Carrier 30RA Thermistor

[matija456]

Carrier model: 30RA-060-B0204-PEE--
Serial number: 12Z419188

I need the part number on T2 thermistor (entering fluid sensor) for the inlet water temperature sensing. Top one on the heat exchanger.
It's giving some weird temperature readings. Leaving fluid thermistor (T1) shows 17C°, and this one shows 30C°, then 45C°, then 67C° and so on. After few ours unit gets shut down, and shows alarm code 36 which is water heat exchanger frost protection, because it cools the glycol to low.
Please if somebody can get me this part number for thermistor, I would be grateful.

[Dallas Duster]

Is the part number not on the sensor near the silver end ? Starts with HN. Not sure if European and USA sensors have the same part number.

[matija456]

We didn't took it off so I don't have it by myself, because chiller must work, but it's urgent to fix it.

[Dallas Duster]

We didn't took it off so I don't have it by myself, because chiller must work, but it's urgent to fix it.

So it's the LWT sensor if yes swap your EWT and LWT in their perspective wells the turn the red connector on the board 180 degrees .

Also confirm water flow and a clean strainer.

[R123]

He said it's the entering water temp sensor so he wouldn't want to swap them.

[Dallas Duster]

He said it's the entering water temp sensor so he wouldn't want to swap them.

Not sure if there is a language problem here but I find it hard to believe that a the ewt sensor is causing the chiller to over cool I think he is mistaken. I know the US chillers use LWT control so you can have 17 C water and 35c return it won't matter.

[matija456]

There was problem with water flow. Pressure was showing 0 bar, so we pumped glycol. Now it's showing 0.75 bar on chiller itself, and 2.5 bar in basement (15 meters below or 49 feet). We would like to change the T2 thermistor because it's showing some crazy readings. I don't know if chiller can operate normally with defective thermistor so we will change it. Chiller is now working good. No alarms or anything.

[Dallas Duster]

There was problem with water flow. Pressure was showing 0 bar, so we pumped glycol. Now it's showing 0.75 bar on chiller itself, and 2.5 bar in basement (15 meters below or 49 feet). We would like to change the T2 thermistor because it's showing some crazy readings. I don't know if chiller can operate normally with defective thermistor so we will change it. Chiller is now working good. No alarms or anything.

Your chiller should be using leaving water temp for control as long as the entering water sensor doesn't go out of range you will be ok.

[Gibbo]

As this is quite a small chiller i suspect its controlling on return water and not leaving water as with the larger models.
Part number will be on the cable of the sensor

[Dallas Duster]

As this is quite a small chiller i suspect its controlling on return water and not leaving water as with the larger models.
Part number will be on the cable of the sensor

Hey there Gibbo does this chiller have Pro Dialogue on it?

[Gibbo]

HI There Cowboy Hope your well and life is good

Yes its a pro dialog

[matija456]

Pro dialog plus