Middleby Marshall PS53GS Gas Duringpressuretestingnotethefollowing, Gas Line, B. Gas Conversion

SECTION 2 - INSTALLATION

V. GAS SUPPLY

CAUTION

DURINGPRESSURETESTINGNOTETHEFOLLOWING:

1.The oven and its individual shutoff valve must be discon- nected from the gas supply piping system during any pressure testing of that system at test pressure in excess of 1/2 psi (3.45 kPa).

2.The oven must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressure equal to or less than 1/2 psi (3.45 kPa).

3.If incoming pressure is over 14" W.C. (35mbar), a separate regulator MUST be installed in the line BEFORE the individual shutoff valve for the oven.

WARNING: To prevent damage to the control valve regu- lator during initial turn- on of gas, it is very important to open the manual shutoff valve very slowly.

After the initial gas turn-on, the manual shutoff valve must remain open except during pressure testing as outlined in the above steps or when necessary during service maintenance.

A.Gas Utility Rough-In Recommendations

The following gas system specifications are STRONGLY RECOMMENDED. Deviating from these recommendations may affect the baking performance of the oven.

Gas Meter - 650 cfh (307l/min) meter

Gas Line

•DEDICATED LINE from the gas meter to the oven

•2" (50.8mm) pipe for natural gas

•1-1/2" (38.1mm) pipe for propane

•Maximum length: 200' (61m). Each 90° elbow equals 7' (2.13m) of pipe.

B.Gas Conversion

Ovens are shipped from the factory configured for use with natural gas. If permitted by local, national and international codes, the oven may be converted to propane gas operation using a Gas Conversion Kit that is supplied with the oven. Gas orifice sizes supplied with the Kit match those shown in Tables 1-4 and 1-5 in the Description section of this Manual.

Where permitted by local and national codes, it is possible to convert ovens from natural to propane gas, or from propane to natural gas, after the oven has been installed. Gas Conversion Kits are available from Middleby Marshall for this purpose.

C.Connection

WARNING

Some procedures in this section may require conver- sions, readjustments, or service on the oven's gas system. Before performing these procedures, check that the main gas supply valve and the circuit breaker/fused discon- nect are in the OFF ("O") position. After completing these procedures, perform a gas leak test before operating the

oven.

CAUTION

The terms of the oven's warranty require all start-ups, conver- sions and service work to be performed by a Middleby Marshall Authorized Service Agent. The installation, start-up and changes required when changing from one gas type to another can be performed ONLY by a certified professional.

NOTE: Certain safety code requirements exist for the installation of gas ovens; refer to the beginning of Section 2 for a list of the installation standards. In addition:

•In the USA, the installation must conform with local codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1.

•In Canada, the installation must conform with local codes, or in the absence of local codes, with the Natural Gas Installation Code, CAN/CGA-B 149.1, or the Propane Installation Code, CAN/CGA-B 149.2, as applicable.

•In Australia, the installation must conform with AGA Codes AG311 and AG601, and with any requirements of the appropriate statutory authority.

•In CE countries, the gas supply connection should be according to EN-203 (gas appliance directive) and to applicable ISO 228-1 or ISO 7-1 recommendations. All aspects of the gas supply connection must comply with current IEC/CEE requirements and with all applicable local, national, and international codes.

•For all ovens equipped with casters, the gas line connection shall be made with:

-A connector that complies with the Standard for Connectors for Movable Gas Appliances, ANSI Z21.69 (in USA), or Connectors for Movable Gas Appliances, CAN/CGA-6.16 (in Canada).

Check the oven’s gas supply requirements to determine the type of gas to be used with the oven. If the gas type required does NOT match the local supply:

•For North American installations, a conversion kit is supplied with the oven to allow operation using propane gas. Refer to Part B, Gas Conversion, in this section.

•For CE ovens, directions for converting the oven for use with other gases are described in Part D.1, Preparation for Use with Various Gases, in this section.

If the installation will use the supplied gas hose, be sure that the 1/2" to 3/4" gas line fitting is attached. Refer to the instructions in the gas hose package. One gas line connection method is shown in Figure 2-15; however, compliance with the applicable standards and regulations is mandatory.

Inlet and regulated gas pressures can be measured using a “U” tube manometer at the tap locations shown in Figures 2-15 and 2-16.

Figure 2-15 - Flexible Gas Hose Installation

1/2" gas

pipe nipple	3/4"-1/2"
	gas pipe
		To Gas
	reducer
		Supply
		Pipe
	3/4" gas
	pipe nipple

1/2" gas line

tee with

pressure tap90° Elbow

Full-Flow

Gas

Shutoff

Valve

	Flexible	Individual gas
Quick-		connection for
	Gas Hose
		each oven
disconnect
		cavity
device

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