INSTALLATION : PIPING YOUR GARN®
PIPING YOUR GARN ® The key to any great hydronic system is design and planning. At the same time hydronic heating is relatively forgiving and can operate under a variety of circumstances very well. For discussion on designing and planning the hydronic system that the GARN® unit is connecting to, see the GARN® System Design Manual (available at www.garn.com ). The intent of this section is not to make every customer a competent mechanical installer or plumber. That takes time and experience. Instead, the rest of this section is used to highlight some common pitfalls and mistakes made when plumbing up a GARN® and to make the installer aware of specific requirements. WARNINGS WHEN CONNECTING TO AN EXISTING SYSTEM OR GLYCOL TREATED SYSTEM DO NOT CONNECT YOUR GARN® WHS OR ETS UNIT TO AN OLD, DIRTY OR GLYCOL TREATED EXISTING HYDRONIC SYSTEM UNTIL THE EXISTING SYSTEM HAS BE THOROUGHLY CLEANED AND FLUSHED. Conventional hydronic distribution systems with a steel or castiron 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 MUST 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 Johnson Products (see next page) for proper chemicals and procedures. ANTI-FREEZE USED IN DISTRIBUTION SYSTEMS MUST BE REPLACED AFTER 3 - 5 YEARS. Anti-freeze slowly degrades over time and transforms into a very aggressive solution that readily attacks steel. Any hydronic system that utilizes antifreeze MUST be periodically checked and the antifreeze replaced before it becomes aggressive. ISOLATE THE GARN® WATER FROM ANY GLYCOL TREATED SYTEM. If the distribution system requires anti-freeze, the distribution system must be isolated from the GARN® heat storage water with a flat plate or equal heat exchanger. The GARN® unit shall never be filled with a glycol mix or other type of anti-freeze. THE DESIGN AND INSTALLATION OF YOUR DISTRIBUTION SYSTEM MAY CAUSE THE GARN ® TANK TO CORRODE , 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.
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GARN® WHS 1000 and WHS 2000 Manual | © HY-C® Company LLC | October 2024
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