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@@HVACTIME Dear hvac expert from long time i am watching your following to you.I am from pakistan.i am facing one problem in my yciv chiller.this chiller have to to systems.chiller was running normal but i recive complaints chiller trip both system same time trip due to low suction alarms.We changes steppers controller and new mother board.water flow also also ok in cooler suction tranduser also replaced.Share your advice.thanks for repling.

I've always used skid plates and rigging equipment with a gantry

Trane offers classes through Trane University.

I have the software license. I don't work for Trane though.

You don’t need proprietary software for Trane nor a license

Noticed that you repeated it at 3:42 and 3:51 but at the start you said the unloader was energized. Seems like you mixed up the words?

Was reading through the RTAA IOM to study this further and noticed it says. “The female unloader valve is the first stage of loading after the compressor starts and the last stage of unloading before the compressor shuts down.” Appreciate your videos, I don’t know about any other channels that make quality large tonnage HVAC videos like yours. I mostly work on under 100 tons so I’ll dabble with this equipment occasionally. It’s good to be able to see the equipment to supplement the studying I’m doing in manuals and other resources.

Looks like I found the other answer in the manual. Kind of odd that energizing the unloader valves loads the compressor and vice versa. You would think it should be called a female loader valve. “The female unloader valve solenoid receives a constant signal from the UCM, based on system cooling requirements. To load the compressor, the female unloader valve solenoid is energized and discharge pressure is passed through the normally-closed port and into the cylinder. This pushes the female unloader valve closed. To unload the compressor, the female unloader valve solenoid is de-energized and the discharge pressure is relieved to the suction of the compressor. The female unloader valve retracts into the cylinder and the compressor is unloaded.”

Yes the female unloader gets denergize as a final step before shutdown. So when loading starts it gets energized and stays energized until shutdown.

In my job location i have facing on problem with chiller of yciv 2 system model.chiller was in normal operations but now a day's chiller going low suction trip same time both system going low suction trip.i changed stepper controller and motherboard also with new one but same issue.after start both systems of chiller goes low suction trip.need help to rectify

Thats weird, there should be a current version