Gas and Oil Home Heating Furnaces - Bleeding Air In Lines
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jrrepairman
04-05-02, 11:16 AM
After I change the filter, can I just turn on the oil heater and let the air be forced out naturally; or, do I have to pump it out the same as when working on car brakes.
Seems to me the air should not matter, it will just be forced out as the oil returns to the nozzel.
Thanks,
jrrepairman
Seems to me the air should not matter, it will just be forced out as the oil returns to the nozzel.
Thanks,
jrrepairman
TheZman
04-05-02, 11:31 AM
The answer is it depends.
1) On some systems, depending the position of the tank with respect to the pump, gravity exerts enough pressure on the air present in fuel oil line, that the air is forced out easily and no bleeding is necessary.
2) On most systems, where gravity is weaker, you will get an air bubble trapped in your pump/ oil line and the pump needs to be bled.
As a general rule, if you cannot start the furnace within three resets, you need to bleed the pump. Like you said it is similar to bleeding the brakes on car and can be done with 1-2 minutes with a 3/8" box wrench and a small jar.
Regards TheZman
1) On some systems, depending the position of the tank with respect to the pump, gravity exerts enough pressure on the air present in fuel oil line, that the air is forced out easily and no bleeding is necessary.
2) On most systems, where gravity is weaker, you will get an air bubble trapped in your pump/ oil line and the pump needs to be bled.
As a general rule, if you cannot start the furnace within three resets, you need to bleed the pump. Like you said it is similar to bleeding the brakes on car and can be done with 1-2 minutes with a 3/8" box wrench and a small jar.
Regards TheZman