[referteacher]

A Carrier 19 DR chiller with a single 19DM compressor blew up it's Wye Delta starter. The customer would like a quote on a solid state (soft) starter. (Not an adaptable frequency drive). The local Carrier office is recommending against it. Does anyone have any experience, good or bad, they would like to share?

 

[absrbrtek]

Maybe the local Carrier office doesnt know how to convert it. I have converted 19DG from wye delta to Soft start with no problems. YT from VFD to Soft start with no problems and a few others, without factory support. I guess they feel the extra stresses of wye delta on the equipment willl generate work for them in the future. I don't see it as any big deal. JMHO

 

[LGtonnagetech]

Got to wonder why

DG & DM compressors are similar, but DM has that darned movable wall. Wonder if Carrier doubts compressors ability to make lift during slow acceleration.

 

[supertek65]

I am sure that "CAN" has a great answer.
It may be in Chinese, but will be the best answer

 

[steward]

I would suggest looking into a Benshaw SSS. Seems to be a good product.

 

[freonrick]

should not be a problem, soft start will have it up to speed in no time, once it is up to speed then it can load up just like a wye delta.

 

[RichardL]

IMHO the cheapest SSS is far and away better than the highest priced Wye-Delta starter on "Any" chiller...
Granted the inrush current will be higher but a small price to pay for the No contactor SSS...

 

[acjourneyman]

You do need to be careful when installing SSS's on older equipment,not because of the equipment, but because of the load center.The DM will handle the SSS very well, I did a conversion one time and set the ramp up time at 20 secs, older CVHA, and it took the building down because it couldn't handle 20 seconds of ramp up.Only happened the one time but it is possible on older buildings hurting for electricity.

 

[cntrlvalchiller]

We recently installed Benshaw soft starter on dk i believe ask chiller rob for details.

 

[stickerhead]

Put on a Benshaw with bypass contactors arrangement. We just put two 1000hp on two 19EF's. Works like a charm!

 

[poppop]

Carrier is very anal about their "Z" specs which are basically which starters and which manufacturers are "approved " for their equipment. They don't want to burden their ever shrinking engineering group with retrofitting every starter to every chiller. It's easier for them to say" these starters are approved for these chillers". It's a warranty thing.
We recently retro'd a Square D SSS to a 19XR. They said not to do it. Said rhey would not support it. We did it- it works fine. They just won't warranty it.
As long as the electrical details are worked out I don't see it as a problem.

 

[chiller rob]

acj i have had the same problem on a CV-6 (1962)... i think that is right... double ender with all the sight glasses...
keeps dropping the power to all the buildings in the campus...
increase or decrease the ramp? or install vfd for no inrush? or go back to ydelta?

the benshaw converstion to the sm or the 3200 is a easy move...

make sure to keep the existing signal resistor circuit... need that current feed back...

cheers...

 

[acjourneyman]

ChillerROb, you need to decrease the ramp up time so as not to keep the load demand high for a long period.I took this one to ten seconds and it never tripped again.And if you think about it the new units transition in less than 3 secs so anything between 6-10 seconds you would be fine.

 

[RichardL]

Truly some great information on this post by some great guys "Without" the first bit of flaming or name calling....Great job guys.

 

[chiller rob]

acj thanks...