Bosch NHT 72 Series User manual

@BOSCH
Use and Care Manual
for
Bosch Gas Built-In Cook-Tops
Models NHT 72... and NHT 92...
WARNING: If the informationinthismanualis notfollowedexactly,a fire orexplosionmay ]
resultcausing property damage,personal injury ordeath. I
Do not store oruse gasolineorotherflammablevaporsand liquidsin thevicinityof this or
any otherappliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance;
•Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's
instructions.
•Ifyou cannot reach your gas supplier, call the fire department.
Installation and service must be performed by aqualified installer, service agency or the
gas supplier.
(
i
1
INSTALLER: Please leave this manual with owner.
OWNER: Please keep this manual for future reference.
READ ALL INSTRUCTIONS BEFORE USING THIS APPLIANCE.

DearBoschcook-Topowner:
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ifyouhaveneverbeforeuseda,_assealedburnercook-toil.Please.pay.particularattenaontothesafityInstructtons
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BSH Home Appliances
Model Information
The model/rat_ngRlate, located on the bottom surface of the cook-top, shows the model number and serial
number 0f your cook-t0 p. This is information you will need ifyo_ cook-top should ever need service.
As a handy reference, copy the information from the model/rating plate in space provided below. Also keep
your invoice. The invoice as well as the information listed below will be required for warranty validation.
Model No.
Serial No.
Date of Purchase
Dealer's Name
Dealer's Phone
Bosch Authorized
Service Contractor
Contractor'sPhone

Table of Contents
Cover Page
ThankYou 2
Model Information 2
Table of Contents 3
Important Safety Instructions
Product Features
The Parts of Your Cook-Top
Grates and Burner Caps
Sealed Burners
4-5
6
6
7
7
Cook'wareTips
SpecialNotes RegardingCookware
SpecialNotes rRegardingCanning
Cook-To p Operation
Control Knob and Valve Operation
Burner Flame Adjustment and Suggested SeRings
In Case of Power Failure
Energy Saving Tips
Care and Cleaning
Before Using for the First Time
Grates and Cook-Top Surface
Knobs and Spill Protector Grommets
Sealed Burners
8
8
8
9
9
10
I0
10
II
II
II
12
12
Problem Solving
Before Calling for Service
Service and Repair
Statement of Limited Warranty
13
14
15
3

IMPORTANT SAFETY INSTRUCTIONS
WARNING - When using this appliance, basic safety precautions should always be followed to
reduce the risk of fire, explosion, electric shock and/or injury to persons, including the following.
Proper Installation - Be sure your appliance has been properly installed by a qualified technician,
that the cook-top has been connected to the type of gas as marked on the rating plate and that
the cook-top has been checked for leaks and properly grounded in accordance with local codes or, in
the United States, the NATIONAL ELECTRICAL CODE, ANSI/NFPA 70; in Canada, CSA
Standard C22.1, the CANADIAN ELECTRICAL CODE. Have the installer show you where the gas
shnt-offvalve is located so that you know where to turn offthe gas supply. Also, have the installer
show you the location of the breaker or fuse box that supplies electrical power to the cook-top.
Leak testing of the appliance shall be conducted according to the manufacturer's instructions.
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3.
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5_
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Never Use Your Appliance for Warming or Heating the Room.
Do Not Leave Children Alone - Children should not be lei_ alone or unattended in area where the
appliance is inuse. They should never be allowed to sit or stand on any part of the appliance.
Wear Proper Apparel - Loose-fitting or hanging garments should never be worn while using the
appliance. Never let clothing, potholders or other flammable materials come in contact with the
burners while in operation. Fabric may ignite and result in personal injury.
User Servicing - Do not repair or replace any part of the appliance unless specifically
recommended in the manual. All other service should be referred to a qualified technician.
Storage in or on Appliance - Do not store flammable materials on or near this appliance. The
flammable vapors can create an explosion and/or fire hazard.
Do Not Use Water on Grease Fires - Smother fire or flame or use dry chemical or foam type
extinguisher.
.
9_
10.
11.
Use Only Dry Potholders - Moist or damp potholders on hot surfaces may result in bums from
steam. Do not let potholder touch hot heating elements. Do not use a towel or other bulky cloth.
Use Proper Pan Size - Select utensils of the proper size. Choose flat bottomed cookware; the pot
or pan should never rock on the grates. An unstable pan can result in spills and uneven cooking.
The pan should be large enough to hold the desired quantity of food without spilling or boiling
over. Choose a pan with a well-designed handle that provides suitable grasping area for its weight.
Do not use utensils with loose handles. The utensil chosen should be of adequate size to assure
that the flame size does not extend beyond the bottom edge of the pan.
Never Leave Cook-Top Unattended at High Heat Settings - Boil over causes smoking and
greasy spillovers that may ignite.
Glazed Cooking Utensils - Because of the potential for breaking due to the sudden change
in temperature, only certain types of glass, glass/ceramic, ceramic, earthenware, or
other glazed utensils are suitable for range-top use.

IMPORTANT SAFETY INSTRUCTIONS (continued)
12. Caution when Deep Frying - When deep frying be sure to use a pan that is large enough to
hold the food to be fried without overflowing. Never leave adeep fryer unattended. To
avoid excessive splattering of hot oil, never deep fry moist or frost-covered foods. Be
sure to use a deep frying thermometer to avoid overheating the oil. Most foods should be
fried at about 375°F, while large solid pieces should be fried at 340°F.
13. Utensil Handles Should Be Turned Inward and Not Extend Over Adjacent Surface
Units - To reduce the risk of bums, ignition of flammable materials, and spillage due to
unintentional contact with the utensil, the handle of a utensil should be positioned so that it
is turned inward, and does not extend over adjacent surface units.
14. Do Not Touch Grates, Burner Caps or Burner Bases or Other Parts Close to the Burner
Flames - Grates, burner caps, burner bases and other parts close to the flame may become hot
enough to cause bums. During and after use, do not touch, or let clothing or other flammable
materials contact these items or areas until they have had sufficient time to cool.
15. Do Not Cook on Broken Cook-Top - If cook-top should break, cleaning solutions and
spillovers may penetrate the broken cook-top and create a risk of electric shock; contact a
qualified technician immediately.
16. Clean Cook-Top With Caution -Ifa wet sponge or cloth is used to wipe spills on a hot
cooking area, be careful to avoid steam burn. Some cleaners can produce noxious fumes if
applied to a hot surface.
17. Check for OffWhen Done - Always checktheposition of thecook-topcontrolknobs
when you have finished cookingto makesurethey are all intheoffpositi0ns.
Is. "CAUTION" - Do not store itemsof interest to childrenin cabinetsabovethe
cook-top -children climbingon the cook-top to reachitemscould be seriously injured.
19. Do Not cover the Burners and Grates - Do not cover the burners or grates with anything other
than properly selected pots or pans. Decorative covers, cutting blocks, etc. should not be used on
the grates or burners.
20. Do not Heat Sealed Containers - Do not heat unopened food containers, such as bottles
or cans of sauce, baby food, etc. Pressure build up in a sealed container may cause the container
to fail catastrophically causing injury.
21. Conversions - Any additions, changes, or conversions required in order for the appliance to
satisfactorily meet the application needs must be made by a Bosch distributor, qualified service
technician, installer, service agency or the gas supplier using factory specified and approved parts.
22. Exposure warning - Gas fuels and their use in appliances can cause minor exposure to benzene,
formaldehyde, carbon monoxide and soot, primarily from incomplete combustion. Significant
exposure to these substances can cause cancer or reproductive harm. Properly adjusted burners with
blue, rather than a yellow flame, will minimize incomplete combustion. Venting with a hood or an
open window will further minimize exposure.
5

Product Features
The cooking surface of your Bosch gas cook-top
is either stainless steel or tempered glass. And
whetherglassor stainless steel,thecook-top
surfaceprovidesasmooth and non-poroussurface
thatiseasilycleaned.
In addition, all Bosch gas cook-tops are equipped
with sealed burners that spread the flame evenly
across the bottom of your pots and/or pans. The
burners all incorporate spark ignition with auto-
reignition that will automatically spark in an
attempt to relight a burner that has gone out.
Gaskets at the burner base prevent any spilled
liquid from entering the body of the cook-top.
The Parts of Your Cook-Top
Below you will find an illustration of a Bosch
cook-top identifying the various parts.
The models NHT 722 AUC, NHT 725 AUC and
NHT 726 AUC are 30 inch wide cook-tops
having 4 sealed gas burners, 2 large burners and
2 medium burners with auto-reignition.
The models NHT 922 AUC, NHT 925 AUC and
NHT 926 UC are 36 inch wide cook-tops having
5 sealed burners, 2 large and 3 medium
burners with auto-reignition.
Medium Burner )
I
Large Burner ' J
Control Panel
I
Burner Cap
Medium
Figure 1. Parts Identification, NHT 92 shown

Grates and Burner Caps
The top surface of the grates and the burner caps
are covered with a porcelain enamel coating. This
coating not only serves to protect the grates and
burner caps from oxidation, but also provides
ferrous components an attractive finish.
The porcelain enamel coating on the burners and
grates undergo extreme thermal and mechanical
conditions; far more severe than experienced by
any other porcelain enamel surface in your kitchen.
This means that over time, due to these severe
conditions, the porcelain enamel coating of these
components will inevitably undergo a change in
appearance. This is in addition to any damage they
may receive from the utensils that may be used on
them. Special attention to the care and cleaning of
the grates and burner caps will slow the changes in
appearance, but will not eliminate them. See the
Care and Cleaning section of this manual for
recommendations for maintaining the appearance
of your cook-top.
Sealed Burners
The cook-top has sealed gas burners designed to
spread the heat evenly across the bottom of your
cooking utensils. Each burner is equipped with a
spark igniter to light the burner and each burner
incorporates auto-reignition in case a flame is
blown out. The burners on the Bosch cook-tops
have been set at the factory for use in Natural Gas.
The cook-top can be converted for use on
LP/Propane, but such a conversion should only be
performed by a qualified service technician.
LP/Propane conversion kits can be ordered from
your dealer
The Bosch gas cook-top comes in two basic sizes:
•The 30 inch, 4 burner, models:
•NHT 722 AUC
•NHT 725 AUC
NHT 726 AUC
have four sealed burners: two large burners
rated at 12,500 BTU/Hr maximum input and
two medium burners rated at 6,000 BTUPHr
maximum input. The two large burners are
located at the front of the cook-top, while the
two medium burners are located at the rear.
The 36 inch, 5 burner, models:
• NHT 922 AUC
• NHT 925 AUC
• NHT 926 AUC
have five sealed burners: two large burners
rated at 12,500 BTU/Hr maximum input and
three medium burners rated at 6,000 BTU/Hr
maximum input. The two large burners are
located at the front of the cook-top, while the
three medium burners are located at the rear.
See Figure 1 on page 6.
The large burners are intended to be used for
cooking large quantities of food, deep frying
and/or cooking with large diameter pots or pans.
The medium burners are to be used for simmering,
for cooking smaller quantities of food, or when
using smaller diameter pots or pans.
The burners used are of the sealed type, meaning
that the bottom of the burners, where they meet the
cook-top surface, are provided with gaskets (seals)
to prevent any spilled liquid from entering the
body of the cook-top. In this way any spilled
liquids are kept out of the cook-top and on the
surface for easy cleaning.
Figure 2. Sealed burner assembly
Base Ring Burner Cap Burner Ring
7

Cookware Tins
.,It-
Good utensils and the use of proper procedures are
essential for good cooking. Cooking performance
is greatly effeeted by the type of pots and pans
used. For best results we recommend the
following:
•Use pots and pans of heavy gauge metal with
fiat, thick, smooth bottoms. Glass or ceramic
cookware should only be used as
recommended by the cookware manufacturer.
• For best results and greater efficiency use only
fiat-bottomed cookware. Pots and pans with
rounded, either concave or convex, warped, or
dented bottoms should be avoided. Rounded
and uneven utensils are unstable when placed
on the grates and may scorch or burn food due
to uneven heating. The bottom of the utensil
should touch all grate support fingers evenly.
Utensils, whether full or empty, should never
reek on the grates.
•Choose pots and pans with handles made of
sturdy, heat resistant material that are secure!y
attached. Never use a pot or pan with aloose
handle.
• When possible be sure to cover the pots or pans
with a suitable lid. Proper fitting lids will help
shorten the cooking time and allow food to
cook in a minimum amount of liquid.
•Turn handles of pots and/or pans inward, but
not over other burners. This will help reduce
the chance of burns and spills due to bumping
the handle.
• Try to match the pot or pan size to the cooking
process.
• Select a pot or pan such that the flame height
required for the cooking process being used
does not extend beyond the edge of the pot or
pan. Flames that extend beyond the edge of a
pot or pan waste energy and can cause fires.
• Make sure that the bottom of the utensil being
used is clean and dry.
• When choosing or using specialty cookware,
such as pressure cookers, deep fat fryers, woks
or canning modules, be sure they meet all the
safety notices contained in this manual.
SPECIAL NOTES REGARDING
COOKWARE:
1. Do not use undersized pots or pans with large
handles that may overbalance the pot or pan as
these can easily tip causing spills.
2. Do not use utensils with rough bottoms as
these can cause permanent damage to the
porcelain coating on the grates.
3. Do not leave any empty pot or pan unattended.
Boil overs can cause smoking and greasy
spillovers that may ignite. Also pot or pans
can overheat causing smoking and may ignite
grease left in the pot or pan and damage the
pot or pan, grate and/or surface of the cook-
top.
SPECIAL NOTES REGARDING CANNING:
The high temperatures encountered for long
periods of time when using water bath or pressure
canners can damage the cook-top if they are used
improperly. To protect the cook-top we
recommend the following:
1. Center the canner/pan over the burner being
used. Large diamter canners/pans can trap heat
and cause damage to the cook-top if not
properly centered.
2. Do not attempt to use two burners at the same
time with the canner/pan. The cook-top will
become too hot and could become damaged.
3. Start the process with hot water. This will
reduce the amount of time that the burner is on
high. Then reduce the setting once water is
boiling, to the lowest position that will keep
the water boiling.

Cook-Top Operation
Before beginning to operate your Bosch gas, built-
in cook-top make sure:
•The cook-top has been installed by a qualified
technician who has tested for leaks and has
tested the operation of the cook-top.
• The burner rings, burner caps, grates, spill
protector grommets and knobs are in position.
•All packing materials have been removed from
the cook-top.
•All cook-top components are clean.
• That the gas and electrical power supplies to
the cook-top are operational and that there are
no leaks prior to operation.
Be sure tOread this Use and Care manual
completely before operating the cook-top.
Burn, Fire .and.Explosion Hazard
• Burner flame should not extend beyond
the edge of the cooking utensil. The
flame can burn you and can cause poor
cooking result.
•Be sure all controls are turned to OFF
when you are not cooking. Someone
could be burned or a fire could start ifa
burner is accidently left on.
•If the flame should go out while cooking
or if there is a strong gas odor, turn the
burners OFF. Wait five (5) minutes for
the gas odor to dissipate before relighting
the burner. If gas odor is still present, see
safety note on manual cover. Failure to
follow these precautions could result in
explosion or fire.
•Do not leave cook-top unattended when
cooking during a power failure. The
auto-reignition feature of your cook-top
will not operate during a power failure.
Unignited gas could result in a fire or
explosion.
Control Knobs and Valve Operation
The controls on the Bosch gas cook-tops each have
amark to the right of the knob, referred to as the
"Burner Designation" in Figure 3, showing which
burner they control. Each burner is equipped with
an electronic igniter. When acontrol knob is
turned more than 90 ° counter-clockwise the igniter
at each burner will begin to spark and will
continue sparking until the gas ignites at the burner
you have selected. To activate the gas control, first
depress the knob, then rotate the knob 90 ° counter-
clockwise to the HI position. The igniters may
spark a number of times before the burner lights.
This is normal.
RangeofOpem_
Figure 3. Gas Burner Control Knob
Visually check that the burner has been lit. If the
burner does not ignite, listen for the sparking of the
igniters (a clicking sound). Turn the control knob
to the OFF position. Check to make sure that the
electrical cord for the cook-top is firmly plugged
into the wall receptacle and check that the fuse has
not blown or the circuit breaker tripped for the
circuit the cook-top is plugged into.
If the burner has been properly lit, the flames
should be blue in color, carry completely around
the burner cap and should not flutter. You can then
adjust the flame to desired height. For lower flame,
continue turning counter-clockwise to desired
flame height. The flame height adjustment range is
designated in figure 3 by heading "Range of
Operation".
If the gas does not ignite after four (4) seconds,
turn the valve to the "Off' position. Wait 5
minutes for any gas to dissipate and then repeat the
lighting procedure.
9

The burners of the Bosch cook-top also incorporate
auto-reignition. This means that in the event that
the flame is blown out or distorted by a draft the
igniters will begin to spark automatically in an
attempt to relight the burner(s).
Note: If the igniters are wet or dirty they may
spark continuously even ifa flame is
present. Please see Care and Cleaning
section of this manual for proper cleaning.
Burner Flame Adjustment and Suggested
Settings
Below you will find a table of recommended
settings for various purposes. This Table 1is
merely a guide. When reviewing the table please
also consider:
• The settings should be increased for larger
quantities.
• The settings should be reduced for smaller
quantities.
• Reduce the flame if it is extending beyond the
edge of the pot or pan. A flame that extends
beyond the edge wastes energy, may heat the
handle and has the potential of causing a fire.
• When using pots or pans that are made from
poor conductors of heat, such as glass, ceramic
or cast iron, use low or medium flame heights
that only cover approximately 1/3 of the utensil
bottom. This WIU reduce the likelihood of
scorching.
Suggested Flame Settings
Recommended Usage
Melting small quantities, or to
maintain serving temperatures.
Settings
LO
Medium-Lo
Medium
Simmering small quantities or
melting large quantities.
Saut6ing and browning. Braising.
Pan frying. Simmering larger
quantities,
Medium-Hi High temperature frying, Pan
broiling.
HI Boiling water quickly.
Table 1.
In Case of Power Failure
In case of a prolonged power failure it is possible
to light the burner(s) you wish to use by using a
match. To light the burner during a power failure:
1. Hold a lighted match at the ports of the burner
that you wish to use
2. Turn the control knob to the HI position until
the flame is burning all the way around the
burner cap, then adjust the flame to the height
desired.
During a power failure it would be necessary to
light each burner separately, each time it is used.
Also please note that the auto-reignition feature
does not function during a power failure. Be sure
to check that all burner control knobs are in the
OFF position when you are finished.
Energy Saving Tips
Although the energy used for cooking is only a
very small percentage of the total energy used in a
typical home, there are nevertheless a number of
things that can be done to ensure efficient use of
your cook-top:
•Use pots and pans with thick, smooth metal
bottoms.
•Always use a lid.
•Minimize the amount of liquid or fat to reduce
cooking times.
•Use the lowest possible flame height to
complete the cooking process.
•Adjust the flame height to fit the size of the pot
or pan.
• After a boil has been attained, reduce the flame
height to maintain a simmer rather than a rolling
boil.
• Thaw foods prior to cooking.
lO