Rheem RLKN-B073 Series, Installation Instructions Manual, Page: 12 / 28

C. CLEARANCES
The following minimum clearances must be observed for proper unit performance
and serviceability.
1. Unit is design certified for application on combustible flooring with 0" minimum
clearance.
2. See Figure 6 for illustration of minimum installation-service clearances.
D. ROOFTOP INSTALLATION
1. Before locating the unit on the roof, make sure that the strength of the roof and
beams is adequate at that point to support the weight involved. (See specifica-
tion sheet for weight of unit.) This is very important and user’s responsibility.
2. For rigging and roofcurb details, see Figures 8 and 9. Use field-furnished
spreaders.
3. For roofcurb assembly, see Roofcurb Installation Instructions.
4. If the roofcurb is not used, provisions for disposing of condensate water runoff
must be provided.
5. The unit should be placed on a solid and level roofcurb or platform of adequate
strength. See Figure 10.
6. The location of the unit on the roof should be such as to provide proper access
for inspection and servicing.
IMpORTANT: If unit will not be put into service immediately, cover supply and return
openings to prevent excessive condensation.
IX. DUCTWORK
Ductwork should be fabricated by the installing contractor in accordance with local
codes and NFPA90A. Industry manuals may be used as a guide when sizing and
designing the duct system – contact Air Conditioning Contractors of America, 1513 16th
St. N.W., Washington, D.C. 20036.
The unit should be placed as close to the space to be air conditioned as possible allow-
ing clearance dimensions as indicated. Ducts should be run as directly as possible to
supply and return outlets. Use of non-flammable waterproof flexible connectors on
both supply and return connections at the unit to reduce noise transmission is recom-
mended.
It is preferable to install the unit on the roof of the structure if the registers or diffusers
are located on the wall or in the ceiling. A slab installation could be considered when
the registers are low on a wall or in the floor.
On ductwork exposed to outside air conditions of temperature and humidity, use a min-
imum of 2" of insulation and a vapor barrier. Distribution system in attic, furred space
or crawl space should be insulated with at least 2" of insulation with vapor barrier. One-
DO NOT, uNDER ANy CIRCuM-
STANCES, CONNECT RETuRN DuCT-
wORK TO ANy OThER hEAT pRO-
DuCINg DEVICE SuCh AS A fIRE-
pLACE INSERT, STOVE, ETC.
uNAuThORIzED uSE Of SuCh
DEVICES MAy RESuLT IN fIRE, CAR-
BON MONOxIDE pOISONINg, ExpLO-
SION, pROpERTy DAMAgE, SEVERE
pERSONAL INjuRy OR DEATh.
s
WARNING
!
fIguRE 10
pACKAgED AIR CONDITIONER
FLAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING DISTRIBUTION
SYSTEM. MOUNTED ON ROOFCURB. CURB MUST BE LEVEL
ST-A1142-10
12