Subpart 1.
Section 603.2.
UPC section 603.2 is amended to read as follows:
603.2 Approval of Devices or Assemblies. Before a
device or an assembly is installed for the prevention of backflow, it shall
have first been approved. Devices or assemblies shall be tested in accordance
with recognized standards or other approved standards. Backflow prevention
devices and assemblies shall comply with Table 603.2, except for specific
applications and provisions as stated in Sections 603.5.1 through 603.5.23.
Devices or assemblies installed in a potable water supply
system for protection against backflow shall be maintained in good working
condition by the person or persons having control of such devices or
assemblies. The devices or assemblies shall be tested at the time of
installation, repair, or relocation and not less than on an annual schedule
thereafter, or more often where required by the Authority Having Jurisdiction.
Where found to be defective or inoperative, the device or assembly shall be
repaired or replaced. No device or assembly shall be removed from use or
relocated, or other device or assembly substituted, without the approval of the
Authority Having Jurisdiction.
Testing shall be performed by a certified backflow assembly
tester in accordance with ASSE Series 5000.
UPC Table 603.2 is not amended.
Subp. 2.
Section 603.5.4.
UPC section 603.5.4 is amended to read as follows:
603.5.4
Heat Exchangers. Heat
exchangers used for heat transfer, heat recovery, or solar heating shall
protect the potable water system from being contaminated by the heat-transfer
medium.
603.5.4.1
Single-Wall Heat
Exchanger. Installation of a single-wall heat exchanger shall meet all
of the following requirements:
(1) Connected
to:
(a) a low-pressure hot water boiler
limited to a maximum of 30 pounds-force per square inch gauge (psig) (207 kPa)
by an approved safety or relief valve; or
(b) a steam system limited to a maximum of 15
psig (103 kPa).
(2) The
heat-transfer medium is either potable water or contains fluids having a
toxicity rating or Class of 1.
(3)
Bear a label with the word "Caution," followed by the following statements:
(a) The heat-transfer medium shall be water
or other nontoxic fluid having a toxicity rating or Class of 1 as listed in
Clinical Toxicology of Commercial Products, 5th edition.
(b) The pressure of the heat-transfer medium
shall be limited to a maximum of 30 psig (207 kPa) by an approved safety or
relief valve.
The word "Caution" and the statements in letters shall have an
uppercase height of not less than 0.120 inch (3.048 mm). The vertical spacing
between lines of type shall be not less than 0.046 inch (1.168 mm). Lowercase
letters shall be compatible with the uppercase letter size
specifications.
603.5.4.2
Double-Wall Heat Exchanger.
Double-wall heat exchangers shall separate the potable water from the
heat-transfer medium by providing a space between the two walls that are vented
to the atmosphere.
Subp.
3.
Section 6603.5.12.
UPC section 603.5.12 is amended to read as follows:
603.5.12 Beverage Dispensers. Potable water supply
to beverage dispensers, carbonated beverage dispensers, or coffee machines
shall be protected by an air gap or a vented backflow preventer in accordance
with ASSE 1022. For carbonated beverage dispensers, piping materials installed
downstream of the backflow preventer shall not be made of copper and not be
affected by carbon dioxide gas.
Subp.
4.
Section 603.5.18.
UPC section 603.5.18 is amended to read as follows:
603.5.18 Potable Water Outlets and Valves.
Potable water outlets, freeze-proof yard hydrants, combination stop-and-waste
valves, or other fixtures that incorporate a stop-and-waste feature that drains
into the ground shall not be installed underground except for a freeze-proof
yard hydrant that is located at least two feet above the water table and at
least ten feet from any sewer or similar source of contamination.
Subp. 5.
Section
603.5.
UPC section 603.5 is amended by adding the following
subsections:
603.5.22
Barometric Loop. A barometric loop is an acceptable method of protection
of water connections where an. actual or potential backsiphonage hazard exists
that is not subject to backpressure.
603.5.23
Installation of Testable
Backflow Prevention Assembly. Testable backflow prevention assemblies
meeting ASSE Standard 1013, 1015, 1020, 1047, 1048, or 1056 shall be installed,
tested, maintained, and removed in accordance with sections 603.5.23.1 through
603.5.23.4.
603.5.23.1
Notification of
Installation. The administrative authority shall be notified before
installation of a testable backflow prevention assembly. The public water
supplier shall be notified of the installed testable backflow preventer
assembly within 30 days following installation on a community public water
system.
603.5.23.2
Testing
and Maintenance. The installation of a testable backflow prevention
assembly is permitted only when a periodic testing and inspection program
conducted by qualified personnel is provided by an agency acceptable to the
administrative authority. Inspection intervals shall not exceed one year. The
administrative authority may require more frequent testing if deemed necessary
to ensure protection of the potable water. A testable backflow prevention
assembly shall be inspected after initial installation to ensure that it has
been properly installed and that debris resulting from the piping installation
has not interfered with the functioning of the assembly.
603.5.23.3
Inspection and
Records. A test and inspection tag shall be affixed to the testable
backflow prevention assembly. The tester shall date and sign the tag and
include the testers backflow prevention tester certification number-Written
records of testing and maintenance shall be maintained and submitted to the
administrative authority, and to the public water supplier, within 30 days of
testing if installed on a community public water system.
603.5.23.4
Notification of
Removal. The Authority Having Jurisdiction, in addition to the public
water supplier, shall be notified within 30 days following removal of a
testable backflow prevention assembly from a community public water
system.