Middleby Marshall PS629G Series, Owner'S Operating & Installation Manual

Page: 20 / 52

SECTION 2
INSTALLATION
20
IV. ELECTRIC SUPPLY FOR GAS
HEATED OVENS
Power requirements for gas heated ovens are 208 -
240VAC, 1-phase, 3-wire (2 “hot”, 1 ground). Electrical
connection is made through a cord and plug. Using
flexible cable(s) for the electrical power supply
conductors requires a 2" (51mm) strain-relief fitting to
enable safe access to the terminal block from which
oven power is distributed.
The supply conductors must be of the size and
material (copper) recommended to provide the current
required (refer to the data plate for the ampere
specifications).
The electric current rating for each conductor
supplying a PS629G-Series Oven is 2.0A.
Junction Connection Box
V. GAS SUPPLY
CAUTION
DURING PRESSURE TESTING NOTE THE
FOLLOWING:
1. The oven and its individual shutoff valve must
be disconnected from the gas supply piping
system during any pressure testing of that
system at test pressure in excess of 1/2 psi
(3.45kPa).
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 (3.45kPa).
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.
NOTICE
To prevent damage to the control valve regulator
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 (307 ℓ /min) meter
Gas Line
•
DEDICATED LINE from the gas meter to the oven
•
1-1/2" (38.1mm) 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
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 start-ups,
conversions and service work to be performed by a
Middleby Authorized Service Agent.
C. PS629G Propane Conversion
Two items have to be changed, to change the oven to
LP:
1. Replace main orifices.
2. Adjust main gas regulator per instructions below.
Disconnect the 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).
Replace the main orifices on the manifold assemblies
with the LP units, and install the manifold assembly.
Reconnect the union.