Carrier 30 Series Chiller & Pump Operation

[Gatorgogo]

I have a control strategy where I turn off a Carrier 30 Series air cooled chiller when the outside air temperature is below 55F. At the same time, I'm leaving the circulation pump running (it's a primary system). We're actually using the chilled water as a heat source (it "warms up" to about 65-70F) for the air handlers and helps "heat" the outside air makeup... so need to keep the water circulating...

Question is, does this create any problems for the chiller? (Refrigerant migration, etc?)... it doesn't seem t have any problems that I can tell.. so far..

Thanks....

[chillerguy81]

Is it a package air cooled chiller or remote condenser? Posting the full model # will help you get better responses.

[Dallas Duster]

No, you should be ok. How long have you been using this system?

[Gatorgogo]

Yes, for this application it was a packaged Carrier chiller. Don't know the exact Carrier model number.. but found out from Carrier that this is not a problem to flow water through the chiller when it is off.

This works good if you have 100% outside air units ... turn the chiller off, open the chilled water valve on the 100% OSA unit and the cold outside air cools the chilled water and warms up the leaving air of the 100% OSA units. Sometimes completely eliminates any heating require.

Obviously, the rest of the system needs to be able to handle the elevated CHW supply temp... so can only do this where it makes sense...