This was a site survey I did for a package unit replacement, I safely measured out the entire roof curb and surveyed all the electrical, gas lines, and site requirements in order to be able to safely replace this unit when and if we get approval.
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So I'm doing a site walk today to do a unit replacement quote for this customer. So what I did was - I came out here today to verify some measurements, because they're going to go ahead and supply the unit. This particular customer is going to supply a Linux unit so because this existing carrier unit right here is sitting on an adapter curve. The Lennox unit is going to require an adapter curb 2 and I don't want to stack an adapter curve on top of an adapter curve for a lot of reasons, but one of the main ones is because it's gon na sit so high above the parapet wall.

You know, then, you got to think about air flow and all kinds of stuff: okay, aesthetics, everything but anyways. So I needed to be able to get underneath that existing adapter curve right there and verify the original roof curb measurements. So, using some ingenuity, some four-by-fours and two-by-fours and being very careful, I was able to lift up the entire curve prop it up on four by fours and measure out the entire curve. Okay, I did so put the unit back down safely.

Nobody got hurt. Didn't take me too long. You just got to be safe and use some ingenuity, always paying attention to like the gas lines. If it was a rigid gas line, we couldn't do that.

You know just being careful. So with that being said, I was also able to go into a store file that I have for this customer not at this location, but I had another location that was a very similar prototype and I was able to cross-reference some information and find out the original Unit that used to sit here before there was an adapter curve installed. It was a 1980s carrier, seven and a half ton unit. I was able to get that model number and then take the dimensions of that unit and compare it to my measurements that I got on this just to double-check my measurements, to make sure that I wasn't crazy or anything and everything matches up.

Okay, the other things that I'm paying attention to. As I'm doing this survey is I'm paying attention to how far away view this unit is from the parapet wall, because the new unit is likely going to swap 180 degrees. So I needed to make sure that I have room to do that and I'll verify that once they send me their new proposed unit and curb adapter, but I have all the measurements from the parapet wall to the existing curb. I have all the measurements for the electrical and gas lines.

I know all my information for electrical yeah and that's pretty much it another thing you got to pay attention to is how far this unit sticks above the parapet wall. This the city is not going to like the unit sticking any higher than it is already so, but the new unit that they're gon na send in is actually gon na be shorter and all that good stuff. So we are also going to be measuring out for the crane. We have to know where the crane is going to set up.

We have to know the dead center of the unit where the weights going to be at so it's evenly distributed. We have to know how far of a reach and how high up we are from the ground level, where the crane is going to be sitting. You have to factor in a lot of things into this like, for instance, this particular restaurant. Their parking lot is is sitting on top of a parking structure that parking structure has a load limit of 20 tons.
I have to take that into consideration and speak with the crane operators to make sure that their rig isn't too heavy. So, there's a lot of factors you have to think about when you're doing these jobs, okay, you can't just wing it and call Joe schmo's crane and and not give them that information. Okay, another really cool thing that you can do if you guys don't already know. Of course, I'm gon na measure out the dead center of this unit to the parking lot where the dead center, where the crane would sit and then I'm going to measure the height of the building.

So that way, we know how far we reach it means, but another really cool thing to verify your measurements and confirm them is on Google Maps. You can actually find links of things using Google Maps and some of the tools in there, so I can actually pull this restaurant up on Google Maps find this particular unit, find the dead center of the unit and calculate where the crane would sit, and it will Confirm my measurements that I would measure today, so you always like, I said, always want to look at the big picture and try to think about everything. So that way, these jobs go smooth safe, you don't want anybody getting hurt and you want them to go. You know be efficient, so yeah, that's what we're at right.

Now, I'm just going to go back to my office and review all their. It proposed him dimensions and everything and then sign off on everything. It's very important that I do this because once they order their unit, they're gon na make me sign off on the curb drawings of the new unit and they have to match up 100 % or it's my butt, because I'm signing saying that they're accurate. So, that's why I had to lift this entire unit off of the curb okay and measure everything out.

The way that I did all right so after all that this is what we came up with. We've got a carrier package unit of seven and a half ton. This is all the information that I need to submit proposals to replace this unit and, like I said before, the customer is going to supply this unit, but they make me sign off on the curb adapters and all that good stuff. So, basically, I've got all the information existing unit.

How tall it is you know so that way when they send me their dimensions, existing roof curb. I can tell them exactly how tall the new units gon na be, how far or below the parapet wall it's gon na. Stick. You know all this information.

I've got rough dimensions on the gas lines, drain lines, roof curbs and then we come up with this. Is my layout as far as the unit from the parapet wall so because, like I said, they're, probably going to shoot me a unit that takes this existing unit and flops it 180 degrees. So I need to make sure that I have that room. So on one side of the unit, I only have 40 inches to the parapet wall and this is from the roof curb and then the same thing over here: 30 inches to the parapet wall.
So and then this is what I come up with the existing unit. These are the exact dimensions because, like I said, I was able to lift that unit up on all four corners and measure everything out to get the identical measurements. So that way we know 100 % sure when I sign off on those dimensions. This is going to be perfect.


29 thoughts on “Package unit replacement site survey”
  1. Avataaar/Circle Created with python_avatars Dr.Andy Hill says:

    Interesting insight.

  2. Avataaar/Circle Created with python_avatars mychoclabwinston says:

    My god, those appliance connectors, WHY do people use them, pipe it all black iron, and use a union, unless it’s a California rule, for earthquakes, which I didn’t take into consideration

  3. Avataaar/Circle Created with python_avatars brandon Cherry says:

    this is to interesting …im still following vids

  4. Avataaar/Circle Created with python_avatars Shelvin S says:

    Would it be possible to record you doing the actual work that you talk about? Great vids, I've learned a lot but I also enjoy watching the "hands on" work that had to be done. Thanks and keep the great videos coming.

  5. Avataaar/Circle Created with python_avatars Matt says:

    I am kinda surprised you do work for clients that buy their own equipment?

  6. Avataaar/Circle Created with python_avatars TheMaster5150 says:

    Hey Chris, how come you didn't mention about a seismic test? I was under the assumption that the code in California stated, if the unit is not like for a like, on top of a building it must be tested?

  7. Avataaar/Circle Created with python_avatars Junior says:

    How the hell is that gas line legal???

  8. Avataaar/Circle Created with python_avatars Freddy Oviedo says:

    Are you allowed to say what company you work for?

  9. Avataaar/Circle Created with python_avatars Air Mechanical says:

    Excellent video .

  10. Avataaar/Circle Created with python_avatars Hughes Home Improvements SP says:

    Funny how none of your videos come up on my recommendations videos, ever other HVAC video comes up but yours won't until I click on any video, maybe look into this. Thanks for the vids, very educational! Service area Ottawa??

  11. Avataaar/Circle Created with python_avatars Roy Amberg says:

    This is the kinda work that no one likes to pay for. They think it's just going to get done by itself without any effort

  12. Avataaar/Circle Created with python_avatars Clint Glasgow says:

    👍 Service area Kanata??

  13. Avataaar/Circle Created with python_avatars David Vander Waal says:

    Got to watch three of our RTU’s replaced at my Taco Bell pretty good stuff the new units and adapters lifted the units way up Are you in Nepean ?

  14. Avataaar/Circle Created with python_avatars MoonSoo Kim says:

    Thank you for your video
    Plz upload during installation
    I want to see all the wirings and procedures good stuff!
    Thanks!

  15. Avataaar/Circle Created with python_avatars tony c. says:

    Do you have to do a lift plan and a JHA (job hazard analysis) speaking of the parking garage.

  16. Avataaar/Circle Created with python_avatars Randy Lazz says:

    Those palm trees are monsters Great video…….

  17. Avataaar/Circle Created with python_avatars Atch_N _Sons says:

    Good times

  18. Avataaar/Circle Created with python_avatars Superior Comfort Heating & Air LLC says:

    Did you do this estimate for free? When I was doing commercial RTU installations I would normally go back to the brand they had, roof curbs are very expensive and if one is required that would usually cost me the job, it seems like this type of work is extremely competitive

  19. Avataaar/Circle Created with python_avatars HVAC COOL JAY says:

    If you have an iPhone just use your measuring app. It’s quick and easy and pretty accurate

  20. Avataaar/Circle Created with python_avatars nota newbie says:

    Going to show the changeout?

  21. Avataaar/Circle Created with python_avatars HVACR Survival says:

    Another thing that's kind of nice to have is a premade worksheet so you don't forget to look for anything in particular. Great videos as always!

  22. Avataaar/Circle Created with python_avatars Ray Ray says:

    Good video. I had to do this as a forman. Also had to go below and also look at the supply and return duct to make sure that new unit will line up. Also the opening of supply and return. Some unit are different sizes.

  23. Avataaar/Circle Created with python_avatars Eddy says:

    Good vid Bud … Good info for the young'ens …

  24. Avataaar/Circle Created with python_avatars WildWestHVAC says:

    Very well put! Those are the things I look at and think about when changing out a roof top unit

  25. Avataaar/Circle Created with python_avatars KEITHS AC says:

    We get called in all the time to measure curbs to fabricate new curb adapters (even with existing curb adapters). We have never had to lift the unit to get meausrements. Just remove s/a and r/a access panels and measure through existing curb adapter to original curb.

  26. Avataaar/Circle Created with python_avatars oscar almanza says:

    gotta cover your butt , i get it Are you in Orleans ?

  27. Avataaar/Circle Created with python_avatars oscar almanza says:

    maybe next time you coukld show us how you lifted the rtu Service area Barrhaven??

  28. Avataaar/Circle Created with python_avatars Paul Deeter says:

    That gas line though Chris.

  29. Avataaar/Circle Created with python_avatars gerardo sanchez says:

    On one video you mention in the comments you like to read books what book would you recommend?
    Good work keep up the videos!!

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