Bosch NGM8656UC Installation Instructions | Page 11

Bosch Gas Cooktop Installation Instructions - NGM8656UC.
Download
Page  of 36
4.2, 1851 votes
background image

11

2. Remove knobs.

Note:  All cooktops have hollow stem valves except 

the center valve on the NGMP units which is a solid 

stem. Solid stem valves do not need to be adjusted.

3.

Hollow Stem Valves (all burners except center valve 

of NGMP units): insert a long, thin flat blade 

screwdriver in the hollow stem of the valve. The 

adjustment screw is approximately 1 1/2" (39 mm) 

from the top of the stem.

4. Engage the tip of the screwdriver into the adjustment 

screw by slowly turning the screwdriver and feeling for 

the blade to engage the screw. Then turn the screw 

clockwise about 70 degrees (less than 1/4 turn) until it 

“bottoms out” (does not turn any further). The screw 

does not take much force to turn. Once the screw 

does not turn any further, stop. Do not overtighten. 

Repeat for each valve until all have been adjusted 

correctly.

5.

Hollow Stem Valve: Replace the knob. 

Check Installation

Test for gas leaks

9

WARNING

NEVER TEST FOR GAS LEAKS USING A FLAME
If any leaks are detected, do not proceed past this 

step until all leaks have been eliminated.

Leak testing is to be conducted by the installer according 

to the instructions given in this section.
Turn on gas. Apply a non-corrosive leak detection fluid to 

all joints and fittings in the gas connection between the 

shutoff 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. An electronic 

Gas Leak Detector can also be used.
If a leak appears, turn off the supply line gas shutoff 

valve and tighten the leaking connections. Retest for 

leaks by turning on the supply line gas shutoff valve. 

When the leak check is complete (no bubbles appear), 

the test is complete. Wipe off all detection fluid residue.

Check manifold gas pressure
During any pressure testing of the gas supply piping 

system at test pressures greater than 14" of water 

column pressure (approximately ½" psig, 3.5 kPA) it is 

necessary to disconnect the cooktop and its individual 

shut-off valve from the gas supply piping system.

If it should be necessary to check the manifold gas 

pressure, connect a manometer (water gauge) or other 

approved gas pressure reading device to the top burner 

right rear orifice. Using a rubber hose with inside 

diameter of approximately 1/4" hold tubing down tight 

over orifice. Turn burner valve on.

Final check
After conversion is complete, place each correct sized 

burner cap in its seated, notched position and check the 

operation of the electric igniters. Check flame 

characteristics. Flame should be blue with a minimal 

yellow tip on the outer cone of the flames.

Check flame characteristics

If the flame is completely or mostly yellow, verify that 

the regulator is set for the correct fuel. After 

adjustment, retest.

Some yellow streaking is normal during the initial start-

up. Allow unit to operate 4 to 5 minutes and re-

evaluate before making adjustments.

êLQ

PP

2))

+,

/2

Yellow flames:
Further adjustment is required.

Yellow tips on outer cones:
Normal for LP Gas.

Soft blue flames:
Normal for Natural Gas.

Related Manuals for Bosch NGM8656UC

0.596429s