SECTION 3: C
RITICAL
C
ONSIDERATIONS
5
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Re
q
uired Clearances to Combustibles
Clearances are the req
u
ired distances that
comb
u
stible objects m
u
st be a
w
ay from the air
handler to pre
v
ent fire hazards. Comb
u
stibles are
materials that may catch on fire and incl
u
de common
items s
u
ch as
w
ood, paper, r
u
bber, fabric, etc.
Maintain clearances to combustibles at all times
for safety.
Check the clearances on each air handler being
installed to make s
u
re the prod
u
ct is s
u
itable for yo
u
r
application and the clearances are maintained.
Clearances to comb
u
stibles are 12" (30.5 cm) on the
control enclos
u
re side and 6" (15.2 cm) on all other
s
u
rfaces. Read and follo
w
the safety g
u
idelines
belo
w
:
• Locate the air handler so that the air intakes are
not too close to any exha
u
st fan o
u
tlets, gasoline
storage, propane tanks or other contaminants that
co
u
ld potentially ca
u
se dangero
u
s sit
u
ations.
• Keep gasoline or other comb
u
stible materials
incl
u
ding flammable objects, liq
u
ids, d
u
st or
v
apors a
w
ay from this air handler or any other
piece of eq
u
ipment.
• Maintain clearances from heat sensiti
v
e material,
eq
u
ipment and
w
orkstations.
Clearances to comb
u
stibles do not denote
clearances for accessibility. Minim
u
m clearance for
access is 48" (122 cm). Minim
u
m clearance for
accessibility applies to the control enclos
u
re, blo
w
er
access panel and filter access panel (
w
hen
eq
u
ipped).
The stated clearances to comb
u
stibles represent a
s
u
rface temperat
u
re of 90° F (50° C) abo
v
e room
temperat
u
re (90° F [50° C] pl
u
s ambient
temperat
u
re). B
u
ilding materials
w
ith a lo
w
heat
tolerance (i.e. plastics,
v
inyl siding, can
v
as, tri-ply,
etc.) may be s
u
bject to degradation at lo
w
er
temperat
u
res. It is the installer’s/o
w
ner’s
responsibility to ass
u
re that adjacent materials are
protected from degradation.
•
Maintain clearances from
v
ehicles parked belo
w
the
air handler.
See Page 7, Section 4.4
.
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.
