Van Air Systems D8 - Manual (Page 4)

PAGE 4
SECTION 2 INSTALLATION
FIGURE 4 DRYER DIMENSIONAL DETAILS
MODEL
NO.
D 4
D 8
APPROX
WEIGHT
w/o Desiccant
30 LBS
60 LBS
A
27-3/4"
704.9mm
35-1/16"
890.6mm
C
22-7/16"
569.9mm
28"
711.2mm
D
19-5/16"
490.5mm
21-3/4"
552.5mm
E
6-1/2"
165.1mm
10-5/8"
269.9mm
F
4-1/2"
114.3mm
8-5/8"
219.1mm
G
3/4" NPT
3/4" NPT
B
6-15/16"
176.2mm
9-1/2"
241.3mm
H
1-3/8"
34.9mm
1-9/16"
39.7mm
J
5-1/8"
130.2mm
5-1/8"
130.2mm
SECTION 3 OPERATION
3.1 START UP PROCEDURES
Close the inlet isolation valve and open the bypass valve.
Open the outlet isolation valve SLOWLY and allow some air to bleed
through the drain valve; then close the drain valve. When the dryer
reaches normal operating pressure, SLOWLY turn the inlet valve to full
open position; then close the bypass valve.
If the vessel was installed without the bypass or isolation valves,
SLOWLY pressurize the air system. Allow some air to bleed through the
drain valve. Once the vessel starts to pressurize, the drain valve can be
closed.
Close the bypass valve, the dryer is now on stream.
CAUTION
Make sure that the dryer is not subjected to sudden flow
surges. Always open the valves slowly to permit gradual
equalization of pressure between the dryer and the air supply
lines.
3.2 OPERATING THE DRYER
The simple design of the single tower dryer allows for easy
operation.
The dryer requires two procedures to ensure peak performance.
3.2-A DAILY DRAINING
The accumulated solution in the bottom of the dryer should be
drained at least once for every 8 hours of operation. Depending
upon actual operating conditions, the dryer may require draining
on a more frequent basis.
If an automatic ball valve type drain valve was installed on the
dryer, set the time cycle for every 4 to 8 hours. The manual drain
valve must be opened at least once every 4 to 8 hours to drain the
dryer.
CAUTION
If the dryer is not drained regularly, it may become
flooded. Accumulated liquid may enter the air system
and cause damage to downstream equipment.