Middleby Marshall PS224 PS310, PS570 High Limit Conversion Kit for PS300, 310, 350, & 360 Ovens

SECTION 3 - SERVICING COMPONENTS

D. Appendices	Appendix - Instructions for Service Kit 39733 -
	High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99

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

Instructions for Service Kit 39733

High Limit Conversion Kit for PS300, 310, 350, & 360 Ovens

KIT COMPONENTS - Check that the kit includes ALL of these parts BEFORE you begin!

Qty.	P/N	Description	Qty.	P/N	Description
1	39732	Instructions	2 ft./610mm	27152-0050 Wire, #18 AWG, brown
1	34982	Watlow high limit control module	2 ft./610mm	27152-0053 Wire, #18 AWG, white
1	30693	Reset switch w/ lighted pushbutton	2 ft./610mm	27152-0054 Wire, #18 AWG, purple
1	35634	Mounting bracket, reset switch	8	1455A8750	Wire connector, 1/4”/6.4mm
1	35691	Wire set, reset switch (includes 4	1	3002693	Wire tie, nylon
		wires and 3 1/4”/25mm connectors)	2	2000076	Screw, 6-32 X 1-5/8”
1	33812-1	Thermocouple, type J, 6”/152.4mm	2	1421B8803 Screw, 6-32 X 1/4”
1	39690	Mounting sleeve, thermocouple	4	2001327	Nut, 6-32

TOOLS REQUIRED

•Drill with 3/16” drill bit

•Middleby Marshall Thermocouple Signal Source Generator (P/N 27170-0192)

•Wire cutters/strippers

A. OVERVIEW

This Service Kit is used to replace two different types of United Electric high limit/cooldown controllers with a Watlow high limit controller for PS300, 310, 350, and 360 Ovens. See Figure 1.

•The early (Type 54) United Electric control was ONLY equipped with a high limit circuit. Ovens equipped with this control did NOT have a cooldown circuit. This control was used on the following models:

-PS300/350 Gas (early)

-PS300/310/350/360 Electric (early - all voltages)

For these ovens, the kit directly replaces the Type 54 high limit control with the Watlow high limit con- trol.

•The later (Type 55) United Electric control was equipped with BOTH high limit and cooldown circuits, and was used on the following models:

-PS300/310/350/360 Electric (late), 208/240V and 480V UL versions ONLY

For these ovens, the kit replaces the Type 55 con- trol with the Watlow high limit control, and uses the oven’s temperature controller to provide the cooldown circuit.

Figure 1

United Electric Type 54

High Limit Control

United Electric Type 55

High Limit/Cooldown

Control

Lighted Reset

Switch

Watlow High

Limit Control

	P/N 39732
Page 1 of 8	Rev. B • V1 • 5/99

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