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STEP 4
Pm THE DU~ RUN
1. Make a sketch of the total system.
Identify the type of each fitting and the length of
straight pipe.
2. Enter your run into the Duct hngth Chart in
this guide. Elbows,wall caps and other fittings
are shown in the chart with their equivalent
straight duct length. Each fitting value must be
added to the amount of straight duct length used
to determine the overall straight duct equivalent
length. Use the followingexamples as a guide.
3. Using good quatity ducting material, install
per these instructions. A few minutes and
pennies spent now willpay long term dividends
for the ~ie of the cooktop.
I
STEP 5
lMST~L THE DUCNORK
Ducting must conform to local code materials
and "makeup" requirements-300 CFM
minimum.
IMPORT~
Saveforlocalelectrical
inspector's use.
. Ductinga cooktop
is easy but critical for
proper performance.
After reading these instructions,plan the
duct run.
Use the "Duct bngth Chart" to find the
equivalent length of the run.
Shift the blower to "high range" if indicated
(done by snapping the "restricted ring" out of the
blower inlet). Be sure blower is not running.
Install the duct hardware.
IMPORT~
Toti Mowmce duct system is:
90 with 6
round wd mp
80 witi 3~x10
W~ ~p
hw range is up to 60
High me
is 61 to 90'
GENEN
CONSIDERA~ONS:
1. Use 6' diameterround or 3WX1W rectan~h o*.
2. Use a Y to Wtransition (or a Y round to
3%'xIVrectigular transition) at the blower outiet.
The number of additional elbows or transitions in
the system should be hted
to three.
3. Use quality metal duct of at least 26 gauge
galvanized or 24 gauge aluminum. Inferior
quality pipe and fittings can cause up to twice the
restriction shown and is a poor value. See the
Prepare for Duct Work section of this guide for
optionalunder-slab ducting. bcal codes may
require a heavier gauge material or restrict PVC.
4. Distance between adjacent fittings (elbows,
transitions, etc.) should beat least lW. me
further the better. Closer distice promotes
turbulence which reduces airflow.
5. Handmadecrimpsare Web to cause restrictions.
6. Han alternate wall or roof cap is used, be
certain duct size is not reduced, and that there is
a backdraft damper. It is best to use listed caps to
be certain of proper performance.
7. Thermal breaks: In areas of extreme cold
weather, it maybe necessary to provide a short
length of nonmetallic duct as close to the wall as
possible,to preventconductionalongthe meti dud
8. High akitudeinitiations It is advisableto
reduce Nowable duct run by 2~.
9. Foflowthe duct cakulation in this guide
=efuMy for best performance and satisfaction.
STEP b
SHIFTING
THE BLOWER FROM "LOWWGE"
TO "HIGH WNGE"
This
cooktop is equipped with a dual range
blower. It is shipped from the factory in low
range for most installations. E the Equivalent
Duct bngth exceeds 60 feet it must be shifted to
high range. Do not shift to high range for
shorter lengths. This willcause excessive noise
and loss of conditioned air.
To shift to high range
be sure the blower is
stopped. Removethe
.f
o
/-::.,
vent grill. Remove the
filter and intake guard.
~:~-'- ~
Pop the spring loaded
,,
"restricted ring" out of
;,,
, ,;'
the blower inlet. Replace
~,'; , ;:"'
t~d$l~re guard, grill
(continuednd page)
17
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