Operation 3-3
January 2006
Operating the 4x40 
Optica
The parameters chosen during programming are displayed 
numerically on the top three lines of the display. For programming, 
see Chapter 5. A typical 4x40 display screen is shown below. The 
system status is shown in the lower left, and the balance indicator is 
shown in the lower right.
Figure 3-2: Typical 4x40 Display Screen
The balance indicator should show about five to seven blocks in 
normal operation. If it shows fewer than four or more than eight, the 
dew point sensor may need to have its optics signal level adjusted 
(see Figure 3-3 below and Balancing the Sensor Optics on page 7-2).
Figure 3-3: Possible Balance Indicator Displays
Network Operation The VGA Optica can be operated and programmed remotely over a 
network. Networked operation is very similar to operation using the 
front panel. For programming from a network, see Chapter 6. A 
typical network screen is shown in Figure 3-4 below.
Figure 3-4: Typical Network Screen
Control
Tmp  ° C  25.355
%RH  10.3
Tdew  ° C  8.47996 Heat
Pacer
Cool
well-balanced
Sensor not
Cool
Pacer
Heat
Sensor not
well-balanced
Sensor
balanced
Pacer
Cool
Heat
Cool
Pacer
Heat