Groen 2TRI-RES-20G, Руководство по обслуживанию

Страница: 25 / 44

PART NUMBER 152797 REVISION A
CALL 888-994-7636 FOR TECHNICAL SUPPORT 25 CALL 888-994-7636 FOR TECHNICAL SUPPORT 25
DIAGNOSTIC CHECK OF SYSTEM
ENTER DIAGNOSTICS 1.
Push STEAM, COMBO, OVEN, and CLEAN all at the same time (it
takes two hands).
The display says DIAgNOSTICS EXIT. Rotate the TIMER knob
(the lower knob) clockwise. The names of the various diagnostic
tests appear in the second line of the display. It’s usually best to
execute the tests in order.
RTD TEMP 2.
The value shown in the red TEMPERATURE display is the
temperature in degrees F measured by the RTD sensor in the
oven cavity.
If the oven is at room temperature then the display will indicate
approximately that temperature.
If the oven has recently been used then the indicated temperature
will be considerably higher.
RTD VOLTAGE 3.
This test checks for a shorted or open RTD.
The value displayed is approximately 20% of the RTD voltage in
millivolts.
At room temperature the display should show approximately
110.
At 450 degrees the display should show approximately 180.
This is the normal operating range for the RTD.
If the RTD is shorted (pinched wires) the display will show a value
around zero.
If the RTD is open or disconnected the value will be above 900.
LOCAL TEMPERATURE 4.
This test checks for deficient airflow thru the control panel
housing.
There is a temperature sensor mounted on the control board
right behind the control panel.
If the cooling air flow thru the control panel housing, from bottom
to top, is good then the temperature sensor should measure
room temperature, approximately 70 on the display.
If the air inlet at the bottom of the housing becomes plugged or
if the internal muffin fans fail then the air temperature around
the control board will rise.
If it rises to 180 degrees F, the danger temperature, the display
will read 138.
BUTTON 5.
This test checks all the control panel buttons.
Push all the buttons, one at a time.
When the buttons are pushed the associated LED lights.
If the LED stays lit after the button is released it usually means
the plastic panel overlay is keeping the button pushed in.
The START button also tests the beeper.
The CANCEL button turns off the backlight on the text display.
FIRMWARE 6.
This test displays the current firmware version in the
TEMPERATURE display. It should be 2.28 or greater.
SHUTDOWN 7.
This test checks the latching relay circuitry on the relay board.
Turn the oven on by pushing the ON switch.
Push START to unlatch the relay and listen for the faint click as
the relay and pilot valve release.
Push START again and notice that there is no click this time since
the relay is already released. Push the ON switch and listen for
the faint click as the relay and valve pull in.
Leave the power switch on.
LIGHT 8.
This test checks the lights in the door.
Push START.
All the lights in the door should light.
Replace the ones that are burned out.
MUFFIN FAN 9.
This test checks both muffin fans on the right side of the oven.
Push START.
Both muffin fans should operate.
If not check the connections and replace the inoperative fan.
FAN HI 10.
This test checks the cavity fan at high speed.
Push START.
The fan should run at high speed.
If it doesn’t check the connections and the fan motor.
FAN LO 11.
This test checks the cavity fan at low speed.
It is similar to the previous test.
troubleshootIng