INSTALLATION : INSULATING YOUR GARN®
• Tape all joints of any paper faced fiberglass insulation. • When finished enclose the sides, front and rear with sheetrock or metal per code. The top insulation does not have to be covered with sheetrock.
ENCLOSURE CONSTRUCTION METHOD
Construct the insulation enclosure around the GARN® WHS unit using 2.5 ” x 1 5/8” x 18 gauge galvanized steel studs and 5/8” sheetrock. Tape all joints after the sheetrock is securely fastened into final position.
1) Place a layer of tarpaper between the concrete floor and the bottom steel stud plate to minimize possible corrosion of the bottom plate. Use power driven fasteners to attach the plate to the floor. 2) At the front of the unit, cut the sheetrock around the air collar, draft inducer housing and electric element box. Slip the sheetrock behind the steel flange that surrounds the air collar. Fasten the sheetrock to the flange using short lengths of steel studs behind the sheetrock (essentially forming a sandwich that will draw the sheetrock to the flange). Maintain a minimum 3/4” clear dimension between the edge of the sheetrock and the barrel of the air collar and ½” clear around the draft inducer housing. Install galvanized steel stud framing to safely support the sheetrock face. Tuck ONLY UNFACED rock wool or non-binder fiberglass insulation between the sheetrock face and the front of the GARN® WHS unit. 3) Provide access to the two lower cleanout covers for flue cleaning will be required on a routine basis. Construct a box from non-perforated metal studs large enough to accommodate the cleanouts, extending from the tank face to the rear surface of the sheetrock face. Install as part of the framing; however, do not cover with sheetrock and do not insulate. 4) If the unit is positioned against a concrete or block wall (with the block wall forming one portion of the insulation enclosure), install a 6 mil poly vapor barrier against the concrete or block wall before installing any insulation. The poly will prevent the insulation from absorbing water from the concrete or block wall. 5) DO NOT INSTALL any electrical wiring, fixtures, switches, etc within the enclosure, as such wiring may overheat creating a fire hazard. Rather, install all electrical wiring in light gauge metal conduit run on the exposed exterior surface of the enclosure. 6) Completely surround the unit with insulation using only the following types of non-combustible insulation: • Vermiculite or perlite • Dense pack blown in non-binder fiberglass or rock wool • Unfaced glass fiber batts • Unfaced rock wool batts
Vermiculite and perlite insulation will naturally “flow” beneath the unit. If blown-in or batt insulation is used, be sure to slide un-faced batt insulation beneath the GARN® unit as far as possible.
DO NOT USE FOAM BOARD OR FOAM BEADS TO INSULATE THE TANK ITSELF. Both will melt and are a fire hazard. Insulating under the metal skids at the bottom of the tank with
foam board is acceptable (see “Unit Placement”).
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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