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 for proper chemical 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 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.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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