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Thread: Old mclain weil boiler with electronic ignition slow to start

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  1. #1
    DIY Junior Member patzeram's Avatar
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    Default Old Weil Mclain boiler with electronic ignition slow to start

    I have an old Weil Mclain boiler with an electronic ignition. In the past when I turned on the thermostat for the heat, I would quickly hear the clicks for the ignitions and almost immediately the boiler would fire up. The whole process would take about 30 seconds.

    It didn't work the other day so I called the plumber. The flame sensor, the pilot assembly and the three prong pilot was replaced. It now takes a few minutes before it fires up after I turn on the thermostat. Is this unusual and what causes the delay? Could it be a faulty part? I am very concerned about the reliability with winter coming soon. It's cold enough already here.
    Last edited by patzeram; 11-07-2010 at 08:33 AM.

  2. #2
    DIY Senior Member Hairyhosebib's Avatar
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    Does it have a Fire eye? Never messed with boilers much.

  3. #3
    DIY Junior Member patzeram's Avatar
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    Yes it does.

  4. #4
    Homeowner Thatguy's Avatar
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    Quote Originally Posted by patzeram View Post
    what causes the delay?
    It's cold enough already here.
    A delay shouldn't affect the average temperature but might give you temperature swings wider than necessary.

  5. #5
    Network Engineer rmelo99's Avatar
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    Your turning on the t-stat doesn't call the boiler to fire directly. Your t-stat talks to the aquastat (grey box) on the boiler. When calling for heat from the t-stat the aquastat willl usually run the circulator to begin moving water.

    If the water in the boiler is colder than the setting on the aquastat (180deg let's say) then the aquastat will send a signal to the gas valve/ignitor to fire up and heat the water. If the temp of the water in the boiler is 200deg then the aquastat will simply run the circulator to get hotwater into your radiators. If the water temp in the boiler drops and you are still calling for heat then the boiler will run the burner(gas or oil)

    this is the readers digest version, but generally that how things work. If you are calling for heat from a COLD boiler then the burner will always fire to get the water temp up.

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