24
RB SERIES ENGINEERING GUIDE
Installing Horizontal Units
Remove and discard the compressor hold down shipping screws
located on the outside of the cabinet prior to setting the unit in
place. Horizontal units are available with side or end discharge
and may be easily field converted by flipping the blower discharge
panel. Horizontal units are normally suspended from a ceiling by
four 3/8 in. diameter threaded rods. The rods are usually attached
to the unit by hanger bracket kits furnished with each unit. Lay
out the threaded rods per the dimensions below. Assemble the
hangers to the unit as shown. Securely tighten the brackets to the
unit using the weld nuts located on the underside of the bottom
panel. When attaching the hanger rods to the bracket, a double nut
is required since vibration could loosen a single nut.
NOTE: The unit should be pitched approximately 1/4 in. towards
the drain in both directions to facilitate the removal of condensate.
Use only the bolts provided in the kit to attach hanger brackets.
The use of longer bolts could damage internal parts. Some
residential applications require the installation of horizontal units
on an attic floor. In this case, the unit should be set in a full size
secondary drain pan on top of a vibration absorbing pad. The
secondary drain pan prevents possible condensate overflow or
water leakage damage to the ceiling. The secondary drain pan is
usually placed on a plywood base isolated from the ceiling joists
by additional layers of vibration absorbing material. Insulate supply
plenum and use at least one 90° elbow and flexible duct collar to
reduce noise.
CAUTION: Do not use rods smaller than 3/8 in.
diameter since they may not be strong enough to
support the unit. The rods must be securely anchored
to the ceiling.
Installation Notes cont.
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