GE JGP979 Owner's Manual page 23

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.
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