PS500-series blower wheel orientation

SECTION 3 - SERVICING COMPONENTS

2.Blower balancing and direction of rotation

Proper blower rotation is extremely important. Proper blower rotation is shown in Figure 45.

Early PS570 blower wheels were positioned so that the open end of the wheel faced into the baking cham- ber. This was changed on the PS570S (and all later models) to improve airflow. Note that this also means that on early PS570 ovens the counterclockwise wheel is moved to the left side of the oven, and the clockwise wheel moved to the right side, so that the wheel blades point in the same direction. This is reflected in the Part Number Reference information on Page 77.

All blower wheels are balanced at the factory. Any blower wheel found to be out of balance should be re- placed. Vibration from an out-of-balance wheel can cause poor baking and premature bearing failure. Note that vibrations can also be caused by other sources, including defective motor or blower shaft bearings, loose bearings or motor mounting bolts, or an incorrectly tensioned fan belt.

3.Lubricating the blower shaft bearings

IMPORTANT: Middleby uses two different types of grease in blower shaft bearings:

•DuPont Krytox® grease is used in some PS536 ovens. Refer to Service Bulletin MM- 192 (included in the Appendices section of this chapter) for details on identifying Krytox® bearings.

•All other ovens use the standard Middleby high-temperature grease, P/N 17110-0015.

Mixing grease types within the bearing will cause the bearing to seize. For all PS555/570- series ovens, be sure to use ONLY the stan- dard Middleby grease.

NOTE: Middleby recommends lubricating the blower fan shaft bearings every three months.

Use a grease gun to lubricate the main blower fan shaft bearings. See Figure 46. When lubricating the bear- ings:

•Use a high-quality NLGI #2, lithium soap grease with petroleum oil, such as Middleby P/N 17110-0015.

•Add the grease slowly until a small bead of grease is present at the seals. AVOID OVERGREASING. Excessive greasing may cause harm to the bearing.

Manually turn the blower shaft by pulling on the belt to purge the grease. Wipe off any excess grease. The oven cannot be operated until the rear shroud is replaced.

Figure 45

Clockwise:	PS570:	Counter-
Right end	Open end of wheel faces IN	clockwise:
		Left end

Counter-	PS570S, PS570G, PS555:	Clockwise:
clockwise:	Open end of wheel faces OUT	Left end
Right end

Note slant of blades

Figure 46

Bearing lubrication

Grease fittings (1 per bearing, 4 total)

PS570,

PS570S

Grease fittings (1 per bearing, 4 total)

PS570G,

PS555

PS224 PS310, PS220, PS555, PS200, PS360 specifications

The Middleby Marshall PS555 is a standout commercial pizza oven renowned for its performance, efficiency, and advanced technologies. Designed with the modern pizzeria in mind, the PS555 delivers exceptional cooking results while maximizing energy efficiency and throughput.

One of the key features of the PS555 is its innovative cooking technology, which incorporates both convection and radiant heat. This unique combination ensures that pizzas are cooked evenly and quickly, achieving a perfectly crispy crust and evenly melted cheese every time. The oven’s high-speed air impingement system accelerates cooking times, allowing pizzerias to serve more customers in less time without compromising quality.

The PS555 is designed with a spacious cooking chamber that can accommodate multiple pizzas simultaneously. With its ability to fit pizzas up to 18 inches in diameter, the oven is ideal for establishments with high demand. Additionally, the adjustable conveyor speed allows operators to customize the cooking time based on their specific menu items, enhancing versatility and productivity.

Energy efficiency is a hallmark of the Middleby Marshall PS555. The oven utilizes advanced insulation materials to minimize heat loss, ensuring that it operates at optimal temperatures while consuming less energy. This efficiency not only reduces operating costs but also contributes to a more sustainable kitchen environment.

User-friendly controls make it simple for operators to manage the cooking process. The PS555 features digital controls with programmable settings, enabling quick adjustments to temperature and cooking time. This ensures consistent quality across different shifts and helps maintain product standards while simplifying staff training.

Durability is another defining characteristic of the PS555. Built with high-quality materials, the oven is designed for heavy use in busy commercial kitchens. Its stainless steel construction ensures resistance to wear and tear, making it a worthwhile investment for any pizzeria.

In summary, the Middleby Marshall PS555 pizza oven is a high-performance piece of equipment that combines advanced cooking technologies, efficiency, and durability. Its ability to deliver consistently excellent results while streamlining operations makes it an essential asset for any pizza business aiming to enhance its productivity and customer satisfaction.

Middleby Marshall PS360, PS570, PS200 PS500-series blower wheel orientation, Bearing lubrication

Models: PS224 PS310 PS220 PS555 PS200 PS360 PS570

SECTION 3 - SERVICING COMPONENTS