SOLID STATE TEMPERATURE
CONTROL TEST
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1.
NOTE:
If right side panel is not accessible, this
component can be serviced by removing the
CONTROL PANEL.
2.
Place a thermocouple in the geometric center of
the oven cavity.
NOTE:
Oven temperature
must
be below 450°F.
3.
Set the temperature control to the maximum
setting.
4.
Check machine data plate for correct voltage to
oven. Refer to diagram below for proper terminal
locations and voltages before checking the
control. Use the correct terminals for the
corresponding voltage.
5.
Turn the ON-OFF-COOL DOWN switch to ON.
Fig. 41
6.
Check for proper voltage across terminalsT1 &
T2 (120VAC) or terminals T1 & T3 (208-240VAC)
for power to the control.
A.
If correct, proceed to step 7.
B.
If incorrect, problem is not with the
temperature control. See
TROUBLESHOOTING.
7.
Check relay voltages on the board:
A.
For 120VAC controls - check across
terminals T4 & T2 for input to the internal
relay and T5 & T2 for output from the internal
relay.
B.
For 208-240VAC controls - check across
terminals T4 & T3 for input to the internal
relay and T5 & T3 for output from the internal
relay.
1)
If input voltage to the internal relay is
correct, proceed to Step 8. If input
voltage to the internal relay is not
present, problem is not with the
temperature control (See
TROUBLESHOOTING).
2)
If output voltage from the internal relay
is correct proceed to Step 8. If output
voltage from the internal relay is not
correct, check temperature probe as
outlined under TEMPERATURE
PROBE TEST
8.
Set the temperature control to the minimum
setting.
NOTE:
Oven temperature must be above 300°F.
9.
Check for zero (0) volts AC across terminals T5
& T2 (120VAC) or T5 & T3 (208-240VAC) for no
output from the internal relay.
TEMPERATURE PROBE TEST
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
NOTE:
The temperature probe used in conjunction
with the Solid State Temperature control is an RTD
(resistance temperature detector) of the Thermistor
type. As temperature increases the resistance value
decreases.
1.
NOTE:
If right side panel is not accessible, this
component can be serviced by removing the
CONTROL PANEL.
2.
Place a shielded thermocouple in the geometric
center of the oven cavity and determine the
temperature in the oven cavity.
3.
Remove the probe lead wires from the solid state
temperature control.
4.
Test the probe with an ohmmeter.
SG SERIES GAS CONVECTION OVENS - SERVICE PRODCEDURES AND ADJUSTMENTS
F45525 (0814)
Page 18 of 31
