Van Air Systems FR-1600 - Manual (Page 8)

PAGE 8
OPERATION SECTION 6
FIGURE 6B CONTROL BOX DOOR
FIGURE 6C DRYER TIMING CHART
= ON
6.4 DRYER CONTROLS
The control is housed in a NEMA 4X enclosure and it has the following
features:
- Power switch
- Power On light
- Fail to Switch light
- Alarm Reset pushbutton
- Hour Meter
See Figure 6B for control box door.
6.4-1 SMART RELAY:
The dryer cycle is controlled by a SmartRelay, two solenoid valves
and two pressure switches. The dryer timing chart is shown in FIG-
URE 6C. The SmartRelay has a battery back-up that will hold the
program in memory safely for 2 years.
6.4-3 HOUR METER:
The Hour Meter is located on the front of the control box. It is used
to log the total number of hours that the Prep-40 dryer system has
been in operation.
6.4-2 SWITCHING FAILURE:
When there is a switching failure (failure of control solenoid valves
SV1 & SV2; failure of exhaust valve to open; or clogging of exhaust
muffler), the Fail to Switch LED will be lit. This will energize the
Alarm Contacts shown in FIGURE 10D. The contacts can be wired
for remote annunciation. To reset the Switching Failure Alarm press
the Alarm Reset Pushbutton on the front of the control box. If the
condition causing the alarm is not corrected, the alarm will
re-activate in 90 seconds.
6.5 PDV-500T
The PDV-500T drain valve is an automatic drain valve tubed to the
separator/prefilter to automatically drain liquid water from the filter.
Reference PDV-500T manual attached.