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SECTION 18: MAIN DRAIN (OPTIONAL)
THE MAIN DRAIN MUST BE SET IN THE BOTTOM OF THE
HOPPER AFTER THE WALLS HAVE BEEN ERECTED, BUT PRIOR TO THE SAND OR AGGREGATE BOTTOM. LOCATE THE CENTER OF THE HOPPER BOTTOM BY RUNNING TWO (2) STRINGS DIAGONALLY ACROSS THE HOPPER BOTTOM AND DIG A 24" SQUARE
HOLE 6" TO 3" DEEP. DIG AN 3" TRENCH UP THE HOPPER SLOPE AND UNDER THE WALL PANEL TOWARD THE FILTER, SEE FIGURE 28
STEP 1: ASSEMBLE THE MAIN DRAIN FITTING BY INSERTING A 11/2" MALE ADAPTER TO THE SIDE HOLE. USE CELLOPHANE TAPE AND COVER ALL THE SCREW HOLES IN THE TOP. SEE FIGURE 29. IF THE MAIN DRAIN IS BEING INSTALLED TO PROTECT THE POOL FROM SUSPECTED GROUND WATER, DO NOT INSTALL THE PIPE PLUG IN THE BOTTOM HOLE. USE A HYDROSTATIC RELIEF VALVE AND A WELL POINT. SEE FIGURE 30.
STEP 2: DIG A HOLE 18" IN DIAMETER AND 18" DEEP IN THE CENTER OF THE 24" HOLE AND START FILLING WITH CRUSHED STONE. PUT THE MAIN DRAIN WITH WELL POINT IN PLACE AND PACK GRAVEL AROUND THE WELL POINT. LEVEL THE TOP OF THE MAIN DRAIN AT THE PROPER ELEVATION. IF THE MAIN DRAIN IS BEING INSTALLED WITHOUT THE WELL POINT, SET THE UNIT IN THE HOLE AND ADJUST TO PROPER ELEVATION. STAKES MAY BE USED TO HOLD IN PLACE.
STEP 3: ATTACH A PIECE OF PIPE TO THE MALE ADAPTER USING TWO (2) S,S. HOSE CLAMPS TO SEAL THE JOINT. RUN THE PIPE UP THE TRENCH AND UNDER THE POOL WALL.
STEP 4: FILL THE TOP OF THE HOLE WITH CONCRETE. FLOAT THE CONCRETE UP TO THE TOP OF THE MAIN DRAIN BODY. SLOPE THE CONCRETE AS SHOWN IN FIGURE 30 SO LATER SETTLING CANNOT DAMAGE THE LINER. LET THE CONCRETE, SET. CAREFULLY CLEAN THE TOP OF THE MAIN DRAIN AND SMEAR A LITTLE NON-HARDENING GASKET ADHESIVE ON THE TOP SURFACE. CAREFULLY ALIGN THE HOLES AND APPLY ONE (1) OF THE MAIN DRAIN GASKETS. THE GASKET WILL BE HELD BY THE ADHESIVE DURING THE LINER INSTALLATION.
STEP 5: CONNECT THE OTHER END OF THE PIPE FROM THE MAIN DRAIN TO THE SUCTION SIDE OF THE PUMP AS SHOWN IN THE PLUMBING DIAGRAM. AFTER THE LINER IS HELD IN PLACE WITH THE VACUUM AND YOU ARE SATISFIED WITH THE FIT, PUT ABOUT TWO INCHES OF WATER IN THE LINER. USING A 20" x 30" PIECE OF PLYWOOD COVERED WITH CARPET AND FOUR (4) THIN ROPES ATTACHED TO IT, LOWER THIS INTO THE HOPPER NEXT TO THE MAIN DRAIN AS SHOWN IN FIGURE 31. BE CAREFUL NOT TO COVER ANY OF THE MAIN DRAIN OPENING.
STEP 6: DESCEND CAREFULLY DOWN THE LADDER AND STEP ONTO THE BOARD, WHICH WILL KEEP YOU FROM MAKING FOOTPRINTS. PLACE THE SECOND MAIN DRAIN GASKET ON THE LINER AND ALIGN IT WITH THE FIRST ONE BY FEELING FOR THE HOLES THROUGH THE LINER. LOCATE THE FACE PLATE ON TOP OF THE GASKET. USING A SHARP OBJECT, PIERCE A HOLE AND INSERT ONE (1) OF THE SCREWS. REPEAT THIS AROUND THE ENTIRE FACE PLATE. WHEN ALL THE SCREWS ARE IN PLACE, MAKE SURE THEY ARE VERY TIGHT. TAKE A SHARP KNIFE AND CUT OUT THE VINYL IN THE MAIN DRAIN. INSTALL THE PLASTIC GRATE OVER THE OPENING.
CLIMB UP THE LADDER AND REMOVE IT FROM THE POOL AND CAREFULLY REMOVE THE BOARD. CONTINUE FILLING THE POOL AS DESCRIBED PREVIOUSLY.
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