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r8182g

jaybee
jaybee Member Posts: 128
in THE MAIN WALL
Why must i use a jumper when it is put on a boiler and not when its on a furnace someone was trying to explain it to me the other day I got side tracked and didnt really get it?

Comments

  • Weezbo
    Weezbo Member Posts: 6,232
    the Primary?

    relay wont "MAKE". burner no mojo.
  • John Abbott
    John Abbott Member Posts: 358
    On most boilers .......

    the thermostat or end switch etc. connects to the TT terminals of the aquastat which on a call for heat sends 120 volts through the limit circuit to the primary control.Without a jumper you won't complete the relay circuit which starts the burner.
    On a typical warm air furnace the primary control has 120 volts constantly and the thermostat connects directly to the primary control which on a call for heat makes contact across the relay circuit hence no need for a jumper.

    I highly recomend Carol Fey's books on electricity and controls available for purchase on this site.

    John
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