INSTALLATION : UNIT PLACEMENT
SETTING THE UNIT
Once the location is determined, set the unit’s skids on 2” blue, pink or yellow EPS foam insulation for the WHS 2000 unit. Use 2” polyisocyanurate foil-faced Thermax® or equivalent foam insulation (do NOT use EPS foam insulation) for the WHS 1000 unit. In either case the foam must have a minimum allowable compression strength of 25 psi. The foam should be cut to the width of the skids plus a minimum of 2”. Raise each side of the tank off the ground and slide the foam under the skids. The concrete slab that supports the GARN® unit must be relatively flat. The entire flat surface may slope slightly, but skids under the unit must be fully supported over their entire area.
DO NOT USE WHITE BEADBOARD for either WHS model. It will melt and crush causing physical damage to the flue, combustion air inlet and piping system.
HOT WATER RETURN ASSEMBLY (HWRA) for units shipped after July 2018
The HWRA consists of a 24 ” long Sch 40 bare wall black steel dispersion tube factory coupled to a double tapped bushing. This specific item varies in diameter for the 1000 and 2000 models. It is not available for the WHS 3200 model. It is supplied as a separate component and must be field installed during initial set up . The HWRA is supplied as a unit, do NOT disassemble. Picture below:
In the past, the hot water supply (HWS) to the pump was always withdrawn from the upper flange on the rear head; and the water returning from the heating system was reinjected through the lower diameter welded dispersion tube on the rear head. This arrangement yielded a slightly higher HWS temperature. However, supplying the pump from the lower fitting and returning water through the upper fitting effectively increases the useable thermal storage capacity.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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