Middleby Marshall PS629G Series, Owner'S Operating & Installation Manual

Page: 25 / 52

SECTION 3
OPERATION
25
SECTION 3
OPERATION
I. CONTROL FUNCTIONS
PS629G-Series Oven Control Functions
WARNING
Possibility of injury from rotating parts and
electric shock.
Never disassemble or clean the oven with the
BLOWER switch or any other oven control
turned “ON” or “I”. Turn “OFF” or “O” and
lockout or tagout all electric power to the oven
before attempting to clean or service this oven.
II. COMPONENT INFORMATION AND
LOCATION
See Figure 24 and Figure 25.
A. Door Safety Switch
The door safety switch is located at the top center 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 must be “ON” or “I” for the main
blowers to come on and to permit the oven to run. The
fan circulates the air through the air fingers and must
stay on during baking. The main blower will continue
to run after the blower switch is turned to the “OFF” or
“O” position if the temperature inside the oven is over
200°F (93°C). To prevent blower motor and bearing
damage, a thermostatic override is built into the oven.
The switch also turns on the rear oven cooling fans to
cool the control components and blower motor . The
cooling fans remain on during the cool down cycle at
control console temperatures above 200°F (93°C).
C. Heat Switch
The “Heat Switch” allows the burner to activate.
Activation is determined by the settings on the
temperature controller.
D. Temperature Controller
The temperature controller is a solid-state, PID type to
maintain the temperature set point. 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. An OVER TEMP LED
lights if the oven reaches 650°F (343°C).