ucp2

[milkyway]

i am working with a

rtaa 0804xl01a3dobp


u00g02355

working on and 80 ton air cooled trane., issue is that machine will trip on low evap temp and other diag due to cooler weather., what i would like to do is upgrade the ucp2 , not to a 530 , just add more ct's, if possiable, and be able to enable soft load., i have called the trane office, they are supposed to get back with me on this., any suggestions? can this be done?., i would think to upload software for what i am wanting to do..,

[Healey Nut]

SAY WHAT ???????
What do Ct's have to do with low evap temp ???????
UCP 2 already has a soft load capability ( if you know how to use it )

[CoolFox]

As far as I am aware the Ucp on an RTAA is not upgradable like that. You could try low ambient mods like fitting condenser fan speed controllers.

[milkyway]

SAY WHAT ???????
What do Ct's have to do with low evap temp ???????
UCP 2 already has a soft load capability ( if you know how to use it )

i may have tried to explain alot in a little if that makes since.,., i was thinking to also add more ct's for unbalance , current ect.,.,

what i am tring to do is to be able to enable soft load on ucp2., had another tech tell me that i need to go into service settings and play with low water temp, low refrig temp, and leave water temp., that the three of these combined and configured correctly that will help the nusince call.,
now i can change the confiuration in those three to keep them as far apart,, but not freezing,, as possiable to avoid a call.,

[milkyway]

As far as I am aware the Ucp on an RTAA is not upgradable like that. You could try low ambient mods like fitting condenser fan speed controllers.

i was considering that as well., just didnt know what would be the most cost effective to customer to avoid the call he is worried about., actually , not very often does it really trip, however it does and thay dont want that.,

[Healey Nut]

The controller already has CT's so what will adding more do ????????
You have a refrigerant temp issue and your leaping in with both feet to look for what ????
Start at the beginning and look for the obvious problem first .

[mryan1]

As far as I am aware the Ucp on an RTAA is not upgradable like that. You could try low ambient mods like fitting condenser fan speed controllers.

This model should alreaady have low ambient fans, the fist 2 after the control cabinet, if not this is a good idea, under low ambient conditions this is your best bet

[mryan1]

i am working with a

rtaa 0804xl01a3dobp


u00g02355

working on and 80 ton air cooled trane., issue is that machine will trip on low evap temp and other diag due to cooler weather., what i would like to do is upgrade the ucp2 , not to a 530 , just add more ct's, if possiable, and be able to enable soft load., i have called the trane office, they are supposed to get back with me on this., any suggestions? can this be done?., i would think to upload software for what i am wanting to do..,

I'm just trying to figure out why your needing a software upgrade when there are other issues to address if your tripping low evap"meaning the weater temp is below 34 degrees for 300 seconds"

[chillerguy81]

i may have tried to explain alot in a little if that makes since.,., i was thinking to also add more ct's for unbalance , current ect.,.,

what i am tring to do is to be able to enable soft load on ucp2., had another tech tell me that i need to go into service settings and play with low water temp, low refrig temp, and leave water temp., that the three of these combined and configured correctly that will help the nusince call.,
now i can change the confiuration in those three to keep them as far apart,, but not freezing,, as possiable to avoid a call.,

I know your in Florida so maybe you're machine is not equipt with the low ambient options. I would also guess that you are running straight water through the chiller and not glycol? The other tech is correct that the configuration can be changed but those settings are normally only changed if your running a glycol mix through the chiller, default settings are for water. Have you checked other possible issues like water flow and refrigerant charge? I'm sure if you post the full model number, one of the Trane guys on here will be able to tell you what the ODA temp design is for this chiller, I forget without looking it up. Good luck!

[milkyway]

I know your in Florida so maybe you're machine is not equipt with the low ambient options. I would also guess that you are running straight water through the chiller and not glycol? The other tech is correct that the configuration can be changed but those settings are normally only changed if your running a glycol mix through the chiller, default settings are for water. Have you checked other possible issues like water flow and refrigerant charge? I'm sure if you post the full model number, one of the Trane guys on here will be able to tell you what the ODA design is for this chiller, I forget without looking it up. Good luck!

that makes since., i am certain that does not have the soft load option ., i am familuar with the ucp 1 and 2., i have 2 rthc with the ucp2 controller and the option is enabled, not only that but its there!!!.,,. idk, that is why i was asking.,.

and as far as the ct's ., i have read/seen somewhere that there were 2 sets of ct's on the power.,.,

u say u know what i say.,.,usay??

[Healey Nut]

Jayguy..... where are you when we need you ???? Mlkwal is looking for a copy of the IOM for the 80/125 ton RTAA with UCP2 style controls ..........do you have a copy written in Swaahilli you could send him ????

[jayguy]

Jayguy..... where are you when we need you ???? Mlkwal is looking for a copy of the IOM for the 80/125 ton RTAA with UCP2 style controls ..........do you have a copy written in Swaahilli you could send him ????

now THAT is funny!

this chiller does not have 'softload'...at least not like it is applied to the other screw chiller products.

Standard Ambient from the factory is 15F...Low Ambent Kit allows it to go to -10F. According to the model number, this unit is a Standard Ambient unit.

attached is the closest i could get to swahili

[milkyway]

now THAT is funny!

this chiller does not have 'softload'...at least not like it is applied to the other screw chiller products.

Standard Ambient from the factory is 15F...Low Ambent Kit allows it to go to -10F. According to the model number, this unit is a Standard Ambient unit.

attached is the closest i could get to swahili

nice

[york56]

attached is the closest i could get to swahili

You are quite the individual multi functional real men of genius we salute you mister swahili interperter.

[Healey Nut]

this chiller does not have 'softload'...at least not like it is applied to the other screw chiller products.

Jay is correct , but what I was referring to was you could send it a variable current limit signal over a set time period and do the same thing .

I still would like to know how adding extra Ct's will solve his low evap temp issue though ???

[jayguy]

...what I was referring to was you could send it a variable current limit signal over a set time period and do the same thing...

or a variable chilled water setpoint.

...I still would like to know how adding extra Ct's will solve his low evap temp issue though ???

it is a swahili thing...you wouldn't understand.

[Phisher]

Is a VFD installed on the chill water pump?

[emcontrols]

If im not mistaken the RTAA UCP2 has phase unbalance & phase reversal already, Just need to confirm its enabled under setup menu.

Ya'll are right its standard ambient unless low ambient option has been added.

What is your chw setpoint, what is the ambient condition its tripping????????

[Healey Nut]

it is a swahili thing...you wouldn't understand.


No ...i think I'm getting this Swahili thing now ........

So my refrigerant charge is contaminated ,,,,,,,,,,,,, so if I change the M1 circuit #2 contactor auxillary interlock it will fix it right ?????

[Phisher]

Anyone open a control panel just to find a rats nest of wires and wonder how that could happen?

graham, It's too cold in Canada for that Healey. I think it would be happier if it were parked farther south. I know a perfect garage in Va.