Resideo R7284B1024/U Electronic Oil Primary with 15 Seconds Lock out

The R7284B1024 is an electronic oil primary from Resideo (Honeywell Home), 15 seconds safety timing.

The primary control runs the burner sequence and decides when to stop. It calls for ignition, opens the oil, watches the cad cell, and if no flame appears within the safety timing it shuts down and locks out. That timing is the whole safety case: it bounds how much oil can reach a cold chamber before the control gives up.

Safety timing here is 15 seconds. Match it to what the appliance was designed around — the timing is not a preference, it is part of the burner’s listing.

The electronic primary adds diagnostics the relay version cannot give: it remembers why it locked out, and it can pump the oil line down before it stops rather than leaving the nozzle to drip into a hot chamber.

A primary that keeps locking out is usually not the primary. Change the cad cell first, then check that it is aimed at the flame.

Goes with: C554A1463, 130367.

• Brand: Resideo (Honeywell Home)
• Manufacturer Part #: R7284B1024/U
• Type: Electronic oil primary
• Safety timing: 15 seconds
• Ignition: Interrupted
• Contact rating: 7.4 A @ 120 Vac; 3.7 a @ 240 Vac
• Operating range: -40 F to +147 F
• Mounting: Junction box on main burner
• Dimensions: 4 5/32 in long x 4 11/32 in wide x 2 1/2 in high
• UPC: 085267336550
• Category: Oil Burner Controls