GE JGP989 Technical Service Manual page 9

reaches the desired size.
5. Perform a flame stability test with the downdraft
fan on HIGH.
Flame Adjustments
Note: The burners do not have air shutters adjust-
ments and use nonadjustable orifices. If the
flame lifts off the burner, or if you experience
yellow-tipped flames and/or soot in the flames,
be sure to check the following:
1. Gas pressure: 4-in. W.C.P. (natural) and 10-in.
W.C.P. (LP).
2. Inspect orifice to be sure it is drilled in the
center and free of debris or burrs.
3. Be sure the correct size orifice is in the proper
location.
4. Make sure the cooktop was properly converted
if on LP.
5. If the cause of sooting cannot be found in the
above checks, replace the orifice with one
having a smaller diameter opening.
Testing Flame Stability
1. With the downdraft vent fan on HI, turn the
burner knob from HI to LOW quickly. If the LOW
flame goes out, increase the flame size and
test again.
2. With the burner on the LOW setting, open and
close the cabinet door under the cooktop. If the
flame is extinguished by the air currents cre-
ated by the door movement, increase the flame
height and test again.
Flame Recheck
After the adjustment is made, turn all burners OFF.
Ignite each burner individually. Observe the flame
at the HI position. Rotate the valve to the LOW
position and be sure the flame size decreases as
the valve is rotated counterclockwise.
Note: Once the conversion is complete and
checked OK, fill out the LP sticker and include
your name, organization, and date conversion was
made. Apply the sticker near the cooktop gas inlet
opening to alert others in the future that this
appliance has been converted to LP. If converting
back to natural gas from LP, please remove the
sticker so others know the appliance is set to use
natural gas.
Converting Back to Natural Gas
Reverse the procedure for converting to LP,
locating the orifices as follows:
150
150
Natural Gas 4" W.C.P.
Burner Output Rating in BTU/HR
Location
LF, LR
RR
RF
Note: For operation at elevations above 5000 ft.
(1500 m), equipment ratings shall be reduced at a
rate of 2% for each 1000 ft. (300 m) above sea
level before selecting aproximately sized
equipment, ie., use smaller orifices.
– 7 –
Front
BTUs Orifice Size
9,100 1.50 Nmm
5,500 1.22 Nmm
11,500 1.69 Nmm
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