SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kits 33984 and 33985 -

Oven Thermocouple Kit, 11/01

PS360 Series front-mounted thermocouple inside the machinery compartment

These thermocouples are mounted in a tube that extends diagonally up and into the plenum chamber. They are se- cured in place by a set screw located on the mounting tube, and by a bead of high-temperature silicone around the end of the shaft.

The new thermocouple will be held in place in the same manner, except that the silicone should be applied so that it wraps around the edges of the thermocouple’s mounting flange.

NOTE FOR HIGH LIMIT THERMOCOUPLES: PS310/360 electric ovens have two thermocouples inside the machinery compartment. One thermocouple is con- nected to the temperature controller, while the other is connected to the high limit control module.

The thermocouple supplied in this Kit is incompatible with the early United Electric Type 54 and Type 55 high limit control modules used on these ovens. If the oven is equipped with one of these control modules, it will be necessary to upgrade the control unit to the current Watlow model (shown in Figure 6) before the thermo- couple can be replaced. Service Kit 39733 includes all

Figure 5

Thermocouple Installation - PS360 Series

Machinery Compartment

Thermocouple

Set

screw

High-temperature

silicone wraps around thermocouple flange and onto mounting tube

Plenum

wall

Mounting

tube

Figure 6

Thermocouple Wiring - PS360 Series

parts and instructions needed for the conversion. Refer to Service Bulletin MM-168 (5/7/99) for details.

1.

Remove the silicone seal around the end of the thermo-

 

couple. Loosen the set screw.

2.

Pull the thermocouple out of its mounting tube. Care-

 

fully thread the wiring out of the oven and discard the

 

thermocouple.

3.

Check that the silicone has been removed completely

 

from the end of the mounting tube. Any remaining sili-

 

cone can interfere with the correct placement of the

 

new thermocouple.

4.

Insert the new thermocouple until its flange is seated

 

on the end of the mounting tube. See Figure 5.

5.

Tighten the set screw until the thermocouple is secure

 

inside the tube. AVOID OVERTIGHTENING THE SET

 

SCREW TO PREVENT DAMAGE TO THE THERMO-

 

COUPLE.

White

Red

Shielded

ground lead

Analog

Temperature

Controller

Digital

Temperature

Controller

Shielded

White Red ground lead

Red White

6.Use high-temperature silicone to seal the flange to the mounting tube, as shown in Figure 5. Check that all holes and spaces are filled by the silicone. This not only helps to hold the thermocouple in place, but pre- vents heat from entering the machinery compartment.

7.Route the wiring for the new thermocouple through the hole in the side of the electrical control box by using the existing wiring bundle. Check that the leads are clear of the ignition cable and all components.

8.Connect the leads as shown in Figure 6.

Shielded

ground lead

High Limit

Control

Module

4

59

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Middleby Marshall PS570, PS360, PS200, PS555, PS220, PS224 PS310 manual Analog Temperature Controller Digital
Page 59 Page 61

PS224 PS310, PS220, PS555, PS200, PS360 specifications

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