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Funny how they can't upgrade or replace the machine. Let it die, and we got plenty of money for a rental this summer. I actually watched a military base rent a chiller for two years because they...

It seems to me that I had a similar problem on a 30RB that ended up being the Scrolling Marque bouncing the LEN communications. If you have a navigator on the machine leave it connected and...

Woody Clark was a great engineer and support source. Most of all he was a friend to every one of us. Helped me out many times and likewise was open to suggestions for improvements. I could tell...

Distributors can sell either the loaded software SCPM or a blank SCPM. The reason for the blank SCPM is it can be loaded in the field for different machine applications, such as having a blank module...

Nuclrchiller brings up a very important point about the refractometer. Your location and air cooled equipment combination means you should KNOW what your protection level is. I used one obtained from...

Depending on what type of chiller you have, you should at a minimum record your operating conditions once daily, preferably around the same time of day. Inlet and outlet water nozzle temperatures and...

I use to see this quite often in situations of not maintaining glycol concentration. Typically the saturated suction temperature would be just below the concentration of glycol frosting point. I...

The modules are sold either with or without the specific instructions for the input/output channels. You probably have the "blank" modules which need to be downloaded specifically to the serial...

I have seen pump inlet strainers deteriorate and pieces lodge into chiller tubes. Ultimately the tubes failed an eddy current test or worse began leaking. If you rely upon a pump strainer to protect...

The old thoughts generally placed a stop major internal inspection at around 75,000 hours, to measure clearances and thrust depth. I have seen XR with over 100K hours and never opened up. The oil...

First thing to check, is the circuit leaking refrigerant. If you think it is low on refrigerant then look for a leak first. The condensor approach appears to be too wide, are the tubes clean and...

Having spent a number of years evacuating large systems and chillers, I 'll offer a few thoughts. I spent most of my years using a 6 CFM and a 2 CFM pump. I kept all of my hoses and seals in good...

Check to see if an Eddy Current inspection was performed. That report will have your tube count.

Years ago, I am dispatched to a rural hospital with one blue oval low pressure machine down and out. Plant maintenance asks me if I can get it running quick because they have patients that may die....

Oil return is accomplished by capturing oil from the cooler refrigerant surface into the discharge section of the volute. When the machine is loaded up to 40% or higher refrigerant velocity carries...

You can find quite a bit of information at this document. https://www.xylem.com/siteassets/brand/bell--gossett/resources/teh-908a-hydronic-system-design-with-the-bell--gossett-system-syzer.pdf .

"but service and maintenance and cost of repair parts will be huge in case of VFD" In the case of slide valve modulations over "almost excessive" varying loads the potential for repairs tend to...

I used tackle boxes for many different things. One for copper fittings, another for brass fittings and schrader stubs. Fuses and anything else that tended to stray around the van. If it breaks or...

The plate is usually on the tube end sheet at the top left corner looking toward the cooler water nozzle connections.

"Fluffy" Three years into my career I had a residential call for outdoor unit inoperable. I found the outdoor unit power wiring was exposed romex from the exterior wall to the unit, with insulation...

I will make a few suggestions, based upon your post. Once you have secured all known leaks, leak tested and feel sure you are leak free, pressurize with nitrogen passed thru a new 082 (or similar)...

JayGuy i had a Carrier EB start losing refrigerant about 5 months after an annual with Eddy currents With no leaks found externally I decided to pull another Eddy current. When i dropped the water...

The EXV board pulses voltage in sequences to the bi polar windings. Using a digital meter sometimes is misleading so the use of an analog meter indicates better. My old Simpson 250 set on DC volts...

I want to add something to this that may or may not have anything to do with this. Brazed plate heat exchangers are quite susceptible to fouling due to the close passages between plates. If dirty...

It is suspicious that you had no flow of fluid thru the cooler(s). How are the units configured for pump control? No control with BAS in command of pump(s)? or BAS starts chiller and chiller starts...

Review alarm history in both units, by writing down in chronological date and time of each unit. (check your current date and time and compare with actual time and date). Between the two of them...

I have that same Imperial set and used it for 40 years. Still have it and it still works fine.

I would closely examine the swag punch to be sure the metal is completely smooth. Try some 400 grit sandpaper on the punch to get a "mirror" finish. Be sure the tubing is loaded straight also. I...

I agree with the "hate this System" comment. The BAS techs hopefully won't be a fly by software jockey. Yes the flow rate at each chiller needs to be known AND the changes of flow rates thru the...

Well that shoots down the theory of Victaulic couplings won't hold up. I saw condensor piping jumping like that due to the tower sump continually vortexing air into the missing suction baffle hood....

Before i retired from the blue oval i took care of several sites with air cooled micro channel coils. I had a total of 29 units with all of them contaminated by different types of debris and media....

I retired from the blue oval last November. I miss my customers and my co workers. Looking at this picture i can say i don't miss setting up gantry(s) and emptying the entire van. It was fun and...

Pretty sure Jayguy is correct. A VCP type power element on the TXV would throttle suction to a maximum pressure setpoint. In the "hotbox" or "hotloop" scenario you have to have it. After the suction...

There are several Carrier products that use the low voltage control circuitry routed thru the MBB to energize what is called a "C" relay. For example CA1,CA2, CA3............ This relay performs...

The use of NST V will allow you to verify connection and comm validity to each chiller via the CCN bus connection. Then you would verify the translator cards set up, addresses and the cards...

Another issue you may end up with is leaking o"rings on the 06N compressors. After several years the o'rings become brittle within the casings assemblies. Usually you will find an oil stain between...

If you do have the PSIO (black module) vintage machine, you should consider a controls upgrade. The PSIO modules are no longer supported or manufactured by the electronics supplier. The machine can...

Proto is available from Grainger, never had any problem with them. As far as tool boxes. If any of you remember the Kennedy tool boxes years ago, that tool box is Homak today from Northern Tools,...

Typically there are three ways to curtail a chiller. Ramp loading, temperature reset, and demand limit. I am of the belief that all chillers should start the day in ramp loading, simply to slow down...

I should have mentioned that i was speaking in terms of this being a condenser pressure control operation. It was an assumption on my part that this was a condenser pressure control application as...

Typically the CV flow characteristics of a full pipe size butterfly valve are too much flow. By going down one size the modulation swings are not as drastic, resulting in less hunting by the controls...

You should refer to the Carrier piping and systems design literature. Also the Daikin or Trane piping systems design literature for further thought on the inverted loop requirements. Typically on the...

Check voltage to the ICVC panel. If it is 27 volts or higher, then machine voltage is running a little high. For the time being leave the ICVC panel lid cracked open to relieve ICVC board heat in the...

The use of sodium hydroxide coil cleaners is hardly ever done correctly. If done correctly the coil is cleaned and does not damage the aluminum to copper bond. My experience is that the cleaner is...

Verification of temperature sensors and pressure transducers, first. That cooler approach looks a little wide also, usually we see one degree or even less. If your going to clean the condensor, go...

I use a 3/4 drive hex socket into the plug socket. Use a 3/4 drive pull handle, possibly even with a cheater. apply "vigorous" tension and have a helper tap on the plug with a two pound hammer. If...

I have used an Amprobe AM-45 for many years. Good quality, accurate, but only goes to 1000 volts. Reasonably priced. Has some features for documenting trends or just to store into a file.

I remember those compressors being a royal pain to remove/repair/replace. Good thing though, very few of them failed. Last one i saw was in a church basement in Montgomery,Al.

Operation of this style unit with minimum flow can cause icing in the brazed plate heat exchanger. As the plates swell they crush together which in turn creates paths of no flow thru that portion of...

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