Very good video, your company should consider very lucky to have employees like you, and we are lucky too to have you making this videos,i I’ve been learning so much, thank you very much, and Gob Bless always.
I feel your pain. Tech. I have been on the roof at 2 am of a Target many times. Walking in deep snow, in the rain, high winds tripping over a gas line and target's engineners they install these racks, that if you have to work on the boards that are on the doors, they get wet in the rain
Great troubleshooting work as usual with you, Rookie Refrigeration. Good job. I was thinking to check the defrost times on the defrost timer. I'm not really sure how it is in your region, but here in the deep South, the humidity in the Summer makes the air so thick, it's like you can cut it with a knife. The high latent load requires more defrosts. When the unit is comimg out of defrost in the hot part of the Summer day, the high heat load being absorbed in the evaporator from the newly defrosted coils plus that walk-in box having its door opened more in the daytime allowing the high sensible load to enter into the box will translate into a high suction pressure when first coming out of defrost mode into refrigeration mode which then will translate over to a higher than normal head pressure. Combine all of that with the high outside daytime ambient and the head could reach the high head pressure safety cutout setpoint before the system pulls down the total box load. I'm not saying that's what happened in your case here in this video. I'm just coming up with possibilities. You may not have defrost times set for daytime operation out there in your region. But, again, here in the deep South, the Summer latent load is very high, so more defrosts are needed.
Old school here 40 yrs and since you never put gage's on and checked everything else. I suspect your a little overcharged with headmaster and you couldn't pump down in defrost tripping head. Or you come out of defrost and was so loaded same thing happened. Check the charge! Great channel and keep up the learning. After 40 yrs I still learn something new nearly everyday!!
Doyle Wells yeah that makes sense. I checked the system the day afterwards and it was running perfect in the afternoon. I’m still puzzled as to why it tripped. 🤷♂️
@@rookierefrigeration4357 I was thinking that peanut relay might be sticking but Doyle's theory sounds more logical. But you have put gauges on you just didn't do pump down test right.
@@hvactechpr7872 Thanks for getting back to me. "A broker"? - I didn't know there was such s thing. So you're an HVAC subcontractor that works on a by-job basis?
@@hg2. they sell used commercial refrigeration (reach in cooler/freezers, sandwich stations and basically anything refrigerated for restaurants/pizzerias and bakery) yea I am a 1099 contractor or 480 (professional services) and i have 4 restaurants that I do ac reefer and ice machines
good stuff man. Im assuming this single unit walk in freezer has a pump down defrost. sometimes what could happen is when the unit goes into defrost and the receiver cant handle the pump down the head pressure will rise and cut off on HPC. Most of time from when we add a winter charge in the cold weather, theres already X amount of gas in the receiver and now its not able to fully pump down in defrost because its basically exceeding the receiver capacity. just something to look out for.
Late to the party, and not an hvac tech... But could it also be due to some air inside the system? It would try to push the air in the receiver, which stay in gaz so the pressure sky rocket?
thephantom1492 sure air and non condensables can cause that as well, but I would imagine it wouldn’t be sporadically. I think he would have seen that same issue even after he reset the HPC
MaintenanceDogHouse24/7 it depends on who up work for. We do commercial refrigeration so we could potentially be out all night and all we do is send an email saying we won’t be in. That’s all. Other companies may not be so nice. Lol. Just depends bro
Squirtle Hvac yeah, I was on the phone with a senior tech and he advised me to shut a few off to manage the load on the compressors. It probably didn’t need it,but I’m so green at racks, I just listen to my mentors.
Rookie Refrigeration haha I’m an apprentice too so I feel you. Hey I recommend you buy this book called. Commercial refrigeration for Air Conditioning technicians. Volume 2 by dick wirz. Helped me a lot. Thanks for the reply
How long have you been in the trade man? I’m in my first year of commercial ref up in Canada and I deal with a lot of Walmart racks. Lots to learn but it’s always interesting.
@@rookierefrigeration4357 lol... all of them? but mostly the first... You're just in a completely different league than anything I've seen... an entire room full of compressors and a centralized computer that controls all of them... is that several systems each with its own compressor, or one large system that needs multiple?
emolatur yes, this is a rack system. So basically you have multiple compressors on a single discharge header with 1 condenser and many different cases. Then they all return to a single suction header back to the compressors. They all share the same refrigerant, so probably about 1000lbs.
Very good video, your company should consider very lucky to have employees like you, and we are lucky too to have you making this videos,i I’ve been learning so much, thank you very much, and Gob Bless always.
Sal Castillo thank you
I like it . Straight to the point start from powe then think your way through the system
I feel your pain. Tech. I have been on the roof at 2 am of a Target many times. Walking in deep snow, in the rain, high winds tripping over a gas line and target's engineners they install these racks, that if you have to work on the boards that are on the doors, they get wet in the rain
Good content, you are a excellent technician. You dont give up. New subscriber
Thank you kind sir. I appreciate you watching and the sub👍👍👍
Great troubleshooting work as usual with you, Rookie Refrigeration. Good job. I was thinking to check the defrost times on the defrost timer. I'm not really sure how it is in your region, but here in the deep South, the humidity in the Summer makes the air so thick, it's like you can cut it with a knife. The high latent load requires more defrosts. When the unit is comimg out of defrost in the hot part of the Summer day, the high heat load being absorbed in the evaporator from the newly defrosted coils plus that walk-in box having its door opened more in the daytime allowing the high sensible load to enter into the box will translate into a high suction pressure when first coming out of defrost mode into refrigeration mode which then will translate over to a higher than normal head pressure. Combine all of that with the high outside daytime ambient and the head could reach the high head pressure safety cutout setpoint before the system pulls down the total box load. I'm not saying that's what happened in your case here in this video. I'm just coming up with possibilities. You may not have defrost times set for daytime operation out there in your region. But, again, here in the deep South, the Summer latent load is very high, so more defrosts are needed.
Old school here 40 yrs and since you never put gage's on and checked everything else. I suspect your a little overcharged with headmaster and you couldn't pump down in defrost tripping head. Or you come out of defrost and was so loaded same thing happened. Check the charge! Great channel and keep up the learning. After 40 yrs I still learn something new nearly everyday!!
Doyle Wells yeah that makes sense. I checked the system the day afterwards and it was running perfect in the afternoon. I’m still puzzled as to why it tripped. 🤷♂️
@@rookierefrigeration4357 I was thinking that peanut relay might be sticking but Doyle's theory sounds more logical. But you have put gauges on you just didn't do pump down test right.
Nice find I'm binge watching your videos to remember my ol' reefer days
What are you doing now?
@@hg2. I work for a broker repairing refrigerated equipment makes end meet
@@hvactechpr7872
Thanks for getting back to me.
"A broker"? - I didn't know there was such s thing. So you're an HVAC subcontractor that works on a by-job basis?
@@hg2. they sell used commercial refrigeration (reach in cooler/freezers, sandwich stations and basically anything refrigerated for restaurants/pizzerias and bakery) yea I am a 1099 contractor or 480 (professional services) and i have 4 restaurants that I do ac reefer and ice machines
@@hg2. yeah I am sorry for the long description lol
Good stuff man, appreciate the content as there is not many rack videos out there. On call myself this weekend. \m/
Jeremy Maxwell thank you bro. As I become a better RACK TECH I’ll try to get better content out. Thank you for watching.
Phew... Have to be on your toes to keep up with these.
Great teaching
Awesome work dude
Keep it up! 😎😎
Thank you. Thanks for watching bud.
I do the electrical for clubs to and they always mad when you get the shit up and going and they have to do there job them
Lmao. Very true
I enjoy working in targets. I did all the Pfresh installs out here years ago
good stuff man. Im assuming this single unit walk in freezer has a pump down defrost. sometimes what could happen is when the unit goes into defrost and the receiver cant handle the pump down the head pressure will rise and cut off on HPC. Most of time from when we add a winter charge in the cold weather, theres already X amount of gas in the receiver and now its not able to fully pump down in defrost because its basically exceeding the receiver capacity. just something to look out for.
Late to the party, and not an hvac tech... But could it also be due to some air inside the system? It would try to push the air in the receiver, which stay in gaz so the pressure sky rocket?
thephantom1492 sure air and non condensables can cause that as well, but I would imagine it wouldn’t be sporadically. I think he would have seen that same issue even after he reset the HPC
Hey man, thanks for sharing your videos. Keep them coming please.
Min 12:00
(Come back later and review the steps of this experiment.)
How many techs your out fit have? And how yrs your most sr. techs have in?
Great video! Thanks for posting...
We are a large branch is Dallas. Probably about 50 techs. Thanks for watching bud.
Do you have power to roof condenser? Are fans operating? . check for pressure difference on inlet strainer to condenser.
anyone knows where is the third part of this section ? anything about HVAC REFRIGERATION LIFE: On call Service Calls Part 3?
I don’t think there is one. Lol.
Lol. “Sorry, I’m just here to fix shit”...
I know right. Lol. Thanks for watching bro.
How does on call work in the HVAC industry......let’s say you have a busy night do you guys get the next day off or do you guys still come in?
MaintenanceDogHouse24/7 it depends on who up work for. We do commercial refrigeration so we could potentially be out all night and all we do is send an email saying we won’t be in. That’s all. Other companies may not be so nice. Lol. Just depends bro
Rookie Refrigeration appreciate the reply, discovered your channel yesterday, hitting subscribe 🤙🏼
Seems like you checked everything on that wif condenser unit. Did you find anything on that unit after?
Never found out bro. It’s still running.
The rack room is very loud!
pepsicolachao yup
Why did you close some the suction lines on the rack? Load was too high for compression?
Squirtle Hvac yeah, I was on the phone with a senior tech and he advised me to shut a few off to manage the load on the compressors. It probably didn’t need it,but I’m so green at racks, I just listen to my mentors.
Rookie Refrigeration haha I’m an apprentice too so I feel you. Hey I recommend you buy this book called. Commercial refrigeration for Air Conditioning technicians. Volume 2 by dick wirz. Helped me a lot.
Thanks for the reply
@@squirtlehvac8962 great book
Squirtle Hvac yeah bro, I bought that book before I decided to get into Refer. I read alot bro, so that book is amazing
As a person currently in tech school here n Irving, tx How much do a job like this start off. I want to go this route.
All depends on your ability to learn and move forward. It’s really hard to say. Take a few interviews and find out.
How long have you been in the trade man? I’m in my first year of commercial ref up in Canada and I deal with a lot of Walmart racks. Lots to learn but it’s always interesting.
I’m about to hit 3 years. Like in June.
How long did you work that day?
I don't even remember. Probably from 7a- midnight. I think.
@@rookierefrigeration4357 I don't think I could work sixteen hours straight...
@@douro20 sometimes you have to. Refrigeration is tough during the summer
what... the hell... is that thing?!
Umm. Which one!???😂
@@rookierefrigeration4357 lol... all of them? but mostly the first... You're just in a completely different league than anything I've seen... an entire room full of compressors and a centralized computer that controls all of them... is that several systems each with its own compressor, or one large system that needs multiple?
emolatur yes, this is a rack system. So basically you have multiple compressors on a single discharge header with 1 condenser and many different cases. Then they all return to a single suction header back to the compressors. They all share the same refrigerant, so probably about 1000lbs.
#69 thumbs up
Why would you create content if you’re not showing all the steps? You must work for TDI.