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Can’t think of how many pounds of low pressure refrigerant I’ve recovered /transferred etc from chillers .
Never ran a pump never froze a tube . Always left the recovery unit on overnight on vapour...

Ok so what refrigerant are you recovering this is very important .
Also the main thing here is did you remove all the liquid first ?
To freeze a tube you have to have a change of state of the...

No one has mentioned knowing what the design conditions are . Without that you pi&&ing in the wind .

I think it’s like dry running a starter for a Centravac on CH530 .you need to be in level 4 access ??? It’s been a while .
You need to go into binding view and find the condenser fan LLID there...

I would bet that every OEM tech has at some point worked on another OEMs chiller .
24yrs at Trane and worked on Carrier , York , Daikin , McQuay , Multistack , Air stack , Motivair etc etc .
Is...

I used to look after a 1000ton CV12 with common HR/Cond bundle . Did a Tristar/R123conversion and CH530 and purge upgrades in 2003 , she’s still running . Also a regular CV12 and PCV5 all converted...

Where’s the control panel , tell me you don’t have to duck under the other side of the compressor to see it ?
I would not not want to pull the oil sump on that puppy .

Install a real chiller , problem solved .

When I was at Trane one of the old parts guys had “a bible” 4” thick binder with all the gasket #s and some basic drawings on CVs and PCVs of various sizes . It was a very closely guarded book but...

There’s still a few of those old girls left , and some PCVs where I live . I looked after several of them did Tristar conversions on a couple , big heavy old clunkers but they just won’t quit and the...

You can lead a horse to water …….but you can’t make ‘em drink

If both machines are the same , upgrade one machine and keep the old stuff as spare parts .
For them to say they have no money we all know is horse s*#t …they only want to spend money where it gets...

But but but , we have no money , you know budget cuts and we had to pay for some fancy artwork in the foyer and the main boardrooms needed a new $60K waterfall live edge table and the all the $10K...

I threw so many of those old TDs away from doing panel upgrades it’s not funny . Kept e few for emergencies but eventually they all went in the garbage .
Now if I could just unload some of these...

There’s no way that debris came through the OB oil feed orifice it would plug it in a heartbeat . It looks like ground up O-ring material .
Open the oil sump cut open the oil filter and refrigerant...

What refrigerant is it running with .

Can’t help but notice that since everyone told him he has an oil issue he has gone AWOL. :grin2:

My question is a bit rhetorical.,.
Do you hang your gauge sets in the back of your service vehicle placed by a window ?
The sun will do a real number on anything with colour in a hurry .

To check the oil level on an RTAC you need to run it fully UNLOADED for 30 mins at least then check the oil level after it’s been off for 20mins or so .
Is that the procedure you used ?

Have you checked the oil level in the suspect circuit ?

How did you check the purge and what kind of purge is it ?

First question , comfort or process cooling ?
How big is the loop , size of building # of floors , air handlers ,two way or three way valves , variable or constant flow
Point is don’t blame the...

The chiller has no idea you’re coming out of free cooling , all it knows is it’s been asked to start .
A savvy BAS tech could easily write a program to feed info to the chiller via a remote current...

Demand limit is mainly used for demand limiting the chiller if your hydro company charges you extra (usually a lot extra) if you go over a certain “demand limit” in a billing cycle .
You just want...

The soft loading feature will do exactly what you want if you program it correctly .

RTAF speaks BACNET right out of the box , You will need the tech with Trane access software and the BAS tech to meet and set up the link . BAS need to provide address to Trane tech and he needs to...

Bad flow switch

Your post count has to be higher to post pics I think ?

I used to maintain a 500 ton CVHE heat recovery chiller . Single pass evap . They could dummy load the evap by cooling the exhaust air leaving the building . It ran 24/7 usually between 75 to 100%...

More info needed , make and model , type of starter and control system etc etc .

Your going to have to spend a lot of time there figuring out how hot you can run the heating condenser before surge . , it also depends on how much cooling load you have , you can’t make heat without...

Pictures would help , RTHBs are pretty old and us old timers need reminders of what they looked like .

You can lock out the circuit you’re not concerned about and then simply disconnect the load solenoid .
Setting the capacity limit at minimum limits the chiller to minimum capacity not the circuit ....

It has to be run unloaded to check the oil level . Unloaded running increases discharge temp helping to separate the oil from the refrigerant .POE oil is a lot more miscible in the refrigerant and...

Did you run the compressor fully UNLOADED for an hour before shutting down to check the oil level ?

Overcharge of oil or refrigerant or both , dirty condenser , condenser fan rotation reversed ,non condensibles .
Start at the beginning with the easy ones .

RTAC and RTAA totally different animal .

You shouldn’t need oil coolers for comfort cooling . They are only required below 38f leaving water if I remember correctly .
I did add them once to a package chiller that was being used to a...

Have you confirmed correct rotation of the compressor ? Just because the oil pump is correct doesn’t mean the compressor is .you can easily fool the PTs/CTs

You need a strong directional...

Don’t just assume .
Post a full log of the chiller including all pressures temps and EXV positions .
Do you know the design conditions for the chiller , is it water glycol, comfort or process...

I sure hope he did seeing as it’s 11yrs since he asked :angel:

See that’s ur problem . Freon molecules are smaller than refrigerant molecules so they squeeze by the valve .
You have the wrong refrigerant in the machine :grin2:

Was that one of the open drive R12 machines and it had a big handle on the front of the starter with a bunch of holes in it that you selected to match the load on the chiller . Kinda like the old...

What load was on the chiller , does the chiller have a combination oil pump/refrigerant pump ?

BUT BUT BUT …..controls guys know everything about chillers :grin2::grin2::whistle:

Is it excessive lift surge , or low load surge ?
If you lower your chilled water then you also have to lower your condenser water accordingly …
It’s all about lift .

Your oil pump isn’t running

Suction temperature sensor is failing probably .

I used to do a lot of work in pulp n paper plants and they pressurized all the control/electrical cabinets to keep the nasties out . Common practice in harsh environments .

If it does have the Carrier ISM module then chances are that’s the problem , they fail and depending on starter type (wye-delta/soft start etc) you will get weird alarms on the controller .