Middleby Marshall PS555 Appendix - Instructions for Service Kit, D. Testing The Installation

SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kit 39733 -

High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99

D. TESTING THE INSTALLATION

22.Remove the thermocouple wires from the “TC +” and “TC -” terminals on the high limit control.

23.Attach a Middleby Marshall Thermocouple Source (P/N 27170-0263) to the “TC +” and “TC -” termi- nals on the high limit control, in place of the thermocouple wires. Note that it may be necessary to attach a pair of terminal connectors to the leads of the Thermocouple Source to allow them to connect to the high limit control’s terminals.

24.Restore the gas supply (if so equipped) and the electrical supply to the oven. Because the control compartment door is still open, pull the door safety switch out into the “service” position.

25.Test the operation of the high limit control as follows:

a.Set the Thermocouple Source to a normal operating temperature, between 200°-600°F (93°-315°C).

b.Turn the oven on, and allow it to heat to 600°F (315°C).

c.After the oven has reached the setpoint temperature, set the Thermocouple Source to 700°F (371°C).

The high limit control is set to open at any temperature in excess of 650°F (343°C). This will shut down the oven’s heat circuit and illuminate the Reset Switch lamp.

26.Set the Thermocouple Source to a temperature setting below 600°F (316°C), and depress the Reset Switch. This should turn off the Reset Switch lamp and restore heat circuit operation.

27.Turn the oven off.

28.If you replaced a UE type 55 controller (with a cooldown circuit), you must set the Thermocouple Source to a temperature setting below 200°F (93°C). Then, wait for the blowers to turn off.

29.Press the door safety switch in to reset it to normal.

30.Remove the Thermocouple Source from the oven.

31.Reattach the thermocouple wires to the high limit control’s terminals as follows:

White wire ................ “TC +” Red wire ................... “TC -”

32.Close the machinery compartment and control compartment access panels, and fasten them in place. The oven is now ready for normal operation.

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