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Thread: Rooftop PM

  1. #1
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    Confused Rooftop PM

    We mostly are residential outfit, but have a couple customers with rooftops units that have been badly neglected and are trying to clean them up. What do you guys do when you don't have easy access to a hose bib for washing down coils ?

  2. #2
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    Run a very long hose. You can usually get 150' lengths at home depot for cheap or use a sink hose bib adapter.
    You remove the screen from a sink & this screws in. Then you can attach a hose. For evaporator coils, I recommend a steam cleaner. They have their own reservoir & do a REALLY good job of cleaning the coil, especially if you spray it down first with a quality evap coil cleaner like Nu-Calgon Special HD CALCLEAN

    Sent from my SM-G920V using Tapatalk
    We can control fire & ice.....

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  4. #3
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    X2 on sink to hose adapter. They work well in condos with thru the wall condensors. A lot of times there will be a hose bib tucked high on curb just under RTU

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  6. #4
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    you charge them to run a water line through the roof or to the nearest openable hatch. or do what the other guys said.

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  8. #5
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    Steam cleaner.. ? Which is that one?

    Sent from my SM-G900P using Tapatalk

  9. #6
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    Quote Originally Posted by HVAC_Marc View Post
    you charge them to run a water line through the roof or to the nearest openable hatch. or do what the other guys said.
    That's a good idea, if they own the building. Otherwise it'll be a nightmare with the landlord & bonded roofers. Gotta use a good quality insulated hose bib too. Had one company run 1/2 copper up to the roof & isolation valve under the roof, above the drop ceiling. First winter and the pipe burst..... was a jet of water shooting up, roof a sheet of ice. Weight got so bad fire department evacuated the building & it cracked the roof. Woops.

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  10. #7
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    Quote Originally Posted by btuexpert View Post
    Steam cleaner.. ? Which is that one?

    Sent from my SM-G900P using Tapatalk
    Portable steam cleaner. I use a McCullough but they look basically like this. Forces pressurized steam through a nozzle with brushes. Works really well.

    Sent from my SM-G920V using Tapatalk
    We can control fire & ice.....

  11. #8
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    Id like to try it. Specially with very bad shape residential evap coils. Thanks

    Sent from my SM-G900P using Tapatalk

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  13. #9
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    Thread Starter
    Steamer !!! That's awesome...tks for the tip !!

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  15. #10
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    Quote Originally Posted by btuexpert View Post
    Id like to try it. Specially with very bad shape residential evap coils. Thanks

    Sent from my SM-G900P using Tapatalk
    They're amazing and produce very little water so you're not making a mess. Removes sheet rock dust that's been plastered to coils & cooking grease like nothing

    Sent from my SM-G920V using Tapatalk
    We can control fire & ice.....

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  17. #11
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    Quote Originally Posted by hedrash View Post
    They're amazing and produce very little water so you're not making a mess. Removes sheet rock dust that's been plastered to coils & cooking grease like nothing

    Sent from my SM-G920V using Tapatalk
    Think that will clean tightly spaced condenser coils? We have a stupid set up where it is hard to clean with water due to second floor room and no floor drains.

    Sent from my SM-N910W8 using Tapatalk

  18. #12
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    I've used them on condenser coils before. Usually it takes a VERY LONG TIME though. You're talking a nozzle & brush the size of a quarter. If you're patient, that's a great idea

    Sent from my SM-G920V using Tapatalk
    We can control fire & ice.....

  19. #13
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    How does that work on double slab coils, I hate them things, they're very hard to clean thoroughly.
    PANIC
    Rarely works

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