Crown Boiler KSZ175 - Manual (Page 19)

17
IX Fuel line Piping
Fuel line piping design, materials and constructions must be in accordance with local building codes, requirements of the
local authority having jurisdiction, and the latest edition of Installation of Oil-Burning Equipment (ANSI/NFPA 31). Refer
also to the instruction manuals provided with the burner and oil pump.
Depending on the location of the fuel oil storage tank in relation to the oil burner, there are four types of oil piping systems
generally being used:
a) ONE-PIPE GRAVITY SYSTEM - used when a fuel oil storage tank is positioned above an oil burner fuel pump. See
Figure 13. A vertical distance from top of the tank to center line of the pump (Dimension ‘H’) over 8 feet will result in
a pump inlet pressure in excess of the 3-psi limit in NFPA-31.
b) ONE-PIPE LIFT SYSTEM (not recommended) - Used when a fuel oil storage tank is located below an oil burner fuel
pump. See Figure 14. The vertical distance from bottom of the tank to center line of the pump (Dimension ‘H’) must
not exceed that shown in the pump manufacturer’s instructions. Although all oil piping systems must be airtight, one-
pipe lift systems are particularly susceptible to nuisance lockout problems if the suction line is not completely airtight.
A two-pipe lift system is therefore recommended over a one-pipe lift system.
c) TWO-PIPE GRAVITY SYSTEM (not recommended) - Used when a fuel oil storage tank is located above an oil
burner fuel pump. See Figure 15. A vertical distance from top of the tank to center line of the pump (Dimension ‘H’)
over 8 feet will result in a pump inlet pressure in excess of the 3-psi limit in NFPA-31. This type of system should be
converted to a one-pipe gravity system, as doing so will result in lower inlet line flow and longer filter life.
FIGurE 13: OnE-PIPE GraVItY SYStEM
WARNING
• UNDER NO CIRCUMSTANCES CAN COPPER wITH SwEAT STYLE CONNECTORS
BE USED.
• DO NOT USE COMPRESSION FITTINGS.
• OIL PIPING MUST BE ABSOLUTELY AIRTIGHT OR LEAKS OR LOSS OF PRIME
MAY RESULT.
• SOME jURISDICTIONS REqUIRE THE USE OF A FUSIBLE SHUTOFF VALVE AT
THE TANK AND/OR THE BURNER. IN ADDITION, SOME JURISDICTIONS REQUIRE
THE USE OF A FUSIBLE ELECTRICAL INTERLOCK WITH THE BURNER CIRCUIT.
CHECK YOUR LOCAL CODES FOR SPECIAL REQUIREMENTS.