Unit Support; Duct Connection - Lennox KHC092 Installation Instructions Manual

S Air filters must be replaced and pre-filter must be
removed upon construction completion.
S The unit components, duct system, air filters and
evaporator coil must be thoroughly cleaned following
final construction clean-up.
S The unit operating conditions (including airflow,
cooling operation, and heating operation) must be
verified according to these installation instructions.
This appliance is not to be used by persons with reduced
physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given
supervision or instruction.
This appliance should not be used by children. Children
should be supervised to ensure they do not play with the
appliance.
WARNING
Electric shock hazard and danger of
explosion. Can cause injury, death or
product or property damage. Turn off
electrical
performing
servicing operations on the unit.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent­
ing of refrigerant (CFC's and HCFC's) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incar­
ceration may be levied for non-compliance.

Unit Support

NOTE - Securely fasten roof frame to roof per local codes.
CAUTION
To reduce the likelihood of supply / return air by­
pass and promote a proper seal with the RTU, duct
work / duct drops / diffuser assemblies must be
supported independently to the building structure.
A-Downflow Discharge Application
Roof Mounting with C1CURB
1- The C1CURB roof mounting frame must be installed,
flashed and sealed in accordance with the
instructions provided with the frame.
2- The C1CURB roof mounting frame should be square
and level to 1/16" per linear foot (5mm per linear
meter) in any direction.
3- Duct must be attached to the roof mounting frame
and not to the unit; supply and return plenums must
be installed before setting the unit.
power to unit before
any maintenance
Installer's Roof Mounting Frame
Many types of roof frames can be used to install the unit,
depending upon different roof structures. Items to keep
in mind when using the building frame or supports are:
1- The unit base is fully enclosed and insulated, so an
enclosed frame is not required.
2- The frames or supports must be constructed with
non-combustible materials and should be square and
level to 1/16" per linear foot (5mm per linear meter)
in any direction.
3- Frame or supports must be high enough to prevent
any form
Recommended minimum frame height is 14"
(356mm).
4- Duct must be attached to the roof mounting frame
and not to the unit. Supply and return plenums must
be installed before setting the unit.
5- Units require support along all four sides of unit base.
Supports must be constructed of steel or suitably
or
treated wood materials.
NOTE-When installing unit on a combustible surface for
downflow discharge applications, the C1CURB roof
mounting frame is required.
B-Horizontal Discharge Applications
1- Units installed in horizontal airflow applications must
use a horizontal conversion kit (K1HECK00).
2- Specified installation clearances must be maintained
when installing units. Refer to figure 1.
3- Top of support slab should be at least 4" (102mm)
above the finished grade and located so no run-off
water from higher ground can collect around the unit.
4- Units require support along all four sides of unit base.
Supports must be constructed of steel or suitably
treated wood materials.

Duct Connection

All exterior ducts, joints, and openings in roof or building
walls must be insulated and weatherproofed with flashing
and sealing compounds in accordance with applicable
codes. Any duct passing through an unconditioned space
must be insulated.
In downflow applications, do not drill or punch
holes in base of unit. Leaking in roof may occur if
unit base is punctured.
Page 4
of moisture from
!
CAUTION
entering unit.