Bosch NGM8646UC Installation Instructions | Page 10

Bosch Gas Cooktop Installation Instructions - NGM8646UC.
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10

Side View Gas Cooktop Installation

Gas and Electrical Location

Connect the gas supply line to the unit pressure 

regulator using a 1/2” flex gas line connector between 

manual shut-off valve and pressure regulator. Always use 

a new flex line.

Check supply line connections for leaks using a soap 

solution or non-corrosive leak detection fluid. Do not use 

a flame of any sort.

1. Turn on gas.
2. Apply a soap solution or non-corrosive leak detection

fluid to all joints and fittings in the gas connection

between the shut-off valve and the cooktop. Include

gas fittings and joints in the cooktop if connections

may have been disturbed during installation. Bubbles

appearing around fittings and connections indicate a

leak.

3. If a leak appears, turn off supply line gas shut-off valve

and tighten connections.

4. Retest for leaks by turning on the supply line gas shut-

off valve. When leak check is complete (no bubbles

appear), test is complete.

5. Wipe off all soap solution or detection fluid residue.

Important Notes for Gas Connection:

The appliance and its individual gas shutoff valve must

be disconnected from the gas supply piping system

during any pressure testing of that system at test

pressures in excess of 1/2 psi (3.5kPa).

The appliance must be isolated from the gas supply

piping system by closing its individual manual shut-off

valve during any pressure testing of the gas supply

piping system at test pressures equal to or less than

1/2 psi (3.5kPa).

Connect Electrical Supply
Before connecting the 5-foot (1.5m) supply cord to a wall 

receptacle, make certain that gas shut-off valve and all 

burner controls are in OFF position.

Burner Cap and Burner Base Placement

9

WARNING

To prevent flare-ups, do not use the cooktop without 

all burner caps and all burner grates properly 

positioned.

9

WARNING

To prevent burns, do not touch burner caps or 

grates while hot. Turn the cooktop off and allow the 

burners to cool.

The burner caps must be properly placed for the cooktop 

to function properly. If the burner cap is not properly 

placed, one or more of the following problems may 

occur:

Burner flames are too high.

Flames shoot out of burners.

Stainless steel discolors.

Burners do not ignite.

Burner flames light unevenly.

Burner emits gas odor.

A

Rough-in Cooktop Box

B

Arrow on Pressure Regulator

C

Pressure Regulator

D

1/2” Female Pipe Threads

E

Flexible Gas Line

G

Power Cord (60 inches/1,524mm)

H

120 Volt Receptacle

J

Gas Cut-off Valve

K

Gas Supply Line Stub-out

L

Floor

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Arrow on the back of 
the pressure regulator 
shows the direction of 
gas flow.

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