Middleby Marshall PS840 Series installation manual Connection, VII. GAS Supply

Page 21

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.

17

Page 20 Page 22
Image 21
Page 20 Page 22
Contents Owners Operating and Installation Manual Retain this Manual for Future Reference Middleby Marshall Table of Contents Oven Uses DescriptionTriple Ove Oven SpecificationsInstallation PS840 24″ Oven Installation Required Kits and Equipment Parts List for Series PS840 GAS Oven Installation KITKit Kit 15 ″ Legs Casters& Top Casters & Top PS840 32″ Oven Installation Required Kits and EquipmentItem no QTY Description Hard Ware BA G ″-16 × 1 HEX SCREW, SST Item no QTY Description Quad Outrigger Weldment Item no QTY Description 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 PS840 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 PS840 GASWiring Diagram Page Page

PS840 Series specifications

The Middleby Marshall PS840 Series is a high-performance conveyor oven designed to deliver outstanding cooking results with efficiency and speed. This series is renowned in the foodservice industry for its advanced technology and user-friendly design, making it an ideal choice for restaurants, pizza shops, and other commercial kitchens that require consistent high-quality food production.

One of the standout features of the PS840 Series is its innovative design that utilizes a patented Cookstar Technology. This technology promotes even cooking by ensuring that hot air circulates consistently throughout the oven chamber. The result is perfectly baked pizzas, evenly cooked dishes, and enhanced flavor, making it a favorite among chefs and kitchen staff alike.

The PS840 offers a variable-speed conveyor system that allows users to adjust cooking times according to the specific requirements of different food items. This flexibility enables operators to achieve precise results, whether they are baking thin-crust pizzas or roasting vegetables. Additionally, the oven reaches optimal cooking temperatures quickly, minimizing wait times during peak service hours.

Energy efficiency is another key characteristic of the Middleby Marshall PS840 Series. Built with high-quality insulation and advanced heating elements, this series is designed to significantly reduce energy consumption while maintaining performance. This not only lowers operational costs but also supports sustainable practices in the foodservice industry.

The PS840 Series includes a user-friendly digital control panel that makes it easy for operators to set cooking times and temperatures, monitor performance, and switch between cooking modes. This intuitive interface reduces the learning curve for new staff and enhances overall productivity in busy kitchens.

Another notable feature of the PS840 Series is its durability. Constructed with robust materials, this oven is designed to withstand the wear and tear of a commercial kitchen environment. Its easy-to-clean surfaces and removable conveyor belt further enhance its maintenance convenience, allowing kitchens to maintain high hygiene standards with ease.

In summary, the Middleby Marshall PS840 Series stands out in the market for its exceptional cooking performance, energy efficiency, user-friendly controls, and robust design. These features make it a versatile and reliable choice for any establishment looking to enhance their food production capabilities while delivering quality dishes consistently. Whether utilized for baking, roasting, or reheating, the PS840 Series excels in meeting the demands of the modern foodservice industry.
Top Page Image Contents