Middleby Marshall PS740 Series Gas Ovens P/N 60250 - Manual (Page 20)

16 P/N 60250 September 28, 2012
5. If it is necessary to add or remove conveyor links to achieve
the correct tension, OR if it is necessary to reverse the
conveyor belt for correct orientation, the belt will need to
be removed from the conveyor frame. If this is necessary,
perform the following procedure:
• Remove the conveyor assembly from the oven and place
it flat on the floor.
• Remove the master links using long-nose pliers. Then,
roll up the belt along the length of the conveyor frame.
• Add or remove belt links as necessary to achieve the
correct belt tension.
• Replace the belt on the conveyor frame. Check that the
conveyor belt links are oriented as shown in Figure 2-15,
and that the smooth side of the conveyor belt faces UP.
• Connect the inside master links. Check that the links
are oriented as shown in Figure 2-15.
• Connect the outside master links. Note that the outside
master links each have an open hook on one side. This
hook aligns with the hooks along the sides of the other
conveyor links. See Figure 2-15.
• Replace the conveyor into the oven.
Figure 2-15. Conveyor and Master Link orientation
E. Final Assembly
1. Install the crumb trays underneath the conveyor as shown
in Figure 2-16.
REVERSING THE CONVEYOR BELT
Remove the conveyor from the oven and find the master link
location. Remove master links and remove the belt from the
conveyor frame. Reassemble the belt back onto the frame (in
the reverse direction) and reinstall the master links. Replace
the conveyor assembly in the oven.
RESETTING DIRECTION JUMPER
Locate Jumper P1 on the conveyor control board. Move jumper
from terminals 1 and 2, and replace onto terminals 2 and 3.
CAUTION: Shock hazard in compartments electrical filters
are electrically alive.
SWITCHING PHOTO DETECTOR
CAUTION: Disconnect Power Before Switching Photo eye.
Remove the three screws securing the access door to the unit.
Open the access door and disconnect the connector fitting to
the photo eye assembly. Remove the two screws securing the
photo eye assembly to the control box. Remove the four nuts
securing the photo eye to the housing. Rotate the photo eye
180 degrees and resecure the photo eye with the four nuts.
On the opposite control box, remove the two screws holding the
cover where the photo eye assembly will be positioned. Secure
the photo eye assembly in position with the two screws. Place
the photo eye cover on the opposite control box, where the
photo eye assembly was removed, and secure the two screws.
Secure the access door with the three screws.
Remove the three screws securing the access door on the
opposite side. Open the access door, where the photo eye is
now positioned, and connect the photo eye connector fitting.
Secure the access door with the three screws.
Apply power to the unit. Adjust the photo eye height by loosening
the two screws securing the photo eye assembly and sliding
the photo eye assembly either up or down, such that the beam
is approximately 1/4 inch above the belt.
Note: This is MUCH easier in reduced light.
Replace all covers.
VI. ELECTRICAL SUPPLY
WARNING: Authorized installation personnel normally ac-
complish 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 require-
ments of the appropriate statutory authority such as the
National 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
Figure 2-16. Crumb Trays
Crumb tray
insertion
Direction
of travel
CORRECT
master link
position
Incorrect
master link
position
CONVEYOR BELT REVERSAL
Conveyor belt reversal consists of three steps:
1. Physically reversing the conveyor belt.
2. Resetting direction jumper on the conveyor control board.
3. Switching the photo detector.