Middleby Marshall PS555 Appendix - Instructions for Service Kits 33984 and, thermocouple leads

SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kits 33984 and 33985 -

Oven Thermocouple Kit, 11/01

PS555 Electric and PS555E

Temperature-sensing thermocouples on these ovens are lo- cated on the rear wall. High limit thermocouples are lo- cated inside the machinery compartment. All thermo- couples are secured in place by two screws that are in- serted through the holes in the thermocouple flange. These ovens are equipped with a three-lead, flanged thermocouple identical to the one in this Kit.

NOTE FOR HIGH LIMIT THERMOCOUPLES:

PS555E electric ovens are equipped with a high limit ther- mocouple at the front of the oven, inside the machinery compartment. All other PS555E, PS555G and PS570G ovens have a high limit thermocouple installed into the rear wall in the last mounting hole at the exit end of the oven.

The thermocouple supplied in this Kit can be used to replace ANY of the temperature-sensing or high limit ther- mocouples on the oven.

1.If you will be replacing the high limit thermocouple, open the machinery compartment door.

To replace any other thermocouple, first remove the rear shrouds. Then, remove the cover over the left blower motor. This allows access to the thermocouples on the rear wall, and to the terminal block inside the blower motor compartment.

Note that all of the rear wall thermocouples are con- nected to the terminal block inside the left blower mo- tor compartment. It is not necessary to access the right blower motor compartment.

2.Remove the screws that hold the thermocouple to the wall. Slide the thermocouple out of its mounting hole.

3.Disconnect the thermocouple leads. Rear wall ther- mocouples are connected to the terminal block inside the left blower motor compartment. High limit thermo- couples are connected directly to the high limit control module.

4.Remove and discard the thermocouple.

5.Install the new thermocouple into its mounting hole. Fasten it in place with the supplied #6 x 3/8” screws.

6.Wire the thermocouple as shown in Figure 10.

7.If you replaced a rear wall thermocouple, use the kit- supplied nylon clamp and #10-16 x 3/4” screw to se- cure the thermocouple leads so that they will clear the shrouds, blower belts, and pulleys.

8.Replace all shrouds onto the oven. Close the machin- ery compartment door.

					Figure 10
				Thermocouple Wiring - PS555 Electric and PS555E
Temperature-sensing					Temperature-sensing
	thermocouple leads				thermocouple leads
					Red White
			Ground
		Red White leads
					Shielded
					ground lead

Left

Terminal

Block

High Limit

Control

Module

To temperature		To ground
controller	terminal on temp
		controller

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