19XL actuator trouble

[chiller mekanik]

Got one that just stops in different positions.
I put it in service and initiate the vane test od the automated controls test & it works every time.
But, in temperature control it has a habbit of leaving the vanes open & causes low temp & then on start up (after reset)the operator reports high motor amps alarm.
He runs it through a test to get everything back to normal & the machine won't give him any trouble for a few days.

I've checked it to the extent of the service test & there doesn't appear to be any trouble with the vane or the actuator.
I've also checked all of my bulletins on the 19XLs & found one that describes my problem, but I'm confused about how to clean this potentiometer & the wiper arm.

I took the cover off & I see it, but I'm not sure what to do with it.

[freonrick]

try spraying electrical cleaner on it. replacement pots were available at one time through barbar coleman, now invenys?

[chilbrig]

There was a problem with the feedback pot on the actuator for these chillers, and most likely that is what your problem is. Do not waste your time trying to clean it. Just go ahead and order the new one and change it out. I believe there is a service bulletin on this.

[chiller mekanik]

I looked through all of the bulletins I could find on this & I found a clibration procedure that actually involved the pot on the black box.

Follwed the steps exactly & it works now.

The buletin did state that if the procedure was not a success to replace the actuator.

Does anyone think this might be temporary?

Hope it holds, comprehensive gig; I don't mind doing what has to be done but I would rather know if we're on board for another three years. Contract is up for renewal this spring.

[jon304j]

On the 19xl there is the solid state control. The pot issue was later on the xr/xrv. I think you will keep having an issue until you replace the motor. The controller isnt available seperatly thru RCD last time I checked.

[nmujjohn]

Agreed... if you are having issues with this control... Replace it. It will only show up later at the most inopportune time! Arrr...

[techtalker]

The 19XL has a 'black box' on it that converts a 4-20 ma signal from the PSIO controller to a pulse signal that opens and closes the actuator. The box uses a resistor that is on the side of the actuator as a feedback for the position.
The 19XR uses a feedback pot directly into the PSIO / CVC controls and then sends the open/close pulse directly back to the actuator.
The common problem is that the resistor used as a feedback signal can wear in spots causing the feedback pot to give a bad signal. Newer models are better at the wear factor. The problem here sounds like its on the resistor. depending on where the guide vanes operate, the feed back pot wears. When you calibrated the black box, it changed the point on the resistor where the guide vanes would normally hang up at. You may get a couple more months of operation out of the unit, but eventually the problem will show up again.

Order a new feedback pot for the actuator. RCD has the part number.

[Carrene #2]

"comprehensive gig; I don't mind doing what has to be done but I would rather know if we're on board for another three years. Contract is up for renewal this spring."

I've always been bothered by this approach. Fix the damned thing so, someone won't make you look bad and at a cheaper price. Not only that, don't give them any reason to get someone else ( other than $ & ¢ ).

[chiller mekanik]

r718,

Thats good advice & certainly words to live by.
After re-reading what I said, I can see how it looks like a pretty lousy approach.

I feel I should tell the rest of the story, but, before I do let me stress that I agree with what you are saying 100%.

This customer is not very loyal at all; our contract covers the chiller plant & thats it.
Anytime we get a call for an airhandler problem or anything thats not under the contract, we get worked over pretty good most of the time.
They never want to pay for all of the time, they prefer to furnish the parts & if anything is quoted, forget it, we almost always loose the work to a couple of other contractors trying to get their foot in the door.
Then theres the PM, anytime we're doing the PM, its always "can you check somthing while you are here?"
Of course, we play the game the best we can, we "dance", & it rarely gets us anywhere.
We recently spent alot of time doing an energy audit for them, I warned the salesman not to get too involved before he had a firm approval, a purchase order, a contract or the back of a napkin signed or anything.
Of course, they decided that the improvements we suggested were great ideas, but, the work was awarded to yet another low bidder.

If I sound bitter its because I am.
Again, I agree with what you said 100%, I just have a hard time giving & giving to someone who does not give back.

I hope you & everyone else can understand my lousy approach.

[Carrene #2]

Chiller Mekanik,
I hear ya! 85% of my work is full comprehensive contracts.
There's always some dancing going on somewhere.

[can]

Don't clean the POTENTIOMETER. It will very fast to be come bad! You must be replace it! the parts number is AD-718-701. Adjust it to 4 ohms (by measure brown and brown/block wire of the potentiometer)before install the wires to the terminal of the actuator! If still have the same problem after replaced it. Please replace the drive of the actuator. I'm sure you problem will fix!!!!!!!!!!!!!!!!!

[can]

Sorry, forgot to tell you the parts number of the drive for the actuator. It is HF39CB001

[bilmur]

Originally posted by chiller mekanik
Got one that just stops in different positions.
I put it in service and initiate the vane test od the automated controls test & it works every time.
But, in temperature control it has a habbit of leaving the vanes open & causes low temp & then on start up (after reset)the operator reports high motor amps alarm.
He runs it through a test to get everything back to normal & the machine won't give him any trouble for a few days.

I've checked it to the extent of the service test & there doesn't appear to be any trouble with the vane or the actuator.
I've also checked all of my bulletins on the 19XLs & found one that describes my problem, but I'm confused about how to clean this potentiometer & the wiper arm.

I took the cover off & I see it, but I'm not sure what to do with it.

[bilmur]

Originally posted by bilmur

Originally posted by chiller mekanik
Got one that just stops in different positions.
I put it in service and initiate the vane test od the automated controls test & it works every time.
But, in temperature control it has a habbit of leaving the vanes open & causes low temp & then on start up (after reset)the operator reports high motor amps alarm.
He runs it through a test to get everything back to normal & the machine won't give him any trouble for a few days.

I've checked it to the extent of the service test & there doesn't appear to be any trouble with the vane or the actuator.
I've also checked all of my bulletins on the 19XLs & found one that describes my problem, but I'm confused about how to clean this potentiometer & the wiper arm.

I took the cover off & I see it, but I'm not sure what to do with it. do you have the start-up manuel, on page 47 carrier gives you a full description of the starting torque and ramp-up potentiometers

[can]

Are your chiller lost oil before the vane have the problem?