Middleby Marshall PS360 Appendix - Instructions for Service Kits 33984 and, Left, Right, Block

SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kits 33984 and 33985 -

Oven Thermocouple Kit, 11/01

NOTE: This configuration shows leads for three t e m p e r a t u r e - s e n s i n g thermocouples - two on the left side, and one on the right. Ovens with only two t e m p e r a t u r e - s e n s i n g thermocouples will have a single set of leads on the left terminal block, instead of the two sets that are shown.

Figure 14a

Thermocouple Wiring - PS570S (Late) - Left to Right Conveyor

Left	Ground	White	Red	Red	White	Ground	Red	White	Right
Terminal	leads	(temp)	(temp)	(temp)	(temp)	leads (all)	(hi lim)	(hi lim)	Terminal
Block									Block

	To ground	To temperature	To temperature	To ground	To mounting screw	To high limit
			controller			control module
terminal on temp		controller		terminal on temp	for high limit
	controller			controller	control module

NOTE: This configuration shows leads for three t e m p e r a t u r e - s e n s i n g thermocouples - two on the right side, and one on the left. Ovens with only two t e m p e r a t u r e - s e n s i n g thermocouples will have a single set of leads on the right terminal block, instead of the two sets that are shown.

Figure 14b

Thermocouple Wiring - PS570S (Late) - Right to Left Conveyor

Left	White	Red	Ground	White	Red	Red	White	Ground	Right
Terminal	(hi lim)	(hi lim)	leads (all)	(temp)	(temp)	(temp)	(temp)	leads	Terminal
Block									Block

To high limit			To temperature
	To mounting screw	To ground		To	temperature		To ground
control module			controller
	for high limit	terminal on temp		controller		terminal on temp
	control module	controller					controller

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 14. The thermocouples should be wired to the terminal block inside the blower motor compartment closest to the thermocouple.

IMPORTANT

As you wire the thermocouples, check that ground leads run from the terminal blocks inside the blower motor com- partments to BOTH the temperature controller AND the high limit control module, as shown in Figure 14.

If the ground leads to the front compartment of the oven are NOT present - for example, on an oven that previ- ously used the older-style 2-lead or 4-lead thermocouples

-it is acceptable to use a single chassis ground wire to the mounting screw for the terminal block. See Figure 15.

A good ground connection for the thermocouple’s uninsulated lead is REQUIRED for proper operation!

7.If you will be replacing additional thermocouples, re- peat Steps 2-6 as necessary.

8.Use the kit-supplied nylon clamp and #10-16 x 3/4” screw to secure the thermocouple leads so that they will clear the shrouds, blower belts, and pulleys.

9.Close the machinery compartment and blower motor compartment doors. Replace all shrouds onto the oven.

Figure 15

Alternate ground lead wiring

Use ONLY if ground leads to front compartment are not present.

White		Red	Ground	White	Red
(hi lim)	(hi lim)		leads (all)	(temp)	(temp)

	New chassis
	ground wire	To high limit	To temperature
11	control module			controller

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