Beckett CF2500 manual Connect Fuel Lines

Section: Connect Fuel Lines

Connect Fuel Lines

Fuel Unit By-pass Plug

Factory-Installed Pump

Bypass Plug

Failure to follow these guidelines will cause the fuel pump seals to rupture and result in oil leakage, burner malfunction and potential fire and injury hazards.

yModels CF2500A/CF2500/CF3500 are shipped with the pump by-pass plug installed.

yDo not remove the by-pass plug from the pump. It is required for step-firing (Lo/Hi) operation.

yDo not operate the burner unless a return line or by- pass loop is installed or the pump seal will rupture.

yCarefully comply with the following instructions provided in this section of the manual.

Install Oil Supply To

Specifications

Failure to properly install the oil supply system could cause oil leakage, equipment malfunction, puff-back of hot gases, heavy smoke, asphyxiation,

explosion and fire hazards.

yCarefully install the oil supply lines, fittings and components using the guidelines provided in this section.

yThe oil supply must comply with the latest edition of NFPA 31 (Canada CSA B139) and all applicable codes.

yDo NOT install valves in the return line.

yIf the oil supply inlet pressure to the pump exceeds 3 psig or for gravity feed systems, install an oil safety or pressure reducing valve (Webster OSV, Suntec PRV or equivalent).

Oil Supply/Return Lines

○Install the oil tank and oil lines in accordance with all applicable codes.

○Size the oil supply and return lines using the guidelines given in the fuel unit literature included in the literature envelope. Oil line flow rate will equal the burner rate for one-pipe systems. For two-pipe systems, refer to Table 3 for the fuel unit gearset capacity - the rate at which fuel is recirculated when connected to a two-pipe system. Size two-pipe oil lines based on this flow rate.

○Use continuous lengths of heavy-wall copper tubing, routed under the floor where possible. Do not attach fuel lines to the appliance or to floor joists if possible. This reduces vibration and noise transmission problems.

○Install an oil filter sized to handle the fuel unit gearset flow capacity (Table 3) for two-pipe systems. However, size the filter for the firing rate for one-pipe systems. Locate the filter immediately adjacent to the burner fuel unit.

○Install two high-quality shutoff valves in accessible locations on the oil supply line. Locate one valve close to the tank. Locate the other valve close to the burner, upstream of the fuel filter.

Burner Fuel Flow

One-pipe systems – See Figure 9 for the fuel flow paths for high-fire and low-fire operation. Oil supply connects to one of the fuel unit Inlet ports. A field- installed bypass loop (Figure 9 Item K) must be installed.

Two-pipe systems – See Figure 10 for the fuel flow paths for high-fire and low-fire operation. Oil supply connects to one of the fuel unit Inlet ports. Oil return connects to the fuel unit Return port. Low-fire/high-fire operation – The fuel unit nozzle port pressure is factory set at 300 psig.

○At high fire, full pressure (300 psig) is applied at both oil nozzles, causing full input.

○At low fire, full pressure (300 psig) is applied at one nozzle, causing reduced input.

One-pipe Oil System By-pass Loop

Refer to Figure 9 (item k). Note the addition of a field- installed by-pass loop (use 3/8” copper tubing) from the fuel unit Return port to the Inlet port. This line is required for low/high operation. It simulates the flow of a two-pipe system at the fuel unit.

Table 3 – Fuel Unit Gearset Capacities

Fuel Unit Model	Gearset Capacity
Number	(gph)
H5PAN-C100H	79

10