Middleby Cooking Systems Group PS870 Series instruction

Mount the new reflector bracket to the provided holes on the front right-hand side of the oven. The reflector should be positioned just above the conveyor belt.

Using an assistant, hold both back cover switches in the closed position. This will allow power to the photo-eye, and it will provide a red beam for aiming. Loosen one of the screws holding the photo detector gimbal tight, allowing it to be reaimed at the reflector. The beam should hit exactly in the center of the reflector, then tighten the screw back down.

Note: This is MUCH easier in reduced light.

Replace all covers.

CONVEYOR BELT REVERSAL

Conveyor belt reversal consists of four steps:

1.Physically reversing the conveyor belt.

2.Moving the lower thermocouple.

3.Resetting direction jumper on the conveyor control board.

4.Switching the photo detector.

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.

MOVING THE LOWER THERMOCOUPLE

The lower thermocouple needs to be moved from the lower outer most hole to the opposite side lower outer most hole. The thermocouple electrical connection needs to be moved as well. Insert the thermocouple (TC2) into the thermocouple hole left open by the removal of the coverplate. Secure the thermocouple (TC2 and rename TC3) with the two (2) 6-32 screws that were removed previously. Secure the coverplate with the two (2) 6-32 screws over the hole where the thermo- couple (TC2) was removed.

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.

SWITCHING PHOTO DETECTOR

Remove both rear fan belt covers, then remove the motor cover assembly from both sides of the oven. The photo eye is located on the front side of the left motor bracket. Disconnect the three connecting wires, noting which color wires assemble to the associated wires on the photo-detector. Remove the entire photo detector bracket. Replace the assembly to the right- hand side of the unit, mirroring the way it was assembled on the left. Reconnect the detector wiring in the same order it was on the left.

Incoming electrical power lines are fed through the strain- relief fitting, shown in Figure 2-12. 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 Compart- ment Access Panel is opened, OR when either of the blower or rear shrouds is removed.