Middleby Marshall PS555 Oven Thermocouple Kit, Instructions for Service Kits P/Ns 33984 and, Page

SECTION 3 - SERVICING COMPONENTS

D. Appendices Appendix - Instructions for Service Kits 33984 and 33985 - Oven Thermocouple Kit, 11/01

Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • USA • (847) 741-3300 • FAX (847) 741-4406

Instructions for Service Kits P/Ns 33984 and 33985

Oven Thermocouple Kit

This Service Kit provides the parts and instructions necessary to replace one temperature-sensing or high limit thermo- couple in any of the following Middleby Marshall oven models:

•	PS200 Series uses Kit P/N 33985	•	PS536 uses Kit P/N 33985	• PS570 uses Kit P/N 33984
•	PS360 Series uses Kit P/N 33984	•	PS555 uses Kit P/N 33984

These instructions include replacement procedures for ovens built with the current flanged thermocouple, AND for ovens built with the obsolete thermocouple without a flange (P/N 28071-0001).

KIT CONTENTS - KIT P/N 33984			KIT CONTENTS - KIT P/N 33985
P/N	Qty.	Description		P/N	Qty.	Description
33812-1	1	Thermocouple, type J, 6” L	33812-2		1	Thermocouple, type J, 13-3/8” L
B301A8861	2	Screw, hex wshr hd #6 x 3/8”		B301A8861	1	Screw, hex wshr hd #6 x 3/8”
21292-0001	3	Screw, hex wshr hd #10-16 x 3/4”	34701		1	Instructions
27276-0001	1	Cable clamp, nylon
41687	1	Attachment plate, PS360 rear thermocouple
34701	1	Instructions

IMPORTANT - READ THIS BEFORE YOU BEGIN!

The thermocouple in your Kit has three leads:

•The red and white leads connect directly to the thermocouple terminals on the oven’s temperature controller (or high limit control module, as appropriate), or to a local terminal block that in turn is connected to one of these units.

•The uninsulated lead is a ground wire for the thermocouple’s protective sheath. The ground connection helps to drain any radio-frequency disturbances from the thermocouple before the signal enters the temperature controller or high limit control module. For a temperature-sensing thermocouple, the ground lead MUST be connected to the ground terminal on the temperature controller. For a high limit thermocouple, the ground lead should be connected to a chassis ground or to the mounting screw for the high limit control module.

Some early thermocouples may have either two or four leads:

•The two-lead thermocouple is simply an earlier version of the current model, without the ground lead. When replacing a two-lead thermocouple, it will be necessary to connect the new ground lead.

•The four-lead thermocouple is actually a dual-function unit which sends its signal to both the temperature controller and the high limit control module. Current ovens use separate thermocouples for these functions. When replacing a four-lead thermocouple, it will be necessary to use a SECOND KIT to install the high limit thermocouple. In addition, any oven equipped with these early thermocouples should have all of its thermocouples updated at the same time. For a PS570 or PS570S oven, this will require THREE THERMOCOUPLE KITS - two for the existing thermocouples, and one for the new, separate high limit.

Oven Model	Page
PS200 Series - before 2/96, serial numbers before ASH-0001	........... 2
PS200 Series - 2/96 or later, serial numbers after ASH-0001	2
PS360 Series rear wall thermocouples - before 2/96, serial
numbers before ASH-0001	3
PS360 Series rear wall thermocouples - 2/96 or later, serial
numbers after ASH-0001	3
PS360 Series front-mounted thermocouples inside the
machinery compartment	4
PS536	5

Oven Model	Page
PS555 Gas - rear wall thermocouples with screw terminal
connections (no terminal blocks)	8
PS555 Electric and PS555E	9
PS570 (X01-X05 name plate ID numbers) and PS570S
(early) with side-mounted thermocouples inside or outside
the blower motor compartments	10
PS570S (late) - rear wall thermocouples with left-side AND
right-side terminal block connections	12
PS555G and PS570G - rear wall thermocouples with
left-side terminal block connections	14

WARNING

BEFORE PERFORMING ANY SERVICE WORK, THE ELECTRICAL POWER SUPPLY AND THE GAS SUPPLY MUST BE TURNED OFF.

1 P/N 34701 • Rev. C • V1 • 11/01

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