INSTALLATION : UNIT PLACEMENT
HWRA BENEFITS:
Both rear head fittings are the same size (2” FNPT) . The HWR assembly will screw into either flange from outside the tank, allowing you to choose from which fitting to feed the pump. If the HWRA screwed into the upper flange and the pump is supplied from the lower flange you will experience the following benefits. • Pump suction boiling is minimized or eliminated. Refer to page 17 of the Design Manual. • Piping to the pump is simplified thus reducing cost. • Increased useable thermal storage, especially with low flow such as radiant floor and all panel systems. • The pump will easily self-prime itself.
In either case, three very important restraints must be obeyed:
• Always supply your pump with water from the non HWRA flange using 2” pipe and minimal 45 or 90 degree elbows. • Always return water through the HWR assembly , installed in the flange not supplying the pump. • All other standard hydronic piping practices should be observed, ie: pipe sizing, shut off valves, isolation valves, die-electric unions, drains, etc. Refer to the Design Manual for additional piping information.
INSTALLATION
The HWRA is supplied as a unit, do NOT disassemble:
• For model WHS 2000 - 1.5” x 24” Sch 40 pipe threaded into a 2” x 1.5” double tapped steel bushing. • For model WHS 1000 - 1” x 24” Sch 40 pipe threaded into a 2” x 1.5” double tapped steel bushing
The HWRA assembly is inserted into one of the two 2” flange fittings located on the rear head of the GARN WHS unit so that the pipe extends into the tank . Apply Teflon® pipe dope to the 2” NPT male threads of the steel bushing before screwing it into the 2” flange. Tighten securely.
The exposed portion of the bushing includes a 1” or 1.5” NPT female thread. Thread the hot water return pipe from your heating system into the female thread of the bushing. Apply Teflon® pipe dope and tighten securely.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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