Van Air Systems HLSXA-55 - Manual (Page 9)

PAGE 9
6.2 MOISTURE INDICATOR
The moisture indicator is located in the tubing line from the control air
filter. The moisture indicator contains a sight glass window in a fitting
with an indicator strip inside. A sample of outlet air is directed through
the indicator.
The indicator strip will change colors from PINK (indicating wet gas)
to BLUE (indicating dry gas) as the relative humidity changes in the
sample of outlet air.
6.1 DRYER CONTROL
The dryer control is housed in a metal NEMA 4/7 explosion proof
enclosure (Class 1, Div 1, Groups C & D). See FIGURE 6A for control
box.
The dryer control has the following features:
- Power ON Light
- Left Tower Drying Light
- Right Tower Drying Light
- Dryer Purging Light
OPERATION SECTION 6
6.3 OPERATION
The dryer operates in a fixed 10 minute cycle. The dryer changes
towers every five minutes. The dryer goes through a normal tower
changeover sequence (repressurization, tower changeover, depressur-
ization). See FIGURE 6B for dryer timing chart.
FIGURE 6A: CONTROL BOX
FIGURE 6B: DRYER TIMING CHART