Bosch NEZ1056 Brief description

Brand: Bosch

Model: NEZ1056

Type: Brief description

This manual is also suitable for

NEZ1056/01

Bosch NEZ1056 is a conversion kit used to convert Bosch NGT 73/93 sealed burner cooktops from natural gas operation to propane gas operation. The kit includes 5 LP orifices, 5 venturis, a conversion sticker and foam tape. The conversion process involves converting the pressure regulator from 5” W.C. to 10” W.C., replacing the main orifices and venturis, converting the valves for propane gas, and testing to ensure a successful conversion. The kit is designed to be installed by a qualified service technician or installer.

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.

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.

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 ju-

risdiction. 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 quali-

fied 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.

WARNING

Tools Required:

7 mm Socket Driver w/ 3” extension

20 mm Socket or Wrench

Adjustable Wrench

Flat-head Screwdriver (small)

Kit Contents:

Conversion Kit Instructions

Conversion Sticker

Foam Tape

5 LP Orifices (1-74/ 2-89/ 2-97)

5 Venturis (10.5 mm)

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

ORIFICE and VENTURI PACKAGE

TOP

BOTTOM

CAUTION:

(1) When connecting the unit to

the propane gas make certain

the propane gas tank is

equipped with its own high pres-

sure 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 col-

umn from the propane gas tank

regulator.

The following must be met when

testing supply piping system:

a) The appliance and its indi-

vidual shut-off valve must be dis-

connected from the gas supply

piping system at test pressures

in excess of 1/2 psig (3.5 kPa).

b) The appliance must be iso-

lated from the gas supply piping

system by closing its individual

manual shut-off valve during any

pressure testing of the gas sup-

ply piping system at test pres-

sures equal to or less than 1/2

psig (3.5 kPa).

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.]

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.

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.

ORIFICE PACKAGE

TOP

BOTTOM

Figure 6

Bosch Cooktop Top View

(drawing not to scale)

30”

36”

BACK WALL

Figure 5

CONVERTING VALVES FOR PROPANE GAS

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

OFF

By-Pass Jet Location

manifold

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Bosch NEZ1056 Brief description

Brand: Bosch

Model: NEZ1056

Type: Brief description

This manual is also suitable for

NEZ1056/01

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Bosch NEZ1056 Brief description

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