Middleby Marshall PS638 Series, Руководство владельца по эксплуатации и установке

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17
Electrical Junction Box
(one per oven cavity)
Electrical Knock Out
(strain relief required)
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 the
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
Table 1-3, Electrical Specifications (in Section 1,
Description).
The oven requires a ground connection to the oven ground
screw. For gas ovens, the screw is located in the electrical
junction box (see Figure 2-17). If necessary, have the
electrician supply the ground wire. Do NOT use the wiring
conduit or other piping for ground connections.
Incoming electrical power lines are fed through the strain-
relief fitting, shown in Figure 2-17. The electrical supply
connections are made inside the electrical junction box. The
power lines then connect to the oven circuits through safety
switches located inside the machinery compartment and
each blower motor compartment. These switches interrupt
electrical power to the oven when the Machinery
Compartment Access Panel is opened, OR when the rear
panel is removed.
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.
The terms of the oven’s warranty require all
start-ups, conversions and service work to be
performed by a Middleby Marshall Authorized
Service Company.
VI. ELECTRIC SUPPLY FOR ELECTRICALLY
HEATED OVENS (cont.)
Power requirements for electrically heated ovens are usually
208 - 240VAC, 3-phase, 4-wire (3 ‘hot’, 1 ground), although
ovens built for export can have power requirements of
380VAC and 480VAC. (These ovens have a 5-wire system.)
A 2” (51mm) diameter cutout/hole in the back of the
machinery compartment provides access for the electrical
supply connections. Using flexible cable(s) for the electrical
power supply conductors requires a 2

(51mm) strain-relief
fitting (not furnished) 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
PS640E-Series Oven must comply to local and national
codes.
Typical specifications for each PS638E-Series Oven are
208V or 240V, 3-phase, 4-wire, 60-ampere, 34.4kW. A
PS638E Series Double Oven (Figure 1-2) installation would
require two 60-ampere service connections, one for each
oven; the 34.4kW power consumption also doubles for such
an installation to 68.8kW.
The 208V or 240VAC electrically heated oven uses two legs
of the supplied power to provide 208V or 240VAC power for
the oven control circuitry.
Figure 2-17. Utility Connections Locations for Electrically Heated Oven