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SECTION 3: CRITICAL CONSIDERATIONS
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required clearances to
combustibles away from equipment.
Some objects will catch fire or explode when
placed close to equipment.
Failure to follow these instructions can result
in death, injury or property damage.
WARNING
Explosion Hazard
Fresh air supply duct and burner housing
must be purged with fresh air four times
before every ignition.
Explosive vapors will ignite if not evacuated
before ignition attempt.
Failure to follow these instructions can result
in death, injury or property damage.
3.1 Required Clearances to Combustibles
Clearances are the required distances that
combustible objects must be away from the air
handler to prevent fire hazards. Combustibles are
materials that may catch on fire and include common
items such as wood, paper, rubber, fabric, etc.
Maintain clearances to combustibles at all times
for safety.
Check the clearances on each air handler being
installed to make sure the product is suitable for your
application and the clearances are maintained.
Clearances to combustibles are 12" (30.5 cm) on the
control enclosure side and 6" (15.2 cm) on all other
surfaces. Read and follow the safety guidelines
below:
• Locate the air handler so that the air intakes are
not too close to any exhaust fan outlets, gasoline
storage, propane tanks or other contaminants that
could potentially cause dangerous situations.
• Keep gasoline or other combustible materials
including flammable objects, liquids, dust or
vapors away from this air handler or any other
piece of equipment.
• Maintain clearances from heat sensitive material,
equipment and workstations.
Clearances to combustibles do not denote
clearances for accessibility. Minimum clearance for
access is 48" (122 cm). Minimum clearance for
accessibility applies to the control enclosure, blower
access panel and filter access panel (when
equipped).
The stated clearances to combustibles represent a
surface temperature of 90° F (50° C) above room
temperature (90° F [50° C] plus ambient
temperature). Building materials with a low heat
tolerance (i.e. plastics, vinyl siding, canvas, tri-ply,
etc.) may be subject to degradation at lower
temperatures. It is the installer's/owner's
responsibility to assure that adjacent materials are
protected from degradation.
•
Maintain clearances from vehicles parked below the
air handler. See Page 7 , Section 4.4.
SECTION 3: C
C
RITICAL
ONSIDERATIONS
5
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