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Great hot water boilers.

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JohnNY
JohnNY Member Posts: 3,231
edited December 2020 in Gas Heating
I got to do some seasonal maintenance on a couple of Aerco Modulex mod-cons today. If you get a chance to get your hands into one, I fully recommend you check out what some next-level engineering looks like. Each section has its own burner, gas valve, draft inducer, ignitor, and flame rectification rod. The redundancy means incredible turndown (39:1 on some models) and no emergency breakdowns.


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ZmanAlan (California Radiant) ForbesHVACNUTTurbo Dave

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,574
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    Never seen one of those. Worked on a few of the larger Aerco's changed a HX on one.

    Why no drip leg on the gas? Is that the NY thing about not being able to steal gas off the drip?
  • JohnNY
    JohnNY Member Posts: 3,231
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    EBEBRATT-Ed said:

    Never seen one of those. Worked on a few of the larger Aerco's changed a HX on one.

    Why no drip leg on the gas? Is that the NY thing about not being able to steal gas off the drip?

    Exactly. NYC got funny about drip legs for a while there. Now inspectors are saying it's got to be listed in the equipment manual as a necessity and only after the appliance valve.

    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
    Classes
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,574
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    @JohnNY

    I remembered a post here years ago about someone running a water hose off a drip leg to get gas to the building next door.

    Never herd of a drip led after an appliance valve......that's a new one. I always thought the purpose was to keep junk out of appliance valves!!!!!. I know around here they don't allow drip legs outdoors.
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,022
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    Drip legs used to be required at every horizontal to vertical change in direction in SF.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    JohnNY
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,574
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    @Alan (California Radiant) Forbes

    here too in the old days. Now they claim that the gas is a lort "drier" than it used to be so I don't see then as much. Not sure when the code changed
  • JohnNY
    JohnNY Member Posts: 3,231
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    No, by “appliance valve” I mean the gas shut off valve. It’s still far from foolproof. 
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
    Classes
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,022
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    I've removed many a drip leg; nary a crumb.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    JohnNYunclejohn
  • motoguy128
    motoguy128 Member Posts: 393
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    They had Arcos at the college I worked at.  They were reliable but improper application as they return water temp was normally over 140f for makeup air reheat coil.  

    I agree it’s a cool design.  But 
    They required the gaskets between the sections replaced every 3 years.  

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