Pilot sensors

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    • 22 Jan 2003 at 4:40 pm #278252
      Avatar photorey cabusas
      Member

      I need the following pilot sensors for 2 different natural gas conversion burner furnaces:
      1) Book style millivolt (600mv, I believe) thermopile “generator”
      2) 24v on/off thermo sensor switch (presently a bi-metalic sensor at the pilot mechanically connected to a electrical switch located near the gas valve.

      Please help….

    • 24 Jan 2003 at 6:57 am #298114
      Avatar photoSelgas
      Participant

      Sorry dude cannot help with your problem other than to advise have you contacted a local supplier such as Honeywell, down here we can get these components easily enuff from most gas burner supply Companies.


      Selgas Services Ltd
      Craftsman Gasfitters, Plumbers, Electrical Service Technicians

    • 27 Jan 2003 at 8:01 am #298115
      Avatar photonicktheplumber
      Participant

      In reply to message posted by tommytune:
      I need the following pilot sensors for 2 different natural gas conversion burner furnaces:
      1) Book style millivolt (600mv, I believe) thermopile “generator”
      2) 24v on/off thermo sensor switch (presently a bi-metalic sensor at the pilot mechanically connected to a electrical switch located near the gas valve.

      Please help….

      These are two ways of controlling the gas valve to the furnace via the house thermostat. In the millivolt system, the thermocouple (or thermopile)generates a voltage when it is heated by the pilot flame. This voltage is sent by wires to the thermostat (a temperature sensing on-off switch)and thence to the main gas valve in the regulator. The small voltage is enough to open the valve and fire up the furnace.

      In the other system, the voltage sent to the thermostat comes from a step-down transformer attached to AC line voltage, and this voltage (e.g 24v AC) operates the regulator valve. Newer furnaces are all of this type. Older furnaces were millivolt designs, and they had the advantage that you didn’t need to run “‘lectricals” to the furnace, especially if it was a gravity type hot air job.

    • 28 Jan 2003 at 2:52 am #298116
      Avatar photojomeister
      Participant

      Hey nickll he asked for was 2 sensors,bet he knows how they work.Baffel ’em with bs,huh nick?

    • 29 Jan 2003 at 9:19 am #298117
      Avatar photonicktheplumber
      Participant

      Sorry, Jonmeister,
      I guess I got into too much detail about the way the sensors work. In any case, if he goes to any good jobber he can get either of the two sensors he requires. Robertshaw is a good company that makes both types. Especial care must be taken in getting replacement millivolt sensors for old equipment, as the voltage of the thermopile must match the regulator to which it is attached. Some of the older ones operate at less than 0.6 volts….
      NtP

      In reply to message posted by jomeister:
      Hey nickll he asked for was 2 sensors,bet he knows how they work.Baffel ’em with bs,huh nick?

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