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FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION
F32700 (February 2006) Page 42 of 64
a. Solid state temperature control
energized. If the oven
temperature is below set point,
the temperature control will
energize its internal relay. The
normally open (N.O.) contacts
close and apply power to the
following components:
a) Heat light (clear) comes ON.
b) Power is connected through
the centrifugal switch
contacts on the convection
fan motor, heat relay (R3) is
energized, (R3) contacts
(N.O.) close and the heating
circuit is powered.
c) Ignition control module is
energized.
d) 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.
4. Oven reaches set temperature.
A. Temperature control de-energizes internal
relay and the normally open (N.O.)
contacts OPEN.
1) Heat light goes out.
2) Power removed from heat relay (R3).
a. R3 normally open (N.O.)
contacts OPEN.
a) Power removed from 2
nd
valve (main) on the gas
valve and gas flow to the
burner stops.
NOTE: This is considered first
stage cooking in the ROAST &
HOLD cycle.
5. The oven will continue to cycle on the
temperature control until one of the following
occurs: ROAST & HOLD time (R & H cooking)
expires which allows the oven to go into Hold
mode; Power switch (S1) is turned to the OFF
or OVEN COOL position or the doors are
opened.
Timer Cycle (Roast & Hold Cooking)
NOTE: The ROAST & HOLD timer operates
independently of the heating cycle until time expires.
Regulation of the oven temperature is then turned
over to the Hold thermostat until one of the following
occurs: ROAST & HOLD timer is turned OFF;
function switch (S3) is turned back to Normal
ROAST (normal cooking) or Power switch (S1) is
turned to the OFF or OVEN COOL position.
1. With the power switch turned ON, power is
supplied to timer.
2. Set ROAST & HOLD timer to desired time
(Roast & Hold cooking).
NOTE: To Roast then Hold the cooked product at a
fixed temperature, the Roast & Hold timer must be
used and the function switch (S3) must also be set to
Roast & Hold as indicated under step1 conditions for
the Roast & Hold cycle.
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.