Middleby Marshall PS540G installation manual Flexible Gas Hose Installation

A. Connection

Check the oven’s gas supply requirements before making the gas utility connection. Gas supply requirement are listed on the oven’s serial plate and in Table 1-4. Gas Orifice and Pressure Specifications (in Section 1, Description).

Check the serial plate to determine the type of gas (Propane or Natural) to be used with the oven.

Refer to the instructions in the gas hose package (included in the Installation Kit) before connecting the gas line. One gas line connection method is shown in Figure 2-18; however, compliance with the applicable standards and regulations is mandatory.

Inlet, regulated, and pilot gas pressure readings can be takenusingadigitaltubemanometeratthetaplocationshown in Figure 2-19. Figure 2-19 shows the burner assembly and Figure 2-21 shows the gas valve.

NOTE: The installation must conform with local codes or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1-latest edition.

1/2″ gas pipe nipple

1/2″ gas line

tee with

pressure tap

Quick-

disconnect

device

SECTION 2

INSTALLATION

3/4″-1/2″
gas pipe	To Gas
reducer
	Supply
	Pipe
3/4″ gas
pipe nipple
90°
Elbow

Full-Flow

Gas

Shutoff

Valve

Flexible	Individual gas
	connection for
Gas Hose
	each oven
	cavity

Certain safety code requirements exist for the installation of gas ovens;refertothebeginningofSection2foralistoftheinstallation standards.Inaddition,becausetheovenisequippedwithcasters, 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 U.S.A.), as well as a quick-discon- nectdevicethatcomplieswiththeStandardforQuick-Disconnect Devices for Use With Gas Fuel, ANSI Z21.41 (in U.S.A.).

B.Gas Conversion

Where permitted by local and national codes, it is possible to convert ovens from natural to propane gas, or from propane to natural gas. Use the appropriate Middleby Gas Conversion Kit for the specific oven model.

CAUTION: The terms of the oven’s warranty require all start- ups,conversionsandserviceworktobeperformed by a Middleby Authorized Service Agent.

C.PS540 Propane Conversion

Two items have to be changed, to change the oven to LP:

1.Replace main orifice.

2.Adjust main gas regulator per instructions below.

Disconnect the manifold union closest to the main burner, and remove the manifold assembly. Replace the main orifice.

Replace the main orifice on the manifold assemblies with the LP units, and replace the manifold assembly.

D.Adjusting the Maximum Pressure Setting

1.Disconnect pressure feedback connection (if appcable).

2.Connectasuitablepressuregaugetopipelineortooutletpressure tap of gas control concerned, to measure burner pressure (mea- suring point must be as near to burner as possible).

Figure 2-13. Flexible Gas Hose Installation

Figure 2-14. Gas Burner Assembly

3.Make sure that the appliance is in operation and the Moduplus® coil is energized with maximum current.

4.If maximum rate pressure needs adjustment, use an 8 mm wrench to turn adjustment screw for maximum pressure setting (clockwise to increase or counter-clockwise to decrease pressure), until the desired maximum outlet pressure is obtained.

5.Disconnect electrical connection of the Moduplus®.

6.Check minimum pressure setting and readjust if neces- sary. (See Adjusting Minimum Pressure Setting for proper adjusting procedure.)

7.Reconnect pressure feedback connection (if appcable).

8.If minimum and maximum pressures are set, wire the Moduplus® in circuit.

9.Close pressure tap screw.

21