CONNECTING TO AN EXISTING PRESSURIZED OR GLYCOL TREATED DISTRIBUTION SYSTEM:
DO NOT connect your GARN® unit to an old, dirty or glycol treated hydronic system until the system has be thoroughly cleaned and flushed.
Conventional hydronic distribution systems with a steel or cast iron boiler, cast iron radiators, copper hot water baseboard, or water to air coils, may contain a sludge or solution that can attack the steel in your GARN® heat storage system. Over time bacteria, debris and/or glycol can transform into this very corrosive sludge/solution. This liquid SHOULD NOT BE MIXED with the GARN® storage water. Rather the existing system MUST be completely drained and flushed with a chemical cleaner before connecting it to the GARN® unit. Contact PrecisionChem for proper chemical and procedures:
Mike Kuzulka @ PrecisionChem Water Treatment W7231 State Road 49 Waupun, WI, 53963 1-(920)-324-2007 (call with any questions)
Anti-freeze used in distribution systems must be replaced after 3 - 5 years. Anti-freeze slowly degrades over a period of time and transforms into a very aggressive solution that readily attacks steel. Any hydronic system that uses antifreeze MUST be periodically checked and the antifreeze replaced before it becomes aggressive.
Isolate the GARN® water from the distribution system with a heat exchanger. If the distribution system requires anti-freeze, the distribution system MUST be
isolated from the GARN® WHS heat storage water with a flat plate or equal heat exchanger.
The design and installation of your distribution system may cause the GARN® tank to become sacrificial, if proper procedures are not followed. Connect only black
steel pipe to GARN® unit, install dielectric couplings where copper pipe connects to steel pipe, install the chemicals provided and test/maintain your water chemistry twice per year. Sacrificial anode rods further help reduce the potential for this type of corrosion.
Carefully follow all procedures specified in the GARN® WHS Owner’s Manual.
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Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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