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Put a new EXV on a carrier 30GT-110 chiller. Having fault code 69 which is low superheat on circuit B. Circuit A is off. But have high superheat to compressors. Also replaced saturation sensor. Any ideas?

I realize I'm late to the party but I had problems with the "B" circuit EXV on our Aqua snap,Low super heat,cold liquid line, I checked the motor by using ohmeter, carrier says 52 ohms on each winding, I read open on the 2-4 terminals from the exv board. Long story short, I replaced the stepper motor , no go, Then It dawned on me the cable itself was bad. just something to look for in the future.

I have 30GT130-210 installed 1996 .
The thermistor sensors becomes moving items to replace when summer comes.
Condenser fan motors had more than couple replaced.
Had 1 EXV replaced due to grounded unit. When i opened the defective EXV, one of the copper wire in the stepper motor coil is out of the coil assembly and touching the body of the EXV. ( most probably factory defect in assembling the EXV unit).

2012 was the next time I had serious problems with the chiller condensers having multiple small leaks in the condenser units circuit A and B. All in the elbows situated in the middle of the unit ( 20 different leaks ). The culprit might be that the contractor did not install vibration isolators when the chiller unit was commissioned.
2012 the two EXV were replaced with a newer model, and been running fine up to present.
Never lost a single compressor O6E series up to now.
Our location where from May to peak summer July , ambient temp maxxed at 61 deg C noon time, and Dec to January where ambient temp goes down up to 13 deg C.
Chiller is providing ewt 15 deg C and lwt 10 deg C at chiller set point 10deg C. Chiller supplies 4 air handling units cooling the whole day old chicks hatchery plant, plus the cooling coils to the 16 incubator machines.

What version s/ware is in it??

It sould B 19+ Or 4 that matter 20+......email me and i will send it....

Originally Posted by mcguire07

One of my mechanics is working on a 30GT040 and has recently replaced the main board and the exv board. Everything works just fine when it cycles down normally but when it is shut off at the toggle and then restarted it trips the exv fuse because both exv's try to close at the same time and draws more than 5 amps. If he switches the toggle twice in rapid succession it restarts with no problems. Any one have any ideas?

One of my mechanics is working on a 30GT040 and has recently replaced the main board and the exv board. Everything works just fine when it cycles down normally but when it is shut off at the toggle and then restarted it trips the exv fuse because both exv's try to close at the same time and draws more than 5 amps. If he switches the toggle twice in rapid succession it restarts with no problems. Any one have any ideas?

Please make sure the wires are proper from old to new also check to make sure old board is compatiable with new exv as sometimes have to change board, I would get papaerwork on exv for proper wiring as sounds like possible wired wrong.

Gt 150

Make sure you have enough refrigerant in circuit.

cheers

Originally Posted by joey791

Just saw this thread, Ausccn, I downloaded what you posted, if there is any other software besides what you posted floating can I please have a copy.

Sorry Joey, thats the only on that I have.

Aus..

Just saw this thread, Ausccn, I downloaded what you posted, if there is any other software besides what you posted floating can I please have a copy.

Another request..

***EDIT*** Nevermind. Apparently I am blind as well as confused! I found your post and link seconds after posting this. Thanks!



Can someone email me a copy of that software to monitor the sensors and superheat with? It would be greatly appreciated!

(Ausccn, I tried looking for your previously mentioned posts, but did not find what I was looking for)

Email address is in my profile.

Thanks!

Ed_LMCO

Is this Flowtronics Manager software more useful than Network Service Tool?
Anyone successfully comunicated with XP?
I have the program and it runs on XP, not sure if its worth buying the loop convertor.
Im assuming its real time data thats faster than service tool.
Maybe I should start a new thread for this in Controls
Thanks

Wonder if this chiller is stil running since the thread is ............5 years old!!!!!!!!

Originally Posted by Jack Morris

Any idea where can I get The DOS based software called Flotronic Manager? And any other items that will be need

Jack see my post in this forum....

I worked on one flotronic chiller years ago and had the same reliability problems as everyone here describes. It ate compressors, sensors, EXV's etc... I called an engineer friend in Syracuse and he refered me to a project engineer who was one of the designers of that chiller... He admitted to all of the issues and went on to say that Carrier DOES (or did anyway) make a TXV retrofit kit for that chiller. It included the TXV's, some fitttings, and a new eprom for the CPU... It was little known (at that time at least) as the Carrier distributor had never heard of it, but when I gave them the part number the engineer gave me, it came up in their parts list.

As it turned out, I never did order it as the customer didn't want to spend the money for a conversion.. Instead they opted for 2 new compressors and new EXV's from a competitor,,,go figure... I heard all that new stuff didn't last more than a year....

Had it been MY chiller, I would have done the conversion in a heart beat....

Any idea where can I get The DOS based software called Flotronic Manager? And any other items that will be need

I put some of the first few in New England and went through all the early problems, we had a project we went to every day just to reset and start it with all the errors and alarms, had Carriers Engineers on the project many times and went through all the e-prom upgrades etc.

One interesting note is the smaller units 125 ton and under have very few problems, but the 200 ton and up are more problematic as all it takes is one set of discharge valves leaking back into the suction side and the comp sensor interpets the hot gas as high superheat Error on the 4 stage circuits. The EXV's seem to go after 10+ year old machines, most of my systems for chilled water are on 100% outside air applications so they have higher run time hours than other applications.

The Flotronic-II was better than the Flotronic-I, still amazes me on the Flotronic one till we switched to Trane, through the display you couldn't read the entering and leaving temperatures.

I agree, they were a little ahead of their time.Lets face it , most of the GTs are getting up there in years too. I actually have not replaced a ton of exvs on this particular model.Sensors is another issue.Once you learn your way around them, they arent too bad.

Originally Posted by CENAIR

This Carrier product 30 GT is probably one of the worst Chillers ever produced with all the problems with sensors and EXV, we service over 50 of them under contract and compared to other brands like Trane we maintain and install, the Carrier Flotronic Chiller has so many problems with the sensors and EXV's, and is probably the most unrelaliable Chiller product we have ever seen, install a nice Trane problem solved.

Probably due to being well ahead of it`s time.

This Carrier product 30 GT is probably one of the worst Chillers ever produced with all the problems with sensors and EXV, we service over 50 of them under contract and compared to other brands like Trane we maintain and install, the Carrier Flotronic Chiller has so many problems with the sensors and EXV's, and is probably the most unrelaliable Chiller product we have ever seen, install a nice Trane problem solved.

[i have a problems in 30gt,problem in ckt .a when i start the ckt a,a1 comp running normally,if start a2 after 5 min tripped in 66 code.