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General Installation Information cont.
Installing Horizontal Units
Remove and discard the compressor hold down shipping bolt
located at the front of the compressor mounting bracket 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 (The 024 model requires
an additional discharge panel). Horizontal units are normally
suspended from a ceiling by four or six 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 in Figure 3.
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
Figure 2: Horizontal Unit Mounting
Threaded Rods
Flexible Duct
Collar
Insulate supply
plenum and use
To Line
at least one 90
O
Power
elbow to
reduce noise
To
Thermostat
Electrical
Disconnect
Line Voltage
Building Water Loop
Hanging
Brackets
(Included)
Hose
Kits
9
DUAL COMPRESSOR PACKAGED HEAT PUMP INSTALLATION GUIDE
could loosen a single nut. To allow filter access, one
bracket on the filter side should be installed 180° from the
position shown in Figure 3. The unit should be pitched
approximately 1/4-inch 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.
CAUTION: Do not use rods smaller than 3/8-inch
diameter since they may not be strong enough
to support the unit. The rods must be securely
anchored to the ceiling.
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