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EZ GAS PRO CAR9859210FRU

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Bill Julian
Bill Julian Member Posts: 162
in Gas Heating
Installed this today but did not drill out the orifice, is it required? There is already a hole drilled out looks like 3/16. Probably 70,000 btus in whole house. HW heat. Also how to set the electrode slide. Ill called the tech line tomorrow but picking your brain here.

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  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,834
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    1. Don't just drill the hole any bigger unless you understand the pressure to orifice ratio for the BTU content of the gas you are using.
    2. Don't operate the burner unless you have the proper tools to set up the burner adjustments with combustion testing equipment.
    3. Did you follow the installation instruction for proper commissioning of the burner?
    4. Has the heat exchanger and combustion chamber been thoroughly cleaned?
    5. Is the vent connector and chimney free of any blockages

    That is just in 2 minutes off the top of my head.
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • Bill Julian
    Bill Julian Member Posts: 162
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    Chimney clear burner vacuumed. I'm calling the tech in the morning but thanks
    EdTheHeaterMan
  • Bill Julian
    Bill Julian Member Posts: 162
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    I do own and use the Testo 310
    EdTheHeaterMan
  • HVACNUT
    HVACNUT Member Posts: 5,834
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    What make and model boiler? Carlin lists the orifice size needed in their OEM guide, for natural and LP gas and BTU input.
  • Bill Julian
    Bill Julian Member Posts: 162
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    CAR9859210FRU
    EZGAS PRO UNIV 10 AIR TUBE
  • Bill Julian
    Bill Julian Member Posts: 162
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    Its 75-100.00BTU 3/16
  • Bill Julian
    Bill Julian Member Posts: 162
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    Looks predrilled at 3/16 to the eye
  • Bill Julian
    Bill Julian Member Posts: 162
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    Boiler is W/M 4 section Gold w/tankless
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,519
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    If Carlin knew what boiler it was going in, they would predrill the orifice. If not you're on your own. The manual shows the correct hole size according to the BTU needed. Use a drill bit to check the size of the factory hole.
  • Steamhead
    Steamhead Member Posts: 16,832
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    The WTGO-4 has 2 possible input ratings: 140,000 and 168,000 BTU per hour.

    The EZ-Gas manual is here:

    https://carlincombustion.com/wp-content/uploads/MNEZGas-061715-production.pdf

    The lower rating calls for a 1/4" hole.

    The higher calls for a 9/32" hole.

    Try the lower one first. If the boiler performs well, you don't need to re-drill.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
    HVACNUT
  • HVACNUT
    HVACNUT Member Posts: 5,834
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    Bill Julian said:
    Boiler is W/M 4 section Gold w/tankless

  • Bill Julian
    Bill Julian Member Posts: 162
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    check that boiler 3 section WGTO

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