25
SYSTEM OPERATION
•
As indicated on the unit data plate, a minimum
clearance of 36” to any combustible material is required
on the furnace access side of the unit. All combustible
materials must be kept out of this area.
•
This 36” clearance must also be maintained to
insure proper combustion air and flue gas flow. The
combustion air intake and furnace flue discharge must
not be blocked for any reason, including blockage by
snow.
•
Adequate clearances from the furnace flue discharge
to any adjacent public walkways, adjacent buildings,
building openings or openable windows must be
maintained in accordance with the latest edition of the
National Fuel Gas Code ANSI Z223.1/NFPA 54.
•
Minimum horizontal clearance of 48” from the furnace
flue discharge to any electric meters, gas meters,
regulators and relief equipment is required.
Unit Precautions
•
Do not stand or walk on the unit.
•
Do not drill holes anywhere in panels or in the base
frame of the unit except where indicated. Unit access
panels provide structural support.
•
Do not remove any access panels until unit has been
installed on roof curb or field supplied structure.
•
Do not roll unit across finished roof without prior
approval of owner or architect.
•
Do not skid or slide on any surface as this may damage
unit base. The unit must be stored on a flat, level
surface. Protect the condenser coil because it is easily
damaged.
Roof Curb Installations Only:
Curb installations must comply with local codes and should
be done in accordance with the established guidelines of
the National Roofing Contractors Association.
Proper unit installation requires that the roof curb be
firmly and permanently attached to the roof structure.
Check for adequate fastening method prior to setting the
unit on the curb.
Full perimeter roof curbs are available from the factory
and are shipped unassembled. Field assembly, squaring,
leveling and mounting on the roof structure are the
responsibility of the installing contractor. All required
hardware necessary for the assembly of the sheet metal
curb is included in the curb accessory.
WARNING
To prevent possible equipment damage, property damage,
personal injury or death, the following bullet points
must be observed when installing the unit.
•
Sufficient structural support must be determined prior
to locating and mounting the curb and package unit.
•
Ductwork must be constructed using industry
guidelines. The duct work must be placed into the
roof curb before mounting the package unit. Our full
perimeter curbs include duct connection frames to be
assembled with the curb. Cantilevered type curbs are
not available from the factory.
•
Curb insulation, cant strips, flashing and general roofing
material are furnished by the contractor.
•
The curbs must be supported on parallel sides by roof
members.
•
The roof members must not penetrate supply and
return duct opening areas as damage to the unit might
occur.
NOTE: The unit and curb accessories are designed
to allow vertical duct installation before unit
placement. Duct installation after unit placement is not
recommended.
A
LL
CURBS
LOOK
SIMILAR
. T
O
AVOID
INCORRECT
CURB
POSITIONING
,
CHECK
JOB
PLANS
CAREFULLY
AND
VERIFY
MARKINGS
ON
CURB
ASSEMBLY
. I
NSTRUCTIONS
MAY
VARY
IN
CURB
STYLES
AND
SUPERSEDES
INFORMATION
SHOWN
.
CAUTION
See the manual shipped with the roof curb for assembly
and installation instructions.
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