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Have you ran a diode check. Unplug the ct's from the board, put your meter on diode check, should be 1.5 volts or close between the pens for each ct. If not replace the module.

circuit reset is in the p1 menu

Some of you don't need to be working in this field from what I can tell

You can use a Trane TOL101 to check out a w7900. Comes with all connections and instructions for checking it out

I didn't know there was a York that wasn't loud.

Originally Posted by jt8350
forgot to mention that fan cycling controls. was the suggestion of a trane tech from the local trane office.

He wouldn't be a tech at my office making suggestions...

People do this stupid crap because they don't know what they are doing and how the machine works. Learn now the machine operates and then figure out what the real problem is. Don't just put...

One of the first things I would do is drop the chilled water temp. 52 isn't going to dehumidify much of anything.

Find the correct service lit. and run a diode test

Differential pressure switch should trip at 50 psid

Actually Trane does have a water cooled scroll unit. CGW* My question is, if you are having so much trouble with load swing on the chiller why not put in a storage tank and have it pump to the...

Check sat evap and suction temp sensors to make sure they are correct. You also need to check them to ground. If there is any reading to ground they should be changed. A grounded sensor can look to...

It is usually one of three things. Air, condenser water to hot or fouled tubes. Condenser approach should be no more then 3 degrees at full load. Have you checked to see if your purge is actually...

Sounds like it is rotating backwards for just a little until the check valve closes. The thud you are hearing sounds like the check valve closing.