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Stretch79
24-08-2017, 10:33 AM
1495214953

Morning all.

Has anyone had any dealings with these chillers?

I'm getting an anti freeze alarm and it's a bit frustrating. Individually each circuit runs perfect however when both circuits run the anti freeze alarm pops up and stops the chiller.

Looking at the diagram could it be possibly a low suction temp into the compressors? or perhaps a faulty sensor on the Evap?

Help greatly appreciated

Pop Alexandra
24-08-2017, 11:10 AM
I say it's a sensor problem. Sensors are usually poor quality in these models.

Stretch79
24-08-2017, 11:33 AM
Was thinking along the same lines. Am you going to check the ohms of each one see what comes up. There's 2 for the heating water and 3 on the chilled side.

You delt with these ones before?

Thanks

Stretch79
24-08-2017, 12:37 PM
One anti freeze sensor was 9.31 ohms and other was 8.78ohms so little bit of difference in resistance

Stretch79
24-08-2017, 03:26 PM
Changed all sensors over from a working chilled and placed in one with faults. Still happening even though the sensors should be fine.

redroge
24-08-2017, 05:06 PM
sounds like low flow rate,what are the inlet and outlet temps whats anti freeze setting whats temp setpoint

Stretch79
25-08-2017, 02:47 PM
Hi Red.

I changed set point to 14 with a differential of 2C to see if it may of been that issue but still continues.
The water temps were 17.7 in and 14.6 out but this was before it stopped.
I'd need to look at anti freeze settings on the controller as I'm not there now.

redroge
25-08-2017, 05:07 PM
also check if there is an anti freeze stat fitted as well as the sensors for the controller

Stretch79
25-08-2017, 07:40 PM
Thanks Red. There is apparently an anti freeze setting in the controller. Been told not to go as low at 3 degree. Also like you said it could be a lack of flow to the machine. Have to check strainers and if the pump is an inverter one or not

malik55
25-08-2017, 11:15 PM
Compare Ref. suction pressure of both circuits, Low on charge of one circuit may also possible to activate the Anti freeze.
Also you are right a low water flow could be the cause, note down the water gauge pressures before and after to do any action.

Stretch79
07-09-2017, 03:56 PM
Thanks Malik55 it seems to be getting worse now. Bloody machines