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. 4715.5500 REGENERATION SANITATION E. vertical piping shall be secured at su�ciently close inter- PROCEDURES. vals to keep the pipe in alignment and carry the weight of the pipe; and All new or used water conditioning equipment shall be disinfected F. horizontal piping shall be supported at sufficiently close before being installed. All portable exchange water conditioning �ntervals to keep it in alignment and prevent sagging. equipment shall be disinfected during every regeneration. Disin- fection shall be achieved by the application of chlorine or a chlo- STAT AUTH: MS s 326.60 rine compound such as sodium or calcium hypochlorite,durina the fresh water rinse, to provide an eftluent minimum chlorine 4715.5800 LICENSING. residual and time combination as given in the following table: Minimum Time Minimum Chlorine Subpart l. Examination. A written examination for the licens- Minutes Residual--parts per million ing of water conditioning equipment contractors and installers shall be given at least once per year. The licensing examination 4 20 for contractors and installers shalt include questions covering one 5 15 or more of the following subject areas: relevant piumbing and 10 7.5 installation provisions, materials and tools of the trade, general 15 5.0 principles of water conditioning processes,and operation of wa- 20 4.0 ter conditioning equipment. In addition to the above, the contractor's licensing examination shall include questions cover- STAT AUTH: MS s 326.60 ing one or more of the following subjects: calculations to deter- mine appropriate equipment size,and specific functions and pro- 4715.5600 VARIANCE. cesses involved in different types of water conditioning. If an installation cannot be made in conformance with the Minne- Subp.2. Examination requirements for instaliers. The exami- sota Plumbing Code(parts 4715.0100 to 4715.2860)or with the nation for the installer's license shall be given only to persons provisions contained in parts 4715.SOOO to 4715.6000,the water v`'ho have had at least six months'experience in the field of water conditioning contractor or installer shall consult with the appro- conditioning installation and servicin�. priate plumbing inspector, and obtain a variance from the scate Subp.3. Contractor's ticense requirement, The examination for rules before the installation may proceed. Such a variance can be �he contractor's license shall be given only to persons who have had granted only if the nonconforming alternative will not create a at least 12 months'experience in planning and supervising the in- risk to health. The commissioner shall grant variances to parts stallation and servicing of water conditioning equipment. 4715.5000 to 4715.6000 only according to the procedures and criteria specified in parts 4717.7000 to 4717.7050. Subp.4. Application. A person applying to take an examination STAT AUTH:MS s 14.05; 326.60 shall complete an application supptied by the Minnesota Depazt- HIST: 15 SR 1597 ment of Health and return the completed application along with the appropriate examination fee. 4715.5700 EQUIPMENT AND MATERIALS Subp.5. Results of the examination and license. A grade of 70 USED IN INSTALLATIONS. percent shall be considered a passing grade. The applicant shall be notified of the results of the examination. A license shall be Where applicable, the following shall conform to the Minnesota issued to an applicant who has passed the examination upon re- Plumbin� Code (parts 4715.0100 to 4715.2860): all materials ceipt of the appropriate license fee. and connections used in the installation of water conditioning and treatment equipment; all attachments to the building. STAT AUTH: MS s 326.60 In accordance with the Minnesota PlumbinL Code (parts 4715.5900 F�ES. 4715.0100 to 4715.2860): Subpart 1. Examination appiication fee. The fee for applica- A. the bypass valve assembly shall be the same size as the tion for examination or reexamination is $50 for a water condi- line in which it is installed and shall be a full-way valve unless a tionina installer,and$50 for a water conditioning contractor. The bypass valve which complies with part 4715.5200 is supplied as examination application fee is not refundable. an integral part of the water conditioning equipment; Subp.2. License fee. The fee for a new license or for renewal of B. joints and connections which are made in the course of an existin= license is as follows: water conditioning installer, installing water conditioninD and treatment equipment shall be $35; water conditioning contractor, $70, except that an applica- tested for water tightness; tion for initial licensure that is submitted during the last three C. copper tube joints shall be soldered or brazed; months of the calendar year must be accompanied by a fee of $17.50 for a water conditioning installer or$35 for a water condi- tioning contractor. D. soft copper tubing joints may be flared or soldered; �a�