Looking at installing 2 UniMac commercial clothes washers and want to comply with backflow prevention requirements with the local authority.

The washers are plumbed with a direct hot and cold water supply. The water inlets to the washers are not air gapped at the rear like others that I've seen. The UniMac washers are also not equipped with a built in antisiphon valve.

Haven't been able to get very far with the machine specs and how the detergent is mixed with water or if the water discharge point can potentially ever be submerged in water if there ever was a clogged drain. These are some of the factors that would determine the need for a backflow preventer.

The website specs for the model do not show the internal details that I need to decide on what type of backflow prevention is needed. [unimac.com].

Any input is greatly appreciated.



Edited 1 times.

i'm guessing you will need a testable RPZ backflow preventer. maybe 2 depending on how the hot and cold is piped.

probably best to talk to the local authorities to see what they will or will not accept.

HAPPY READING

[docs.alliancelaundry.com]


page 28 and after is VERY VERY VERY interesting

Generally speaking water companies want meter protection....Backflow device installed just past the meter.

Will need to be a USC approved reduced pressure backflow device.

Need to check with your water supplier/company to be sure. They should be able to answer this question without any trouble.

They also should be able to provide you with plate (spec sheet) showing how they want the device installed etc.

Quote

Generally speaking water companies want meter protection....Backflow device installed just past the meter. .....

'Want' is improper.

'Require' as per the FEDERAL LEGISLATION is correct.


These washers will require the services of a LICENSED BONDED INSURED plumber as well as an engineer or architect.

As I assume the OP is well aware.