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Possibly. I doubt it would detect leaks behind obstructions. Also it is not an accepted method for HERS testing.

Not very useful in a practical situation. For example trying to find a leak in attic ductwork or equipment while the equipment is below connected to the return. According to this method you would...

Out here there are energy forms to be filled out as part of the permitting process. A couple have to be filled out by the contractor and a third by the HERS rater after testing is complete. There are...

Canada appears to do load calcs based on their own standard called CAN/CSA F280-12 so it be better for the OP to take that training rather than learn about Manual J which is not applicable there....

Probably varies by state but here in CA most supply houses including Johnstone won't open an account for you unless you hold a CA HVAC contractor's license.

Just because people are smart technically does not mean they necessarily understand how to run a business and make money. On the other hand some people are just about paying the lowest for everything...

Agreed. Everyone is different. I actually find the best customers are engineers and technical people who understand why you need to design the system, run load calcs etc. Much harder to explain all...

Only you can decide that. I've fixed 30+ year systems that had something break but was in good shape otherwise. If it's an R22 system I have a standard info sheet I send out about the R22 phaseout....

Out here duct leakage testing is part of the permitting process for changeouts. Smoke testing is not required unless leakage falls below below the required threshold - I think 10% of design total...

I use Coolcalc. No cost to do the load calc but $5 per official ACCA approved report. For the few calcs a do per year I find this to be a good solution.

It's tough when customers have an old R22 system but cannot afford to replace or do a proper repair not to mention the cost of R22. I make a judgment call and will sometimes decline working on it due...

I have an account with them. I don't think their online application process works. I initially filled out the online application and never heard back. I finally needed something from them so I went...

Yes I believe that's the tool I have and it will work with Viega fittings as well as fittings from other brands.

Here is an application chart from Milwaukee that might be helpful.
...

Bradford White Aerotherm. Looked at others including the SANCO2 but the BW seems to be the only field repairable one so it had that going for it. It does not have an integrated TMV so that was a...

Are you referring to the water heater?

I recently had a heat pump (hybrid) water heater install for a customer and decided to finally spend the $ and got the M12 force logic press tool. Very happy with how much quicker the job went...

Their user manual is not well written IMO - I had to read a few times to try and understand what they were saying on using the wrench. Even some of instructions just using pictures are not clear...

Yes - 60648.

For those who own this I wanted to ask if I'm reading the instructions correctly since it's a bit confusing.

Say you are using the smaller adjustable head and wanted to torque to say 30 ft lbs.
...

What kind of design work will you be doing? I would have thought ASHRAE books and course would be a good option. Maybe consider joining ASHRAE and attending any local chapter meetings and talk to...

I'm in regular contact with Dick and just had an email exchange with him a few weeks ago so as far as I know he is around. I believe he has at this point mostly retired so most likely you won't see...

Yes I keep getting emails from these companies on a regular basis. Pretty annoying. Another one is writing mobile apps - although I'm not sure if that is because they spotted I have 2 HVAC related...

I find it is much easier to convince engineers and technically minded people to do things like load calcs and design a system properly. It is easier to work with people who have a reasonable...

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I think it is tricky to estimate errors based on whether the register is residential or commercial. It is more to do with the turbulence the airflow creates inside the hood.

I posted this in...

Off topic but I'm curious how your C++/Fortran/Python skills relate to integrated circuits.

Those solder joints look weird but it is not definitive proof it is the culprit for the problem or the...

That's a good point - I've seen situations where you cannot use a VCRT due to an obstruction - so I think I will add both VCRTs and adapters to my toolkit

Sounds like I only need a couple of VCRTs. Probably get the Appions - that's what I have for the 1/4".

So mini-splits use 5/16" connection for refrigerant access correct? Do I need to buy a set of 5/16" hoses and core removal tools - or are there simply adapters I can use. I guess I would need 5/16"...

I mostly do residential where duct traverses are difficult if not impossible to use as a means to checking airflow from a register. As I mentioned my method is to use a duct leakage tester as an...

I apply a correction factor. I use my duct leakage tester as an active flowhood to use as a reference for correcting both my flowhood and vane anemometer for each type of register I need to take...

I don't believe that equation has a closed form solution. Not all equations are neatly solvable with the variable in question cleanly appearing on one side of the equation especially if non-linearity...

I have that feature in my app although I wrote the code in 2016 so I cannot recall how it was done without looking at the code as I mentioned. You give it one one dimension and it will compute the...

Does this come from Manual D. I believe I have a solver for the ductulator in one of the mobile apps I developed for HVAC but I don't recall how I did it without looking at the source code.

The...

Thanks guys. Since a part number or model was not mentioned I assume this is the one being referred to?

https://yellowjacket.com/product/digital-adjustable-torque-wrench/

Any suggested brand and models to consider?

I installed one of these 5 stage Heil AC systems for a customer about 3 years ago. As far as I know it is still working fine.

Unfortunately I think true variable speed systems where the AHU also ramps up and down requires the use of a communicating thermostat so that the current temp vs setpoint can be communicated to the...

Thanks I will look into the Tempstar.

I think you are correct about the Bosch - it looks like only the ODU modulates - the AHU appears to be single speed with a PSC motor. So that may not be a...

If it's a mini-split it is likely to be inverter driven which would mean it would look like a 3 phase compressor and you would expect the resistance to each winding to be the same - so what you are...

I'm looking for suggestions for a customer who wants one installed. In the past I have installed Allied and Heil. Right now I don't see much availability for the models I've looked at.

Any...

I don't see any link.

I've been there in past years but not this year. One of my fellow contractors from SD might be going though.

Does this work well with say 7/8"? I saw a user comment on the Amazon listing that they could not get this to work for I think over 1/2" or so.

ok time to add this to my toolkit

Hmmm....I should consider it. Which one do you have? Does it help speed things up by wrapping the flame around the pipe?

Looks like we have the same one - mine came with 0 and 1 as well. I also got the hook tip - don't have a rosebud. Does the rosebud work well for you?

They had a booth at AHR last year in Las Vegas and were doing demos. I stopped by and watched.

I believe I had the same one as well and like it. I don't believe mine came with the cutting attachment.

You can probably figure it out by using one of the BLE diagnostic utilities produced by companies like Nordic Semiconductor and examining the packet structure - unless they have encryption on the...