9
Grille
Side Panel
Figure 9. Remove Side Panel and Grille
2. Install suspension rods in the structural
ceiling or concrete slab in a suitable location.
If the structural ceiling is constructed of concrete,
install anchors to accept four suitably sized threaded
rods to suspend the indoor unit. If the structural ceiling
includes wooden joists, use angle iron or Unistrut
channel fixed securely in place to accept the threaded
rods.
3. Slide one nut and one washer onto each threaded rod.
Threaded
Rod
Anchor
Wooden
Joist
Threaded
Rod
Angle Iron Bolted
in Place Across
Wooden Joists
CONCRETE CEILING
USING ANCHORS
ANGLE IRON
ACROSS WOODEN
JOISTS
Figure 10. Locate Threaded Rods
4. Use electrical tape to keep the washer from falling off.
Position the nuts
5. Slide a second washer and then a second nut onto
each rod slightly above the final resting place of the
hanging brackets.
6.
If necessary, install a field-provided isolation grommet
to prevent transmission of vibration from unit to
structural ceiling.
Threaded Rod
Suspension
Bracket
Leveling
Nut
Washer
Field-Provided
Isolation
Grommet
Figure 11. Locate Bracket on Threaded Rod
7. Use either a mechanical lifting device or a minimum of
two people to raise the unit.
8. Hang the unit by sliding the factory-installed hanging
brackets on to the threaded rods between the sets of
washers and nuts.
9. Use the leveling nut (beneath hanging brackets)
to adjust the unit to the correct height. Remove the
electrical tape holding the upper washers and nuts
in place and tighten each of the four nuts above the
brackets down onto the brackets. This will ensure that
the unit remains level.
Indoor Unit Condensate Piping Connections
IMPORTANT
Make sure that drain piping is properly routed and
insulated to prevent both leaks and condensation.
1.
Use a field-provided hose clamp to secure the drain
line stub on the side of the cassette base to a field-
supplied 1” (25 mm) drain line.
NOTE:
Take care not to over-tighten the hose clamp as
this may damage the drain line stub.
NOTE:
Connection between stub and drain line must be
watertight. Apply non hardening plumbing joint
compound if needed to ensure a watertight seal.
2.
Confirm proper slope (not less than 1/4 inch per foot
(18 mm per m)) and routing of condensate lines to
ensure moisture is drained away from the indoor unit.
3. Drain should be as short as possible and should
not have any droops or kinks that would restrict
condensate flow and shall be approved resistant pipe.
There must be a 2-inch (51 mm) space between
the end of the condensate drain and the final
termination point (ground, open drain, etc.) to
ensure that the line will drain freely.
4. After the system installation is complete, the
condensate drain line must be checked for leaks and
proper drainage. If a field-provided condensate pump
has been installed, it must be checked to ensure proper
operation. This check is part of the start-up process
which must be done by the installing contractor.
IMPORTANT
Drain should have a slope of at least ¼ inch per foot and
should be approved corrosion-resistant pipe. You must
confirm operation of every drain and pump in the system
as part of the commissioning procedure.
DRAIN LINE
Slope at least 1/4”
per foot (18 mm per M)
3 ft. (1 m)
SUPPORT
STRAPS
Figure 12. Indoor Unit Suspended from Ceiling
using a Properly Sloped Gravity Drain
