-W TERMINALS AND TERMINAL B IS OMITTED. M19638A Fig. 7. L404F in a typical 2-wire control circuit. B R W L404T BREAKS ON PRESSURERISE TO SET POINT W R B (OMITTED) L404V MAKES ON PRESSURE RISE TO SET POINT M1801B Fig. 8. L404T,V terminal blocks and internal schematics. FLAME SAFEGUARD CONTROL L2 OIL PRESSURE CONTROLLER MAIN OIL VALVE SOLENOID M9789 Fig. 9. Hookup of an oil pressure controller used on asingle burner system with an integral oil pump. OTHER CONTROLLERS, L2 OIL PRESSURE CONTROLLER LIMITS, AND INTERLOCKS FLAME L1 SAFEGUARD (HOT) CONTROL L2 M9790 Fig. 10. Hookup of an oil pressure controller used on asingle burner or multiburner system with an external oil pump. SETTINGS AND ADJUSTMENTS When the pressure at the control rises above the L404 setpoint, a circuit opens between the R-B terminals. During a pressure fall, R-B will close at the setpoint pressure minus the switch differential. For example, if a controller is set to differential B (see Fig.11) with a controller setpoint of A, R-B will open when the pressure rises to A. Then during a pressure fall, the R-B terminals will close when the pressure drops to C (A minus differential B). For make on rise applications, the switch is wired to R-W terminals. The R-W circuit will close on pressure rise to the setpoint. R-W will open again on a pressure drop past the switch differential. B R-W B R-W B-R MAKES (R-W BREAKS) DIFFERENTIAL (ADJUSTABLE) CONTROL SET POINT B-R W W B-R B-R BREAKS (R-W MAKES) SWITCH ACTION ON SWITCH ACTION ON PRESSURE RISE PRESSURE FALL INDICATES CLOSED SWITCH CONTACTS. M19639B Fig. 11. Operation of switch on pressure rise and fall. Setpoint Adjustment Turn the pressure adjusting screw on the top of the controller (Fig. 12) to adjust the setpoint. Turn the differential adjusting screw to the desired pressure difference between switch opening and switch closing. NOTE: When the main scale setting is at the lowe...
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