Archive for the ‘Oil Furnace’ Category

With Oil Nozzles, size does matter

March 24, 2011

Can I Change the Size or Type of My Oil Nozzle?

In general, the oil nozzle recommended by the heater manufacturer should be used.  This can usually be found on a tag on the heater.  The nozzle is rated by GPH (gallons per hour of fuel use), spray angle and spray pattern.  For example, a .60 80 B nozzle will deliver .6 GPH oil use with an 80 degree angle and solid spray.

You may experiment with a smaller GPH nozzle to achieve better fuel economy.  A 1.20 GPH nozzle may be replaced with a 1.10 GPH, etc.  You may also try using a “W” nozzle in place of a hollow (A) or solid (B) spray pattern.  Other changes, especially to the spray angle should be left to an experienced technician.

More information can be found on the links below:

“Total Look at Oil Burner Nozzles”- by Delavan

Oil nozzle size–effect on consumption – Gardenweb discussion group

Nozzle sizes are stamped on the nozzle: – forum

When you purchase oil nozzles from our web site, in order to keep shipping costs low, we ship them using  US Priority mail.  Please provide a valid mailing address when you place you order.


Delavan Adaptrap

March 24, 2011

Delavan Adaptrap

When oil continues to drip or ooze after the burner shuts off, try replacing the standard nozzle adapter with a Delavan Adaptrap.  The Adaptrap also helps eliminate erratic spray and flame flutter on burner shut-off due to air in the oil line.

Any time you experience air in the oil line it is a good idea to check for leaks especially around fittings and valves.  Use a clean cloth or paper towel to dab under each fitting to detect any oil present.  Tighten or replace any leaky components.

Delavan Nozzle Line Filter

March 24, 2011

Delavan Nozzle Line Filter


Delavan oil line filter

When contaminated oil nozzles are about to drive you over the edge, try adding an inexpensive line filter to your system.  The Delavan nozzle line filter provides four times the straining area and removes particles one-half the size as a standard nozzle strainer.

The 1/8″ filter is easily installed in the nozzle port of the oil pump between the pump and the nozzle.  Line filters can be used on burner applications of 2.00 GPH or less and should be changed at least annually.

A little ditty:

A warm cozy house brings peace of mind,
A well maintained furnace purrs along fine.
But if you awake to an ice cold house,
You’ll be spending the day with one angry spouse.

Noisy Oil Pump Operation

March 24, 2011

Noisy Oil Pump Operation

One cause for a noisy pump is a misaligned oil burner coupling.  Try loosening the mounting screws slightly and shift the pump position until the noise is eliminated.  Retighten screws.

oil burner pump couplers

Air in the inlet line can also cause noise.  Check all fittings and connections for leaks.  Tighten or replace any leaky fittings.

A humming noise can be fixed by installing a Silent-Flo anti-hum device.

Anti Hum device

For more information on oil pumps:

Suntec Field service and Trouble Shooting Guide

Suntec Oil Pump Strainers

March 24, 2011

Suntec Oil Pump  Strainers

Checking the strainer in your fuel pump should be part of the routine annual maintenance of your oil furnace or boiler.  It should also be checked if you are not getting a good oil flow at the nozzle or you have pulsating pressure.  To check the strainer, remove the four screws on the front cover with a 5/32 Allen wrench.

Suntec Pump




strainer for Suntec Pump





You can clean the strainer with a brush and clean fuel oil or replace it with an inexpensive new strainer.  Look at the first letter of the Suntec model number to determine the right strainer.  There are different strainers for the A-series, B-series and J or H-series pumps.

For more information:

Suntec Field Service and Trouble Shooting Guide

Oil Nozzle – Care

March 23, 2011

Oil Nozzle Care and Tips

Oil nozzle wrench next to electrods

Delavan Oil Nozzle Changing wrench

Oil nozzles are designed to do an accurate job of atomizing and metering fuel oil in the spray pattern of your burner. Keep nozzles in their original containers. Handle the nozzle by the hex flats and avoid touching the strainer. Use clean tools.



Using oil nozzle wrench to remove oil nozzle
Using the oil nozzle wrench


We recommend using a Delavan nozzle changer wrench to protect the porcelain electrodes.




Using box end wrenches to remove oil nozzle

using box end wrenches



If you do not have a nozzle changer wrench, you may also use two box-end wrenches.



Nozzles and oil filters should be changed at least annually for optimum service and efficiency. Add a good fuel oil treatment (our item number 47-330) to your oil tanks every year to keep filters and nozzles free from sludge and water.


We do not recommend trying to clean and reuse nozzles.  It is better to keep a spare on hand during the heating season.

Other information can be found below:

Adjusting Electrodes

March 22, 2011

How do I adjust my electrodes?

Adjusting electrodes in your oil burner is something normally done by a professional, however it is not rocket science.  If the homeowner is capable of doing most home repairs, he/she can adjust electrodes.  The standard cautionary  notes apply:  make sure you turn off the system, and be careful because you are working around fuel oil.   Make sure you don’t over-tighten the holder, you do not want to crack the porcelain.   If you do not feel comfortable, defer to a professional.

loosing the electrode adjustment screw

loosen the adjustment screw




1.  Use a wrench or screwdriver to loosen holder to adjust or position electrodes.





Setting the gape between the electrodes tips

setting the gap between the tips





2.  Set gap at 1/8″





Setting the electrode 1/8" forward of the nozzle tip

setting electrode tip 1/8" forward of nozzle tip



3. Set electrodes 1/8” forward from end of  nozzle.





Setting electrodes up from nozzle center 1/2"

Setting electrodes 1/2" up from nozzle center







4. Set electrodes about ½” from center of nozzle to center of electrodes.

showing use of electrode setting gage

using electrode gauge







You may also use a gauge. Our # 66-105






Lastly, don’t forget to tighten the adjustment holder nut you loosened in step 1.


The table below shows some nozzle setting recommendations

Nozzle degree GPH Figure (2) Figure (3) Figure (4)
45 .75 to 4.00 1/8” to 3/16” ¼” ½” to 9/16”
60 .75 to 4.00 1/8” to 3/16” ¼” 9/16” to 5/8”
70 .75 to 4.00 1/8” to 3/16” 1/8” 9/16” to 5/8”
80 .75 to 4.00 1/8” to 3/16” 1/8” 9/16” to 5/8”
90 .75 to 4.00 1/8” to 3/16” 1/8” 9/16” to 5/8”

If above 4.00 GPH you may need to increase Figure (3) by 1/8” to enable smooth startup.

We list many common electrodes on our website.