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 (copper) 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 compartment 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 during 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 BE- FORE 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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Middleby Marshall PS640 installation manual Connection, VII. GAS Supply
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PS640 specifications

The Middleby Marshall PS640 is an industry-leading conveyor oven designed to meet the demands of commercial kitchens, particularly in pizza and other high-volume food applications. This oven combines advanced technologies with robust design, ensuring that users achieve consistent, high-quality results while optimizing operational efficiency.

One of the standout features of the PS640 is its unique design, which includes a patented jet impingement technology. This technology significantly enhances the cooking efficiency by using high-velocity hot air to cook food evenly and quickly. This not only reduces cooking times but also helps retain moisture and flavor, resulting in a superior product that delights customers.

Another key characteristic of the PS640 is its dual-mode operation. The oven can be configured for either high-speed cooking or traditional baking modes, making it versatile enough to handle a wide variety of menu items. This flexibility allows operators to maximize their kitchen space and adapt to changing customer demands effortlessly.

The PS640 also boasts a fully insulated cooking chamber, which ensures consistent cooking temperatures and minimizes energy loss. This thermal efficiency not only contributes to food quality but also helps reduce operational costs, making it an economically viable option for restaurants and foodservice operations.

Further enhancing its user-friendliness, the PS640 features an intuitive digital control panel. This allows staff to easily set cooking times and temperatures, monitor performance, and make adjustments as necessary. Additionally, the oven includes programmable cooking settings, making it easy to replicate popular dishes quickly and ensuring consistency across multiple shifts.

Durability is another hallmark of the PS640. Constructed with high-quality materials, this oven is built to withstand the rigors of a busy kitchen environment. Its stainless-steel exterior not only gives it a sleek look but also makes it easy to clean and maintain.

In summary, the Middleby Marshall PS640 is a state-of-the-art conveyor oven that excels in speed, efficiency, and versatility. Its advanced technologies, user-friendly features, and robust construction make it an ideal choice for foodservice operators looking to elevate their cooking capabilities and enhance their menu offerings. Whether for quick-service restaurants, pizzerias, or catering operations, the PS640 delivers outstanding results with every use, ensuring satisfied customers and a thriving business.
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