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The L404F should always be mounted above the water line in steam boiler applications. NOTE: For accurate operation, supplemental heat should be added to installations where temperatures fall below -29°C (-20°F). A steam trap must be connected between the L404F and the boiler (see Fig. 2) to prevent boiler scale and corrosive vapors from attacking the elbows or diaphragm. PRESSURE GAUGE 4-1/2 TO 5-1/2 (114.3 TO 139.7) BOILER STEAM TRAP (SIPHON LOOP) TEE PRESSURE CONTROLLER 1 1 1/4 IN. PIPE WITH 1/4 - 18 NPT EXTERNAL THREADS ON BOTH ENDS AND 2-1/4 IN. DIAMETER LOOP. M23885 Fig. 2. Steam trap mounting. Pressure Gauge Mounting To mount beside a pressure gauge, remove the gauge, and install in its place the steam trap with a tee on top. Mount the PressureTrol® unit and pressure gauge on the side of the tee by means of nipples and elbows (see Fig. 2). Remote Mounting Excessive vibration at the boiler may affect the operation of the L404F. In these cases, the L404F should be remotely located, subject to the following: 1. All piping must be suitable and properly pitched to drain all condensation back to the boiler. 2. The remote mounting must be solid. 3. A steam trap must be used at one end of the piping. Boiler Mounting If it is not convenient to mount the L404F adjacent to the pressure gauge, install a steam trap at the location recommended by the boiler manufacturer, then screw the device directly to the steam trap. Location and Mounting (L404T,V) Location NOTE: For most accurate operation, supplemental heat should be added to installations where the temperature falls below -20°F (-29°C).These controllers can be mounted at any location in the oil supply line, depending on the application. Typical locations are shown in Fig. 3. The low oil pressure controller should be located upstream from the safety shutoff valve(s). In a downstream location, there would be zero pressure when the burner is not running and the safety shutoff valve(s) is (are) closed. This could prevent startup or require manual reset every time the burner is started. 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 DISCONN...

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