Middleby Marshall PS520 installation manual IV. Electric Supply for Electrically Heated Ovens

These ‘C’ Channel brackets are installed in the vertical plane using existing screws (Item 6) to support these ‘C’ Channels using the upper and lower Key Hole openings in the ‘C’ Channels. The ‘C’ Channels are identical and once installed will allow ample amounts of air through the cooling fan mounted on the rear side of the ovem by keeping the oven away from the rear wall.

If you have any questions about how to mount these two ‘C’ Channel brackets, kindly phone Middleby Technical

Services at 847-741-3300. Press 3, then 5 for Technical Support.

III.ELECTRICAL CONNECTION INFORMATION FOR PS520-SERIES OVENS.

WARNING

Authorized supplier personnel normally ac- complish the connections for the ventilation system, electric supply, as arranged by the customer. Following these connections, the factory-authorized installer can perform the initial startup of the oven.

Check the oven data plate (Figure 2-10) before making any electric supply connections. Electric supply connections must agree with data on the oven data plate.

NOTE: The electric supply installation must satisfy the requirements of the appropriate statutory authority, such as the National Electrical Code (NEC), ANSI/NFPA70, (U.S.A.); the Canadian Electrical Code, CSA C22.2; the Australian Code AG601; or other applicable regulations.

SECTION 2

INSTALLATION

A fused disconnect switch or a main circuit breaker (customer furnished) MUST be installed in the electric supply line for each oven; it is recommended that this switch/ circuit breaker have lockout/tagout capability. The electric supply connection must meet all national and local electrical code requirements. Copper is the recom- mended material for the electrical supply conductors.

IV. ELECTRIC SUPPLY FOR ELECTRICALLY HEATED OVENS

Power requirements for electrically heated ovens are usually 208 - 240VAC, 1-phase, 3-wire (2 ‘hot’, 1 ground), although ovens built for export can have power require- ments of 380VAC and 480VAC. (These ovens have a 4-wire system.) A 1.5″ (38mm) diameter cutout/hole in the back of the machiney compartment provides access for the electrical supply connections on 380V and 480V units. 208V and 240V units have a cord and plug. Using flexible cable(s) for the electrical power supply conductors re- quires a 2″ (51mm) strain-relief fitting (not furnished) to enable safe access to the terminal block from which oven power is distributed.

The supply conductors must be of the size and material (copper) recommended to provide the cur- rent required; (refer to the data plate for the ampere specifications). The electric current rating for each conductor supplying a PS520-Series Oven ranges from a minimum of 17.3 amperes to a maximum of 39.9 amperes.

Typical specifications for each PS520-Series Oven are 208V or 240V, 1-phase, 3-wire, 8.3kW; this oven requires 50-ampere service. A PS520-Series Double Oven (Figure 1-2) installation would require two 50-ampere service connections, one for each oven; the 8.3kW power con- sumption also doubles for such an installation to 16.6kW.

The 208V or 240VAC electrically heated oven uses two legs of the supplied power to provide 208V or 240VAC power for the oven control circuitry.

Figure 2-10. Typical Electric Oven Data Plate Figure 2-11. Junction Connection Box

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