Middleby Marshall Model PS536 installation manual VI. Electrical Supply, VII. GAS Supply

SECTION 2 - INSTALLATION

VI. ELECTRICAL SUPPLY

WARNING

Authorized supplier personnel normally accomplish the connections for the ventilation system, electric supply, and gas supply, as arranged by the customer. Following these connections, the factory-authorized installer can perform the 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 Canadian Electrical Code, CSA C22.2; the Australian Code, 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 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 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 machinery compartment of the oven. Electrical specifications are also listed on the oven's serial plate and in Tables 1-3 and 1-4, Elec- trical Specifications (in Section 1, Description).

The oven requires a ground connection to the oven ground screw located in the electrical junction box. (The box is shown in Figure 2-13.) If necessary, have the electrician supply the ground wire. Do NOT use the wiring conduit or other piping for ground connections!

A.Additional Information - Gas Ovens

B.Additional Information - Electric Ovens

A 1.3" (33mm) dia. cutout in the back wall of the machinery compartment provides access to the electrical supply connections. The actual wiring connections are made at the terminal block located in the electrical junction box.

Using flexible cables for the electric power supply conductors requires a 1.3" (33mm) strain-relief fitting (not furnished with the oven) to enable safe access to the terminal block.

C.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.

Figure 2-13 - Utility connection locations

Electrical

Junction Box

ENGLISH

All electric supply connections are made at the terminal block located in the electrical junction box, shown in Figure 2-13. The power lines then connect to the oven circuits through a safety switch located inside the machinery compart- ment. This switch interrupts electric power to the oven when the Machinery Compartment Access Panel is opened.

1.3" (33mm) cutout for electric utility connection (electric ovens only)

1/2" NPT pipe for gas

utility connection (gas ovens only)

VII. GAS SUPPLY

CAUTION	3. If incoming pressure is over 14” W.C. (35mbar), a sepa-
DURINGPRESSURETESTINGNOTEONEOFTHEFOLLOWING:	rate regulator MUST be installed in the line BEFORE the
1. The oven and its individual shutoff valve must be discon-	individual shutoff valve for the oven.
	WARNING: To prevent damage to the control valve regula-
nected from the gas supply piping system during any
pressure testing of that system at test pressure in excess	tor during initial turn- on of gas, it is very important to open
of 1/2 psi (3.45 kPa).	the manual shutoff valve very slowly.
2. The oven must be isolated from the gas supply piping	After the initial gas turn-on, the manual shutoff valve must
system by closing its individual manual shutoff valve dur-	remain open except during pressure testing as outlined in
ing any pressure testing of the gas supply piping system at	the above steps or when necessary during service main-
test pressure equal to or less than 1/2 psi (3.45 kPa).	tenance.

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