PIPING INSTALLATION AND HOOKUP GUIDELINES
DO NOT install polybutylene or PVC plastic pipe. Provide pipe support according to plumbing code guidelines. After installation, flush all piping to remove, threading oil, solder flux, and debris. All check valves and ball valves shall match pipe size. Ball valves shall be full port, if possible. DO NOT install piping to produce a bull-head tee condition.
Install accessible shut-off valves on the supply and return pipes near the GARN® WHS unit. Install a separate boiler drain at the designated fitting on the front head of the GARN® WHS unit. DO NOT Install automatic air bleeds in a GARN® or any non-pressurized system. Install only manual air bleeds at all system high points. In new installations, provide a floor drain (with a hose bib if desired) to accommodate the overflow pipe and drain valve. Install a domestic water sill cock for adding water near the GARN® WHS unit. A filter housing and filter should be mounted in series with, and adjacent to, the sill cock. Use a hose to fill the unit through the manway opening. DO NOT permanently connect the GARN® unit to a domestic water source. Install drain valves in the distribution system where appropriate and required to allow future maintenance and equipment repair/replacement. Insulate all above grade piping with ½” wall polyolefin pipe or 1” fiberglass insulation rated to 212°F (Thermocel, Imcolock, Imcoshield are preferred brands). PLUMBING WITH COPPER: When installing copper distribution pipe use ONLY: long sweep elbows; 95-5 solder or brazing; and die-electric couplings where copper pipe joins steel pipe. DO NOT CONNECT copper pipe directly to the GARN® unit; electrolytic corrosion will occur. Install 4’ to 6’ of black steel pipe between the GARN® unit and any copper pipe. PLUMBING WITH STEEL: Use 2” black steel pipe between the GARN® unit hot water supply connection and the inlet to the GARN® hot water supply pump. If installing steel pipe, use ONLY black steel pipe. DO NOT USE galvanized pipe.
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Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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