OPERATION
2-12
FAN DELAY WITH PULSE PLUS - 18466 REV D
Component Reference
NOTE: Refer to FIGURE 6 page 2-13 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. COOLING FAN
3. TEMPERATURE CONTROLLER
4. 10 MINUTE FAN DELAY TIMER
5. 30 MINUTE COOK TIMER
6. DOOR SWITCH
7. SPDT BLOWER SWITCH
8. CONVECTION FAN MOTOR
9. TEMPERATURE PROBE
10. POTENTIOMETER
11. HOT AIR ELEMENT CONTACTOR
12. COOK LIGHT
13. HOT AIR ELEMENTS
14. REPEAT SHOT PULSE TIMER
15. TPDT RELAY
16. FAN ON LIGHT
17. FAN OFF LIGHT
18. 50 WATT LAMPS
19. LIGHT SWITCH
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to the cooling fan (2), terĆ
minal #8 of the temperature controller (3), and
terminal #1 of the ten minute fan delay timer (4).
2. If the ten minute fan delay timer is in the timed
out position a switch is made between terminals
#1 and #4 sending power to terminal #1 of the
thirty minute cook timer (5). Power is also sent
to one side of the door switch (6). If the doors are
closed the door switch should also be closed
sending power to terminal #6 of the temperature
control board (3) and the common terminal of a
SPDT blower switch (7). The speed of the conĆ
vection fan motor (8) is dependant on the posiĆ
tion of the SPDT blower switch.
3. On a call for heat from the cook temperature
control system a circuit is completed between
terminals #6 and #7 of the temperature conĆ
trol board (3).
NOTE: The temperature control system conĆ
sists of the temperature probe (9), the
temperature control board (3) and the
solid state potentiometer (10)
Power is sent out of terminal #7 to one coil of
the hot air element contactor (11) and the cook
light (12). When the contactor is energized the
hot air element (13) powers up.
4. To enable the pulse plus feature, the ten minĆ
ute fan delay timer (4) must be set to a time. A
switch is then made between terminals #1 and
#2 sending power to terminal #2 of a repeat
shot pulse timer (14).
NOTE: By setting the ten minute fan delay timer
(4) power is interrupted to the thirty minĆ
ute cook timer (5) making it inoperative.
The repeat shot pulse timer cycles a TPDT relay
(15) interrupting the circuit to the convection fan
motor (8). The convection fan motor cycles on
and off for approximately thirty second intervals
for the duration of the time set on the ten minute
fan delay timer (4). The fan on light (16) illumiĆ
nates whenever the TPDT relay closes. The fan
off light (17) illuminates whenever the ten minute
fan delay timer is set for a time.
5. The 50 watt lamps (18) only receive power when
the light switch (19) is activated. These lamps
are 115 volt and are wired in series parallel.
NOTE: Turn the mode selector switch to cool
down to bypass the door microswitch. This
allows the convection fan motor to operate
even when the doors are open.
NOTE: This oven may be converted from single to
three phase, however, contactors must be
changed due to the difference in amp
draw. Reference detail inset in FIGURE 6.
NOTE: The resistive values for the probes used in
this oven have descending temperature
coefficients. As the temperature increases
the resistive values decrease.
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