Bosch NGT 73 Conversion Instructions page 3

CAUTION:
TURN OFF GAS AND ELECTRICITY
Shut off the outside propane tank gas valve to
the cooktop, and
Remove cooktop power cord from electrical
outlet or turn breaker off at breaker box, and
Turn all control knobs to the "OFF" position.
CONVERT PRESSURE REGULA-
TOR FROM
5" W.C. TO 10" W.C.
Remove the hexagon cap from the top of the
regulator with an adjustable wrench.
Pop out the plastic stem in the cap and turn it
over pressing it firmly in place so that the
letters "LP" can now be seen upright in the
stem, rather than "NAT".
Replace the cap and button assembly into the
top of the regulator sealing it firmly. Make
certain spring is still in place. DO NOT OVER
TORQUE.
Install the FOIL CONVERSION STICKER next
to the rating plate, located on the bottom
corner of the rough-in box.
[Note: arrrow on back part of regulator needs
to point in the direction of gas flow to the
cooktop.]
REPLACE MAIN ORIFICES and
VENTURIS
REMOVE GRATES, BURNER CAPS, VENTURI
NUTS (with a 20 mm socket or an adjustable
wrench). Maintop does not require removal.
REMOVE MAIN ORIFICES.
Note: The Bosch NGT Cooktop models contain
7mm orifices (4 in the 30" and 5 in the 36"). A
method of retaining main orifices in the socket
during extraction and insertion is to apply a
piece of foam tape to the socket (see Fig.3).
Insert the socket driver with 3" minimum exten-
sion into the jet holders to remove existing
orifices, as shown in Fig 4.
ASSEMBLE NEW ORIFICES in place on the
cooktop exactly as layed out in the orifice
package card as shown in Figures 5 and 6.
Place the new orifices into the socket one at a
time (the tape will keep them in place), then
insert each orifice into its threaded hole in jet
holders. USE LOW TORQUE.
REPLACE OLD VENTURI NUTS (9.0 mm) with
NEW venturi nuts (10.5 MM) (with a 20 mm
socket or an adjustable wrench). USE LOW
TORQUE.
Figure 5
Bosch Cooktop Top View
(drawing not to scale)
BACK WALL
97 89
89
97 74
30" 36"
Figure 6
ORIFICE PACKAGE
TOP
BOTTOM
3