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THERMOSTAT
The thermostat is composed of thermo-rod, shaft, contacts
etc. The oven cavity temperature is sensed through a pushed
hole provided at the cavity rear by means of the thermo-rod.
Furthermore, the oven cavity temperature can be preset
by turning the temperature control knob to a desired
position.
Setting temperature range : 4O"C, 90°C to 250°C
Thermostat contacts connected to sheath heater, convection
motor and heater lamp.
1. During cook cycle:
The thermostat contacts close and above components
are energized.
2.
During hold temperature:
-.
When the cavity temperature reached the preset degree,
the thermostat contacts open and close again several
minutes later to thereby maintain the cavity tempe-
rature at the preset degree as shown in Figure 9.
Thermostat
contacts repeat ON-OFF operation by
action of the thermo-rod so that they open at the
moment, when the oven cavity temperature reached
the preset degree, and close again several minutes later
to thereby maintain the cavity temperature
at the
preset degree as shown in Figure 9.
Setting temperature
(9OOC to 25OOC)
Tembrature
into o&n
kvity
I
I
'
'
:
'
,
f----~~~~
I
:
I
'
(40°C 1
SHEATHHEATER
and HEATER
LAMP
*
I ON
I
,
;
I
I
I
Time&--
I
I
I
' '
i
;
I
t
I
'
I
I
'
;ONi
jONi
!ON
SHEATHHEATER
CONVECTION
MOiOR;
oFF
';
oFF
"w"
oFF
OWN OFF
and HEATER
LAMP
Function of Thermostat
This thermostat actuates their contacts by changing the
pressure of oil filled in a capillary tube according to tempe-
rature rise.
Clockwise turn (High Temp.) of the temperature control
knob will expand gap-A and anticlockwise turn (Low
Temp.) of the same will reduce gap-A, as shown in Figure
10.
Normally, contact is in ON position.
With cook, oil temperature in the thermo-rod rises and
the oil is pressurized by capillary tube.
When the cavity temperature reached the preset degree,
the boss pushes the depressor by pressure from the
capillary tube to thereby turn the contacts to OFF
position.
When the oven cavity temperature comes down below
the preset degree, the oil pressure is reduced and the
depressor returns to its original position to thereby
turn the contact to ON position.
ON-OFF operation of the contacts is repeated till
cooking time elapses to "0".
/ 6°C
Fixed
THERMO-
STAT
Temperature
control shaft
Movable contact
plate
Figure 9.
Figure 10. Thermostat Function
17
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