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in the future - u will be able to do some more stuff here,,,!! like pat catgirl- i mean um yeah... for now u can only see others's posts :c
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14 - 0
A Turbocor uses the same base components and theory as any drive package. The base design and theory for VFD packages in chiller systems are the same. The components may look slightly different but their fundamentals are the same.
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33 - 0
For a long time I struggled to see the benefit of push/pull charging or recovery. I was very devoted to direct recovery as my set method. I have shifted my position on this to situational, but have found that when possible push/pull is faster. 1. push/pull is recirculating the vapor refrigerant to move large volumes of liquid refrigerant. The liquid is the difficult part to move quickly. 2. Direct recovery is the traditional method we learn in trade school where our recovery machine pumps directly into the cylinder for recovery and the equipment when charging.
Both have their place. chilleracademy.com/p/intro-to-chillers
Which do you use the most?
5 - 4
I'm not sure one is really better but here are two types of slide valves on screw compressors. 1. The slide is pushed either direction by pressurizing either side of the piston (puck). 2. There is a spring to push the slide to unload, then pressurize the other side of the piston to push against the spring.
I feel both are effective but I think I've had more failures with spring style. chilleracademy.com/p/intro-to-chillers
Which has given you more trouble?
5 - 0
Are you unsure how to start a troubleshoot on centrifugal chillers? If you missed the live chiller training where I walk through my process you can get the recording at hvactime.shop/products/centrifugal-troubleshooting…
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18 - 0
Turbocor compressors are great magnetic bearing centrifugal compressors for chiller techs to learn on. They have a simple layout that is very compact. The picture is of the suction bell where the IGV assembly is mounted. The motor leads have a pass through port for an external plug. The motor drives the wormgear to adjust the IGV position via the brown slide mechanism. This is a field serviceable repair if your motor or vanes fail.
Get support and be a better chiller tech today at chilleracademy.com/p/intro-to-chillers
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60 - 2
Getting my head around PID logic took some doing but having an understanding of it has helped my troubleshooting and system tuning. P (proportional) is how much the output will be adjusted at a time. The IGV adjusting 1% vs 5% at a time. I (integral) is the reaction time. The IGV getting adjusted every 1 second vs 5 seconds. D (derivative) is an adjustment factoring reaction to setpoint. From my understanding, if the chiller is quickly reaching setpoint then the derivative will slow down the allowed adjustment to the IGV. It is adjusting the P&I without actually changing their root values.
The derivative is definitely the most challenging for me to understand/explain but I think I've got a handle on it. PID logic is used in all kinds of ways. There are multiple PID loops working together in a lot of applications. chilleracademy.com/p/intro-to-chillers
Which of these confuses you the most?
4 - 1
When I'm having flow issues on my chiller's evaporator, I have a few steps on trying to verify gpm. 1. I will reference the engineering manual for the equipment. The evaporator code in the model number can help indicate to me the baseline flow expected. 2. If the engineering manual wasn't useful then I will use a rule of thumb as a starting point. 3. I will load the chiller as much as I can, then use operating conditions to get the flow in the ball park.
These steps are assuming iso valves & flow setters have been checked. I'm also assuming I already verified strainers and pumps. chilleracademy.com/p/intro-to-chillers
Which step would you start with?
2 - 2
It is hard to grasp the concepts of VFD technology and how its implemented in chiller systems. If you missed the live chiller training where I simplify these things you can get the recording at hvactime.shop/products/chiller-vfd-ops
Improve your chiller skills further at chilleracademy.com/p/intro-to-chillers
18 - 0
I consider my water cooled chillers having high condenser approach above 3F. There are exceptions to everything but most water cooled can operate at less than 3F of approach. If I have more than this I want to verify, 1. What is my condenser water DP? Is it too high? 2. If this is a low pressure chiller, what does my purge unit operation look like? Do I show signs of noncondensable? 3. What is my tube condition? Has maintenance been performed recently? Has there been work done to condenser water system somewhere? Is there evidence of excessive oil in the system?
These first steps will get me in the right direction. chilleracademy.com/p/intro-to-chillers
14 - 0
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