Middleby Cooking Systems Group PS536 - Manual (Page 13)

13
ENGLISH
SECTION 2 - INSTALLATION
VI. ELECTRICAL SUPPLY
WARNING
Authorized supplier personnel normally accomplish
the connections for the ventilation system, electric supply,
and gas supply, as arranged by the customer. Following
these connections, the factory-authorized installer can
perform the initial startup of the oven.
NOTE: The electric supply installation must satisfy the
requirements of the appropriate statutory authority, such as the
National Electrical Code (NEC), ANSI/NFPA70, (U.S.A.); the
Canadian Electrical Code, CSA C22.2; the Australian Code,
AG601; or other applicable regulations.
NOTE: The electric supply connection must meet all national
and local electrical code requirements.
Check the oven serial plate before making any electric supply
connections. Electric supply connections must agree with data
on the oven serial plate. The location of the serial plate is shown
in Figure 1-1 (in Section 1, Description).
A fused disconnect switch or a main circuit breaker
(customer furnished) MUST be installed in the electric
supply line for each oven cavity. It is recommended
that this switch/circuit breaker have lockout/tagout
capability.
The supply conductors must be of the size and
material (copper) recommended. Refer to the wiring
diagram inside the machinery compartment of the
oven. Electrical specifications are also listed on the
oven's serial plate and in Tables 1-3 and 1-4, Elec-
trical Specifications (in Section 1, Description).
The oven requires a ground connection to the oven
ground screw located in the electrical junction box.
(The box is shown in Figure 2-13.) If necessary, have
the electrician supply the ground wire. Do NOT use
the wiring conduit or other piping for ground
connections!
A. Additional Information - Gas Ovens
All electric supply connections are made at the
terminal block located in the electrical junction
box, shown in Figure 2-13. The power lines then
connect to the oven circuits through a safety
switch located inside the machinery compart-
ment. This switch interrupts electric power to the
oven when the Machinery Compartment Access
Panel is opened.
B. Additional Information - Electric Ovens
A 1.3" (33mm) dia. cutout in the back wall of the machinery
compartment provides access to the electrical supply
connections. The actual wiring connections are made at
the terminal block located in the electrical junction box.
Using flexible cables for the electric power supply
conductors requires a 1.3" (33mm) strain-relief fitting (not
furnished with the oven) to enable safe access to the
terminal block.
C. Connection
Refer to the wiring diagram inside the machinery
compartment of the oven to determine the correct
connections for the electrical supply lines. Connect the
supply as indicated on the wiring diagram.
Electrical
Junction Box
1.3" (33mm) cutout for
electric utility connection
(electric ovens only)
Figure 2-13 - Utility connection locations
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 1/2 psi (3.45 kPa).
2. The oven must be isolated from the gas supply piping
system by closing its individual manual shutoff valve dur-
ing any pressure testing of the gas supply piping system at
test pressure equal to or less than 1/2 psi (3.45 kPa).
3. If incoming pressure is over 14” W.C. (35mbar), a sepa-
rate regulator 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.
1/2" NPT pipe for gas
utility connection
(gas ovens only)