ThermoFisher Scientific Wellwash 4, Service Manual

Page: 36 / 156

Chapter 4: Functional Description
Thermo Scientific Wellwash
®
4 Mk 2 User Manual Rev.2.3, Cat. no. 1507340 12
4.1 Controls and indicators
Here is a description of the controls and indicators on the Wellwash 4 Mk 2.
POWER ON/OFF switch
This two-position switch at the rear of the pump unit controls the electrical
power to both the pump and washer units.
PRIME push button
A momentary action switch that starts the PRIME function. An audible tone will
sound when pressed to confirm operation.
PRIME indicator
This yellow LED (light-emitting diode) located to the right of the PRIME button
flashes to indicate that the PRIME function is required and, when continuously
ON, indicates that the washer is primed and ready for use. The indicator will
turn off after a while, but the instrument remains ready for use.
ROW SELECT (1 – 12) push buttons
These are momentary action switches that select the last row to be washed in
any chosen program sequence. An audible tone will sound when pressed to
confirm operation.
ROW SELECT indicators
These yellow LEDs located to the right of the ROW SELECT push buttons, when
illuminated, indicate the rows selected for washing.
START push button
This momentary action switch initiates the wash cycle. An audible tone will
sound when pressed to confirm operation.
RESET push button
When pressed, the RESET button will reset the washer to its pre-programmed
state. An audible tone will sound when pressed to confirm operation.
POWER indicator
This green LED is located at the bottom left of the keypad and, when
illuminated, indicates that the POWER switch is ON.
VAC FAIL indicator
A yellow LED which, when flashing, indicates that the waste bottle is full or that
there is a vacuum failure.
Fig. 4.2 Keypad