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FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION
F24682 (Rev. B, October 2007)Page 45 of 68
A. Contacts 1 & 3 close, timer motor is
energized and timing DOWN begins.
3. Time expires on Roast & Hold timer.
A. Contacts 1 & 3 open, timer motor is de-
energized and timing stops.
B. Contacts 1 & 4 close.
1) If the oven was heating, then the gas
burner and heat light go out; If the
oven was not heating, then the gas
burner and heat light remain out.
NOTE: The Temperature control board
remains powered and the internal relay
contacts remain closed as long as oven
cavity temperature is below the 175°F
minimum set point temperature of the
board and power is ON.
2) Power is connected through function
switch (S3) --- Hold relay (R2) is then
energized, R2 contacts change state
and the normally open (N.O.) contacts
close.
a. Power to one side of hold
thermostat.
NOTE: When temperature is above
160°F (±12) the hold thermostat
contacts are open.
3) Motor speed relay (R1) de-energized,
(R1) contacts change state and the
normally open (N.O.) contacts OPEN.
a. Convection fan motor stops and
centrifugal switch (N.O.) on
motor OPENS.
a) Heat relay (R3) de-
energized, relay (R3)
contacts open and oven
heating stops.
NOTE: This is considered
second stage cooking in the
ROAST & HOLD cycle where the
stored heat in the oven continues
to cook the product.
4. Oven temperature falls below 160°F (±12) and
hold thermostat contacts close.
A. Heat light comes ON.
B. Motor speed relay (R1) is energized, (R1)
contacts change state and the normally
open (N.O.) contacts CLOSE.
1) Convection fan motor energized (fan
speed low).
C. Power is also applied to one side of the
centrifugal switch on the convection fan
motor through the temperature control
internal relay (N.O.) contacts.
D. When the convection fan motor reaches
operating speed, the centrifugal switch on
the motor closes.
1) Heat relay (R3) is energized.
a. Heat relay (R3) contacts (N.O.)
close and the heating circuit is
powered.
a) Ignition module is
energized.
b) No ignition light (red) comes
ON, module performs a self
diagnostic test for 4
seconds, 2nd valve (main)
on the gas valve is
energized. Gas starts to flow
to the burner, sparking
begins, the NO IGNITION
light goes out and burner
lights. Sparking continues
for up to 7 seconds or until a
flame is established. If a
flame is SENSED, the NO
IGNITION light stays out
and burner remains lit.
If a flame is not SENSED
after 7 seconds of sparking,
the NO IGNITION light
comes back on, 2
nd
valve
(main) on the gas valve is
de-energized and gas flow
to the burner stops. Ignition
trial cycle repeats after a 15
second purge between
cycles for two additional
tries before locking out. To
reset after a lockout, turn
power switch (S1) OFF then
ON.
5. Oven reaches the FIXED hold temperature and
hold thermostat opens.
A. Heat light goes out.
B. Power removed from heat relay (R3) and
the contacts open (N.O.).
1) Ignition control module de-energized.
a. Power removed from 2
nd
valve
(main) on the gas valve and gas
flow to the burner stops.
C. Power is also removed from motor speed
relay (R1).
1) Convection fan motor de-energized
and fan stops rotating.