Middleby Marshall Oven User Manual

SECTION 2

INSTALLATION

I. UNLOADING/UNPACKING

Your Middleby Marshall Ovens are shipped partially assembled.
Each oven section will arrive in its own crate of the following
size and weight:

PS360U/PS360L PS360WB-U/PS360WB-L

Length: 72 (183cm) 66 (167cm)
Width: 48 (122cm) 57 (144cm)
Height: 60 (152cm) 50 (127cm)
Weight: 1675 lbs. (760kg) 1750 lbs. (780kg)

If you ordered stands for your ovens, they are shipped in
separate crates.

When your common carrier or truck line notifies you of delivery,
you must have a forklift at the facility to unload the crate(s).

If you have a door that is wider than the ovens, simply move the
ovens into your facility and set up an appointment with your
Middleby Marshall Authorized Installer.

SECTION 2

INSTALLATION

NOTE: The width of each oven can be reduced by about 1"
(25mm) by removing the window from the oven. Window
disassembly instructions are in the Cleaning section of this
Owners Manual.

If the ovens are wider than your door opening, the oven will
have to be dismantled according to the directions in the Pre­Installation Procedures Manual.

NOTE

There must be adequate clearance

between the oven and combustible con-

struction. Clearance must also be pro-

vided for servicing and for

operation.

WARNING

Do not obstruct the flow of combustion

and ventilation air to and from your

oven. There must be no obstructions

around or underneath the oven.

WARNING

This oven must be installed in accordance

with the rules in force. Use only in a

well ventilated area. Read the

instructions before use.

2-1

SECTION 2
INSTALLATION

II. INSTALLATION, PREPARATION, AND

SUPPLY

When preparing the oven for installation at a location, the latest
International, National or Local Requirements should be
adhered to.

The ovens must be installed on an even (level) non-flammable
flooring and any adjacent walls must be non-flammable. The
minimum allowed distance from the rear of the oven to the wall
is 12 (30cm).

The ovens can be supported only by legs. No casters are
allowed. It should be made certain that there are no obstructions
located around or underneath the oven that interfere with air
circulation.

The ovens must be installed under a ventilating hood with
electrical exhaust air sensing control.

The gas supply connection should be according to applicable
ISO-228-1 or ISO-7-1 recommendations.

Normally, the oven is preparted and adjusted to the specific
gas type used by the customer. Before operating the oven,
check the label on the oven and also on the packaging that the
gas type indicated matches the local supply at the installation.
If not, refer to Section VI, PREPARATION FOR VARIOUS
GASES, in this chapter and convert as directed.

18"

458mm

All installations, conversions and service work must be
performed by an Authorized Service Agent according to the
instructions supplied by the manufacturer.

When converting from one gas type to a different type, the
orifices supplied with the conversion kit must be checked for
proper size as specified in this manual to assure that the oven
is operating at the nominal rated input.

2"

51mm

Minimum

18"

458mm

12"

305mm

3”

76mm

Figure 2-1 - Ventilation Hood Dimensions (RECOMMENDATIONS ONLY)

2-2

III. VENTILATION SYSTEM

IMPORTANT

Where international, national, or local codes require

the installation of fire suppression equipment or other

supplementary equipment, DO NOT mount the

equipment directly to the oven.

MOUNTING SUCH EQUIPMENT ON THE OVEN MAY:

 VOID AGENCY CERTIFICATIONS
 RESTRICT SERVICE ACCESS
 LEAD TO INCREASED SERVICE EXPENSES FOR

THE OWNER

REQUIREMENTS

A mechanically driven ventilation system is required for the
oven.

PROPER VENTILATION OF THE OVEN IS THE
RESPONSIBILITY OF THE OWNER.

RECOMMENDATIONS

NOTE THAT THE HOOD DIMENSIONS SHOWN IN FIG­URE 2-1 (PREVIOUS PAGE) ARE
ONLY. INTERNATIONAL, NATIONAL, AND LOCAL
CODES WILL VARY, AND MUST BE FOLLOWED WHEN
INSTALLING THE VENTILATION SYSTEM. ANY AP­PLICABLE INTERNATIONAL, NATIONAL, AND LOCAL
CODES SUPERSEDE THE RECOMMENDATIONS
SHOWN IN THIS MANUAL.

The rate of air flow exhausted through the ventilation system
may vary depending on the oven configuration and hood
design. Consult the hood manufacturer or ventilation engineer
for these specifications.

To avoid a negative pressure condition in the kitchen area,
return air must be brought back to replenish the air that was
exhausted. A negative pressure in the kitchen can cause heat­related problems to the oven components as if there were no
ventilation at all. The best method of supplying return air is
through the heating, ventilation and air conditioning (HVAC)
system. Through the HVAC system, the air can be temperature­controlled for summer and winter. Return air can also be
brought in directly from outside the building, but detrimental
affects can result from extreme seasonal hot and cold
temperatures from the outdoors.

NOTE: Return air from the mechanically driven system
not blow at opening of bake chamber. Poor oven baking
performance will result.

RECOMMENDATIONS

must

SECTION 2

INSTALLATION

OTHER VENTILATION CONCERNS

 Special locations, conditions, or problems may require the

services of a ventilation engineer or specialist.
 Inadequate ventilation can inhibit oven performance.
 It is recommended that the ventilation system and duct

work be checked at prevailing intervals as specified by the

hood manufacturer and/or HVAC engineer or specialist.

2-3

SECTION 2
INSTALLATION

Figure 2-2 - INSTALLATION KIT

PS360L/WB-L Tandem

PS360/WB Double Tandem

PS360U/WB-U Tri Tandem

Item Part # Description PS360U/WB-U Quad Tandem

1 22361-0001 Flexible Gas Hose 2 4 3 4

2 22450-0028 Adjustable Legs 8 8 12 16

3 30773 Flue Vent, 14"Lg. 2 - - -

4 30759 Flue Vent, 29-1/2"Lg. - 2 3 4

5 30758 Flue Vent, 50" Lg. - 2 - -

6 21256-0008 Screw, 10-32 x 3/8 A/R A/R A/R A/R

8 42400-0089 Master Link Kit, PS360

8 42400-0598 Master Link Kit, PS360WB

9 35122-0049 Attachment Strip - 4 - -

10 35000-1103 Stop, End Conv., PS360

10 35000-1899 Stop, End Conv., PS360WB

11 21292-0001 Scr, #2PT 10-16 x 3/4 Hx Wsh A/R A/R A/R A/R

12 33984 Thermocouple 2 4 3 4

13 27276-0001 Cable Clamp 2 4 3 4

14 1002040 Warranty,Parts & Serv. Dist.List 1 1 1 1

15 38615 Owners Manual,English 1 1 1 1

16 27126-0238 11 Piece Hex Key Set 1 1 1 1

17 31389 Silicone Tubing, 36 (914mm) L x

5/16 (8mm) ID x 7/16 (11mm) OD 2 4 3 4

2434

12 --

- 35000-1454

- 35000-1456 Front Gasket Spacer 2 4 4 4

- 35000-1457 Rear Gasket Spacer 2 4 4 4

- 37200-0013

- 37000-0696 Transition Floor Panel - - - 1

- 48009-0024 Transition Top Panel - - - 1

- 48009-0025 Transition Side Wall - - - 2

- 35000-1748 Transition Rear Support - - - 1

- 35000-1749 Transition Front Support - - - 2

- 37000-0697 Transition Top Support Channel - - - 2

Machinery Compartment Trim Strip

Baking Chamber Gasket and Frame

1222

1222

2-4

2”

51mm

SECTION 2

INSTALLATION

Figure 2-3

Dimensions and Data: PS360L Tandem

3

45"

1143mm

45-1/2"

1156mm

42"

1067mm

1016mm

31-1/2"
800mm

40"

17-3/4"
451mm

2”

51mm

32”

4

144-1/2"
3670mm

109"

2769mm

17-3/4"
451mm

6-1/2"

165mm

4

42-3/4"

1086mm

813mm

27-1/4"
692mm

54-1/2"

1384mm

27-1/4"
692mm

2

1

10-1/2”
267mm

2

1

6”

152mm

11-1/2"
292mm

16-1/2"
419mm

Figure 2-4

Dimensions and Data: PS360WB-L Tandem

3

53"

1346mm

45-1/2"

1156mm

50"

1270mm

1219mm

31-1/2"
800mm

48"

17-3/4"
451mm

40”

1016mm

4

144-1/2"
3670mm

109"

2769mm

17-3/4"

451mm

6-1/2"

165mm

4

50-3/4”

1289mm

27-1/4"
692mm

54-1/2"

1384mm

27-1/4"
692mm

2

1

10-1/2”
267mm

2

1

6”

152mm

11-1/2"
292mm

16-1/2"
419mm

2-5

SECTION 2
INSTALLATION

2”

51mm

Figure 2-5

Dimensions and Data: PS360 Double Tandem

3

45"

1143mm

81-1/2"

2070mm

42"

1067mm

52"

1321mm

1016mm

31-1/2"
800mm

40"

17-3/4"

451mm

32”

4

144-1/2"

109"

2769mm

3670mm

17-3/4"

451mm

6-1/2"

165mm

4

813mm

34"

864mm

27-1/4"
692mm

54-1/2"

1384mm

27-1/4"
692mm

1

2

2

1

5-27/32"

148mm

10-1/8"

258mm

1

2

2

1

6-1/4"

158mm

13

11-1/2"
292mm

11-1/2"

292mm

16-1/2"
419mm

Figure 2-6

Dimensions and Data: PS360WB Double Tandem

2-6

2-7

Figure 2-7

Dimensions and Data: PS360U Tri Tandem

INSTALLATION

SECTION 2

2-8

Figure 2-8

Dimensions and Data: PS360WB-U Tri Tandem

SECTION 2

INSTALLATION

2-9

Figure 2-9

Dimensions and Data: PS360U Quad Tandem

INSTALLATION

SECTION 2

2-10

Figure 2-10

Dimensions and Data: PS360WB-U Quad Tandem

SECTION 2

INSTALLATION

Figure 2-11

Thermocouple Installation Locations

SECTION 2

INSTALLATION

IV.

THERMOCOUPLE
INSTALLATION

1. Install the thermocouple
sensing bulb into the correct
hole in rear of bake chamber as
shown in Figure 2-11.

2. Thread thermocouple lead
through grommet and into the
machinery compartment.

3. Remove the right-side ac­cess panel of the machinery
compartment.

Thread the thermocouple lead
through the side of the machin­ery compartment as shown in
Figure 2-12, and into the elec­trical box (at the right-front of
the machinery compartment).

Figure 2-12

Placing the Thermocouple Leads

2-11

SECTION 2
INSTALLATION

4. Connect the thermocouple
leads to the temperature con­troller as shown in Figure
2-13.

5. Repeat Steps 1-4 for each
of the other ovens in the in­stallation.

8 = White = Positive

7 = Red = Negative

R = No Connection

8
7
6
5

4
L2
L1

9
10
11
12
13

14
15
16

Figure 2-13

Thermocouple Lead Connections

2-12

V. ASSEMBLY

If the installation includes upper ovens mounted atop lower
ovens, the ovens must be stacked before joining the tandem
ovens together.

If the installation includes ovens that are to be mounted on
stands, assemble the ovens to the stands before joining the
ovens together. An exploded view of the stand is shown in
Figure 2-14.

SECTION 2

INSTALLATION

Figure 2-14

Exploded View - Upper Oven Stand

2-13

SECTION 2
INSTALLATION

JOINING THE OVEN BODIES

For TANDEM and DOUBLE TANDEM installations, perform
Steps 1-7 to join the ovens.

For TRI TANDEM installations, perform Steps 1-7 to join two of
the ovens together, and ensure that they are level; then, repeat
Steps 1-7 to join the third oven to the two that are assembled.

For QUAD TANDEM installations, perform Steps 1-7 for EACH
PAIR of ovens, producing two sets of two joined ovens. Do not
assemble the center bridge section at this time.

1. Determine the proper position of the ovens by referring to
Figure 2-15. Then, move the ovens to their approximate
final locations.

NOTE: The Sealing Gasket Assembly is shown attached
to the left oven in Figure 2-15, but may be pre-mounted to
EITHER of the two ovens.

LEFT OVEN RIGHT OVEN

Sealing gasket
assembly (pre-

mounted)

Alignment

plate

Slot for

alignment

plate

Figure 2-15

Oven Positioning and Alignment

2. Remove the rear axial cooling
fans that are adjacent to the
mating sides of the ovens, as
shown in the diagram. Leave
the fan wiring connected to
the oven.

Mating surface of

ovens (shown

from lower rear)

Wiring is still

Figure 2-16

Cooling Fan Removal

2-14

connected

3. Insert three of the supplied
1/2 x 5 bolts through the
holes in the frame of the right
oven, pointing outward as
shown in Figure 2-17. Then,
slide the spacers into place
on the bolts.

SECTION 2

INSTALLATION

2-1/2 x 2-1/2

( 64 x 64mm)

spacers

Bolts

2-1/2 x 8

(64 x 203mm)

spacers

4. Push the ovens together.
Check that the mounting
bolts, alignment plate, and
sealing gasket are properly
aligned.

Figure 2-17

Bolts and Spacers

Figure 2-18

Aligning the Ovens for Assembly

2-15

SECTION 2
INSTALLATION

5. Check the alignment of
the track rails using a
straightedge. The rails
MUST BE LEVEL across
the gap between the
ovens. If necessary,
adjust the oven legs to
align the track rails.

Figure 2-19

Checking Track Rail Alignment

6. Tighten all of the attaching bolts. Check that the mating
edges of the ovens align properly. If gaps appear between
the tops of the ovens, it will be necessary to loosen the
connecting bolts and realign the ovens.

IMPORTANT: If it is necessary to realign the ovens,
remember to re-check the alignment of the track rails.

7. Attach the front trim strip
between the two ovens, as
shown in Figure 2-20.

Trim strip

Figure 2-20

Trim Strip Positioning

8. Perform one of the following, as appropriate:

 For PS360/360WB Tandem and Double Tandem

installations, skip ahead to the INSTALLING THE
CONVEYOR FRAME AND BELT section (Page 2-19).

 For PS360/360WB Tri Tandem installations, perform

Steps 1-7 again to attach the third oven to the two that
have just been assembled. Then, skip ahead to the

INSTALLING THE CONVEYOR FRAME AND BELT

section (Page 2-19).

 For PS360/360WB Quad Tandem installations, perform

Steps 1-7 again to attach the two remaining ovens to
each other. Then, continue on to Step 9 to attach the
center (transition) section.

2-16

9. Test-fit the transition
section of the conveyor
frame, as shown in Figure
2-21. The alignment pins
on the bottom of the frame
ensure correct spacing of
the center ovens.

SECTION 2

INSTALLATION

Figure 2-21

Transition

Frame Placement

10. Attach the two angled support
brackets between the two
center ovens, as shown in
Figures 2-22a and 2-22b.

Note that a LOWER OVEN
(PS360L, PS360WB-L) uses
different support brackets for
the front and rear, while an
UPPER OVEN (PS360U,
PS360WB-U) uses identical
brackets on the front and rear.

Figure 2-22a

Support Brackets -

Lower Oven

Conveyor frame
shown removed

for clarity

Figure 2-22b

Support Brackets -

Upper Oven

2-17

SECTION 2
INSTALLATION

10. Remove the transition section of the conveyor frame.
Place the transition floor panel into place atop the support
brackets. See Figure 2-23.

Figure 2-23

Installing the Transition

Floor Panel

11. Replace the transition (center) conveyor section, as shown
in Figure 2-24.

Figure 2-24

Replacing the

Transition Frame

2-18

For a TANDEM or DOUBLE
TANDEM oven, slide the conveyor
frame assembly into either end of
the oven.

INSTALLING THE CONVEYOR FRAME AND BELT

ALL TYPES OF OVENS, ENSURE THAT THE DRIVE

FOR
SECTION/END OF THE CONVEYOR FRAME IS PLACED ON
THE SAME END OF THE OVEN AS THE CONVEYOR DRIVE
MOTOR.

1. Insert the conveyor frame into the oven as follows:

Figure 2-25a

Installing the Conveyor Frame-

Tandem and Double Tandem Ovens

SECTION 2

INSTALLATION

For TRI TANDEM ovens, slide
one center section and one end
section of the frame into EACH
END of the oven. The four sections
should butt against each other.

For QUAD TANDEM ovens, slide
two intermediate sections and one
end section of the frame into EACH
END of the oven. Butt the two
inner intermediate
sections against the
transition (center) frame
section. The other
frame sections should
butt against each other.

Figure 2-25b

Installing the Conveyor Frame-

Tri Tandem Ovens

Figure 2-25c

Installing the Conveyor Frame-

Quad Tandem Ovens

2-19

SECTION 2
INSTALLATION

2. Slide the conveyor belt
through the support rods
underneath the frame, and
thread it through the oven.
Then, reach through the oven
window and pull the free end
of the belt through the oven
so that it lies atop the
conveyor frame.

Check that the links on the
conveyor are oriented as
shown in Figure 2-26.

Direction

of travel

Figure 2-26

Conveyor Link Orientation

3. Connect the inside master
links. Check that the links
are oriented as shown in
Figure 2-27.

4. Connect the outside master
links. Note that the outside
master links have right and
left sides. The right-side
master link has an open hook
facing you, as shown in
Figure 2-28.

Incorrect

position

Direction

of travel

Correct

position

Figure 2-27

Inside Master Links

Figure 2-28

Outside Master Links

2-20

5. For a TANDEM, DOUBLE TANDEM, or TRI TANDEM
oven installation, skip ahead to the next section. For a
QUAD TANDEM oven installation, continue on to Step 6.

SECTION 2

INSTALLATION

6. Slide the top transition panel
into place. Then, slide the
two transition side panels into
place. See Figure 2-29.

7. If the four latches are not
already attached to the side
and top transition panels,
attach them in place as shown
in Figure 2-29.

Fasten the latches on the side
and top panels to hold the
panels in place.

8. LOOSELY attach the
conveyor drive motor to the
end wall of the oven, as
shown in Figure 2-30.

Latches

Figure 2-29

Transition
Assembly

Latches

9. Assemble the conveyor drive
chain in place on the motor
and conveyor drive
sprockets.

10. Position the motor to adjust
the tension of the drive chain.
The deflection of the chain
should not exceed 1/4
(6mm). Then, tighten the
motor in place.

Figure 2-30

Conveyor Motor and Drive Chain Assembly

11. Assemble the end plugs and motor housing onto the oven.

TANDEM AND DOUBLE TANDEM OVENS ONLY:
Assemble the conveyor crumb trays and conveyor
extension covers onto the oven.

2-21

SECTION 2

6

6

4

5

2

2

3

3

1

5

INSTALLATION

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

CAUTION

IT IS REQUIRED THAT THE OVEN BE

PLACED UNDER A VENTILATION

HOOD FOR ADEQUATE AIR SUPPLY

AND VENTILATION.

GAS SUPPLY

&

ELECTRICAL SUPPLY

PROVIDED BY CUSTOMER

DO NOT USE CONDUIT

FOR GROUND

CIRCUIT BREAKER

1 circuit breaker/fused disconnect switch with
lockout/tagout is required for each oven

cavity. Wire each oven cavity separately.

ELECTRICAL SPECIFICATIONS

220-230V, 1 Ph, 8 Amp draw, 50 Hz, 2 pole, 3
wire system per oven cavity (2 hot, 1 grd).

GAS RATING

Models PS360U/L: 135,000 BTU/HR,
34,020kcal/HR, 40kW/HR
Models PS360WB-U/-L: 170,000 BTU/HR,
42,840kcal/HR, 50kW/HR

MINIMUM GAS METER RATING

600 Ft.3/Hour (17m3h) for 1 or 2 oven cavities.
1200 Ft.3/Hour (34m3h) for 3 or 4 oven cavities.

Minimum rating does not take other gas
appliances into consideration. Gas
consumption varies at each site. Total
BTU/HR (kcal/hr) must be calculated on high
flame off of each appliance to determine if
meter needs to be larger.

MINIMUM GAS PIPE SIZE

Natural: 2" (51mm) ID for 1 or 2 oven cavities

with runs up to 200 ft.(61m).

2-1/2" (64mm) ID for 3 or 4 oven cavities with
runs up to 200 ft.(61m)

Runs over 200 ft. consult factory

Propane: 1-1/2" (38mm) ID for 1 or 2 oven

cavities with runs up to 200 ft.(61m).

2" (51mm) ID for 3 or 4 oven cavities with runs
up to 200 ft.(61m).

Runs over 200 ft. consult factory

OR

Must be a dedicated line.

OR

Must be a dedicated line.

GAS OVEN ROUGH-IN

To

Oven

To

Oven

To

Oven

GAS VALVES

3/4" (19mm) ID full flow gas shut-off valve.
A separate connection and valve must be provided for each oven.

REQUIRED SUPPLY GAS PRESSURE

Natural: 20-30mbar
Propane: 50mbar

SUGGESTED

If space permits, service should be located to the left of the ovens to
allow access to switches and valves.

User Supplied Items:

ITEM DESCRIPTION

1 2"(51mm) X 2"(51mm) X 3/4"(19mm) TEE
2 3/4"(19mm) X 3"(76mm) NIPPLE
3 3/4" (19mm)FULLFLOW GAS SHUT-OFF VALVE
4 2"(51mm) X 3/4"(19mm) 90° REDUCER ELBOW
5 2"(51mm) ID GAS SUPPLY PIPE LINE-NATURAL GAS
6 15 AMP TOGGLE SWITCH - 2 POLE for GAS

To

Oven

Figure 2-31

Oven Rough-In

2-22

VI. ELECTRICAL CONNECTION

Check the oven data plate before making any electric supply
connections. Electric supply connections must agree with data
on the oven data plate. A typical oven data plate is shown in
Figure 2-34 (on Page 2-24).

NOTE: When the oven is installed, it must be electrically
grounded in accordance with current IEC/CEE requirements
and also with local codes.

The electrical installation, including the service connection,
must comply with current IEC/CEE requirements and to local
codes. The installation must undergo a complete electrical
check before operating the oven.

Special attention must be given to the polarity of the supply
when connecting to oven input terminals.

All connections are made at one common connection at the
back of each oven. Refer to Figures 2-32 and 2-33.

NOTE: At the installation location, it is required that the
electrical supply for each oven incorporates a main circuit
breaker (not furnished). The circuit breaker must have 3mm
contact gaps breaking all poles of the supply.

SECTION 2

INSTALLATION

WARNING: If your electrical supply has fast-acting circuit
breakers, then the initial starting current of the blower motors
in Model PS360WB-U and PS360WB-L may trip the breakers.
It is suggested to use slow-acting circuit breakers with these
models.

For further electrical information, refer to the wiring diagram.

WARNING: The connections to the exhaust system, electrical
supply, and gas supply must follow the installation instructions.
Initial start-up of the oven can be performed only by an
authorized agent.

Figure 2-32

Junction Connection Box (Lower Oven)

Figure 2-33

Junction Connection Box (Upper Oven)

3/4 (19mm) pipe for gas

oven connection

3/4 (19mm) pipe for gas oven connection

2-23

SECTION 2
INSTALLATION

Figure 2-34

Typical Oven Data Plate - Models PS360/PS360WB

2-24

VII.

GAS SUPPLY FOR GAS HEATED OVENS

Pipe sizing -- Always install a shut off valve in the gas supply
line to the oven. This valve should be the same size as the
supply line.

Please remember that the longer the pipe runs, the more the
pressure drops. One 90° elbow equals a 1,2 m length of pipe.

Each oven section requires a nominal gas input as follows:

PS360U,L (per oven) 40 kW
PS360WB-U, -L (per oven) 50 kW

Follow the recommended pipe sizing and meter sizing as
indicated in the Rough-in Drawing (Figure 2-31,Page 2-22).

The flexible hose furnished with the oven must be positioned
as shown in Figure 2-35.

NOTE: The recommended pipe sizes are larger than usually
required to eliminate any operation problems. It is much less
expensive to make the initial installation large enough to do the
job rather than redoing the job later.

For lighting instructions, refer to Step-by-Step Operation in the
OPERATION Section of this manual.

SECTION 2

INSTALLATION

WARNING:

To prevent damage to control
valve regulator during initial
turn on of gas, it is
important to open manual
shutoff valve very slowly.

After the initial gas turn on, the
manual shutoff valve must
remain open except during
pressure testing as outlined in
the above steps or when
necessary during service
maintenance.

very

CAUTION

DURING PRESSURE TESTING NOTE ONE OF THE
FOLLOWING:

1. The oven and its individual shutoff valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressure in
excess of 1/2 psig (3.45 kPA).

2. The oven must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
system at test pressure equal to or less than 1/2 psig (3.45
kPA).

3. If the incoming pressure is over 50 mbars, a separate
regulator must be installed before the 3/4 manual gas
shutoff valve located at the rear outside of the oven.

To Gas

Supply Pipe

Appliance
Connection/
Male Nipple

90° ST

Elbow

Union

Full-Flow Gas

Shutoff Valve

Flexible Hose

Correct Position

Figure 2-35

Flexible Hose Connector Installation

2-25

SECTION 2
INSTALLATION

VIII. PREPARATION FOR VARIOUS GASES

Before proceeding to set up the oven for a specific gas, the
main gas supply valve and the electrical supply circuit breaker
should be turned off.

When preparing the oven for use of Group H or L Natural gases,
the orifice (Manifold) pressure should be adjusted to the values
shown in the chart on Page 1-1.

The main orifice and also the by-pass (low flame) orifice should
be changed for the specific gas type used as shown in the
following Table, also refer to Section IX, CHANGING ORIFICES.

FOR USE WITH NATURAL GAS

The input to the burner can be determined using the orifice
(manifold) pressure data or by the volume supplied using the
gas meter.

Using the orifice pressure data you must know the specific gas
quality used and when using the volume method you must
know the heat value (HuB) of the gas used (Obtainable from
your local gas supplier).

If you used the orifice pressure method, you should double
check the rated input using the volume method.

If the measured input does not correspond with the rated input,
check first that correct orifices are installed. If the orifice sizes
are as specified, check and correct the supply and orifice
pressures to obtain the correct input based on the gas meter
reading.

FOR USE WITH LIQUID (LP) GAS

When using liquid gas the converter in the multifunction gas
valve has to be turned end over end - 180° (Refer to Figure 2-

36). This takes the governor out of operation.

2-26

IT ...... II

GB .... II

FR .... II

DE .... II

DE .... II

ES .... II

NL ..... II

BE .... I

IT ...... II

GB .... II

FR .... II

DE .... II

ES .... II

NL ..... II

BE .... I

...................

2H3+

...................

2H3+

.................

2E+3+

2ELL3B/P

2ELL3B/P

...................

2H3+

................

2L3B/P

.......................

2E+

...................

2H3+

...................

2H3+

.................

2E+3+

2ELL3B/P

...................

2H3+

................

2L3B/P

.........................

3+

GAS TYPE AND PRESSURE LABEL

Predisposto per gas metano .................................................... 20 mbar

Adjusted for natural gas ........................................................... 20 mbar

Essaye au gaz naturel (E/L) ................................................ 20-25 mbar

Eingestellt auf Erdgas (E) ........................................................ 20 mbar

...........

Eingestellt auf Erdgas (LL) ....................................................... 20 mbar

...........

Preparado para gas natural...................................................... 20 mbar

Aangelegd op aardgas ............................................................. 25 mbar

Essaye au gaz naturel/aangelo op aardgas ........................ 20-25 mbar

GAS TYPE AND PRESSURE LABEL

Predisposto per G.P.L. ................................................... 28-30/37 mbar

Adjusted for L.P.G. ......................................................... 28-30/37 mbar

Essaye au gaz naturel liquide ........................................ 28-30/37 mbar

Eingestellt auf Flüssiggas ........................................................ 50 mbar

...........

Preparado para gas liquido ............................................ 28-30/37 mbar

Aangelegd op vloeibaar gas ..................................................... 30 mbar

Aangelegd op vloeibaar gas/essaye au gaz liquide ....... 28-30/37 mbar

SECTION 2

INSTALLATION

Insert Converter In this

Position for Pressure

Regulation

Outlet Pressure Tap

Governor Adjustment

Gas Converter

Insert Converter In this

Position for use with LP

Gas

Burner Blower

Air Adjustment

PlateBurner

High Flame

Solenoid Valve

Main Orifice

1/2 Nuts

Inlet Pressure Tap

1/2 Compression Nut

3/4 Union

Pilot Line

Combination

Gas Control

Valve

Figure 2-36

Burner/Piping Assembly

2-27

Low Flame

Bypass Orifice

Low Flame

Bypass Line

SECTION 2
INSTALLATION

IX. CHANGING ORIFICES

TO CHANGE MAIN ORIFICE (Refer to Figure 2-36)

1. Turn off main gas supply valve.

2. Open 3/4" union in gas supply line.

3. Remove 1/2" nuts securing gas train to the burner housing.

4. Using a 11/16" wrench remove orifice from the mounting
flange.

5. Install new orifice in reverse order.

WARNING

Before operating oven check for gas leaks!

TO CHANGE BYPASS (LOW FLAME) ORIFICE (Refer to
Figure 2-36)

1. Turn off main gas supply valve.

2. Open 3/4" union in gas supply line.

3. With 1/2" wrench loosen compression nuts securing bypass
tube to solenoid valve.

4. Remove orifice from bypass tube.

5. Install new orifice in reverse order.

X. VOLUMETRIC METHOD

WARNING

Before operating oven check for gas leaks!

IMPORTANT

During these measurements, no other gas appliance should be
in operation being supplied from the same gas meter.

To determine gas flow setting value E:
E = Liters/min.

NB = Rated input in kW
HuB = Heat (Calorific) value of gas in kW/m

E = NB

HuB

3

To determine the time of 0.1m

Time in minutes =100

E

The time of the gas flow through the meter should be taken
with a stopwatch.

1. Remove cover screw from the gas valve pressure (governor)

adjustment valve.

2. Open main gas supply valve and start oven according to

supplied instructions with the temperature control at
maximum setting.

3. Once oven is in operation, adjust pressure valve (governor)

to the calculated volume using the time for 100 liters of flow
through. Turning the adjustment screw clockwise will
increase the flow and counter-clockwise will reduce it.

(100 liters) gas usage:

3

2-28

4. Replace cover screw on adjustment valve and turn off main
gas supply valve.

5. Record the reading obtained from the gas meter and
calculate obtained gas flow. Compare this to the indicated
flow in the CHART OF ORIFICE SIZES, GAS PRESSURES,
NOMINAL INPUT RATINGS AND GAS FLOW on Page 1.

6. Note the following comments and procedures to assure
correct gas supply pressure and adjusting the gas valve to
obtain proper orifice (manifold) pressure.

XI. VARIATIONS OF RATED SUPPLY

PRESSURES

Special attention should be given to the supply pressure and
gas flow pressure at the supply connection to the oven. The
nominal supply pressure for gas family Group 2 (natural gas)
should be 20 mbar.

If the supply pressure is lower or higher than the rated (nominal)
pressure then the reason should be investigated and the gas
supplier contacted.

If the supply pressure is lower than 17 mbars or higher than 25
mbars then the oven should be shut down and the gas supplier
notified. No adjustment of the oven controls should be made
and the oven should not be operated.

SECTION 2

INSTALLATION

TO CHECK GAS SUPPLY PRESSURE:

1. Close main gas supply valve.

2. Remove supply (inlet) pressure measuring stud screw from

gas valve and attach the manometer to the stud.

3. Open main gas supply valve and restart oven with

temperature control at maximum setting.

4. Measure inlet (supply) pressure. For all natural gases this

should be between 17 and 25 mbars.

5. Turn oven off, close main gas supply valve, remove

manometer from stud and tighten cover screw in to pressure
measuring stud.

ORIFICE (MANIFOLD) PRESSURE METHOD:

1. Turn off main gas supply valve.

2. Remove pressure measuring stud screw located at the

out-flow (closest to gas burner) of the gas valve and attach
a manometer.

3. Remove cover screw from the gas valve pressure (governor)

adjustment valve.

4. Open main gas supply valve and start oven according to

supplied instructions with the temperature control at
maximum setting.

5. Once oven is in operation, adjust pressure valve (governor)

to the orifice pressure value as shown for the specific gas
in the Gas Specifications Table.

6. Turn oven off, close main gas supply valve, remove U tube

manometer and tighten cover screw into pressure measuring
stud.

2-29

SECTION 2
INSTALLATION

SPECIAL NOTICES:

The ovens should be operated only in an area that has good air
circulation.

The oven must be installed under an electrically powered
ventilating hood.

Installation of replacement parts requiring access to the interior
of the oven is permitted only by authorized service personnel.

The operator should be properly trained to the functioning of
the oven.

This instructions manual should be supplied to the operator.

Constructional changes to the area where the oven is installed
shall not affect the air supply to the oven.

The installation, start-up and changes required when changing
from one gas type to another can be performed only by a
certified professional.

These ovens are intended only for commercial use and are to
be operated only by professionals.

It is required that the oven is regularly inspected for proper
functioning. The frequency of inspections are dependent on
the oven usage, however it should be performed at least once
a year.

After adjustments or service work the oven has to be checked
for gas leaks.

NOTE: After conversions, readjustments or service work the
oven has to be tested for proper functioning. Basically the
following applies:

 Testing for gas leaks,
 Testing for correct air supply, specifically to the burner

blower,
 Testing of proper combustion and gas supply,
 Testing of correct gas supply controls,
 Testing the flue gas escape from the oven,
 Testing the vent system of the installation location.

2-30