Middleby Marshall PS300F Additional Information Electric Ovens, Additional Information Gas Ovens

SECTION 2 - INSTALLATION

VIII. ELECTRICAL SUPPLY (all ovens)

	WARNING
	Authorized supplier personnel normally accomplish
	the connections for the ventilation system, electric supply,
ENGLISH	and gas supply, as arranged by the customer. Following these
	connections, the factory-authorized installer can perform the
	Canadian Electrical Code, CSA C22.2; the Australian Code
	initial startup of the oven.
	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
	AG601; or other applicable regulations.
	NOTE: The electric supply connection must meet all national
	and local electrical code requirements.
	Check the oven serial plate before making any electric supply
	connections. Electric supply connections must agree with data
	on the oven serial plate. The location of the serial plate is shown
	in Figure 2-23.
	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 this 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 machin-
	ery compartment or control compartment of the oven. Electrical
	specifications are also listed on the oven's serial plate (Figure
	2-23) and in the Electrical Specifications table (on Page 5).
	The oven requires a ground connection to the oven ground screw
	located in the electrical junction box. (The box is shown in Figure
	2-24.) If necessary, have the electrician supply the ground wire.
	Do NOT use the wiring conduit or other piping for ground
	connections!
	Figure 2-23 - Oven Serial Plate

Serial plate location

CAUTION

Before connecting incoming power to the oven, measure the voltage of each input leg to neutral. The expected voltage is approximately 120V. ANY voltage reading exceeding 130V indicates that the supply has a “high” leg. CONNECTING A “HIGH” LEG TO THE OVEN VOIDS ALL OVEN WARRANTIES. Connecting a “high” leg to the black lead of the oven can severely damage the oven’s electrical and electronic components.

CAUTION

DONOTCONNECTBLACKWIRETOHIGHLEG.

VOLTAGEOFTHEBLACKANDWHITEWIRESMUST

BE NO HIGHER THAN 130 VAC.

A.Additional Information - Electric Ovens

For electric ovens, a 1-1/4" (32mm) dia. cutout in the back wall of the machinery compartment provides access for the electrical supply connections. Using flexible cables for the electric power supply conductors requires a 1-1/4" (32mm) strain-relief fitting (not furnished with the oven) to enable safe access to the terminal block from which power is distributed to the oven.

B.Additional Information - Gas Ovens

All gas oven electric supply connections are made via the electrical junction box on the rear of the oven, shown in Figure 2-24. The power lines then connect to the oven circuits through the Machinery Compartment Access Panel Safety Switch. This switch interrupts electric power to the oven when the Machinery Compartment Access Panel is opened.

C.Additional Information - Ovens with External Transform- ers (export versions)

Position the transformer on the rear wall of the oven, on the same side as the control compartment, as space permits. Fasten it in place using the supplied mounting hardware.

D.Connection

Refer to the wiring diagram inside the machinery compartment or control compartment of the oven to determine the correct connections for the electrical supply lines. Connect the supply as indicated on the wiring diagram. Be sure to connect the electrical supply ground wire to the oven ground screw located in the junction box on the rear of the oven.

Figure 2-24 - Utility Connection Locations

Electrical

Junction Box

Gas oven:

3/4" (19mm) pipe for gas utility connection

Electric oven:

1-1/2" (38mm) conduit for electric utility connection

NOTE: The location of these components may vary slightly depending on the oven model.

Figure 2-25 - Flexible Gas

Hose Installation

To Gas

Supply Pipe

Appliance

Connection/Male

Nipple

90°	Full-Flow Gas
Elbow	Shutoff Valve

Flexible

Gas Hose

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