Middleby Marshall PS360S IX. GAS SUPPLY gas ovens only, individual shutoff valve for the oven

	SECTION 2 - INSTALLATION
IX. GAS SUPPLY (gas ovens only)
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.
nected from the gas supply piping system during any pres-	WARNING: To prevent damage to the control valve regula-	ENGLISH
sure testing of that system at test pressure in excess of 1/	tor during initial turn- on of gas, it is very important to open
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 during	remain open except during pressure testing as outlined in
any pressure testing of the gas supply piping system at test	the above steps or when necessary during service mainte-
pressure equal to or less than 1/2 psi (3.45 kPa).	nance.

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

•One or two oven cavities: 750 cfh meter

•Three or four oven cavities: 1200 cfh 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.Connection

Check the oven’s gas supply requirements before making the gas utility connection. Gas supply requirements are listed on the oven’s serial plate (Figure 2-23) and in the Gas Orifice and Pressure Specifications table (Page 5 of this manual).

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 2-25; however, compliance with the applicable standards and regulations is mandatory.

Inlet, regulated, and pilot gas pressure readings can be taken using a “U” tube manometer at the tap locations shown in Figure 2-26.

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.

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

CANADIAN:

CAN/CGA-B 149.1 Natural Gas Installation Code CAN/CGA-B 149.2 Propane Installation Code

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, because the oven is 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 U.S.A.), or, if appli- cable, Connectors for Movable Gas Appliances, CAN/CGA-6.16 (in Canada), as well as a quick-disconnect device that complies with the Standard for Quick-Disconnect Devices for Use With Gas Fuel, ANSI Z21.41 (in U.S.A.), or, if applicable, Quick- Disconnect Devices for Use With Gas Fuel, CAN1-6.9 (in Canada).

C.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 Marshall Gas Conversion Kit for the specific oven model.

WARNING

The terms of the oven's warranty require all start-ups, conversions and service work to be performed by a Middleby Marshall Authorized Service Agent.

Figure 2-26 - Gas Burner and Piping Assembly

			Model PS360EWB Only
	Manifold pressure tap	Burner	Modulating gas valve
	(where manifold gas	Blower
	pressure is measured)		NOTE: PS360EWB ovens use a
			modulating gas valve INSTEAD OF
			a high flame solenoid valve and
			low-flame bypass line.
Inlet pressure tap	On/Off Knob
	Always leave in
(where incoming	“ON” position	Gas Burner
gas pressure is
measured)	High Flame	Pilot pressure tap
	Solenoid Valve	(where pilot gas
	Combination Gas	pressure is measured)
	Control Valve
	(Safety Regulator)
Manual		Low Flame
shutoff valve		Bypass Line

15