York YK

[Ken CT]

I think the model number is YKCECGQ 75. (Handwriting problem!)

When I arrived at my client's premises, the machine in question was running and there was no indication of a problem. I looked at the history but that was not much help. Here are a few of the recorded events....

08:59:57 Oil - Low oil temperature differential
08:57:28 Control Panel - Power failure
08:53:24 Oil - Low oil temperature differential
08:52:29 Control Panel - Power failure
08:51:26 Oil - Low oil temperature differential
08:50:32 Control Panel - Power Failure

The other events were the same with only minor differences in time.

Note the short time intervals between faults. Note also that the original fault had long since disappeared off the screen. I'm presuming that may be because the fault is an auto restart fault. A total guess!

When I looked at the details of each of these failures, the readings weren't helpful either. They simply indicated that the machine had been off for a considerable time. The chiller water temperatures were, for example, in the region of 17 to 18 degrees. (Errr.. umm... I know that most of you work in F and PSI but I'll not go into that for this exercise. Suffice to say +/- 22C = 72F.) Oil temperatures were normal for a machine that is idle and pressures as well.

I have no idea why the power failure fault is shown as there is not generally a problem with the power supply and I was unable to identify one today. It is, of course, possible that the power fault was genuine and that this caused a low oil temperature problem.

Basically, I have 2 questions. Firstly, "low temp differential" between what 2 readings? Secondly, could a possible power failure have this effect?

I'd really appreciate some intelligent input on this - your :.02: will be well spent here!

[DFZ]

power off = no oil heater

if the oil temp is within 30 deg F of condensor saturation you get the differential fault. 72 deg water and 102 deg oil = low differential

check power, needs to stay on.

Doug

[9675]

I second the above, perfectly put

[Ken CT]

That was my calculated guess but that is all it was - a guess. Had no science to back it up. Thank you both very much. Is it normal for the system to record the fault in such short time intervals?

[DFZ]

loss of power will be recorded at restoration of power, when panel starts to operate it will also log anything else that is a fault,

i lost power
oil is also too cold
etc.

it will log all faults at start, with only seconds in between.

hope this helps

[Ken CT]

Hi DFZ

Every little bit helps. :yes: Thanks!

I understand exactly what you're saying - I'm just surprised to see the same 2 faults repeated at +/- 2 minute intervals...

08:59:57 Oil - Low oil temperature differential
08:57:28 Control Panel - Power failure
08:53:24 Oil - Low oil temperature differential
08:52:29 Control Panel - Power failure
08:51:26 Oil - Low oil temperature differential
08:50:32 Control Panel - Power Failure

Seems strange.

[buckfever]

This "low oil Diff." is not a latching fault. YT's that may come on after the towers where in free-cooling will get this fault, as the tower water is too cold. This is a fault in yellow I believe so it will auto reset.As far as power failure make sure there is not a "reset mode" facility guy trying to clear the fault. I can't stand people who think the solution is cycling the power, drives me crazy!!

[Ken CT]

Hey Buck

I'm aware that this is an auto reset fault but you may well have a point there regarding the facility guy. I had not thought of that. I'm pretty sure I'm not being told everything by the client's staff and there is a wiseguy among them. Fact is I was discussing this very point with one of my colleagues just about an hour ago and we decided that it might be a good idea to try giving this guy a miss. There is another, altogether smarter guy there who is way better to deal with. I think I'll try that.

Thanks for your input.

[buckfever]

Hi Ken,
What state are you in??

[Ken CT]

Hi Ken,
What state are you in??I'm not in the States Buck - I'm in Africa. :D

[buckfever]

Ok Ken,
You sounded like a Ken I knew in Ct. Guess not!!! Let us know what you find out!!

[poppop]

your screen indicates that the customer wanted to start the unit, but was unable to because the oil temp wasn't high enough. the customer didn't know how to reset the panel so they cycled the main breaker in hopes of resetting the panel. they didn't realize this would do nothing to increase the oil temp so they tried again.
run into this sequence all the time.

[Ken CT]

(SSHHH! Not so loud! someone might hear you!) :whistle: I should have realised that but didn't until Buckfever pointed it out. The guy on site would typically do that but that went over my head as well and I really should have... Oh dear! Could have, would have, should have... My kids will have something to say about that if they ever find out!!