OPERATION
2-14
HUMIDAIRE - 1846 REV M
Component Reference
NOTE: Refer to FIGURE 7 page 2-16 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. COOK TIMER
3. DOOR SWITCH
4. TEMPERATURE CONTROL BOARD
5. SPDT BLOWER SWITCH
6. SINGLE SHOT TIMER
7. SPST THERMAL SWITCH
8. TEMPERATURE PROBE
9. POTENTIOMETER
10. COOK LIGHT
11. ELEMENT CONTACTOR
12. HEATING ELEMENTS
13. 50 WATT LAMPS
14. LIGHT SWITCH
15. TIMER MOTOR
16. BUZZER
17. STEAM DURATION POTENTIOMETER
18. STEAM CYCLE START SWITCH
19. WATER SOLENOID VALVE
20. STEAM LIGHT
21. CONVECTION FAN
22. AXIAL COOLING FAN
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to terminal #1 of the
cook timer (2), one side of the door switch (3),
terminal #8 of the temperature control board
(4) and the axial cooling fan (22)
2. If the doors are closed the door switch (3) should
also be closed sending power to terminal #6 of
the temperature control board (4), the SPDT blowĆ
er switch (5), terminal #1 of a single shot timer (6),
and one side of a SPST thermal switch (7).
3. On a call for heat from the temperature control
circuit a circuit is completed between terminals
#6 and #7 of the temperature control board (4).
NOTE: The temperature control circuit conĆ
sists of the temperature probe (8), the
temperature control board (4) and the
solid state potentiometer (9).
Power is sent out of terminal #7 sending power
to the cook light (10) and one side of the eleĆ
ment contactor (11). When the contactor
closes the heating elements (12) power up.
4. The 50 watt lamps (13) only receive power when
the light switch (14) is activated. These lamps
are 115 volt and are wired in series parallel.
5. When the cook timer (2) is set for a time a cirĆ
cuit is made between terminals #1 and #2
powering up the timer motor (15). At the expiĆ
ration of the set time the switch in the cook timĆ
er (2) toggles from 1-2 to 1-4 powering up
the buzzer (16).
NOTE: Put the timer in the home position to siĆ
lence the buzzer.
6. If the oven is above 212_F (100_C) as sensed by
the thermal switch (7) the switch closes sending
power to the steam cycle start switch (18).
NOTE: The thermal switch is located in the
rear of the oven. The face of the thermal
switch is in contact with the oven liner.
The switch toggles closed if the oven
temperature exceeds 212_F (100_C).
NOTE: The steam cycle start switch is a moĆ
mentary switch located on the front
control panel.
When the steam duration potentiometer (17) is
set and the steam cycle start switch (18) is
pressed the single shot timer (6) is activated for
the duration of time on the steam duration poĆ
tentiometer. This allows the water solenoid
valve (19) to open spraying atomized water
onto the blower wheel. The steam light (20) is
illuminated during the humidaire cycle.
7. The convection fan (21) receives power from
the SPDT blower switch (5). This switch deterĆ
mines hi and lo speed.
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 7.
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