This indeed was very helpful to know that those constant on-off-cycling is normal for such compressors. I was worried when I first heard our five of them constantly turning on and off. Technically it is not really on and off as the motor keeps spinning it just will not compress. One of ours started to make a strange noise last week, that one might die soon...
You are exactly right they do not turn on and off. Make sure to safely inspect any failed compressor you do not know why failed. We always have upcoming compressor trainings if you are ever interested. you can find something that works for you here refrigerationmentor.com/upcoming-courses/
Do you come across many unloaders stuck open? I've got a 15 ton that runs but doesn't pump refrigerant/suction and head are pretty much the same and it trips the motor protector on high winding temp. I pulled the gas and ordered the unloader as kind of a hail Mary but I get the feeling the compressor is trashed. I pulled the unloader today and it looks* clean and i see no debris. The hole is too small to try and blow through. I guess i could've tried to spray some solvent through the middle hole
Hi Trevor, I have a ZPD83KCE-TFD-522 operating in a ducted system, and the unloading is operating as you describe except there is a decent bang occurring as the compressor changes state from load, unload, load etc. The banging (not the compressor running noise) is loud enough to cause problems with neighbours! In Australia and the compressor is running on 415V three phase, but current difference from unloaded approx 8A and loaded is 10A. I would have expected the unloaded current to be less. Any idea what might be going on. I have a video of it happening but haven’t posted it anywhere yet.
@@RefrigerationMentorNot really concerned about the current, as that’s more an observation than an issue. The issue is the banging noise as it loads/unloads. It sounds like a large contactor that hasn’t been secured properly pulling in and releasing. Is that normal with these digital compressors?
My Liebert unit with a Digital scroll compressor is one of 4 in our lan room. It makes a horrible chattering noise and my gauges read no press differential when running. Plus it overheats almost immediately. This is our replacement unit. The local Liebert rep is not that familiar with these units and contacting Liebert has NOT worked at all. What might cause this violent chattering and self destruction right out of the box? Compressor model ZPD120KCE-TFD-465 thank you
Hey Trevor - I'm trying to specify a 25 ton water-cooled condensing unit with tandem scrolls of which one compressor is digital. I'm confused by which Compressor Controller and which System Controller is recommended by Emerson in this situation and is there a System Controller version that includes Communication via TCP/IP Ethernet, Modbus or ???
Hey Kelly, You need to have a 3rd party controller to control the IDCM digital controller. 1-5vdc. The EC3-D72 is TCP/IP I believe but old technology if they are still selling it. www.copeland.com/documents/ec3-d7x-digital-superheat-controller-24v-230v-ec3-d72-tcp-ip-communication-capability-operating-instructions-en-gb-5180968.pdf You could use a Johnson P450 to convert your suppy temp into the 1-5vdc signal for the IDCM. Good Luck.
Thanks Trevor - we are going with the Emerson XC643 controller. We actually have two coil circuits being fed by 2 water-cooled condensing units, each with tandem scrolls, of which one compressor in each tandem pair is digital.
I'm a little confused. I thought the digital scroll was unloading because of a differential pressure in the top housing. When the solenoid opens it makes a path to the suction and the discharge pressure would become suction pressure in the very top of the scroll?
For external piping models - When the solenoid is energized the volume on top of the piston is vented to the low side allowing the piston and fixed scroll assembly to move axial away from the orbiting scroll. When the solenoid is de-energized the piston is forced down and the scrolls are loaded axially The larger model scroll compressors employ a solenoid valve that is mounted on the side of the compressor that vents the intermediate cavity to the low side of the compressor during the unloaded state.
Trever, Shot in the dark, and forgot the model #, but I have a 2007 copeland digital scroll compressor-5 ton and can you tell me what the normal ohms for the solenoid coil would be?
Hello Trevor, will a ZFD25KVE operate as explained in your video, with the loading and unloading bit ? I am having some issues with one on a rack system that I am assuming is low on refrigeration because it isn't unloading, its running loaded 100%. Thanks in advance.
Have you read webapps.emerson.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=1327 webapps.emerson.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=1319 webapps.emerson.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=1328
Same problem to me the scroll starts and then heat and by pass the motor is running by no suction no discharge its stable what to do. THIS MODEL I DONT LIKE😢
@@RefrigerationMentor tomorrow will check the metering device, suction is low 0.3bar and discharge is 15 bar for r404a 3 phase 8 ton old compressor zb58kqe-tfd-551 hence I think may be flow is restricted at the TXV side and as I start the compressor it's make's good compression and then with in 4 minutes it start to by pass internally and becomes hot
Hello sir I brought digital scroll comp model ZRD72KC-TFD-433 IS RUNNING on 15 amps and after that he become very hot and from internal overload its trip can u pls explain me the problem as soon as possible. Thanks
We need way more information. Model number and amps will not work for any type of troubleshooting. How to figure this out is you need hard data. what is your application and refrigerant? What is the size of your condenser? How many evaporators? What is the capacity of the evaporator/s? What size TXV is installed? How much refrigerant does the system hold? What is the receiver level of it has one? What is the suction and discharge temperatures and pressures? What are the amps, volts, superheat at the evaporator, superheat at the compressor, what is the oil level? What’s controlling the digital and how is the digital input set up? Is the suction insulated? What is the subcooling leaving the condenser and also entering the TXV? How often is it unloading? What is the size of the suction, discharge and liquid lines? What are the lengths and vertical risers? Than plot some of this information on a compressor performance chat and you answer all of these you will find the answer out on your own. Good luck.
![BLACK BAG - Official Trailer [HD] - Only in Theaters March 14](http://i.ytimg.com/vi/Du0Xp8WX_7I/mqdefault.jpg)
This indeed was very helpful to know that those constant on-off-cycling is normal for such compressors. I was worried when I first heard our five of them constantly turning on and off. Technically it is not really on and off as the motor keeps spinning it just will not compress. One of ours started to make a strange noise last week, that one might die soon...
You are exactly right they do not turn on and off. Make sure to safely inspect any failed compressor you do not know why failed. We always have upcoming compressor trainings if you are ever interested. you can find something that works for you here refrigerationmentor.com/upcoming-courses/
Yes I heard the sound on another related post you created. Thanks as always!
It is always great to get your input. Thanks for listening
Do you come across many unloaders stuck open? I've got a 15 ton that runs but doesn't pump refrigerant/suction and head are pretty much the same and it trips the motor protector on high winding temp. I pulled the gas and ordered the unloader as kind of a hail Mary but I get the feeling the compressor is trashed. I pulled the unloader today and it looks* clean and i see no debris. The hole is too small to try and blow through. I guess i could've tried to spray some solvent through the middle hole
@@ryans5473 if you take the solenoid off and it doesn’t load up it is usually the compressor. Sometimes the unloaded tube inside melts.
@RefrigerationMentor yeah, it was a bad compressor. Thanks for the reply
Hi Trevor, I have a ZPD83KCE-TFD-522 operating in a ducted system, and the unloading is operating as you describe except there is a decent bang occurring as the compressor changes state from load, unload, load etc. The banging (not the compressor running noise) is loud enough to cause problems with neighbours!
In Australia and the compressor is running on 415V three phase, but current difference from unloaded approx 8A and loaded is 10A. I would have expected the unloaded current to be less.
Any idea what might be going on. I have a video of it happening but haven’t posted it anywhere yet.
Those amps may be correct. You will have to Plot it on the Perfromance chart of the compressor.
@@RefrigerationMentorNot really concerned about the current, as that’s more an observation than an issue. The issue is the banging noise as it loads/unloads. It sounds like a large contactor that hasn’t been secured properly pulling in and releasing. Is that normal with these digital compressors?
Depending on the model They have a ~10-15db increase when they unload. If it’s banging louder than that you should call the manufacturer
My Liebert unit with a Digital scroll compressor is one of 4 in our lan room. It makes a horrible chattering noise and my gauges read no press differential when running. Plus it overheats almost immediately. This is our replacement unit. The local Liebert rep is not that familiar with these units and contacting Liebert has NOT worked at all. What might cause this violent chattering and self destruction right out of the box? Compressor model ZPD120KCE-TFD-465 thank you
It is hard to say it could be one of a dozen plus things. Was the compressor fully loaded when this chattering was happening?
Have plenty close control units with these
If they are sized, installed and setup correctly in a variable load system they work good.
Hey Trevor - I'm trying to specify a 25 ton water-cooled condensing unit with tandem scrolls of which one compressor is digital. I'm confused by which Compressor Controller and which System Controller is recommended by Emerson in this situation and is there a System Controller version that includes Communication via TCP/IP Ethernet, Modbus or ???
Hey Kelly, You need to have a 3rd party controller to control the IDCM digital controller. 1-5vdc. The EC3-D72 is TCP/IP I believe but old technology if they are still selling it. www.copeland.com/documents/ec3-d7x-digital-superheat-controller-24v-230v-ec3-d72-tcp-ip-communication-capability-operating-instructions-en-gb-5180968.pdf You could use a Johnson P450 to convert your suppy temp into the 1-5vdc signal for the IDCM. Good Luck.
Thanks Trevor - we are going with the Emerson XC643 controller. We actually have two coil circuits being fed by 2 water-cooled condensing units, each with tandem scrolls, of which one compressor in each tandem pair is digital.
I'm a little confused. I thought the digital scroll was unloading because of a differential pressure in the top housing. When the solenoid opens it makes a path to the suction and the discharge pressure would become suction pressure in the very top of the scroll?
For external piping models - When the solenoid is energized the volume on top of the piston is vented to the low side allowing the piston and fixed scroll assembly to move axial away from the orbiting scroll. When the solenoid is de-energized the piston is forced down and the scrolls are loaded axially
The larger model scroll compressors employ a solenoid valve that is mounted on the side of the compressor that vents the intermediate cavity to the low side of the compressor during the unloaded state.
@@RefrigerationMentor Thanks for the explanation 🙏
Trever, Shot in the dark, and forgot the model #, but I have a 2007 copeland digital scroll compressor-5 ton and can you tell me what the normal ohms for the solenoid coil would be?
Sorry, I do not remember.
Hello Trevor, will a ZFD25KVE operate as explained in your video, with the loading and unloading bit ? I am having some issues with one on a rack system that I am assuming is low on refrigeration because it isn't unloading, its running loaded 100%.
Thanks in advance.
Have you read webapps.emerson.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=1327
webapps.emerson.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=1319
webapps.emerson.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=1328
@@RefrigerationMentor just came back to this video, will check these out ASAP !!!
where is the podcast?
They are now in the description. Thanks Mark.
Same problem to me the scroll starts and then heat and by pass the motor is running by no suction no discharge its stable what to do.
THIS MODEL I DONT LIKE😢
Did you do a performance check and match it up to the operating envelop and electrical curve chart or performance chart?
@@RefrigerationMentor tomorrow will check the metering device, suction is low 0.3bar and discharge is 15 bar for r404a 3 phase 8 ton old compressor zb58kqe-tfd-551
hence I think may be flow is restricted at the TXV side and as I start the compressor it's make's good compression and then with in 4 minutes it start to by pass internally and becomes hot
Hello sir I brought digital scroll comp model ZRD72KC-TFD-433 IS RUNNING on 15 amps and after that he become very hot and from internal overload its trip can u pls explain me the problem as soon as possible. Thanks
We need way more information. Model number and amps will not work for any type of troubleshooting. How to figure this out is you need hard data. what is your application and refrigerant? What is the size of your condenser? How many evaporators? What is the capacity of the evaporator/s? What size TXV is installed? How much refrigerant does the system hold? What is the receiver level of it has one? What is the suction and discharge temperatures and pressures? What are the amps, volts, superheat at the evaporator, superheat at the compressor, what is the oil level? What’s controlling the digital and how is the digital input set up? Is the suction insulated? What is the subcooling leaving the condenser and also entering the TXV? How often is it unloading? What is the size of the suction, discharge and liquid lines? What are the lengths and vertical risers? Than plot some of this information on a compressor performance chat and you answer all of these you will find the answer out on your own. Good luck.