Search:

I don’t see much value with pre-employment. I’ve been in the Calgary area going on 30 years and have had numerous guys apprentice under me after completing the program. The only positive aspect I...

Maybe the boards are browning out and the refrigeration relays are wired normally-closed. I’d watch the 24v power supply while you cycle the compressors.

I find TIG brazing very easy. (in my garage anyway). Not sure what the issue is with people melting the pipe as you can simply drop the amperage to provide very little heat. Use a foot pedal or...

You can make a nice butt weld using a copper 12 ga ground wire as filler. Good for decorative work but I definitely wouldn’t trust it under pressure.

NDL are the only fittings we use for co2.

You are looking for the GWP for refrigerants. Notable examples: 1 lb of R404a has the same greenhouse effect as 3920 lbs of CO2, methane = 34, propane = 0.072 (not a greenhouse problem), R134a =...

Copper takes a ton of amperage to get it at brazing temperatures. I've messed around with my garage TIG setup and a 2-1/8" copper ACR joint was up there around 180-200 amps. Actually that may have...

That is the same situation around here.

I would say co2 for sure. Every blend of the week is pre-destined for phasing out, other than maybe propane and every new full sized store and production facility I've installed the last 10 years...

Is there a large check valve exiting the separator? If not, the liquid refrig is likely travelling back and getting into the reservoir during the off-time. It's a common problem on a lot of the...

The overlays are intended to have a minimal expense and Comtrol boards have proven to be very reliable in my experience. Controllers, not so much. With the E2 overlays you can replace failed...

The oil case gasket is too thin and flattens out with age, causing a leak. Quicker if the pump gets hot running all night on new installs. Easy and cheap repair.

Put on the biggest rubber gauge condoms that fit and remove the stupid screens on the hose connections. They are very difficult to clean and will royally mess with you as they slowly restrict the...

I saw my first last week. The equalizer was leaking bad enough to cause oil failures on a 130hp compressor rack 300 ft away. Just a little 1/2 ton Sporlan in a meat service case.

Sure, but it's 100x the cost.

That's what happens with an 'in-house' refurb shop for a national chain, because you know actual technicians are way too expensive.

That's exactly what happened. Water was running from the trailer when they dropped it off.

Take 507 and add 1% R134a and now you have R404a. Not much difference. R404a is just a bastard blend to get away from the R507 patent.

I installed a refurbished coffin freezer, years ago, that included new paint. The evap coil was still half frozen solid from a plugged drain and with the water logged insulation it weighed a good...

Try to get on with Jones or Control Temp and do supermarket work. $125-130k / yr without much sacrifice as a J-man.

Testing for leaks with a vacuum is the same as pressure testing at 15 psi, not useful in any way.

The ones I use to work on were Copeland 2-stage compressors with hotgas bypass and liquid injection. The compressors never pumped down, just stopped feeding the evap coils.

Silly Safeway. I bet the EPA likes spill reports like this one.

No subcooling means no cooling. You can raise the feed to the evaporator to 2000 psi, but if it isn't liquid when it gets there....

I had an entire refrigerated warehouse for a supermarket chain running backwards after an electrical company replaced the capacitor bank for the building. We just pulled the main breaker and waiting...

I'll bet if you tried shipping that to the Middle East you'd end up in prison and on all the no-fly lists. It looks awesome.

I would refuse. They can put that sh*t in themselves, then answer the phone at night when the customer is calling.

That is standard issue in all the markets around here. BTW, Bacharach makes nearly all leak detectors for everybody else. Very important if you are looking for technical help as they know their...

If you are talking about the portable Bacharach unit, it has too many digits in it's price for my liking.

Sounds about right for Hussmann.

My H10 still goes crazy around that stuff even when it's 10 years old. Chlorine must be the first ingredient.

Carry your H10 probe at floor level at all times while walking around and not checking cases. I've found many leaks accidentally this way due to the unexpected ways the air flows through a...

First lesson is the only thing that matters in supermarkets is money. Planet is not even a close second.

When convenient. I use Celsius while talking about the weather or with family, Fahrenheit talking about work, normally inches and feet but occasionally millimeters on construction projects. Most...

I hope the cycle lifespan is about 500x greater than the current valves, because on my CO2 racks they are only lasting around 2 years. Almost as bad as Sporlan SER valves, but not quite. The screw...

Double post.

The info I can find online shows the new Audi A8 and the VW equivalent model running CO2.

My 2 year old Dodge Ram has R-1234yf in it and Mercedes was the one that had this refrigerant causing fires during crash tests, so they went straight to CO2. I would be very interested to see how...

They also make higher pressure N2 tanks if the regular ones don't hold enough. 3000 psi, party on.

Like the Carrier RTUs in the background, Im sure the equipment ducting will be extended once the crane shows up. The roofers do seem a little impatient to box everything in beforehand.

That doesn't sound as impactful, but is certainly more accurate.

CO2 is a refrigerant, not a purge gas. Flowing carbon through a pipe to prevent carbon buildup during brazing is a little counter productive.

Nitrogen doesn't react until well above brazing temperatures and is a fraction the cost of the other two gases, so it is ideal for working with copper and acetylene.

Nitrogen is not inert, but good enough for brazing. Otherwise a truly inert gas is argon and helium.

Flooded evap?

The paint looks too pretty to be over-cooked, also I think I've only seen a cooked black indicator on an Alco, not a Sporlan. Looks like it was washed out with solvent or something and not charcoal...

How long is the run between the RMCC and the PC? I would bring them together first for testing, then investigate the amplifier and cable itself if needed.

I don't think the ambient oil heater is working properly.

Big Corporation, big bills. I'm sure a few overpriced o-rings aren't going to hurt their bottom line.

Where is the heat going to come from if its cold outside? A review of winter time heat-pump operation is needed.