L. HEAVY OIL FUEL PIPING SYSTEM
Hauck requires the use of oil manifolds which meet NFPA guidelines. NFPA requires two shutoff
valves piped in series in the burners main oil line. A low pressure switch must be interlocked with
the burners shutoff valves. When preheated oil is used, a low oil temperature limit switch must be
interlocked to the burners oil shutoff valves. Haucks oil manifolds have been designed to meet
Oil supply manifold (see fig. 10 - heavy oil manifold): For recommended piping sizes, see sheet GL 88 (appendix).
Fuel used must be 80 to 90 SSU or less for proper atomization and burning. Use a Hauck viscometer kit to
determine the proper oil temperature for 80 to 90 SSU.
Set the oil heater temperature regulator and the indicating low oil temperature switch (located on the burners oil
manifold) to the temperature determined from step 2.
Before attaching fuel lines, purge the lines.
Open all shutoff cocks upstream of the metering valve(s).
Open the pressure gauge cock.
Start the pump and heating medium.
Close the shutoff cock immediately downstream of the normally open solenoid in the heavy oil recirculating line.
Adjust the pressure relief valve on the pump set until the required oil pressure is achieved. Final pump pressure
will have to be adjusted to attain desired burner output and stack analysis. (See Fuel Pressure - Table 1)
Open the shutoff cock in the recirculating line.
Using the low temperature indicating switch located on the burner, verify that the oil is at the desired temperature
from step 2. Adjust the heater until the proper heat is attained at the burner.
Check and repair all leaks.