Middleby Marshall PS520G installation manual Gas Control Valve

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SECTION 2

INSTALLATION

1.Checking the Gas Supply (Inlet) Pressure

a. With the main gas supply valve closed and the circuit

breaker/fused disconnect in the OFF (“O”) position, open

the inlet pressure tap shown in Figure 2-13 and attach a

manometer to the tap.

b.Volumetric Method

1.Determine the time of 0.1m3 (100 liters) of gas usage as follows.

b. Depress the safety switches to allow the oven to operate.

Consumption (m3/hr.) =

NB (Rated input in kW)

c.

Open the main gas supply valve. Switch the circuit breaker/

 

fused disconnect to the ON (“I”) position.

d.

Start the oven according to the directions in the Operation

 

section of this Manual. Adjust the temperature controller to

 

the maximum setting 600°F (316°C).

e.

Measure the supply (inlet) pressure.

f.

Switch the oven off. Close the main gas supply valve, and

 

switch the circuit breaker/fused disconnect to the OFF (“O”)

 

position. Remove the manometer, and close the inlet tap.

g.

Compare the measured supply (inlet) pressure to the

 

nominal pressures shown in the Description section of

 

this Manual.

If the supply pressure is lower or higher than the nominal pressure, the reason should be investigated and the gas supplier contacted.

For natural gas ovens, if the measured supply pressure is lower than 3.5″ wc, or higher than 7″ wc, contact the gas supplier. DO NOT OPERATE THE OVEN or adjust the oven controls.

2.Adjusting the Orifice (Manifold) Pressure and Heat Input

To use the orifice pressure method, you must know the specific gas type and quality used. If using the orifice pressure method, you should double-check the input using the volumetric method.

To use the volumetric method, you must know the heat value (HuB) of the gas used. This information is available from your gas supplier.

During these measurements, do not operate any other appliances that use the same gas meter as the oven.

a.Orifice (Manifold) Pressure Method

1.With the main gas supply valve closed and the circuit breaker/fused disconnect in the OFF (“O”) position, open the manifold pressure tap shown in Figure 2-13 and attach a manometer to the tap.

2.Remove the cap screw from the pressure adjustment screw (governor) on the gas control valve.

3.Depress the safety switches to allow the oven to operate.

4.Open the main gas supply valve. Switch the circuit breaker/fused disconnect to the ON (“I”) position.

5.Start the oven according the directions in the Operation section of this Manual. Adjust the temperature controller to the maximum setting (316°C).

6.Adjust the pressure adjustment screw as necessary to match the correct pressure for the oven's specific gas type. Refer to the Pressure Table in the Description section of this Manual. Turning the adjustment screw clockwise increases the flow, while turning it counterclockwise reduces the flow.

7.Switch the oven off. Close the main gas supply valve, and switch the circuit breaker/fused disconnect to the OFF (“O”) position. Remove the manometer, and close the manifold pressure tap.

HuB (Heat [Calorific] value

of gas in kW/m3)

Time (in minutes) of

6

=

 

0.1m3 of gas usage

Consumption

 

2.Check that the main gas supply valve and the circuit breaker/fused disconnect are in the OFF (“O”) position.

3.Remove the cap screw from the pressure adjustment screw (governor) on the gas control valve.

4.Depress the safety switches to allow the oven to operate.

5.Open the main gas supply valve. Switch the circuit breaker/fused disconnect to the ON (“I”) position.

6.Start the oven according the directions in the Operation section of this Manual. Adjust the temperature controller to the maximum setting (316°C).

7.Adjust the pressure adjustment screw as necessary to match the calculated volume using the time (in minutes) of 0.1m3 of gas usage. Turning the adjustment screw clockwise increases the flow, while turning it counterclockwise reduces the flow.

8.Record the reading obtained from the gas meter and calculate the obtained gas flow. Compare this value to the information in the tables in the Description section of this Manual.

9.Switch the oven off. Close the main gas supply valve, and switch the circuit breaker/fused disconnect to the OFF (“O”) position. Replace the cap screw onto the gas control valve.

Figure 2-13 - Gas Control Valve

Pressure

adjustment

screw

(under cap)

Mainfold

pressure tap

(where regulated gas pressure is measured)

16

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Contents Owners operating Page Middleby Marshall IiiTable of Contents Section Description Model IdentificationThis Manual Must Be Kept For Future Reference PS520 Series Oven SpecificationsSeries PS520 Electrical Specifications PS520-Series Oven Components Locations II. Component Function Cooling Fan Blank Plates two sizes and an Air Finger F2. Blank PlatesSection Installation Parts List for Series PS520 GAS Oven Installation KIT UnloadingParts List for Series PS520 Gas Oven Model PS520 Single Oven Dimensions Model PS520 Double Oven Dimensions Model 520 Triple Oven Dimensions II. Ventilation Guidelines Electric Supply to be Provided by Customer Circuit BreakerIV. Electric Supply for GAS Heated Ovens 11. Junction Connection BoxGAS Supply 13 Gas Control Valve Section Operation Control FunctionsDoor Safety Switch Blower SwitchHeat Switch Temperature ControllerSee Figures 3-4 Measuring Conveyor SpeedConveyor Startup Procedures Daily Startup Power FailureShutdown Procedure III. STEP-BY-STEP OperationControl Panel Daily Startup Procedure IV. Normal Operation STEP-BY-STEPSP Lock Quick Reference Troubleshooting SymptomSection Maintenance Maintenance Daily ExteriorCooling Fan Conveyor Belt FigureII. Maintenance Monthly Removing Conveyor From Oven For CleaningSection Maintenance Air Fingers Disassembly For Cleaning T1 T2 T3 B1 B2 B3Reassembly of Air Fingers 12. Standard Lower FingerExtended Lip Tab on Outer Plate Flange Finger Manifold Section Maintenance Reinstall End Plugs Conveyor Reassembly Into Oven Checking Conveyor Belt TensionConveyor Belt Link Removal Attaching Drive Chain III. Maintenance Every 3 Months IV. Maintenance Every 6 MonthsImportant Notices Electrical TerminalsKEY Spare Parts KIT PS520-SERIES GAS Oven KEY Spare Parts KIT FigureSection Troubleshooting Section Troubleshooting Schematics Section Section Electrical Schematics Section Electrical Schematics

PS520G specifications

The Middleby Marshall PS520G represents a significant leap forward in the world of commercial cooking equipment, specifically designed to meet the demands of high-volume foodservice operations. This innovative conveyor oven is engineered for efficiency, speed, and high-quality results, making it a favorite among pizza parlors, restaurants, and fast-food businesses.

One of the standout features of the PS520G is its gas-powered operation. The use of natural gas or propane not only enhances cooking speed but also contributes to lower operational costs when compared to electric models. This advantage allows establishments to serve more customers in less time, thereby maximizing revenue.

The PS520G is equipped with advanced technology that ensures consistent cooking results. Its patented Air Impingement technology circulates heated air within the cooking chamber, ensuring that every item receives even heat distribution. This technology is particularly beneficial for achieving perfectly cooked pizzas, breads, and other baked goods. The ability to cook food quickly while maintaining moisture and flavor is a hallmark of this model.

Another significant characteristic of the PS520G is its versatile cooking capabilities. The unit features adjustable conveyor speed, allowing operators to customize cooking times according to the type of food being prepared. This flexibility is essential in a bustling kitchen environment where different menu items require distinct cooking times.

The construction of the PS520G is robust and designed for durability, with stainless steel exteriors that are not only attractive but also easy to clean. Additionally, the oven's efficient design includes a high-capacity cooking chamber that can accommodate larger items, making it suitable for various food types.

A critical aspect of any commercial kitchen equipment is ease of use, and the PS520G shines in this area as well. The user-friendly digital controls allow for precise temperature settings and monitoring, enabling kitchen staff to maintain high standards in cooking. Moreover, the self-cleaning feature simplifies maintenance, ensuring the oven operates at peak performance with minimal downtime.

In summary, the Middleby Marshall PS520G conveyor oven embodies a perfect blend of technology, efficiency, and versatility. Its gas-powered operation, advanced cooking technologies, and durable construction make it an indispensable asset for any high-volume foodservice operation, driving both productivity and quality in food preparation. With the PS520G, businesses can ensure they are well-equipped to meet the culinary demands of their customers, providing fast and delicious meals consistently.
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