19xr Low Oil Temp

[mpakluck]

got a Carrier 19xr that wont start up due to low oil temp. What energizes the oil heater contacts? The oil temp is 80 deg, the microprocessor should be calling for the oil heater. Any thoughts? (got the machine running by unplugging all plugs on the module and screen and plugging them back in.) Dont want that to be the solution, in case the problem occurs again.

[chillersinc]

sounds like a loose connection or even broken one. ohm out your wires with the power off

[mpakluck]

i had 15 volts on each side of the contactor coil, seems like something is backfeeding. seems like all the connections were tight. dont know why resetting display would make a difference but it worked

[spinning wheel]

pic 1 or 2. does it have a 6 pack relay?

[mpakluck]

sorry, not sure if 1 or 2. where is six pack relay located? not really a water cooled guru, more of an air cooled guy. whats the diff between 1 and 2?

[chillersinc]

if i remember correctly the pic 1 has smaller characters. the configuration of the display is different. the pic 2 has larger characters. there are other differnces as well, i am not sure if the xr had a pic 1 control? i do know it has a pic 2 control for sure. has anyone seen the pic 3 control?

[spinning wheel]

the first xr's had pic 1. If you do not know the difference then maybe we should reevaluate you working on this chiller. This is alot of money you are dealing with here. If you try and force the chiller to run with cold oil, you will damage the running gear of the compressor.

[mpakluck]

Don't know a lot about Carriers. Tranes are more my speed. Don't think any evaluation is needed. Not forcing machine to run with cold oil anyway. I didn't start it til temp was up to 120. I'm not some light bulb changer who shouldn't be allowed to even look at these machines. Guess I'm just not the chiller god you are^ Just throwing it out there to get some feedback

[mpakluck]

It says PIC III on the board

[Shophound]

19XR won't start unless oil temp is above minimum anyhow.

Could have had dirty connections on your oil sump temperature probe; unplugging and plugging it back in may have cleaned it enough to start working again. Could also be the sensor starting to go bad. If the latter, my condolences. I don't think that sensor sits in a well, which would require the chiller charge to be recovered or moved to one of the barrels in order to change the sensor, but I could be mistaken.