Trane RTAD 180 MANUALS

[texanul]

Hello guys . I have a problem with above Trane chiller and i need some wiring documentation .
I have a Phase loss alarm on second compressor and i don`t know who is generating the alarm .
Best regards .

[moideen]

Hello guys . I have a problem with above Trane chiller and i need some wiring documentation .
I have a Phase loss alarm on second compressor and i don`t know who is generating the alarm .
Best regards .
Check the resistance of current transformer (CT) for compressor. Probably the CT will be defective.

[FreezerGeezer]

Is it a UCM/CLD controller, or a CH530?
As Moideen says, test the CT. Also (obviously) check the phases are balanced, no more than 10% from the mean value.
Be aware that controllers on some Trane chillers have insufficient inputs to assign each possible fault it's own port. As a result, some faults will be tagged as the primary fault for that input, but actually be a secondary fault.
Is there no paperwork with the chiller? Or an O&M manual on site?

[texanul]

I did a check on the current transformer and they are ok . All 6 of them have 62-64 ohm . 1154211543

[CV_Geardrive]

Hi,
If the compressor is not starting check the high pressure pressostat especially if it is a double one.
If the compressor starts and then trips, several causes exist such as:
Severe voltage unbalance,
Defective current transformers,
Defective compressor module (Try to swift modules, if you know how),
Defective contactors, etc.
Regards,
CV

[moideen]

Hi,
If the compressor is not starting check the high pressure pressostat especially if it is a double one.
If the compressor starts and then trips, several causes exist such as:
Severe voltage unbalance,
Defective current transformers,
Defective compressor module (Try to swift modules, if you know how),
Defective contactors, etc.
Regards,
CV
dear cv-gerad,

i want to know more about "swift module" which you mentioned. is this already integrated on control panel or any external device.

[FreezerGeezer]

I think he meant switch? As in, swap the two compressor control modules & see if you still have the same problem, or if the problem moves with the module.
This is a simple way to prove if it's the modules that are at fault.

It's a UCM/CLD controller. I'll have a look, maybe I still have a wiring diagram for them.

With regard to the HP switch; Yes, a lot of Trane gear has dual HP switches which can really mess with you if you're not familiar. Used to be mounted behind the forward end panels & at a glance it looks like a normal HP/LP switch. Where it's tricky is that both switches are manual reset, but there's only one reset button on top. The second reset is a small brassy looking press stud in the upper middle of the front. Take off the front cover of the switch & you'll see it.

Are there any faults showing on the display? If the system is in fault, the red LED at the top right of the display module should be flashing , iirc.

[serviceman]

check the boot confirmation signal to the compressor module.

not confirm the startup module interprets this as loss phase.
all faults are presented in the panel even the pressure switch

[texanul]

My problem just disapeared after 2 days . Stupid problem . Thanks guys . Both compressors runnig fine now .

[FreezerGeezer]

Good to hear (I think?). I've found some wiring diagrams if you want them?