Welcome to Plbg.com
Thank you to all the plumbing professionals who offer their advice and expertise

Over 698,000 strictly plumbing related posts

Plumbing education, information, advice, help and suggestions are provided by some of the most experienced plumbers who wish to "give back" to society. Since 1996 we have been the best online (strictly) PLUMBING advice site. If you have questions about plumbing, toilets, sinks, faucets, drains, sewers, water filters, venting, water heating, showers, pumps, and other strictly PLUMBING related issues then you've come to the right place. Please refrain from asking or discussing legal questions, or pricing, or where to purchase products, or any business issues, or for contractor referrals, or any other questions or issues not specifically related to plumbing. Keep all posts positive and absolutely no advertising. Our site is completely free, without ads or pop-ups and we don't tract you. We absolutely do not sell your personal information. We are made possible by:  

Post New
Log In
How to Show Images
Newest Subjects
 UniMac Washers Model#UWT085V4
Author: Water Flow (CA)

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.

Post Reply

 Re: UniMac Washers Model#UWT085V4
Author: packy (MA)

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.

Post Reply

 Re: UniMac Washers Model#UWT085V4
Author: bernabeu (SC)



page 28 and after is VERY VERY VERY interesting


"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Post Reply

 Re: UniMac Washers Model#UWT085V4
Author: Curly (CA)

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.

Post Reply

 Re: UniMac Washers Model#UWT085V4
Author: bernabeu (SC)


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.


"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Post Reply

Please note:
  • Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
  • Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.
  • Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.
  • Plbg.com is also not a place to ask radiant heating (try HeatingHelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Search for plumbing parts on our sponsor's site:

Special thanks to our sponsor:

Copyright© 2024 Plbg.com. All Rights Reserved.