Middleby Marshall PS528-Series OVENS PS528 (Double) - Manual (Page 20)

16
SECTION 3
OPERATION
II. COMPONENT INFORMATION AND
LOCATION (Figures 3-1 and 3-2)
A. Door Safety Switch
The Door Safety Switch is located at the lower right side
of control panel opening. Opening the control panel door
permits this switch to open, disconnecting power to all
electrical controls.
CAUTION
Do NOT touch the wires going to this safety
switch. Current is always present.
B. Blower Switch
The blower switch has two positions. The switch must be
“ON” or “I” for the main blowers to come on and permit
the oven to run. The fan circulates the air throughout
the oven and must stay on during baking and during the
cool down cycle above 200°F (93°C) to prevent blower
bearing damage. To protect the blower motor and bear-
ings a thermostatic override is built into the oven. If the
temperature inside the oven is over 180°F (82°C) the
main blower will continue to run after the blower switch
is turned to the “OFF” or “O” position.
C. Heat Switch
Turning the HEAT switch to “ON” or “I” will energize the
electric heating system. This switch is in series with the
blower fan motor and high temperature override switch.
Both switches must be closed before the heating elements
an be energized.
D. Temperature Controller
The temperature controller is a solid-state, PID type to
maintain the operator-set temperature. The temperature
controller continuously monitors the oven temperature
and turns on the modulating solid state relay controller.
The heat is on for the time required to maintain a constant
oven temperature.
The temperature controller contains a low-limit switch
which allows the oven to cool down to 200°F (93°C)
before shutting off the blower. A high-limit indication
(ALM 1) will appear on the display if the oven reaches
650°F (343°C).
Figure 3-2. Interior View of Control Console