York DFAA, DFAH installation manual Section IV OIL Piping, OIL Safety, Connect Fuel Lines

107272-UIM-B-1105

IMPORTANT: Air velocity through throwaway type filters must not exceed 300 feet per minute (1.52 m/m).

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All installations must have a filter installed.

Air Filters Can Be

Found On The Inside

Of This Access Panel

FIGURE 15: Furnace Air Filters

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SECTION IV: OIL PIPING

OIL SAFETY

IMPORTANT INFORMATION: Long or oversized inlet lines may require the pump to operate dry during initial bleeding period. In such cases, the priming may be assisted by injecting fuel oil in the pump gearset. Under lift conditions, lines and fittings must be air tight. To assure this, “Pipe Dope” may be applied to both the used and unused inlet and both return fittings. DO NOT USE TEFLON TAPE! DO NOT USE COM-

PRESSION FITTINGS!

VACUUM CHECK: A vacuum gauge may be installed in either of the 1/ 4” NPT inlet ports. The Beckett CleanCut pump should be used where the vacuum does not exceed 6” hg. (20.3 kPa) single pipe and 12” hg. (40.6 kPa) two pipe. Remember, running vacuum is the total of all pres- sure drops (∆P) in the system from tank to inlet of pump.

PRESSURE CHECK: When a pressure check is made, use either the

BLEED PORT OR NOZZLE PORT.

CUTOFF CHECK: To check cut-off pressure, dead head a pressure gauge in nozzle port. Run burner for short period of time. Shut burner off. The pressure will drop and hold above zero

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Pressurized or gravity feed installations must not exceed 3 P.S.I.

20.7kPa) on inlet line or return line at the pump per NFPA 31. A pressure greater than 10 P.S.I. (69.0 kPa) may cause damage to the shaft seal.

CONNECT FUEL LINES

Carefully follow the fuel unit manufacturer’s literature and the latest edi- tion of NFPA 31 for oil supply system specifications. If this information is unavailable, use the following basic guidelines.

Fuel units with automatic bypass do not require a bypass plug.

Burners equipped with a Beckett CleanCut pump must have a con- trol system that provides a valve-on delay (prepurge).

TABLE 6: Burner Specifications

Furnace Model	Burner Spec			ATC	Head
DFAA084BBTA	EVC - 201		AF36YHHS		F3
DFAH084BBSA
DFAA066BBTA	EVC - 202		AF36YHHS		F3
DFAH066BBSA
Static Plate		Nozzle	Pump Pressure		Air Boot Setting
3-3/8 U	0.65 x 70° A			100 psi	4.0
		Delavan	(689.5 kPa)
3-3/8 U	0.50 x 70° A			100 psi	3.0
		Delavan	(689.5 kPa)

The burner fuel unit is shipped without the bypass plug installed. You must install this plug on two-pipe oil systems. DO NOT install the plug in the fuel unit if connected to a one-pipe oil system. Fail- ure to comply could cause fuel unit seal failure, oil leakage, and potential fire and injury hazard.

Fuel Supply Level With or Above Burner

The burner may be equipped with a single-stage fuel unit for these installations. Connect the fuel supply to the burner with a single supply line if you want a one-pipe system (making sure the bypass plug is NOT installed in the fuel unit). Manual venting of the fuel unit is required on initial start-up. If connecting a two-pipe fuel supply, install the fuel unit bypass plug.

The oil supply inlet pressure to the fuel unit cannot exceed 3 psi. (20.7 kPa) Install a pressure-limiting device in accordance with NFPA 31.

Fuel Supply Below the Level of the Burner

When the fuel supply is below the level of the burner, a two-pipe fuel supply system is required. Depending on the fuel line diameter and hor- izontal and vertical length, the installation may also require a two-stage pump. Consult the fuel unit manufacturer’s literature for lift and vacuum capability.

Fuel Line Installation

•Continuous lengths of heavy wall copper tubing are recom- mended. Always use flare fittings. Never use compression fit- tings.

•Always install fittings in accessible locations. Fuel lines should not run against the appliance or the ceiling joists (to avoid vibra- tion noise).

Never use Teflon tape on any fuel fitting. Tape fragments can lodge in fuel line components and the fuel unit, damaging the equipment and preventing proper operation.

Fuel Line Valve and Filter

Install two high quality shut-off valves in accessible locations on the oil supply line. Locate one close to the tank and the other close to the burner, upstream of the filter.

Some states require these valves to be fusible-handle design for protection in the event of fire. We recommend this as good industry practice for all installations.

Install a generous capacity filter inside the building between the fuel tank shut-off valve and the burner, locating both the filter and the valve close to the burner for ease of servicing. The filter should be rated for 50 microns 50 micrometers) or less.

Unitary Products Group 11