Forma Scientific, Inc._________________________________________________Operation
4-3
thermoanemometer. Replace the filters if proper airflow cannot be obtained.
The static pressure gauge should not be used as a direct measure of air flow.
f. Blower Speed Control
The blower speed control is accessed from the front of the control panel by removing
the access panel. The blower speed is adjusted by turning the screw on the variable resistor
mounted on the circuit board adjacent to the controller. (Refer to Figure 4-4) Turning the screw
clockwise increases air velocity; counter-clockwise decreases it.
The blower speed is factory set and should only be changed by a qualified
technician.
Live voltage is present on the control terminals of the switches
and dials on the front of the blower panel. Avoid touching these
controls when reaching into the control panel and making any
adjustments.
g. Measuring Blower Motor
Voltage
Both blower motor voltage and line
voltage are measured at the three
terminal connectors at the top of the
circuit board. Refer to Figure 4-5.
h. Blower Motor/Lights Reset
Button (15 Amp)
The reset button (located on
the left side of the control panel,
directly above the Receptacle fuses) is
an inline circuit breaker for the
internal blower motor and lighting. If
an overload occurs, the circuit breaker
will trip, and the button will protrude
from the panel. Depressing the button
resets the circuit breaker.
Figure 4-4
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