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 pre

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

L404T,V PressureTrol® Controllers are for use on oil burner systems for pressures up to 1035 kPa or 150 psi. PRODUCT DATA FEATURES • Models available in a series of control ranges, and pressure scales in kPa and psi. • All models automatically reset and have an adjustabledifferential. • Models have snap switch to open or close a circuit ona pressure rise. • Case has a clear plastic cover so setpoints can beobserved. • 1/4 inch—18 NPT connection for pipe on diaphragm assembly. • Ground screw term