Metrohm 921 NIRS Vial Heater - Manual (Page 10)

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4. The rear view shows the fan housing,
voltage selection switch and AC power
block. The operating voltage is set at the
factory for the destination country.
The user should verify the correct voltage
setting before connecting to AC power.
This is shown below.
5. Verify that the module is set up for the
correct input voltage. Voltage setting is
indicated by “115 V” or “230 V” showing
on the red selector switch.
The first photo at the right shows the
correct set up for 100…120 VAC
operations. The second photo shows the
correct setting for 220…240 VAC
operations.
To change voltage selection, insert a
small coin or other suitable object into
the horizontal slot and move the selector
switch up for 115 VAC, or down for 230
VAC operation.
Verify the correct setting before
proceeding to the next step.
115 Volt 230Volt