Middleby Marshall P/N 60250 installation manual Connection, VII. GAS Supply

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Figure 2-17. Utility Connection Locations for Gas Ovens

Strain-relief

fitting

Electrical Junction Box (One per oven cavity)

Gas Inlet

(One per Single, Double,

or Triple Oven)

on the oven serial plate. The location of the serial plate is shown in Figure 1-1 (in Section 1, Description).

A fused disconnect switch or a main circuit breaker (customer furnished) MUST be installed in the electric supply line for each oven cavity. It is recommended that the switch/circuit breaker have Lockout/Tagout capability.

The supply conductors must be of the size and material (cop- per) recommended. Refer to the wiring diagram inside the machinery compartment of the oven. Electrical specifications are also listed on the oven’s serial plate and in Table 1-3, Electrical Specifications (in Section 1, Description).

The oven requires a ground connection to the oven ground screw. For gas ovens, the screw is located in the electrical junction box (see Figure 2-14). If necessary, have the electri- cian supply the ground wire. Do NOT use the wiring conduit or other piping for ground connections.

Incoming electrical power lines are fed through the strain-relief fitting, shown in Figure 2-14. The electrical supply connections are made inside the electrical junction box. The power lines then connect to the oven circuits through safety switches located inside the machinery compartment and each blower motor compartment. These switches interrupt electrical power to the oven when the Machinery Compartment Access Panel is opened, OR when the rear panel is removed.

Connection

Refer to the wiring diagram inside the machinery compart- ment of the oven to determine the correct connections for the electrical supply lines. Connect the supply as indicated on the wiring diagram.

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.

VII. GAS SUPPLY

CAUTION: DURING PRESSURE TESTING NOTE ONE OF

THE FOLLOWING:

1.The oven and its individual shutoff valve must be discon- nected from the gas supply piping system during any pressure testing of that system at test pressure in excess of ½ psi (3.45 kPa).

2.The oven must be isolated from the gas supply piping system by closing its individual manual shutoff valve dur- ing any pressure testing of the gas supply piping system at test pressure equal to or less than ½ psi (3.45 kPa).

3.If incoming pressure is over 14″ W.C. (35mbar), a separate regulator MUST be installed in the line BEFORE the individual shutoff valve for the oven.

WARNING: To prevent damage to the control valve regu- lator during initial turn-on of gas, it is very important to open the 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.

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 cavities: 750 cfh meter

•Three oven cavities: 1200 cfh meter

Gas Line

•DEDICATED LINE from the gas meter to the oven

•2″ (50.8mm) pipe for natural gas

•2″ (50.8mm) pipe for propane

•Maximum length: 2002 (61m). Each 90°elbow equals 7″ (2.13m) of pipe.

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P/N 60250 September 28, 2012

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Contents Owners Operating and Installation Manual Retain this Manual for Future Reference Middleby Marshall Table of Contents Conveyor Drive Motor Moves the conveyor Oven UsesTriple Ove Oven SpecificationsInstallation PS740 24″ Oven Installation Required Kits and Equipment Parts List for Series PS740 GAS Oven Installation KITKit PS740 Oven Installation Required Kits and Equipment Item no QTY Description 66159 ″-16 × 1 HEX SCREW, SST 3B. Model PS740 32 Double Oven Option Base with Legs and Top Quad Outrigger Weldment A27727 83 -16x1-1/4 HEX Bolt A21924 Requirements III. Ventilation SystemRecommendations Other ventilation concernsTop Panel and Base Pad Assembly IV. AssemblyStacking Restraint Cable InstallationDo not Overtighten the Conveyor Belt Conveyor InstallationSwitching Photo Detector Resetting Direction JumperConveyor Belt Reversal Reversing the Conveyor BeltVII. GAS Supply ConnectionConnection Adjusting the Maximum Pressure SettingGas Conversion PS740 Propane ConversionAdjusting the Minimum Pressure Setting MaintenanceCheckout Location and Description of Controls II. Normal Operation STEP-BY-STEP Screen Alerts III. Quick Reference TroubleshootingMaintenance Daily MaintenanceTop Row Bottom Row II. Maintenance MonthlySplit Belt Disassembly and Cleaning III. Maintenance Every 3 MonthsBlower Belt IV. Maintenance Every 6 MonthsKEY Spare Parts Available separately. See Figure KEY Spare Parts PS740 GASWiring Diagram 60250 September 28 60250 September 28 60250 September 28 Installing or servicing this equipment

P/N 60250 specifications

The Middleby Marshall P/N 60250 represents a significant advancement in commercial cooking technology, specifically designed to meet the rigorous demands of the foodservice industry. This piece of equipment stands out due to its combination of speed, efficiency, and superior cooking performance, making it an invaluable asset for restaurants, pizzerias, and other food establishments.

One of the main features of the P/N 60250 is its high-speed cooking capability. Utilizing the patented "TurboChef" technology, this oven can cook food items much faster than traditional convection ovens, which significantly reduces wait times and improves service efficiency. The unique airflow design ensures that food is cooked evenly, resulting in high-quality products that meet the expectations of discerning customers.

The P/N 60250 also boasts an array of customizable cooking modes that enable chefs to adapt the oven to a variety of menu items. With settings for baking, broiling, and convection cooking, operators can utilize this versatile unit for diverse applications, from crispy pizzas to perfectly baked pastries. This flexibility allows establishments to expand their menu offerings while maintaining consistent food quality.

Another key characteristic of the Middleby Marshall P/N 60250 is its energy efficiency. This unit is engineered to consume less energy compared to standard ovens, which not only benefits the environment but also helps reduce operational costs for foodservice operators. The intelligent energy management systems integrated into the oven optimize performance while minimizing energy waste.

The ease of use is another hallmark of the P/N 60250. With a user-friendly interface and programmable controls, staff can quickly learn how to operate the oven, reducing the training time required. The intuitive design allows for seamless transitions between different cooking modes and settings, enhancing workflow in fast-paced kitchen environments.

Furthermore, the construction of the Middleby Marshall P/N 60250 is robust and durable, designed to withstand the rigors of a commercial kitchen. The stainless steel exterior not only provides an attractive finish but also ensures easy cleaning and maintenance, a crucial feature for busy establishments.

In summary, the Middleby Marshall P/N 60250 exemplifies the blend of advanced technology and practical features necessary in modern foodservice operations. Its high-speed cooking capabilities, customizable settings, energy efficiency, ease of use, and durable construction make it an essential tool for any kitchen looking to elevate their culinary offerings while maximizing productivity.
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