103I.209 SUBMERGED CLOSED LOOP HEAT EXCHANGER SYSTEM; REQUIREMENTS.
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103I.209 SUBMERGED CLOSED LOOP HEAT EXCHANGER SYSTEM; REQUIREMENTS.
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Subdivision 1. Permit required.
After May 25, 2023, a person must not install a submerged closed loop heat exchanger in a water supply well without a permit granted by the commissioner. A submerged closed loop heat exchanger system approved by a variance granted by the commissioner prior to May 25, 2023, may continue to operate without obtaining a permit under this section or section 103I.210 .
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Subd. 2. Construction.
(a)A water supply well constructed to house a submerged closed loop heat exchanger must be constructed by a licensed well contractor and the submerged closed loop heat exchanger must be installed by a licensed well contractor.
(b)The commissioner may consider a variance under Minnesota Rules, part 4725.0410 , to the screen configuration requirements under Minnesota Rules, part 4725.2750 , to allow any combination of screen, casing, leader, riser, sump, or other piping so long as the screen configuration does not interconnect aquifers or extend through a confining layer. The commissioner must consider rules for these screen configurations during the expedited rulemaking process authorized by section 103I.208, subdivision 3 .
(c)A water supply well used for a submerged closed loop heat exchanger must comply with the requirements of this chapter and Minnesota Rules, chapter 4725.
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Subd. 3. Heat transfer fluid.
Water used as heat transfer fluid must be sourced from a potable supply. The heat transfer fluid may be amended with additives to inhibit corrosion or microbial activity. Any additive used must be ANSI/NSF-60 certified.