12
ENGLISH
A. Gas Utility Rough-In Recommendations
The following gas system specifications are STRONGLY
RECOMMENDED. Deviating from these recommendations
may affect the baking performance of the oven.
Gas Meter
One or two oven cavities: 750 cfh meter
Three or four oven cavities: 1200 cfh meter
Gas Line
DEDICATED LINE from the gas meter to the oven
2-1/2" (63.5mm) pipe for natural gas
2" (50.8mm) pipe for propane
Maximum length: 200' (61m). Each 90° elbow equals 7'
(2.13m) of pipe.
B. Connection
Check the ovens gas supply requirements before making the
gas utility connection. Gas supply requirements are listed on
the ovens serial plate.
Check the serial plate to determine the type of gas (Propane or
Natural) to be used with the oven.
Refer to the instructions in the gas hose package (included in
the Installation Kit) before connecting the gas line. One gas line
connection method is shown in Figure 2-14; however,
compliance with the applicable standards and regulations is
mandatory.
Inlet, regulated, and pilot gas pressure readings can be taken
using a U tube manometer at the tap locations shown in
Figure 2-15.
NOTE
In the USA, the installation must conform with local codes, or in
the absence of local codes, with the National Fuel Gas Code,
ANSI Z223.1.
In Canada, the installation must conform with local codes, or in
the absence of local codes, with the Natural Gas Installation
Code, CAN/CGA-B 149.1, or the Propane Installation Code,
CAN/CGA-B 149.2, as applicable.
In Australia, the installation must conform with AGA Code
AG601 and with any requirements of the appropriate statutory
authority.
Certain safety code requirements exist for the installation of gas
ovens; refer to the beginning of this Section for a list of the
installation standards. In addition, because the oven is equipped
with casters, the gas line connection shall be made with a
connector that complies with the Standard for Connectors for
Movable Gas Appliances, ANSI Z21.69 (in U.S.A.), or, if appli-
cable, Connectors for Movable Gas Appliances, CAN/CGA-6.16
(in Canada), as well as a quick-disconnect device that complies
with the Standard for Quick-Disconnect Devices for Use With
Gas Fuel, ANSI Z21.41 (in U.S.A.), or, if applicable, Quick-
Disconnect Devices for Use With Gas Fuel, CAN1-6.9 (in
Canada).
C. Gas Conversion
Where permitted by local and national codes, it is possible to
convert ovens from natural to propane gas, or from propane to
natural gas. Use the appropriate Middleby Marshall Gas
Conversion Kit for the specific oven model.
CAUTION
The terms of the oven's warranty require all start-ups,
conversions and service work to be performed by a Middleby
Marshall Authorized Service Agent.
Figure 2-14 - Flexible Gas Hose Installation
To Gas
Supply Pipe
90°
Elbow
Union OR quick-
disconnect device
Flexible
Gas Hose
Full-Flow
Gas
Shutoff
Valve
90°
Elbow
Figure 2-15 - Gas Burner and Piping Assembly
Pilot pressure tap
(where pilot gas
pressure is
measured)
Combination Gas
Control Valve
(Safety Regulator)
Gas Burner
Burner
Blower
Inlet pressure
tap (where
incoming gas
pressure is
measured)
Manifold
pressure tap
(where manifold
gas pressure is
measured)
On/Off Knob
Always leave in
ON position
Manual
shutoff
valve
Gas line for
other oven
cavities
Cap for top
oven cavity
Nipple, 1-1/4
dia. X 3
(76mm) L, NPT
Elbow, 90°,
1-1/4 dia.
Modulating
gas valve
SECTION 2 - INSTALLATION
54"
(1372mm)
gas pipe
