Alto Shaam 10-10ML Gas Service Manual

INSTALLATION

SERVICE

AND

MAINTENANCE

W164 N9221 Water Street ●P.O. Box 450 ●Menomonee Falls, Wisconsin 53052-0450 ●U.S.A.

PHONE: [phone] [phone]

U.S.A./CANADA

●

FAX: [phone] [phone] U.S.A. [phone] INTL

www.alto-shaam.com

PRINTED IN USA

#6011ML•4/04

COMBINATION

OVEN/STEAMERS

COMBITHERM®

GGAASS

MMLL SSEERRIIEESS

®

COMBITHERM

FOUR/CONVECTION VAPEUR

6•10

ML, 7•14ML, 10•10ML,

10•20

ML, 12•18ML & 20•20ML GAS

ADVERTISSEMENT

Ne pas entreposer ni utiliser de l'essence ni d'autres
vapeurs ou liquides inflammables dans le voisinage de
cet appareil, ni de tout autre appareil.

ADVERTISSEMENT

Une installation, un ajustement, une altération, un
service ou un entretien non conforme aux normes peut
causer des dommages a'la propriété, des blessures ou la
mort. Lisez attentivement les directives d'installation,
d'opération et d'entretien avant de faire l'enstallation ou
l'entretiende cet équipement.

NOTE: En dernier reours, les instructions provenant

du fournisseur local de gas doivent être mises
en evidence de maniere a indiquer les
procedures à suivre au cas ou l'utilizateur
sentirait le gaz.

MIES EN GARDE

Les informations contenues dans ce manuel

sont importantes pour l'installation

l'utilisation et l'entretien de ce four. S'il

vous plait lisez-le tres attentivement et

conservez-le. La non-application de ces

consignes annule toutes garanties.

COMBITHERM GAS MODELS

6•10

ML,7•14ML,10•10ML,

10•20

ML,12•18ML & 20•20ML

SAFETY:

Do not store or use gasoline or other flammable vapors or
liquids in the vicinity of this or any other appliance.

WARNING:

Improper installation, adjustment, alteration, service or
maintenance can cause property damage, injury or
death. Read the installation, operating, and
maintenance instructions thoroughly before installing
or servicing this equipment.

NOTE: Instructions obtained from the local gas

supplier, indicating procedures to be
followed in the event that the user smells
gas, must be posted In a prominent
location.

The information contained in this manual is

important for the proper installation, use and

maintenance of this oven. Please read

carefully and retain for future reference.

Improper connection of this appliance

will nullify all warranties.

INSTALLATION, SERVICE AND

MAINTENANCE MANUAL

MANUEL D'INSTALLATION, DE MISE EN

ROUTE ET D'ENTRETIEN MODELES :

®

COMBITHERM

GAS

ALTO-SHAAM, INC.

®

P.O. BOX 450, W164 N9221 WATER STREET

MENOMONEE FALLS, WI 53052-0450, USA

MODEL SERIAL NO.

GAS TYPE MANIFOLD GAS PRESSURE IN. W.C.

INPUT RATE BTU/HR

ELECTRICAL: 110-120V, 60 Hz, 1 PH AMP WATTS

MINIMUM CLEARANCES FOR COMBUSTIBLE AND NON-COMBUSTIBLES

CONSTRUCTION: LEFT= 4 INCHES / RIGHT = 1 INCH / REAR = 1 INCH

FOR USE ONLY ON DOIT ETRE UTILISE SEULEMENT
NON-COMBUSTIBLE FLOORS SUR DES PLANCHERS INCOMBUSTIBLES

FOR INSTALLATION UNDER POUR UNE INSTALLATION SOUS UNE
VENTILATION HOOD ONLY HOTTE D'EVACUATION SEULEMENT

INTENDED FOR OTHER THAN DESTINE A UN USAGE AUTRE QUE
HOUSEHOLD USE DOMESTIQUE

ANSI/NSF4

ANS Z83.11-CSA 1.8-2002

The Alto-Shaam Gas
Combitherm oven/steamer
has a specification plate
affixed to the left-hand side
panel of the oven. The
plate includes electrical and
gas connection
specifications and should
be reviewed prior to
service.

Contact the factory if any

servicing assistance is

required. Remember to

provide the model number

and serial number of the

oven which can be found on

on this oven nameplate.

®

COMBITHERM

GAS

1.0 INSTALLATION

1.1 Receiving & Transportation . . . . . . .1

1.2 Basic Installation Site Requirements . . .1

1.3 Ventilation Requirements . . . . . . . . .2

1.4 Positioning On Site . . . . . . . . . . . . .2

1.5 Installation Codes & Standards . . . .2

1.6 Installation Requirements . . . . . . . .3

1.7 Air Supply Requirements . . . . . . . . .4

1.8 Assembly Requirements . . . . . . . . . .4

1.8.1 Exhaust Gas Flue Diverter . . . .4

1.8.2 Sound Absorber . . . . . . . . . . . .4

1.8.3 Hand Shower Holder . . . . . . . .4

1.8.4 Drip Tray . . . . . . . . . . . . . . . . .4

1.8.5 Roll-In Cart (TROLLEY) Guide Rails . . . .5

1.9 Electrical Connection . . . . . . . . . . . .5

1.10 Water Supply . . . . . . . . . . . . . . . . . .6

1.11 Water Drainage . . . . . . . . . . . . . . . .6

1.12 Gas Connection Requirements . . . . .7

1.13 Gas Type and Pressure . . . . . . . . . . .7

1.14 Gas Connection . . . . . . . . . . . . . . . .7

1.15 Leak Testing . . . . . . . . . . . . . . . . . .8

1.16 Fuel Interlock System . . . . . . . . . . .8

1.17 Gas Exhaust . . . . . . . . . . . . . . . . . . .8

1.18 Gas Pressure Chart . . . . . . . . . . . . .9

1.19 Gas Flame Patterns . . . . . . . . . . . . .9

1.20 Burner Pilot Adjustment . . . . . . . .10

1.20.1 Checking Pressure . . . . . . . . .10

1.20.2 Adjust Pilot Burner . . . . . . . .10

1.20.3 Manifold Pressure Adjustment . . .10

1.20.4 Ignition & Burner Check . . . . .10

1.20.5 Verify Sequence of Operation . . . .10

1.21 Sequence of Operation . . . . . . . . . .11

1.22 Stacking Combitherm Connections .12

1.23 Post Installation Check List . . . . . .13

1.24 Emergency Operation . . . . . . . . . . .14

2.0 CONTROL PANEL IDENTIFICATION . . .15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.1 Safety Precautions . . . . . . . . . . . . .17

2.2 Preventive Maintenance . . . . . . . . .18

2.3 Routine Cleaning Requirements . . .18

2.4 DAILY CLEANING

2.4.1 Cleaning Instructions . . . . . . .19

2.4.2 Automatic Cleaning Program .20

2.5 MONTHLY CLEANING

2.5.1 Water Intake Filter Cleaning . . . .21

2.5.2 Drain Pipe Cleaning . . . . . . . . . . .21

2.5.3 Flue Outlet Cleaning . . . . . . . . . .21

2.5.4 Fan Cleaning . . . . . . . . . . . . . . . . .22

2.6 Roll-In Cart/Food Trolley Cleaning . .23

2.7 Daily Gasket Cleaning . . . . . . . . . .23

3.0 SERVICE SECTION

3.1 Combitherm Service Record . . . . . .24

3.2 Combitherm Gas

3.2.1 Exterior Component Identification . . 25

3.2.2 Operating Schematic . . . . . . . .25

3.2.3 Plumbing System . . . . . . . . . .25

3.3 Service Views — LEFT-SIDE PANEL

Models 6•10, 7•14, 10•10, 10•20, 12.18 . . . .26

Motor Contactor & Protection Switches . . . .27

3.4 Service Views— LEFT-SIDE PANEL

Model 20•20 . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Motor Contactor & Protection Switches . . . .29

3.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . .30

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

3.6 Combitherm Gas Parts List . . . . . . . . . . . . . .32

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . .35-36

Transportation & Damage Claims . . . .37

Limited Warranty . . . . . . . . . . . . . . . .37

TABLE OF CONTENTS

COMBITHERM® GAS INSTALLATION

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.1

1.1 RECEIVING & TRANSPORTATION

Upon receipt of the Combitherm combination oven/ steamer,
check the exterior of the shipping carton for any physical
damage that could result in damage to the contents. If the
oven was not received from the carrier in an upright position,
there is a stronger possibility of concealed damage. Remove
the carton or uncrate the unit carefully and inspect for any
transit damage. Immediately report any damage to the
delivering freight carrier.

The oven must remain on the pallet while
being moved to the installation site by fork
lift or pallet lift truck

.

Note the
dimensions
required for
doorways
and aisles
for access of
the oven and
pallet to the

installation
site.Transport the oven in an upright and level position
only. Do not tilt the oven.

With the oven on the original
pallet, remove the carton and all
packaging materials. Open the
oven door and remove all
documents and other materials
from the oven interior. Remove
the roll-in cart if so equipped.

®

MODEL

6•10MLGAS

10•10MLGAS

7•14MLGAS

10•20MLGAS

12•18MLGAS

20•20MLGAS

WIDTH

42" (1067mm)

42" (1067mm)

45" (1143mm)

51" (1295mm)

51" (1295mm)

58" (1473mm)

DEPTH

35" (889mm)

35" (889mm)

51" (1295mm)

49" (1245mm)

49" (1245mm)

44" (1118mm)

HEIGHT W /PALLET

42" (1067mm)

48" (1219mm)

68" (1727mm)

65" (1651mm)

65" (1651mm)

85" (2159mm)

A

T

T

E

N

T

IO

N

A

T

T

E

N

T

IO

N

PALLETIZED DIMENSIONS

1.2 BASIC INSTALLATION SITE REQUIREMENTS

HOOD INSTALLATION IS REQUIRED

• Installation surface must be level.

• Do not install adjacent to flammable surfaces.

• Deep fat fryers or similar heat producing equipment must not be installed in

the immediate vicinity of the hand shower.

• The installation surface

must be non-combustible (unable to burn).

The oven must remain on the pallet while being moved

to the installation site with fork lift or pallet lift truck.

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.2

1.3 VENTILATION REQUIREMENTS

A steam ventilation hood is mandatory for the operation of the oven. The ventilation hood must be installed
in accordance with local building codes for steam exhaust and must protrude 12-inches to 20-inches
(300mm to 500mm) over the front side of the oven. A grease filter must be located in the protruding area of
the hood. Grease filters should be thoroughly cleaned on a regular basis following manufacturer's
instructions. Ventilation hoods must ensure an adequate amount of incoming air during operation and must
be operated whenever the combination oven/steamer is used in order to avoid the accumulation of
condensation in the hood area. See the section titled Gas Exhaust.

1.4 POSITIONING ON SITE

Lift the oven from the pallet with a fork
lift or pallet lift truck positioned at the
front of the oven. For damage protection,
the use of two wooden boards, placed
between the bottom of the oven and the
lifting forks, is strongly recommended.

Stand the oven in a level position. Use the
adjustable feet to overcome an uneven
floor and ensure that the unit is level.

It is strongly recommended that table top
models be mounted on a factory supplied
stand or a stand that is stable, open, level,
and non-combustible. Recommended height
is 23-inches (584mm).

Adjust the height of floor models for
smooth access of the trolley or cart.
Ensure that the unit is level, right-to-left
and back-to-front. When positioning the
oven, observe the minimum space allocation
requirements shown.

To insure proper operation, the installation of this oven must be completed
by qualified technicians in accordance with the instructions provided in
this manual. Failure to follow the instructions provided may result in
damage to the oven, building, or cause personal injury to personnel.

1.5 INSTALLATION CODES & STANDARDS

The following codes and standards are required for installation of this oven:

AIR SUPPLY, ELECTRICAL CONNECTIONS, WATER CONNECTIONS,

GAS CONNECTIONS, GAS EXHAUST, AND WASTE WATER DISCHARGE.

Installation must comply with local codes required for gas appliances. In the absence of local

codes, installation must comply with the National Fuel Gas Code, ANSI Z223.1 (latest

edition). In Canada, the appropriate code is the Natural Gas Installation Code,
CAN/CGA-B149.1 or the Propane Installation Code, CAN/CGA-B. Adherence to code by a qualified installer
is essential for the following: Gas Plumbing, Gas Appliance Installation, Commercial Cooking Ventilation,
Water and Plumbing, and OSHA Regulations. The installation surface must be heat resistant and non­combustible (unable to burn). See your local codes or the National Fuel Gas Code for the definition of
combustible and non-combustible construction.

COMBITHERM® GAS INSTALLATION

MODEL

6•10MLGAS

10•10MLGAS

7•14MLGAS

10•20MLGAS

12•18MLGAS

20•20MLGAS

NET WEIGHT

377 lb (171 kg)

490 lb (222 kg)

528 lb (239 kg)

573 lb (260 kg)

666 lb (302 kg)

838 lb (380 kg)

OBSERVE ATTENTION LABEL

ON OVEN FOR

AREA TO AVOID

WITH LIFTING FORK

.

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.3

1.6 INSTALLATION REQUIREMENTS

The installation surface must be

non-combustible (unable to burn).

➡➡

➡➡ Do not install oven adjacent to flammable surfaces.

Strictly observe all local fire safety regulations.

➡➡

➡➡ In order to ensure proper ventilation, a minimum

distance of at least 6-inches (152mm) must be kept
from the control panel side [LEFT] of the oven and
any adjoining surfaces.

In addition to ventilation requirements,
additional clearance is needed for service access.
A minimum distance of 18-inches (457mm)
is strongly recommended. If adequate service
clearance is not provided, it will be necessary to
disconnect the gas, water, and drain to move the
oven with a fork lift for service access. Charges
in connection with inadequate service access is
not covered under warranty.

➡➡

➡➡ Allow a minimum of 4-inches (102mm) from the

right side of the oven to allow the door to open to
at least a 90° angle. Fully opened, the door will
extend up to a 225° angle. If the oven is furnished
with the retractable door option, allow a minimum
clearance of 6-1/2-inches (16cm).

➡➡

➡➡ Allow a minimum clearance of 4-inches (102mm)

from the back of the oven for plumbing connections.

➡➡

➡➡ Allow a 20-inch (50cm) clearance at the top of the

oven for free air movement and for the steam
vent(s) located at the top [RIGHT-REAR].

➡➡

➡➡ Do not install the oven adjacent to heat producing

equipment such as fryers, broilers, etc. Heat from such
appliances may cause damage to the controls of the
Combitherm. Minimum clearance recommended:
20-inches (50cm).

Place the Combitherm oven on a stable, LEVEL
horizontal surface. For counter-top models, the oven
stand must be level. In addition, the overall height of
the oven should be positioned so the operating
controls and shelves may be conveniently reached
from the front.

ALL INSTALLATION INSTRUCTIONS

AND REQUIREMENTS MUST BE

STRICTLY OBSERVED.

IMPROPER CONNECTION

OF THIS APPLIANCE

NULLIFIES ALL WARRANTIES.

COMBITHERM® GAS INSTALLATION

18"

(46cm)

4"

(102mm)

4" (102mm)

RETRACTABLE
DOOR OPTION:

6-1/2" (165mm)

20"
(50cm)

MINIMUM

20"

(50cm)

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.4

1.7 AIR SUPPLY REQUIREMENTS

Installation of this oven must include a provision
for an adequate flow of fresh air for gas combustion.
This requirement must be observed by the installer
as well as the operator. The bottom of the oven
provides air supply access for gas combustion and
must be kept clear at all times.

OPERATOR

CAUTION

Make certain the area around
the bottom of the oven is kept
clear of obstructions to allow a
continuous supply of fresh air
for gas combustion.

Make certain the oven installation maintains
adequate air ventilation to provide
cooling for electrical and gas
components. The area
around the oven
should be
clear of any
obstructions
which might
retard the flow
of cooling air.
Failure to
observe this
caution may
result in damage
to the control
components and will
void the warranty.

OPERATOR

CAUTION

Do not use circulating fans on
the floor. Floor fans will cause
the loss of pilot flame and will
affect burner operation.

Local and the National Fuel Gas Code provide rules
for determining the amount of fresh air necessary
for combustion and ventilation of commercial
cooking appliances. The codes will help determine
if additional outside air may be necessary to meet
health and safety regulations.

1.8 ASSEMBLY REQUIREMENTS

1.8.1 EXHAUST GAS
FLUE DIVERTER

Install the diverter as
shown on the drawing.
Make certain the wire
screen is in place before
attaching with the
screws provided with
the diverter.

1.8.2 SOUND ABSORBER

Screw the sound absorber
on the threaded nipple
located at the top of the
oven on the back, left­hand side.

1.8.3 HAND SHOWER HOLDER

Fasten the hand shower holder in the holes
provided on the oven using the three (3) screws
packaged with the holder.

1.8.4 DRIP TRAY

Hang the drip
tray at the front
of the oven as
indicated on
the drawing.

COMBITHERM® GAS INSTALLATION

FRONT

OF OVEN

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.5

COMBITHERM® GAS INSTALLATION

1.8 ASSEMBLY REQUIREMENTS

1.8.5 ROLL-IN CART (TROLLEY) GUIDE RAILS

(ON CART EQUIPPED MODELS)

Mount REAR SUPPORT  on the bottom of the oven
toward the back. Fasten each end of the

REAR SUPPORT

with a WASHER, LOCK WASHER, and BOLT  . Align each

GUIDE RAIL  with the slotted holes located at the

front of the REAR SUPPORT. Loosely fasten each GUIDE

RAIL

from the back of the REAR SUPPORT with a WASHER,

LOCK WASHER, and NUT  .

Do not tighten GUIDE RAIL fasteners. Attach the front
end of each GUIDE RAIL to the oven base with a

WASHER, LOCK WASHER, and BOLT  .

Push the roll-in cart (trolley) into the oven, center
the cart right-to-left, and close the oven door. From
the rear of the oven, slide both guide rails toward
the center of the oven until they make contact with
the roll-in cart. Lock the

GUIDE RAILS into position by

tightening both

NUTS  at the back of the REAR

SUPPORT

. At the front of the oven, make certain

contact has been made between the oven and the
cart along the total width of the oven to create a
complete seal. When a full seal has been determined,
recheck each connection to make certain it has been
fully tightened.

1.9 ELECTRICAL CONNECTION

Ensure the power supply matches the electrical
specification located on the oven data plate. Gas
models shipped within the United States and Canada
are typically rated 110-120V, 60Hz, 1Ph and include
an electrical cord. Fuses are located behind the left
side panel.

Installation of electrical connections and wiring must
be made by a

licensed electrical contractor. The oven
must be electrically grounded in accordance with local
codes, or in the absence of local codes, with the
National Electrical Code, ANSI/NFPA 70 (latest
edition). In Canada, electrical connections must
comply with the Canadian Electrical Code, CSA C22.1.

ACCESSING CONTROL AREA
Access the electrical control system through the left
side panel of the oven.

MAKE CERTAIN TO DISCONNECT POWER AND

ENSURE THE GAS SUPPLY IS SHUT OFF

BEFORE REMOVING THE LEFT SIDE PANEL.

An electrical diagram is affixed inside the left-hand
side control area. A copy of the electrical diagram is
also located at the back of this manual. Service or
changes must be done by a licensed electrical
contractor and in accordance with local codes
and regulations.

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.6

1.10 WATER SUPPLY

CONNECT TO POTABLE (DRINKABLE) COLD WATER ONLY

COMBITHERM® GAS INSTALLATION

WATER PRESSURE REQUIREMENTS:

MINIMUM 30 PSI (2 BAR)

MAXIMUM 90 PSI (6 BAR)
Flush the water line at the installation site before
connecting the oven to the water supply. A shut-off
valve and approved back-flow preventer must be
installed when connecting the oven to the cold water

intake. The water supply line must be a minimum of
3/4-inch (NPT) (19mm). A hose connector is supplied
for flexible hose connection to the COLD water source.
A water filtration system is recommended if the water
supply is between 7 and 9 grains of hardness. If water
tests over 14 grains of hardness, the installation of a
water softener is strongly recommended.

THE SHUT-OFF VALVE MUST BE IN THE OPEN POSITION

WHEN THE OVEN IS BEING USED.

PIPE SEALING TAPE (

TEFLON®) MUST

BE USED AT ALL CONNECTION POINTS.

The use of a pipe sealing compound is not recommended.

The hand shower spray hose is installed adjacent
to the cold water intake connection. A ball valve
is installed on the oven for hose connection to
the COLD water source. Assemble the washer
and the flexible hose on the ball valve and hang the
spray handle on the holder previously installed
on the oven.

The oven must discharge through an indirect waste
pipe by means of an air gap. The drain thread is
1-1/4-inch (32mm) NPT. A union is required. Install
a 1-1/4-inch (32mm) diameter drain line. The drain
line must always be a positive gradient away from
the oven and not more than 12-inches (305mm)
before an air gap.

NOTE: In the U.S.A., this equipment is to be

installed to comply with the Basic Plumbing
Code of the Building Officials and Code
Administrators International, Inc. [BOCA],
and the Food Service Sanitation Manual of
the Food & Drug Administration [FDA].

If several units are to be connected to one drain pipe,
the dimensions of the pipe must be sufficient to allow
an unobstructed water drain system.

AVERAGE DRAIN WATER TEMPERATURE

149°F (65°C)

NOTE: Install with the use of

the elbow and
washers provided
with the gas
Combitherm oven.

1.11 WATER DRAINAGE

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.7

COMBITHERM® GAS INSTALLATION

1.13 GAS TYPE AND PRESSURE

1.14 GAS CONNECTION

1.12 GAS CONNECTION REQUIREMENTS

Installation of this oven must be completed by a qualified installer familiar with the local codes and
regulations governing the installation of commercial gas appliances.

Installation must be in accordance with local codes, and in the absence of local codes, with the National Fuel
Gas Code ANSI Z223.1 (latest edition). In Canada, the appropriate code is the Natural Gas Installation Code,
CAN/CGA-B149.1 or the Propane Installation Code, CAN/CGA-B.

Check the oven nameplate information to determine
if the oven was manufactured for use with natural or
propane gas. Make certain the gas supply matches
the nameplate information.

Check the oven nameplate to determine the gas
manifold pressure for the oven. The minimum
supply pressure to the oven must exceed this value
by at least 1" w.c. It is recommended that the supply
pressure be between 5" w.c. and 14" w.c. for natural
gas, and 11" w.c. and 14" w.c. for propane.

An alternate gas supply inlet may be required
for installation sites with elevations at 3,000
feet (914m) above sea level. Please check
with the factory.

Should conversion to the opposite fuel be desired,

conversion parts must be ordered from the factory.

Conversion must be completed by a qualified service
person only.

Always remember to reflect the

conversion on the oven's nameplate.

The minimum size requirement for gas piping or a
flexible connector is

3

/

4

- inch (19mm). For long runs

of gas piping, the pipe diameter must conform to the
tables in the National Fuel Gas Code, ANSI/NFPA
Z223.1.

A listed gas shut-off valve must be installed
upstream of the appliance to shut off the gas supply
during servicing. The shut-off valve should be
accessible with the appliance in the normal
installation position.

If the oven or the oven stand is supplied with casters,
gas connection must be made with a flexible
connector that complies with the Standard for
Connectors for Movable Gas Appliances, ANSI
Z21.69; or in Canada, Connectors for Movable Gas
Appliances, CAN/CGA-6.16-M87. When using a
flexible connector, a quick disconnect device must be
used to comply with the Standard for Quick­Disconnect Devices for Gas Fuels, ANSI Z21.41; or in
Canada, Quick Disconnect Devices for Use with Gas
Fuels, CAN1-6.9.

When a quick disconnect device and flexible
connector are used, a restraining device must be
installed to limit the movement of the appliance and
prevent damage to the connector or quick disconnect.
An example of a restraining device would consist of
a 2000 pound test, stainless steel cable, attached to a
structural member of the kitchen wall behind the
oven. The means of attachment should consist of a
quick connect snap so that the oven can be
disconnected when the appliance must be moved
away from the wall.

The other end of the cable should be permanently
attached to the rear frame of the oven. The cable
should be of sufficient length so that no strain is ever
placed on the flexible gas connector in the event of
accidental movement of the oven without properly
disconnecting the gas connector. The flexible
connector should be routed to form a downward "U"
loop between the building gas supply and the
permanent attachment at the rear of the oven.

The routing of the flexible connector must not be
made under the oven. Oven temperatures achieved
during operation are too hot for safe operation. Gas
piping should be installed from the point of gas
connection at the bottom, front of the oven to the
back of the oven where the flexible connector may
be safely used. See the illustration for the
recommended placement.

CAUTION

OVERHEATING

DANGER

Gas piping
must never

be installed

to run under

the burner.

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.8

If a pressure leak test above 1/2 psi is to be
performed on the building supply gas piping, the
shut-off gas valve and oven inlet gas supply line
must be disconnected from the building supply
piping before conducting the pressure test. Failure
to do so may result in damage to the manual gas
valve, gas components in the oven, or both.

If any gas leak tests are to be conducted at pressures
equal to or below 1/2 psi, the manual gas shut-off
valve upstream of the oven must be turned off before
conducting the tests.

Leak testing of the internal oven piping system was
conducted before shipping the oven from the factory.
If additional testing is needed, it should only be
conducted at normal gas supply pressures. If the
testing is performed using combustible gas in the
piping, the leak checking should be done with a soap
solution (bubble checking).

The use of an electronic combustible gas leak detector
is helpful, however, this type of detector can be
oversensitive. Electronic detectors may indicate false
leaks from other sources which would not be detected
when checking with a liquid solution to verify a
no-hazard gas connection.

NEVER CHECK FOR LEAKS

USING AN OPEN FLAME.

When starting the oven after initial installation, the
gas lines must be free of air. It may take up to 30
minutes to eliminate all air from the lines. If, after
this time there is no pilot, call for factory assistance.

1.15 LEAK TESTING

1.17 GAS EXHAUST

COMBITHERM® GAS INSTALLATION

The oven is not designed for direct connection to a chimney vent
system or for direct connection to a horizontal exhaust system.

The oven must be installed under a ventilation hood listed to
ANSI/UL 705 (latest edition), and the installation must be
completed in accordance with the ANSI/NFPA 96-1987,
Standard for Ventilation Control and Fire Protection of
Commercial Cooking Operations.

The oven is supplied with a flue diverter which must be installed
on the oven prior to installation.

See Assembly Requirements

toward the front of this manual.

Oven operators should be instructed with regard to the

hazards of placing any material on top of the oven that

would obstruct the flow of flue products out the

opening of the flue diverter. Operators should also

be instructed with regard to the hazards of hot flue
gases and that any material or items placed on top of, or in front
of the flue defector could be damaged or cause a fire hazard.

1.16 FUEL INTERLOCK SYSTEM

Local codes may require the fuel supply to the oven be interlocked to the ventilation hood. If that is the case,

a separate, electrically operated gas valve must be installed in the gas line. Valve selection is at the discretion

of the installer, however, the valve must be recognized by the authority which has jurisdiction.

COMBITHERM GAS INSTALLATION AND MAINTENANCE MANUAL — 6011ML

PG.9

1.19 GAS FLAME PATTERNS

When starting the oven after initial installation, the gas lines must be free of air. It may take up to 30 minutes
to eliminate all air from the lines. If, after this time there is no pilot, call for factory assistance.

After the installation is complete, the oven must be test fired to
ensure that the system is operating properly. Follow the operating
instructions located in the cooking guide furnished with the oven.
Under most circumstances, initial operation will be the only
installer check necessary.

The flame pattern under both hot and cold conditions should be
stable on all burner ports. There should be no lifting or blowing
after 15 seconds of operation. Gas Combitherm ovens are not
equipped with air shutter adjustment on the burners. If the flame
pattern does not match correct pattern shown, contact the factory
for further directions.

Make certain the electric igniter lights the pilot burner quickly. The
main burner should light within 4 seconds, without problems and
should light smoothly with no harsh noise. When the oven is COLD,
cycle the oven ON and OFF five times to verify proper operation.
Allow the oven to heat for 5 minutes and repeat the process.

Check the flame pattern on the burners. The flames should be blue
in color with little or no yellow in the flame. Some yellow tipping
is normal with propane gas models, however, there should be no
indication any yellow tipping will produce soot on the combustion
chamber walls, pilot, or main burner.

COMBITHERM® GAS INSTALLATION

1.18 GAS PRESSURE CHART

The gas valve, pilot burner and nozzles for the main burner have been fitted according to the gas
type specified on the name plate. Technical specifications for the gas system are as follows:

Combitherm 6•10 7•14 10•10 10•20 20•20

ML Gas Model 12•18

Natural Gas

Connected pressure rating 7 in. W.C. 7 in. W.C. 7 in. W.C. 7 in. W.C. 7 in. W.C.

Min. connected pressure 5 in. W.C. 5 in. W.C. 5 in. W.C. 5 in. W.C. 5 in. W.C.

Max. connected pressure 14 in. W.C. 14 in. W.C. 14 in. W.C. 14 in. W.C. 14 in. W.C.

Nozzle pilot burner —————

Nozzle burner 220 315 280 400 400

Manifold pressure 3.5 in. W.C. 3.5 in. W.C. 3.5 in. W.C. 3.5 in. W.C. 3.5 in. W.C.

Gas Consumption 45 cu.ft/hr 81.9 cu.ft/hr 67 cu.ft/hr 112 cu.ft/hr 168.1 cu.ft/hr

Gross thermal output 45,500 Btu/hr 82,000 Btu/hr 68,000 Btu/hr 113,000 Btu/hr 170,000 Btu/hr

Propane Gas

Connected pressure rating 11 in. W.C. 11 in. W.C. 11 in. W.C. 11 in. W.C. 11 in. W.C.

Min. connected pressure 11 in. W.C. 11 in. W.C. 11 in. W.C. 11 in. W.C. 11 in. W.C.

Max. connected pressure 14 in. W.C. 14 in. W.C. 14 in. W.C. 14 in. W.C. 14 in. W.C.

Nozzle pilot burner

—————

Nozzle burner 135 190 170 220 220

Manifold pressure 10 in. W.C. 10 in. W.C. 10 in. W.C. 10 in. W.C. 10 in. W.C.

Gas Consumption 17.7 cu.ft/hr 32.9 cu.ft/hr 26.5 cu.ft/hr 44.1 cu.ft/hr 66.5 cu.ft/hr

Gross thermal output 45,500 Btu/hr 82,000 Btu/hr 68,000 Btu/hr 113,000 Btu/hr 170,000 Btu/hr