Trane rtaa

[ewilcox]

Getting oil fault, where oil temp is cooler than condenser temp greater than setpoint.
checked oil, condenser thermisters, cleaned condenser coils. dont believe its an oil filter problem as the code is not for oil pressure. believe may be low on oil, does anyone have any other ideas

thanks

[ewilcox]

Sorry the diagnostic for this post is oil system fault ( entering oil temp on either compressor of given circuit reads a temp x degrees below the given circuits saturated condenser temp for more than 30 minutes

[HVACRsaurus]

Hi there,

I've mostly worked on the water cooled style but something I could suggest..

Pretty sure the oil cooler circuit is a small section of the air cooled condenser, the alarm points to the oil being to cold. Recommend trial operation of the unit with the fans one the oil cooler side turned off. Watch the saturated condening temperature vs oil temperature and switch the fans on as needed, oil temperature approx 5 to 10degC above saturated condensing temperature is probably fine.

Just incase,

http://www.trane.com/Commercial/Uploads/Pdf/1060/RTAA-SVX01A-EN_09012005.pdf

[HVACRsaurus]

Alternatively, block off (with cardboard/plastic sheeting/whatever) the section of the condenser which is the oil cooler to raise the oil temperature above saturated condensing temp.

[CV_Geardrive]

Hi ewilcox,
The only A/C European unit with these compressors is the RTAB unit.
In the first generation of this unit we had to block a big section of oil cooler in order to make the unit operate.
The only RTAA with these compressors (GP1 – CHHN) is the RTAA 70-125 made in US.
With these units we never had such problems.
I suggest you to download document of above link and check oil level in oil separator, oil pressure drop in oil filter and circuit subcool.
Most probably you have to replace the filter.
The oil temperature should not be less than 8°C bellow saturated condenser temperature for 30 minutes when female loader is energized.
Check if the compressor run unloaded because of no loads or because female loader coil is burned out!!
A small tip. In the first generation of these US units when we were programming it we were set the oil differential cut out temperature to -8°C. (Means 8°C bellow sat cond temp)
Because of a software bug, the controller was reading this -8°C not as differential temperature but as absolute temperature resulting a 17,6°F setting and not 14,4°F as it should.
When you check this parameter please turn the controller to ENGLISH units.
Regards,
CV

[goshen]

HI sounds to me like good advice!!!
good luck