Middleby Marshall PS224 PS310, PS570 Appendix - Instructions for Service Kits 33984 and, wall

SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kits 33984 and 33985 -

Oven Thermocouple Kit, 11/01

PS360 Series rear wall thermocouples - before 2/96, serial numbers before ASH-0001

Thermocouples on these ovens are located on the rear wall of the baking chamber. They are secured in place by a clamp on the outside of the oven.

This Kit eliminates the clamp. The flange of the new ther- mocouple is held to the back wall of the oven by a retaining plate, as shown in Figure 3.

1.Loosen the retaining clamp and pull the thermocouple straight out. Disconnect the thermocouple leads. Care- fully thread the wiring out of the oven and discard the thermocouple.

2.Remove and discard the cable clamp.

3.Slide the new thermocouple into the mounting tube until the flange is seated firmly on the back wall of the oven.

4.Install the kit-supplied retaining plate (P/N 41687) as shown in Figure 3.

5.Fasten the attachment plate to the back wall of the oven using the two kit-supplied #10-16 x 3/4” self-tap- ping screws. Ensure that the thermocouple flange is securely trapped between the plate and the rear wall of the oven.

6.Route the wiring through the grommet hole and into the machinery compartment. Check that the leads are clear of all components, PARTICULARLY THE BLOWER MOTOR, by using the existing wiring bundles.

7.Connect the leads as shown in Figure 4.

8.Attach the kit-supplied nylon clamp and #10-16 x 3/4” screw to the rear of the oven. The clamp should be positioned to support the thermocouple leads away from the flue pipes and vent openings.

PS360 Series rear-wall thermocouples - 2/96 or later, serial numbers after ASH-0001

Thermocouples on these ovens are mounted directly to the back wall of the oven using a single retaining screw. It should be possible to simply replace the existing thermo- couple using the original mounting hardware.

To replace the thermocouple:

1.Remove AND RETAIN the screw that holds the thermo- couple in place on the rear wall.

2.Disconnect the thermocouple leads. Carefully thread the wiring out of the oven and discard the thermocouple.

3.Slide the new thermocouple into the mounting tube until the flange is seated firmly on the back wall of the oven.

4.Fasten the thermocouple to the back wall of the oven using the original mounting screw. Then, perform Steps 6-8 of the preceding section to wire the thermocouple.

Figure 3

Thermocouple Installation - PS360 Series

	Clamp (remove
	and discard if
	present)
	Mounting
	tube
Thermocouple	(welded to
	plenum)
	Thermocouple
Plenum	flange
wall
	Oven
	wall
	New	Retaining
	thermocouple
		plate

#10-16 x 3/4”

mounting screws (2)

Figure 4

Thermocouple Wiring - PS360 Series

Digital Temperature Controller

White

Red

Shielded ground lead

Analog Temperature Controller

		Shielded
White Red	ground lead

3

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