Bosch NEZ1056 User Manual
CONVERSION INSTRUCTIONS
BOSCH NGT 73 (30”) and NGT 93 (36”) COOKTOP CONVERSION KIT FOR TRADITIONAL
MODELS NATURAL GAS (NG) TO PROPANE (LP) GAS
LP KIT (NEZ1056)
This kit is used to convert only NGT 73/93 sealed burner cooktops from natural gas operation to
propane gas operation. This kit cannot be used to convert other Bosch model sealed burner
cooktops (in particular NGP models), ranges or any other brand of cooktops.
PLEASE READ ENTIRE INSTRUCTIONS BEFORE PROCEEDING.
SAVE THE NATURAL GAS PARTS IN CASE CONVERSION FROM LP
BACK TO NATURAL GAS IS DESIRED. AN ADDITIONAL LP TO NATURAL
GAS CONVERSION KIT WILL ALSO BE REQUIRED.
!
This conversion kit shall be installed by a qualified
service agency in accordance with the
manufacturer’s instructions and all applicable
codes and requirements of the athority having jurisdiction. If the information in these instructions is
not followed exactly, a fire, explosion or production
of carbon monoxide may result causing property
damage, personal injury or loss of life. The qualified service agency is responsible for the proper
installation of this kit. The installation is not proper
and complete until the operation of the converted
appliance is checked as specified in the
manufacturer’s instructions supplied with the kit.
IMPORTANT: Only a qualified service technician or installer should make this conversion.
INSTALLER: Please leave these Installation Instructions with this unit for the owner.
OWNER: Please retain these instructions for future reference.
WARNING
1
CAUTION:
(1) When connecting the unit to
the propane gas make certain
the propane gas tank is
equipped with its own high pressure regulator. In addition, a
pressure regulator was supplied
with the cooktop. This second
regulator must be installed with
the cooktop. The maximum gas
pressure to this appliance is not
to exceed 14.0 inches water column from the propane gas tank
regulator.
The following must be met when
testing supply piping system:
Kit Contents:
Conversion Kit Instructions
Conversion Sticker
Foam Tape
5 LP Orifices (1-74/ 2-89/ 2-97)
5 Venturis (10.5 mm)
ORIFICE and VENTURI PACKAGE
TOP
BOTTOM
a) The appliance and its individual shut-off valve must be disconnected from the gas supply
piping system at test pressures
in excess of 1/2 psig (3.5 kPa).
b) 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
psig (3.5 kPa).
Tools Required:
7 mm Socket Driver w/ 3” extension
20 mm Socket or Wrench
Adjustable Wrench
Flat-head Screwdriver (small)
Main Orifices 4 Burner:
#97 - Front Left - 10,500 Btu/h
#89 - Rear Left - 8,500 Btu/h
#74 - Front Right - 5,800 Btu/h
#97 - Rear Right - 10,500 Btu/h
Main Orifices 5 Burner:
#97 - Front Left - 10,500 Btu/h
#89 - Rear Left - 8,500 Btu/h
#74 - Right Center - 5,800 Btu/h
#97 - Rear Center - 10,500 Btu/h
#89 - Rear Right - 8,500 Btu/h
2
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 REGULATOR 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 extension 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.
62
Figure 5
Bosch Cooktop Top View
(drawing not to scale)
BACK WALL
89
97
97
74
30”
89
36”
Figure 6
ORIFICE PACKAGE
TOP
BOTTOM
3
CONVERTING VALVES FOR PROPANE GAS
OFF
HI
LO
OFF
HI
LO
By-Pass Jet Location
manifold
The bypass jet on each valve must be adjusted as follows:
Place all knobs to “Off” position.
Remove KNOBS
Locate hole with by-pass screw as shown in Fig. 8.
Insert flat head screwdriver in hole and turn bypass screw
clockwise until “bottomed out”.
USE LOW TORQUE.
Replace knobs.
TEST TO ENSURE A SUCCESSFUL
CONVERSION
Check for flame characteristics: flame should be blue with
no yellow tip.
Figure 7
Models NGT 73 and NGT 93
Figure 8
Models NGT 73 and NGT 93
4
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