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GE JGP979 Owner's Manual page 23

Gas downdraft cooktop
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Installation
Instructions
[]
PLAN THE DUCT RUN
1, Make a sketch
of tile total systenl.
IdentiI}'
tile
type of each fitting
and tile length
of straight
pipe.
Reti_r to tile exalnples
on page
24.
2. Enter
your lun
into tile Duct
I,ength
Chart
on
page
25. Elbows,
wall caps and
other
fittings
are shown
in the chart
with their
equiwdent
straight
duct
length.
Each fitting
\Mue
n/ust
be
added
to the anlount
of straight
duct length
used to deternline
the overall
straight
duct
equiwdent
length.
Use the tollowing
exanlples
as a guide.
3. Using
good
quality
ducting
nlaterial,
install
per
these
instluctions.
A tew lninutes
and pennies
spent
now will pay long ternl
dividends
fin" tile
life of tile cooktop.
[]
INSTALL THE DUCTWORK
•Ducting
nlust
conflmn
to local
code nlaterials
and "lnake-up"
requirenlents--300
CFM nliniulunl.
• IMPORTANT:
Save fin" local
electrical
insl)ector's
rise.
• Ducting
a cooktop
is easy but critical
tor i)roper
l)eI'J[OI'Illa
lice.
• _Mier reading
these insmlctions,
plan the duct run.
• Use the Duct Iongth
Chart
on page
25 to find the
equiwdent
length
of the lun.
•Shitt
the blower
to "high
range"
if indicated
(done
by snai)i)ing
the "restricter
ring"
out of
tile blower
inlet).
Be sure
blower
is not lunning.
• histall
the duct
hardware.
IMPORTANT
Total
allowance
duct system
is:
90 ft. with 6" round
wall cap
80 ft. with 3¼" x 10" wall cap
Low rmage is up to 60 ft.
High
rmage is 61 to 90 ft.
GENERAL
CONSIDERATIONS:
1. Use 6" dianleter
round
or 3¼" x 10" rectangular
only except
as tollows:
For gas nlodels,
5"
dianleter
round
lnust
be used if tile straight
duct length
is 10 tibet or less, using
5" round
wall cap.
2. Do not use 5" elbows except
in a 5" svsteln..
hIstead,
use a :3" to 6 transition
followed
by a
6" elbo_,
or a 5" to 3¼" x 10" elbow
transition.
3,
4,
5,
Use quality
nletal
duct
of at least 26-gauge
galvanized
or 24-gauge
ahuninunl,
hIli_rior
quality
pipe and fittings
can cause
up to twice
the restriction
shown
and is a poor
wdue.
See
the
Proparo for Duct Work
section
of this guide
tor optional
undel=slab
ducting.
I,ocal
codes
nlay require
a heavier
gauge
nlaterial
or
restrict
PVC.
[]
Distance
between
a(!jacent
fittings
(elbows,
transitions,
etc.) should
be at least 18". The
tarther
tile better.
Closer
distance
i)rolnotes
turbulence
which
reduces
airflow.
Tile
ntlI//beI"
of
downstrealll
elbows
or
transitions
should
be lin/ited
to three.
Tile initial
5" to 6" straight
transition,
if used, need
not be
counted
in this nunlber.
6. Handnlade
ClJlnps are likely to cause restrictions.
7. If an alternate
wall or roof cap is used, be
certain
duct size is not reduced
and
that there
is a backdratt
dalni)er.
It is best to use listed
caps to be certain
of i)roper
i_erflwlnance.
8. Thernlal
breaks:
In areas
of extrenle
cold
weathel;
it nlav be necessary
to provide
a short
length
of nonnletallic
duct as close to the wall
as possible
to i)revent
conduction
along
tile
nletal
duct.
9,
10.
High altitude
installations:
It is advisable
to
reduce
allowable
duct run bv 20%.
Follow tile duct calculation
in this guide carefully
fin" best i)ell'iwlnance
and satisthction.
SHIFTING
THE BLOWER FROM
"LOW
RANGE" TO "HIGH
RANGE"
This cooktop
is equipped
with a dual range
blower.
It is shii)ped
ti'oln
tile tactorv
in low range
fill" lnost
installations.
If tile Equivalent
Duct
I.ength
exceeds
60 teet,
it nlust
be shilied
to high
range.
Do not shili to high
range
tor shorter
lengths.
This will cause
excessive
noise,
conditioned
air loss and attect
tile flanle
pattern
on
g_ls
bllI'neI's.
To shill to high
range,
be sure tile blower
is
stopped.
Relnove
the
air grille.
Relnove
the
filter
and intake
guard.
Pop the si)ring
loaded
"restricter
ring"
out of
._.-
tile blowel _inlet.
,_
Replace
the intake
guard,
grille and
filter.
23

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