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KB-5121KS/K/W
PROCEDURE
LETTER
G
SURFACE
Two types of surface elements control systems are
covered in this manual.
1.
Standard infinite switch.
2.
Dual infinite switch.
Standard infinite switch:
The surface elements and standard infinite switches pro-
vide an infinite choice of heat settings for cooking. Con-
trols are safety type and must be pushed in before turn-
ing. All surface controls are marked on the control panel
for their respective heating element. Power is supplied
to the surface elements through the infinite switch con-
tacts L1-H1 and L2-H2. During actual surface element
operation, if the control is set to the high position con-
tacts L2-H2 are lock closed providing continuous power
to the element. In all other setting contacts L2-H2 will
cycle to maintain the correct heat setting. Contacts L1-
P provide power to the surface element indicator light.
Troubleshooting:
There are four ways a surface control system with a
standard infinite switch can fail.
1.
The element does not heat.
2.
The switch does not cycle the element off and
on when set to a position other than high.
3.
The element operates correctly, but the
indicator light does not glow.
4.
Indicator light glows with all infinite switches
in the off position.
NOTE: If the indicator light glows very dimly
with all the switches in the off position. This
problem is caused by a capacitive feed over in
the wiring and can be corrected by connecting
a 100,000 Ohm 1/4 watt resistor in parallel with
the light.
Continuity tests can be performed on the infinite switch
contacts. All tests should be performed with power to
the range disconnected, and wiring removed from the
switch. Set an ohmmeter on R X 1K scale and check
the contacts in the following chart and switch terminal
diagram.
TEST PROCEDURES
ELEMENTCONTROL SYSTEMS
COMPONENT TEST
Contacts
L1 - P
L1 - H 1
L2 - H 2
O
- open
Element does not heat:
Checking the system with a Voltmeter, if the element
does not heat up.
1.
Remove the back of the control panel to
expose the switch terminals.
2.
With a Voltmeter set for AC on a scale higher
than 240 Volts measure the voltage drop
between terminals L1 and L2. If the meter
reads zero the wiring between the main
terminal block on the range and the switch is
open. If the meter reads line to line voltage
(around 240 VAC) go to step 3.
3.
With the switch turned to the high position
measure the voltage drop between terminals
H1 and H2. If the meter reads zero the switch
is defective. If the meter reads line to line
voltage the switch is good. If the range has
standard elements go to step 4. If the range
has a glass smooth go to step 5.
4.
Remove the element and measure the
voltage drop between terminals of the terminal
block. If the meter reads zero the terminal
block or the wiring between the switch and the
terminal block is open. If the meter reads line
to line voltage the element is defective.
NOTE: Always inspect the terminal block for
burnt spots that can cause poor connection.
5.
Raise the top and locate the two terminals on
the element that the wires from H1 and H2 are
on. Measure the voltage drop between the two
terminals. If the meter reads zero the wires
18
Di al Posit ion
OFF
LO-MED
HI
O
X
X
O
X
X
O
X - C
X
X
- closed
P1
4
2
P2
PILOT
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