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ISM parameters need to be configured and can be done through ICVC. Time to find the manual.

RTAC uses older Adaptaview screen and uses BCI2-C interface, RTAF uses UC800 and has a different bacnet interface. At least that’s my understanding.

Bacnet card to BAS.

https://www.trane.com/Resources/Partners/1ce8996a-a162-4101-b862-09bda7d80984/documents/RF-SVN02C-GB_0820.pdf

This is the older version, a newer card is available now but...

15 PSI Suction is 15 degree saturated evaporator temperature, 44 degree leaving water minus 15 degree SST means you have 29 degrees of approach. 1st thing that comes to mind is fouled tubes.

That Sporlan / Trane EXV is obsolete I believe, if it's just the plug that has melted you could wire it direct for the time being.

When ordering the new MBB you should have communicated the software version you had in order for RCD to send it out pre-programmed.

The last time I had that issue the EXV was not responding properly to command, I believe my 4 pin connection on top of the valve was not making proper contact.

Those fuses are fast blow, my coworker had very similar issues on the same chiller, power issues were the cause. Single phasing, brownouts and when the generator runs were noted to cause inexplicable...

Google is your best friend.

http://img.ebmpapst.com/products/manuals/S3G500AE3301-BA-ENG.pdf

Likely the condenser fan motor is an ECM motor that receives an enable signal as well as an analog input for speed control. ECM motors usually have nothing other than fuses on the power feed.

I don’t believe PCO5 controllers are backwards compatible, I think all the controllers need to be replaced with PCO5’s.

Assuming the charge will fit in the condenser and your valves hold… you should be able to utilize the pump down option with the liquid line closed then recover remaining refrigerant. Is there a...

Page 63.

https://www.carrier.co.th/m/23xl-3ss.pdf

More than likely a dead spot in your guide vane feedback potentiometer.

The one and only time I ever lost oil that fast was due to a failed low speed motor seal allowing oil to blow into motor cavity. Evidence was seen at motor cooling drain line schraeder valve. Usually...

Leaks are definitely more difficult to find but the purge system gives plenty of information based on pump out time to determine if a potential leak even exists. Typically leaks on low pressure...

Water or Glycol?

Have you verified your pressure transducers are accurate?

I have a few McQuays that run 24/7/365 for the most part also in cold climate. When crap happens which it always does, the tower bypass valve is usually a big help. The biggest issue I have with...

Sounds like your TXV bulb lost its charge to me.

I went to that link initially and this was my view. Do you actually get the manual?

I found this in my files, unfortunately it’s part of a massive file that is too large to share, hope this helps.

It primarily comes down to maintaining a positive pressure at the highest point in a building’s piping to expel air and prevent a vacuum condition drawing air into the system. Every 2.3 feet of...

The link below may help you with understanding the operation of the pilot and main TXV operation. I myself am leaning towards your main valve sticking intermittently. They used to rebuild or replace...

To get 900 tons of cooling you would have to reject at least 1125 tons of heat (probably more) with an 18 F temperature rise. Your current temperature rise of 4F at 900 GPM equates to 150 tons of...

18 degree temperature rise at 900GPM equates to 675 Tons of heat rejection, this would only get you 540 tons of cooling based on a 1.25 heat rejection factor on the chilled side. The numbers you gave...

https://cgproducts.johnsoncontrols.com/yorkdoc/160.75-rp1.pdf

Hope this helps.

Explain the pLan failure a little more. Is this an error message generated by windows on the touchscreen during boot up?

Seems like we’ve been here before...
https://hvac-talk.com/vbb/showthread.php?2218250-Trane-RTAC-275-will-not-start

Call a refrigeration mechanic!!

Faulty cable or a faulty component, you have to figure that part out yourself.

Divide and conquer is the best answer I can give you!! Obviously something is faulty on that string of components.

Disconnect 4 wire cable leaving panel to all field sensors / devices. See if panel mounted LLID’s are talking then. One bad cable or sensor can mess up everything. Familiarity is key and...

https://hvac-talk.com/vbb/showthread.php?1157541-RTAC-excessive-comm-loss

If you know how to use Techview, now would be the time. If not time to call someone familiar the system. Link above is for...

What is the exact message that comes up? If the entering / leaving sensors are reading wrong it can give an alarm that points You towards flow but can actually be the sensors. With just the pump...

I don’t have anything to help but this guys an expert LOL!!!

Saturated refrigerant temperature - Leaving water temperature = approach
Liquid line temperature provides you with subcooled refrigerant temperature below saturation.
To measure you need an...

Assuming this is the Multistack chiller from your other post.... the E-stop should be a digital input to the chiller control system which should disable all running compressors immediately. The...

http://www.pretempco.com/html/products.html
These are what York uses from factory. Just have to know what DP is supposed to be. I usually install 20 or 40 paid as replacements.

Unless you’re the only one that ever touched it and know otherwise, I would wonder if someone else has recovered the charge into a used cylinder that had some oil in it and unintentionally...

Being a new chiller you should have all design information readily available from the manufacturer. Most chillers today are designed for very low approach temperatures of 0.5 to 1.0 C but there are...

I think what you need to know is what “Approach” means. It is the difference between leaving water temperature and saturated refrigerant temperature. 6.7C - 5.5C =1.2C. This is a common measurement...

The equalizing pipe in my picture was an after thought installed the 1st summer of operation after issues arose with flooding basins. Then nobody thought about winter operation until it froze 3 years...

Balancing flow is my 1st concern. Secondly if the equalizing line is physically below the towers as shown I expect it will eventually become a huge pocket for debris to collect and difficult to clear...

Google is your best friend.

Hope this helps.

What some customers are willing to do kills me. We told them at time of installation to add a Dry Cooler for winter operation. They said nope, -17F the last couple nights might have convinced them...

A pilot operated solenoid valve utilizes water pressure to open the main port of the valve, chances are if it used to work and no longer does the valve is gummed up internally.

In regards to a...

https://estore.industrialcontrolsonline.com/Customer/incodi/specpages/valves.pdf

Unfortunately RichardL is no longer amongst us I’m sorry to say, his insightful responses are greatly missed by many of us here on this forum.