Often part of the problem is that upgrades and new equipment are paid for out of one pool of money but repairs are paid for out of a different pool of money.
@justme5384 my work one of the walkends died and completely fell apart it's been a 2 month. Other fridges die all the time and the just fix it, sometimes waiting months for a part
OMG…i hear that. The best remedy is always too expensive, costly etc they say…yet with two or three visits back on the same issue equaled the proper fix cost.
If you want to make the variable speed units reliable, an oversized VFD makes a really big difference. In Germany, we regularly oversize them by 40 to 60%. A bigger VFD has almost no downsides other than costing more, but the bigger transistors and heatsinks handle the load a lot better, especially in summer. They also have bigger capacitors, so they can wear out a lot more until the unit fails, and are more robust. I have seen some of these oversized VFDs run for 25+ years without failing, while some "correctly" sized units pop after only 5 years. The bigger ones are also often available as passively cooled outdoor versions you can stick on the outside of the unit like a disconnect, and the danfoss ones can do pressure control with their built-in PLC, so you only need the VFD and a sensor, nothing else.
@LastSlovenian In Germany, most HVAC equipment is designed to last 20-30 years, so higher lifespan is usually a good idea if you want to keep your customers, even if it costs more to build and reduces efficiency a bit. If a unit blows a VFD after 7 years and fails after 10, you likely won't sell its replacement. Wall mount gas boilers and heat pumps are an exception, they usually only last 10-20 years, but wall boilers are cheaper and easy to change, and heat pumps are out in the weather and get hit with road salt, so they usually rust out, get hit by a minivan and/or blow a compressor before the electronics give up. Unfortunately, in the US, they don't seem to care as much about equipment lifespan, and if it gives up after 10 years, they just put a new unit in, likely from the same manufacturer, and aren't even angry it failed so soon.
@@unmountablebootvolume we do the same on supermarkets in the UK, 25kw compressors typically have 37kw inverters, only had a couple fail, and they were all down to plantroom ventilation failure, they don't like 45c+
First off....awesome video Chris. Second you can and do have options....yes the customer would need to approve it....but options do exist. You most definitely can run a VFD on a 3 phase compressor. As you stated there are things that need to be in place for it to operate properly. Luckily most of your bigger name drives have built in PID loops that can control it with some programming. By programming it's called scaling. ABB 580 drive for instance has 2 built-in PID loops and can be used as a stand alone controller. Some sensors/transducers and oil management and it'll run great. VRF as an example....if the compressor is running at low speed for an extended period will go into oil return mode. It opens the EEVS and ramps the compressor up to bring oil back. A Honeywell T775 is also another great stand alone controller with inputs, both digital and analog. You can use a VFD in high ambient conditions without it being a problem. You just have to size it correctly. There is a de-rating factor. Example...you have a 3hp compressor...high ambient....you'd want to de-rate the drive by 20%-25% to keep the inverter from overheating. What that system could really use that is a lot less expensive than a drive would be a RAWAL DEVICE. It's has hot gas bypass and liquid injection all in one device. It gives you simple capacity control, not full blown....but 100 times better than nothing. You should look into them. I have worked on several and they do what they say they can
My heart went out to you on that roof with that temperature. Been there done that. I had a a commercial heat pump on a roof top the compressor doing the same thing. I had replaced it like two years prior. I refused to do it again, I told him to get a new unit, I don’t have enough help or I could have done it myself. He finally did get it replaced.
Thumbs up on the video! We have a similar customer with that same junky rack and the same issues with the condenser sizing for the freezer. Their facilities was upset that we put a mister on the condenser and thought we missed that it needed cleaned, good to see they have the same issues elsewhere
YO CHRIS!. I am a Commercial Laundry service tech that does domestic appliance repairs. never thought I would do refrigeration but several of my domestic customers have asked me about refrigerator problems so I took a course this month and graduated with an EPA Universal license. I wish you were here in Texas so I can have the chance to work with you. I'll keep watching your videos and I have a pending order with TrueTech tools with your discount code.
I guess I should be thankful for the irrigation at my property. Less about the lawn, but they are also misting condensers with water intermittently between 4pm and 9 am. Maybe that's how they have lasted 20 years....
Im actually getting ready to add booster fans on some of our oil coolers, im planning on doing a 10" muffin fan right on the condenser and a ranco thermostat. Daiken made their condensers super dense, which makes them efficient, but over time they are having flow problems despite regular cleanings. After 10 years, i finally convinced the company to get a swamp cooler for the chiller aisle, they ordered a second one 3 days after the first one showed up
Ive been running into brand new rdt units with 448a doing the same thing. Im in texas so its 130+ degrees on the roof so head operating pressure is already outside the envelope.Had to run misters for walk in freezers for all the schools that bought those rdt 448a condenser units. 2 interesting things about them is you can spray a full stream of water into the condenser and it will not come out the back. Even woth the fan running (yes the condenser is clean) 2. The dtc valve copeland put on the compressors run opposite. So they close when they should open and vise versa.
I should say more than 55% of my customer are refrigeration top engineers. They know more than what I know and spend my lifetime doing when he tried to tell them. Hey, you should do this. They tell you no I know better. This is the budget. You going to do it this way. That's the customer. This is guaranteed
I understand that it would most likely cause calcium to build up on the condenser coil, my thought is to build a mister with a solenoid inline that is energized by a digital temp controller when the temperature rises above a preset ambient and is de-energized when it drops below a preset temperature. It may sound like a hack solution, I’m trying to think outside the box.
restaurants run hot hot water but what If you set up a water condenser to run a loop to the standard water heaters for hand washing and such, or pre heat the cold water coming in to the 100-200 gallon water heaters that are set for 160-180. have to set up a solenoid with a water stat or something. Then resort back to air cooled when satisfied but it’d be alot to set up and go diagnose! It would Conserve energy though, and fun to engineer as a tech
I have had good luck with vfd's on normal 3 phase Copeland scrolls. As long as you keep them above 45hz and don't go much over 70-75hz or exceed the maximum continuous amp rating I have had no issues driving them off a suction pressure transducer.
Many times have set up head pressure control for a water solenoid. A mister set up for temporary use works well. All your doing is cooling surrounding air at condenser inlet. Do not spray directly on condenser bundle. Works extremely well in dry desert areas especially in summer.
you always put out great content, i dont understand all of the things you do, but still interesting to watch and then listen to you explain things at the end, thanks! ~jeff
I have noticed that a lot of condensers are being designed with under sized coils. I know it has to do with cost savings for the end users but for what end. Save money at the beginning but spend a lot towards the end. With the smaller coils maintenance is crucial but what do we know we just fix the equipment.
Would it have changed anything if there was a fan motor placed directly over the condenser, like the standalone compressor units? I saw another comment here about having a swamp cooler blow air across that rack, but I know they don't last as long and have their own maintenance requirements + issues, and sounds like overkill to me.
I was just thinking of leaving a comment on one of your videos that you've brought up running misters/sprinklers on roofs just to get customers through a period before you could do more and it would be interesting for a layman to see how and when and why you do that.
Vr system do not do well with fluctuation power supply. They do not last long. They go out the whack very fast unless they have some kind of battery Bank. Maybe a Tesla powerwall for the equipment? I did a couple of those for a medical hospital
I noticed that you charge using the sub cooling and super heat numbers. Is it better than just adding so many lbs as the equipment label might suggest? The automotive a/c always get a label as to its charge. Given that you service units with varying charge sizes, it seems that the labeling is not a rule but just a guideline anyway.
I wonder what if you swap the system with a 2- stage system. Let’s say on cold weather you run only the first compressor and by warm weather the first and second compressor. Would that work here? I know it is not exactly the way it should but maybe if you calculate on outside temperature. Just a thought. Let me know please.
@LastSlovenian yes, the complexity makes it difficult to make the right decision but thinking about different solutions helps to grasp what is going on. The solution here is not simple here I know and the setup makes it even more complicated.
Instead of misting, why not place a swamp cooler in front of that condenser? Mastercool has one on wheels with a side discharge and you won't be calcifying the equipment with a mister.
I‘m guessing the equipment you‘re working on isn’t big enough for recip compressors? Bitzer recently developed a variable load system for their compressors that works like a EXV. It’s using the old technique of a solenoid valve that’s closing the suction gas canal in the cylinder head so the two cylinders under this head run without refrigerant and the capacity and amp draw go down. The new system pulses the solenoid valve like a electromagnetic EXV which gives you the opportunity to control the compressors capacity in very small steps from like 20-100% capacity. The advantages are that you don’t need an frequency inverter (VFD) and don’t have an issue with low rpms and low oil delivery.
Good question, we would be changing the original design of the equipment and in some situations we run the risk of head pressure that is to low to properly feed our expansion device. I might go into this further on my next live stream, Monday afternoon
Lol I couldn't help but laugh at the shut off on the wall at the checkup, looking so sad and depressed as it hung on by the conduit at the bracket. There's a certain level of irony with the poor maintenance focus by the customer.
As long as the coil stays moist, or water continously flows down it dirt shouldn't be a huge deal but it is California and we get sand and dirt in all our crevices
I know one thing happening right now due to the weather we are in right now. I hope the manufactures them oversize the condenser a little bit because this going to be critical from the heatwave unusual heatwave we're getting from this day forward this is important. The reason why I always oversize my condensing and compressor system it totally worth it. About to remember, it's not the mechanic fault. Usually 99% of the time is the customer. Do not listen. The customer is the engineer more than the refrigeration mechanic on the job. This is guaranteed
Increase the condenser fan speed change of fan motor. Increase the horsepower. See if you can put a bigger pitch blade it definitely help The condensing fan motor need to be bigger including the blades of the fan
Goodness gracious, that rack's airflow design is horrendous. What the heck would possess anyone into thinking that it's OK to have the airflow bypass the condensers when a single panel is removed? Having to switch off the entire rack just to inspect a single system is absurd. It almost feels like it's specifically designed to make half-arsed "PM" very easy, i.e. hose the condensers (with water going in the same direction as the airflow, which is suboptimal to get debris outta there) without removing a single panel. Not to mention the undersized condensers only add fuel to the fire (in the compressor that's running its little heart away, outside of its operating envelope). Rant aside, kudos to you for your ability to bring back these systems from the dead. I don't do any of this myself, yet I find your videos extremely interesting!
@@HVACRVIDEOS It was a commercial rooftop iced up solid. Went quickly through your shorts but can't find it now. I'd say I saw it within the last two weeks.
Put a piece of tape on the sight glass,and charge with head pressure and superheat,the unit is not a match set,go with experience not with sight glass,it will work fine with bubbles,but it will kill it being over charged.also make sure you have valves on discharge and suction,and temp valve ,so you do not have to recover,when you change compressors.nice work hope it helps.
You can only load the parts cannon so many times until the customer realizes they can only throw so much money at a train wreck. They need to LOOK at the forest and realize that fact.
@reyrodriguez1005 I'm not bashing air cooled condensers. Comercail applications water cooled condensers do work better to bring down head pressures so the systems work more efficiently. Just asking do you do hvacr
If your using a rack in restaurant with that many circuits, Why don't they use Parallel racks? A Hussman Protocol with a digital compressor would work perfect in that situation IMO.
Does anyone there use common ground source system instead of air condensers? The stability would solve so many problems, no condenser cleanings either. One heat exchanger in each unit only.
Can’t believe - ok I can - when they won’t pay you to fix it right or maintain it or replace it - but they want a deal on the service to keep the old horse limping along.
That condenser needs digital scrolls. I can't believe you didn't have help mobilizing during 105 deg day. You should have plugged those gaps in the cond coil.
IMO they barely got VFD working right for pumps and fan motors. It’s cheaper to replace that compressor every 4 years than deal with variable speed systems. Especially in an environment where the customer doesn’t maintain their systems regularly Too many variables, pun intended. I work with it all the time. Works great in near perfect situations. Ask me how many of those situations you actually run into.. Granted, traditional systems would also not break in near perfect situations. The difference is the cost and time to repair the two different kinds of systems. Variable speed being much higher usually.
A refrigeration rack is a nightmare Long-Term the customer going to lose but unique advise the customer. Another day somebody got to pay us one way or the other
I lost and I refuse to do a job because of the liability. It was a medical facility and they will not install a backup power system to protect my equipment. Plus a medical contract maintenance for the job that is required they have to meet my condition. If they don't I will not do the insulation. I will do the maintenance but doing the insulation without having the company meet the standard and then I will take the medical condition contract. If you do not stand for this condition you could be in a world of hurt with lawyers for this reason losing $2 and a half million on an insulation. It's all good. It's better than destroying my company
Poorly designed consenser coil- air takes path of least resistance so it will naturally draw more air from the top slab than the small bottom slab. Standalone condensing unit for WIF probably cheapest option.
Summer heat is finally getting more towards fall temps . I have 2 places with multiple junk roof tops units.. anyhow both have problems with the freezer units ..The refrigerator units in that rack I have no problems. It’s the low temp freezers. I wound up. Installing fan racks Directly on the freezer condensers coils while still allowing the top condenser fans to operate… Might sound like Mickey Mouse deal but the Copeland screw stop bypassing. Wired a Contact right off of the compressor so when the compressor comes on the individual fans come on. 🤷🏻♂️ It works. It solved my problems, but it still Mickey Mouse because them rooftop units are junk. Extremely poor engineering.😮😮
Oh my... I feel sorrow watching this. The most powerful organization in the world is fools. They have their own people everywhere. They don't do routine maintenence, don't demand proper sizing equipment for high temperatures.. Et cenetra...
I see you have a split unit air condition right up the condenser of the refrigeration. That definitely is not going to help. The heat is bouncing off the wall and going straight into the condenser. We got some serious engineer on that job. Who did the insulation before we got some top class world engineers
i know i'll get called a hack but i'd leave the compressor where it is and do the cheapest thing possible install a remote condenser somewhere behind... its been done before ... heck i've done it plenty of times ...
There's never enough money to fix something right but there's always money to fix something twice
Well said, lol
Often part of the problem is that upgrades and new equipment are paid for out of one pool of money but repairs are paid for out of a different pool of money.
only if techs are honest in the first place which what is wrong with the equipment for the business to spend money to fix 'something right'.
@justme5384 my work one of the walkends died and completely fell apart it's been a 2 month. Other fridges die all the time and the just fix it, sometimes waiting months for a part
OMG…i hear that. The best remedy is always too expensive, costly etc they say…yet with two or three visits back on the same issue equaled the proper fix cost.
If you want to make the variable speed units reliable, an oversized VFD makes a really big difference. In Germany, we regularly oversize them by 40 to 60%. A bigger VFD has almost no downsides other than costing more, but the bigger transistors and heatsinks handle the load a lot better, especially in summer. They also have bigger capacitors, so they can wear out a lot more until the unit fails, and are more robust. I have seen some of these oversized VFDs run for 25+ years without failing, while some "correctly" sized units pop after only 5 years. The bigger ones are also often available as passively cooled outdoor versions you can stick on the outside of the unit like a disconnect, and the danfoss ones can do pressure control with their built-in PLC, so you only need the VFD and a sensor, nothing else.
@LastSlovenian In Germany, most HVAC equipment is designed to last 20-30 years, so higher lifespan is usually a good idea if you want to keep your customers, even if it costs more to build and reduces efficiency a bit. If a unit blows a VFD after 7 years and fails after 10, you likely won't sell its replacement. Wall mount gas boilers and heat pumps are an exception, they usually only last 10-20 years, but wall boilers are cheaper and easy to change, and heat pumps are out in the weather and get hit with road salt, so they usually rust out, get hit by a minivan and/or blow a compressor before the electronics give up. Unfortunately, in the US, they don't seem to care as much about equipment lifespan, and if it gives up after 10 years, they just put a new unit in, likely from the same manufacturer, and aren't even angry it failed so soon.
@@unmountablebootvolume we do the same on supermarkets in the UK, 25kw compressors typically have 37kw inverters, only had a couple fail, and they were all down to plantroom ventilation failure, they don't like 45c+
First off....awesome video Chris. Second you can and do have options....yes the customer would need to approve it....but options do exist. You most definitely can run a VFD on a 3 phase compressor. As you stated there are things that need to be in place for it to operate properly. Luckily most of your bigger name drives have built in PID loops that can control it with some programming. By programming it's called scaling. ABB 580 drive for instance has 2 built-in PID loops and can be used as a stand alone controller. Some sensors/transducers and oil management and it'll run great. VRF as an example....if the compressor is running at low speed for an extended period will go into oil return mode. It opens the EEVS and ramps the compressor up to bring oil back. A Honeywell T775 is also another great stand alone controller with inputs, both digital and analog. You can use a VFD in high ambient conditions without it being a problem. You just have to size it correctly. There is a de-rating factor. Example...you have a 3hp compressor...high ambient....you'd want to de-rate the drive by 20%-25% to keep the inverter from overheating.
What that system could really use that is a lot less expensive than a drive would be a RAWAL DEVICE. It's has hot gas bypass and liquid injection all in one device. It gives you simple capacity control, not full blown....but 100 times better than nothing. You should look into them. I have worked on several and they do what they say they can
My heart went out to you on that roof with that temperature. Been there done that. I had a a commercial heat pump on a roof top the compressor doing the same thing. I had replaced it like two years prior. I refused to do it again, I told him to get a new unit, I don’t have enough help or I could have done it myself. He finally did get it replaced.
Sometimes it's OK to say no
Thumbs up on the video! We have a similar customer with that same junky rack and the same issues with the condenser sizing for the freezer. Their facilities was upset that we put a mister on the condenser and thought we missed that it needed cleaned, good to see they have the same issues elsewhere
YO CHRIS!. I am a Commercial Laundry service tech that does domestic appliance repairs. never thought I would do refrigeration but several of my domestic customers have asked me about refrigerator problems so I took a course this month and graduated with an EPA Universal license. I wish you were here in Texas so I can have the chance to work with you. I'll keep watching your videos and I have a pending order with TrueTech tools with your discount code.
Thanks bud
@@HVACRVIDEOS : So, when are you moving to Texas? 🤣😂
I guess I should be thankful for the irrigation at my property. Less about the lawn, but they are also misting condensers with water intermittently between 4pm and 9 am. Maybe that's how they have lasted 20 years....
Im actually getting ready to add booster fans on some of our oil coolers, im planning on doing a 10" muffin fan right on the condenser and a ranco thermostat. Daiken made their condensers super dense, which makes them efficient, but over time they are having flow problems despite regular cleanings. After 10 years, i finally convinced the company to get a swamp cooler for the chiller aisle, they ordered a second one 3 days after the first one showed up
Hi Chris your videos are very informative and is making me reconsider going back into the trade thanks for the video and information
Thanks, glad to be helpful
Ive been running into brand new rdt units with 448a doing the same thing. Im in texas so its 130+ degrees on the roof so head operating pressure is already outside the envelope.Had to run misters for walk in freezers for all the schools that bought those rdt 448a condenser units.
2 interesting things about them is you can spray a full stream of water into the condenser and it will not come out the back. Even woth the fan running (yes the condenser is clean)
2. The dtc valve copeland put on the compressors run opposite. So they close when they should open and vise versa.
Great job Chris.
I should say more than 55% of my customer are refrigeration top engineers. They know more than what I know and spend my lifetime doing when he tried to tell them. Hey, you should do this. They tell you no I know better. This is the budget. You going to do it this way. That's the customer. This is guaranteed
It’s sad to see that you don’t show the soldering/braising of the compressors anymore with the awesome music.
I understand that it would most likely cause calcium to build up on the condenser coil, my thought is to build a mister with a solenoid inline that is energized by a digital temp controller when the temperature rises above a preset ambient and is de-energized when it drops below a preset temperature. It may sound like a hack solution, I’m trying to think outside the box.
Great video. Thank you for sharing
Always great stuff !! Thanks Chris
Thanks
restaurants run hot hot water but what If you set up a water condenser to run a loop to the standard water heaters for hand washing and such, or pre heat the cold water coming in to the 100-200 gallon water heaters that are set for 160-180. have to set up a solenoid with a water stat or something. Then resort back to air cooled when satisfied but it’d be alot to set up and go diagnose! It would Conserve energy though, and fun to engineer as a tech
I have had good luck with vfd's on normal 3 phase Copeland scrolls. As long as you keep them above 45hz and don't go much over 70-75hz or exceed the maximum continuous amp rating I have had no issues driving them off a suction pressure transducer.
Many times have set up head pressure control for a water solenoid. A mister set up for temporary use works well. All your doing is cooling surrounding air at condenser inlet. Do not spray directly on condenser bundle. Works extremely well in dry desert areas especially in summer.
Thats an interesting idea
Hi
Chris
Great stuff
Thanks
you always put out great content, i dont understand all of the things you do, but still interesting to watch and then listen to you explain things at the end, thanks! ~jeff
Thanks for watching
@HVACRVIDEOS thanks for making great content for people who don't know ac stuff!
Great video. With your example of over sizing the condenser, could you use an EPR with it.
Digital scroll compressors will be standard in next 10 years for wic and WIF imo it’s a relatively simple form of capacity control
I like your videos. Just wondering about a suction line heat exchanger would help sometimes they're installed near the evap .
Hi Chris love the vids keep up the great work
Thanks Bud
@@HVACRVIDEOS any time Mate
Open ‘er up!
Imma do that
I have noticed that a lot of condensers are being designed with under sized coils. I know it has to do with cost savings for the end users but for what end. Save money at the beginning but spend a lot towards the end. With the smaller coils maintenance is crucial but what do we know we just fix the equipment.
Yes it's hot in the Caribbean even our york chillers having issues
Would it have changed anything if there was a fan motor placed directly over the condenser, like the standalone compressor units? I saw another comment here about having a swamp cooler blow air across that rack, but I know they don't last as long and have their own maintenance requirements + issues, and sounds like overkill to me.
Sizing for it's intended use for refrigeration also is how we do custom computing equipment for our clients.
I was just thinking of leaving a comment on one of your videos that you've brought up running misters/sprinklers on roofs just to get customers through a period before you could do more and it would be interesting for a layman to see how and when and why you do that.
Vr system do not do well with fluctuation power supply. They do not last long. They go out the whack very fast unless they have some kind of battery Bank. Maybe a Tesla powerwall for the equipment? I did a couple of those for a medical hospital
I noticed that you charge using the sub cooling and super heat numbers. Is it better than just adding so many lbs as the equipment label might suggest?
The automotive a/c always get a label as to its charge. Given that you service units with varying charge sizes, it seems that the labeling is not a rule but just a guideline anyway.
This summer was crazy
I wonder what if you swap the system with a 2- stage system. Let’s say on cold weather you run only the first compressor and by warm weather the first and second compressor. Would that work here? I know it is not exactly the way it should but maybe if you calculate on outside temperature. Just a thought. Let me know please.
@LastSlovenian yes, the complexity makes it difficult to make the right decision but thinking about different solutions helps to grasp what is going on. The solution here is not simple here I know and the setup makes it even more complicated.
Nice video
Thanks
Wouldn't that split unit condenser that u have near the water mister push hot air onto the big unit?
Instead of misting, why not place a swamp cooler in front of that condenser? Mastercool has one on wheels with a side discharge and you won't be calcifying the equipment with a mister.
I‘m guessing the equipment you‘re working on isn’t big enough for recip compressors? Bitzer recently developed a variable load system for their compressors that works like a EXV. It’s using the old technique of a solenoid valve that’s closing the suction gas canal in the cylinder head so the two cylinders under this head run without refrigerant and the capacity and amp draw go down. The new system pulses the solenoid valve like a electromagnetic EXV which gives you the opportunity to control the compressors capacity in very small steps from like 20-100% capacity.
The advantages are that you don’t need an frequency inverter (VFD) and don’t have an issue with low rpms and low oil delivery.
Would love it if you flashed up the temps in Celsius on the screen for us English 😊
when a compressor starts hissing its a *catpressor*
Lol
I feel like this summer has been so brutal here in the SoCal desert
I agree
@@HVACRVIDEOS
We broke our all time record of 124 degrees July 5th that was a fun day🤦♂️🤦♂️🤦♂️🤦♂️
You forgot to turn on caps lock!
Just messing up with you haha
Lol
Is that minisplit blowing straight into your condensor coil? That will kill the compressor on hot days.
Never easy when they want it fixed “good enough “ just keep billing them so long as they are willing to write the checks .
How do you know how much to charge on walk in coolers/freezers?
Did you recommend a newer unit with a higher SEER rating?
If you spray water on condenser-dont you deposit limescale on the radiator when water evaporates?
Yes, there is that potential
I remember this walk-in freezer had a grounded compressor from one of your older videos. It's a shame that this freezer is on its 3rd compressor.
Great 🎉 job
Thanks bud
Why not change the condenser fan motor and blade move more air over the condenser?
Good question, we would be changing the original design of the equipment and in some situations we run the risk of head pressure that is to low to properly feed our expansion device. I might go into this further on my next live stream, Monday afternoon
looked like there was a decent sized gap between the condenser coils. allowing a lot of air to bypass. @2:44 shouldn't there be some foam in there ?
Is it doable to add an extra condenser coil to this system, and add a head pressure control valve to maintain proper head pressure?
It may be doable but I don't want to get into that
Lol I couldn't help but laugh at the shut off on the wall at the checkup, looking so sad and depressed as it hung on by the conduit at the bracket. There's a certain level of irony with the poor maintenance focus by the customer.
When you do new installs, do you add the additional ports you would make use of in the future? Or does that mess with warranties?
Do you recommend the Fieldpiece SC480?
Yes
What is it when a compressor is bypassing? Thanks in advance
Do you mean what is happening inside the compressor when it's bypassing ?
As you use the mister won’t that wet the condenser coil slightly and make more dirt stick to it?
As long as the coil stays moist, or water continously flows down it dirt shouldn't be a huge deal but it is California and we get sand and dirt in all our crevices
Are there any roof units designed for high heat temp areas?
Good question, I'm going to break this down on my Monday night live stream
I know one thing happening right now due to the weather we are in right now. I hope the manufactures them oversize the condenser a little bit because this going to be critical from the heatwave unusual heatwave we're getting from this day forward this is important. The reason why I always oversize my condensing and compressor system it totally worth it. About to remember, it's not the mechanic fault. Usually 99% of the time is the customer. Do not listen. The customer is the engineer more than the refrigeration mechanic on the job. This is guaranteed
What the model number for the rack unit?
When you say the box is at 4 degrees do you mean Celsius or Fahrenheit?
Fahrenheit
Seen the issue before. I still would have cleaned cond. coil just to free up the grime from day to day dirt.
Can You mount another Fan on the outside of the Cabinet ??
A shade structure over the Whole unit to keep the Sun from baking it ...
Increase the condenser fan speed change of fan motor. Increase the horsepower. See if you can put a bigger pitch blade it definitely help The condensing fan motor need to be bigger including the blades of the fan
that poor split system also fans straight into the wall relocate that as well chris when they approve all the problems good luck.
The cold room wat too warm or not cold enough ? ? 😉
Did you have any calls where a walk in beer cooler decided it was suddenly a freezer? That'd be a fun (and potentially messy) call
Goodness gracious, that rack's airflow design is horrendous. What the heck would possess anyone into thinking that it's OK to have the airflow bypass the condensers when a single panel is removed? Having to switch off the entire rack just to inspect a single system is absurd. It almost feels like it's specifically designed to make half-arsed "PM" very easy, i.e. hose the condensers (with water going in the same direction as the airflow, which is suboptimal to get debris outta there) without removing a single panel. Not to mention the undersized condensers only add fuel to the fire (in the compressor that's running its little heart away, outside of its operating envelope).
Rant aside, kudos to you for your ability to bring back these systems from the dead. I don't do any of this myself, yet I find your videos extremely interesting!
Does anyone know what's tge subcool and superheat for a self contained units “prep units”?
20 deg s/h at compressor ,30 deg over ambient on condenser.IMHO.
Didn't you post a short recently showing an entirely iced up condenser? I don't remember seeing a full-length video with that failure though.
hmmm, that doesn't sound like something I would do but Ill double check with my team
@@HVACRVIDEOS It was a commercial rooftop iced up solid. Went quickly through your shorts but can't find it now. I'd say I saw it within the last two weeks.
Put a piece of tape on the sight glass,and charge with head pressure and superheat,the unit is not a match set,go with experience not with sight glass,it will work fine with bubbles,but it will kill it being over charged.also make sure you have valves on discharge and suction,and temp valve ,so you do not have to recover,when you change compressors.nice work hope it helps.
"walk in thawer" lol
lol, I see what you did there
lol
Sucks sometimes.. when you have to put a bandaid on a broken leg and put the horse back in the race..
You can only load the parts cannon so many times until the customer realizes they can only throw so much money at a train wreck. They need to LOOK at the forest and realize that fact.
You going to see outside temperature continue to rise. Why don't you switch over to water condensers you will triple the life of the compressors.
Than you’ll need a cooling tower. Way over kill for a small walk-in
@reyrodriguez1005 it is what it is. The whole rack needs to be switched over in my opinion
@@stephenbullock-yn3vh air cooled condensers have been plenty fine for decades, no need to reinvent the wheel
@reyrodriguez1005 I'm not bashing air cooled condensers. Comercail applications water cooled condensers do work better to bring down head pressures so the systems work more efficiently. Just asking do you do hvacr
@@stephenbullock-yn3vh yessir, I’m an industrial refrigeration mechanic. 17 years in
Just do a digital compressor instead of a VFD.
Looks like that condenser needs to be bigger or needs more air flow. Strap a fan on it! 😂
Lol
If your using a rack in restaurant with that many circuits, Why don't they use Parallel racks? A Hussman Protocol with a digital compressor would work perfect in that situation IMO.
Why not wrap a couple of cool lines around the compressor
Where’s your pop up canapé
Does anyone there use common ground source system instead of air condensers? The stability would solve so many problems, no condenser cleanings either. One heat exchanger in each unit only.
Good question, I'm going to try and discuss this on my next Monday night live stream
@@HVACRVIDEOS Awesome! Wondering/please ask chat; if there is any condensing units of this kind to buy?
“…And the sight glass is clear!” 🫡
Can’t believe - ok I can - when they won’t pay you to fix it right or maintain it or replace it - but they want a deal on the service to keep the old horse limping along.
That condenser needs digital scrolls. I can't believe you didn't have help mobilizing during 105 deg day. You should have plugged those gaps in the cond coil.
oh no sporlan IS EVERYWHERE
Quality. Integrity. Tradition.
@@aivansama6265 oh no
@@aivansama6265 this video is brought by P A R K E R and sporlan
just realised that parker Is everywhere
Freaking funny what we do for the MONEY !!!
Makes the world go around
IMO they barely got VFD working right for pumps and fan motors. It’s cheaper to replace that compressor every 4 years than deal with variable speed systems. Especially in an environment where the customer doesn’t maintain their systems regularly
Too many variables, pun intended. I work with it all the time. Works great in near perfect situations. Ask me how many of those situations you actually run into..
Granted, traditional systems would also not break in near perfect situations. The difference is the cost and time to repair the two different kinds of systems. Variable speed being much higher usually.
A refrigeration rack is a nightmare Long-Term the customer going to lose but unique advise the customer. Another day somebody got to pay us one way or the other
I lost and I refuse to do a job because of the liability. It was a medical facility and they will not install a backup power system to protect my equipment. Plus a medical contract maintenance for the job that is required they have to meet my condition. If they don't I will not do the insulation. I will do the maintenance but doing the insulation without having the company meet the standard and then I will take the medical condition contract. If you do not stand for this condition you could be in a world of hurt with lawyers for this reason losing $2 and a half million on an insulation. It's all good. It's better than destroying my company
Poorly designed consenser coil- air takes path of least resistance so it will naturally draw more air from the top slab than the small bottom slab. Standalone condensing unit for WIF probably cheapest option.
Those condenser fan motors are way too far from the condensers
Generally speaking, your Customers are, Penny Wise and Pound Foolish. It’s Difficult for them to look at the Entire Picture. 🤔👎
Margins are thin AF
@@TrumpsEarBandageexactly right
Sound like a evaporator fan is going bad or the blade is off balance
Summer heat is finally getting more towards fall temps . I have 2 places with multiple junk roof tops units.. anyhow both have problems with the freezer units ..The refrigerator units in that rack I have no problems. It’s the low temp freezers. I wound up. Installing fan racks Directly on the freezer condensers coils while still allowing the top condenser fans to operate… Might sound like Mickey Mouse deal but the Copeland screw stop bypassing. Wired a Contact right off of the compressor so when the compressor comes on the individual fans come on. 🤷🏻♂️ It works. It solved my problems, but it still Mickey Mouse because them rooftop units are junk. Extremely poor engineering.😮😮
Oh my... I feel sorrow watching this.
The most powerful organization in the world is fools. They have their own people everywhere.
They don't do routine maintenence, don't demand proper sizing equipment for high temperatures.. Et cenetra...
I see you have a split unit air condition right up the condenser of the refrigeration. That definitely is not going to help. The heat is bouncing off the wall and going straight into the condenser. We got some serious engineer on that job. Who did the insulation before we got some top class world engineers
6:49 that’s dark! - Riley (use my name please)
Like my Dentist says….keep raising prices till your workload decreases. That’s the only satisfaction you’re gonna get.
Lol
i know i'll get called a hack but i'd leave the compressor where it is and do the cheapest thing possible install a remote condenser somewhere behind... its been done before ... heck i've done it plenty of times ...