Middleby Marshall X55G Series, Owner'S Operating & Installation Manual

Page: 25 / 46

SECTION 2
INSTALLATION
25
location shown in Figure 28, which also shows the gas
train and burner assembly.
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.
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.), 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.).
A. 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.
NOTICE
The terms of the oven’s warranty require all startups,
conversions and service work to be performed by a
Middleby Authorized Service Agent.
B. X70G/X55G Propane Conversion Kit 77601
Three (3) tasks must be performed to change the oven
to operate on Liquid Propane gas:
−
Replace main orifices (Figure 26)
−
Replace the bypass orifice (Figure 27)
− Adjust manifold gas pressure
1. Disconnect the burner manifold union closest to
the main burner, and remove the manifold
assembly (four screws). Slide out the manifold
assembly (leaving the ignition and sense wires
connected).
Burner Manifold
2. Replace the main orifices (Figure 26) on the
manifold assemblies with the supplied LP orifices
and replace the manifold assembly. Reconnect
and secure the union. Check for leaks.
3. Loosen the brass compression fittings at each end
of the fixed orificed by-pass tubing. Remove the
by-pass tubing from the gas train (Figure 28).
Remove the mushroom spud orifice from the by-
pass tubing (Figure 27) and replace with the
supplied LP by-pass orifice. Remount the by-pass
tubing assembly and tighten all the fittings. Check
for leaks.
Bypass Orifice Inside Tube
4. Remove the existing spring from the gas valve and
insert the spring supplied in the conversion kit into
the gas valve. The proper pressure setting for
propane gas is 6" W.C. (1.49 kPa). Re-establish
the main gas supply and again check for any gas
leaks.