GE Monogram ZGU375NS Technical Service Manual page 29

STEP 2
Replace All Burner and Valve Orifices
Orifice Size Stamped
A. To Remove the Cooktop
Cooktop removal is required for:
• Gas piping inspection
• Wiring service
• Valve replacement
• Jet holder service
• Manifold service
• Indicator light replacement
• Bezel replacement
To remove the cooktop:
1. Remove the valve knobs.
2. Remove the burner caps and main burner head (brass).
3. Remove the brass nut using a 1-1/16" socket or adjustable
wrench and lift the burner ring from the assembly.
4. Remove the large brass orifice tube from the center of each
burner base using a 25/32" socket.
5. Lift each burner base and disconnect the push-on
wire terminal from the spark electrode. Place
the burner base assemblies in a safe place.
Burner Head
(Brass)
Burner Ring
(Aluminum)
Locator Pin
Burner Base
Simmer Orifice
6. Remove the left screws holding the bezels for the left front
and right front gas valve knobs.
Remove Screws
Valve
Orifice
Burner Cap
Burner Ring
Locking Nut
Electrode
Main Orifice
– 27 –
7. Raise the cooktop front about 6" and disconnect the 6 pin
connector under the cooktop and behind the right front
valve.
8. Push the spark electrode wire through the holes in the
cooktop.
9. Pick the cooktop straight up and place in a safe area where
it will not be scratched or accidently knocked over.
10. To install the countertop, reverse the procedure 1 through 9.
B. To Access Burner Orifices:
Unscrew the orifice using an appropriately sized conventional
socket or nut driver. Use a piece of sticky tape in socket to
prevent the loose orifice from falling out.
Verify that the orifices in the kit match the chart sizes and
replace the orifices.
C. To Access Valve Orifices:
Using a small 1/8" flat-blade screwdriver, carefully remove the
valve orifices.
Replace each orifice with the marked orifice from the kit.
Ensure that the replaced orifice is firmly seated in the valve.
ORIFICE/JET SIZES – NATURAL
BURNER NATURAL GAS
MAIN SIM VALVE
(REAR) 1.59 mm 0.57 mm 0.71 mm
(FRONT) 1.45 mm 0.57 mm 0.71 mm 10.5k
(CENTER) 1.78 mm 0.61 mm 0.71 mm
ORIFICE/JET SIZES – LP
BURNER LP GAS
MAIN SIM VALVE
(REAR) 0.81 mm 0.34 mm 0.46 mm 8.5k
(FRONT) 0.81 mm 0.34 mm 0.46 mm 8.5k
(CENTER) 1.1 mm 0.37 mm 0.46 mm
*Simmer orifices are all brass because they are too small to color.
*ID code "letters" are stamped on orifice body.
BTU RATES
HI LO SIM
12k 2490 1200 RED "P"
2490 1200 ORANGE "P"
15k 3400 1200 YELLOW "V"
BTU RATES
HI LO SIM
2330 1100 WHITE "E"
2330 1100 WHITE "E"
15k 2440 1100 BLACK "G"