Rheem RRNL, Installation Instructions Manual

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2. Provide a slab sufficiently high enough above grade to prevent surface water from
entering the unit. Where snowfall is anticipated, mount the unit above the anticipat-
ed maximum snow depth for your area. Do not locate unit in an area where exces-
sive snow drifting may block combustion air inlet.
3. Pitch the slab approximately 1 ⁄
2
” so that the unit will be pitched toward the drain. See
Figure 6.
4. The location of the unit should be such as to provide proper access for inspection
and servicing as shown in Figure 12.
5. Locate unit where operating sounds will not disturb owner or neighbors. The slab
should be isolated from the foundation wall.
6. Locate unit so roof runoff water does not pour directly on the unit. Provide gutter or
other shielding at roof level.
C. ATTACHING EXHAUST AND COMBUSTION AIR INLET HOODS
IMPORTANT: Do not operate this unit without the exhaust and combustion air inlet
hood properly installed. These hoods are shipped in a carton in the return air compart-
ment inside the unit and must be attached when the unit is installed. See Figure 7.
To attach exhaust and combustion air inlet hood:
1. Remove 3 screws securing filter access panel and remove filter access panel. For loca-
tion of filter access panel, see Figure 4.
2. Remove both exhaust and combustion air inlet hoods from their carton, located inside
the return air compartment.
3. Attach filter access panel.
4. Attach the combustion air inlet hood and the exhaust hood each with 4 screws as shown
in Figure 7. Screws are in parts bag shipped in the burner compartment.
5. Vent the unit using the flue exhaust hood, as supplied from the factory, without alteration
or addition. The only exception is with factory approved additions. Consult your local util-
ity or other authority having jurisdiction for accepted venting techniques.
FIGURE 5
OUTSIDE SLAB INSTALLATION. CLOSET DISTRIBUTION SYSTEM. SLAB FLOOR
CONSTRUCTION