Middleby Marshall PS500 - Manual (Page 11)

11
ENGLISH
SECTION 2 - INSTALLATION
A. 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 disconnect
are in the OFF ("O") position. After completing these proce-
dures, 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: The gas supply connection should be according 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 inter-
national codes.
Check the oven’s gas supply requirements before making the
gas utility connection. Gas supply requirements are listed on
To Gas
Supply Pipe
90°
Elbow
Union OR quick-
disconnect device
Flexible
Gas Hose
Full-Flow
Gas
Shutoff
Valve
90°
Elbow
the oven’s serial plate and in Table 1-5, Gas Orifice and
Pressure Specifications (in Section 1, Description).
Check the serial plate to determine the type of gas to be used
with the oven. Check that the gas type indicated matches the
local supply at the installation. If the gas type on the serial plate
does NOT match the local supply, directions for converting the
oven for use with other gases are described in Part B, Preparation
for Use with Various Gases, in this section.
One 90° elbow equals a 2.13m length of pipe. The recommended
pipe sizes are larger than usually required to eliminate any
operation problems. It is much less expensive to make the
initial installment large enough to do the job rather than redoing
the job later.
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 2-15; however,
compliance with the applicable standards and regulations is
mandatory.
Figure 2-15 - Flexible Gas Hose Installation
VII. GAS SUPPLY
CAUTION
DURING PRESSURE TESTING NOTE ONE OF THE FOLLOWING:
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 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 3.45 kPa.
3. If incoming pressure is over 50mbar, a separate regula-
tor MUST be installed in the line BEFORE the individual
shutoff valve for the oven.
WARNING: To prevent damage to the control valve regula-
tor 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 main-
tenance.