Van Air Systems D2 User Manual

March 2009

P/N: 432-00159-B

INSTALLATION INSTRUCTIONS

SINGLE TOWER DRYER MODEL D-2

®

VAN AIR PAR T NUMBER: 80-0104

PRODUCT PURPOSE & FUNCTION:

Van Air's Single Tower (Delinquescent) Dryer model D-2 is designed to remove water vapors from compressed air systems
in low flow applications. The housing is made of lightweight cast aluminum and coated with an epoxy powdercoating for corrosion
resistance. A PVC plastic support grid promotes efficient drying and drainage. A sight glass window provides a visual indication for
when to add more Dry-O-Lite desiccant.

FIGURE 1 SPECIFICATIONS

1/2" NPT
OUTLET

(PORT A)

STEM &

GRID

1/2" NPT
INLET
(PORT B)

DRY-O-LITE
DESICCANT

1/4" BALL
VALVE

OPERATING CONDITION

MAXIMUM
WORKING
PRESSURE

200 PSIG 35-100°F 4 LBS 2LBS

INLET
TEMP
RANGE

HOUSING
WEIGHT

APPROX.
DESICCANT
REQUIRED

HEAD

CLAMP

SIGHT
GLASS

BOWL

5-1/2"

3-1/2"

FILL

LEVEL

LOW

®

3-5/8"

LEVEL

FLOW CAPACITIES

200

175

150

125
100

75

50

25

OPERATING PRESSURE (PSIG)

1234567891011121314

FLOW CAPACITIES (SCFM)

5-1/2"

11/16"

12-1/4"

13-7/16"

1-3/16"

WARNINGS

READ INSTRUCTION CAREFULLY BEFORE INSTALLING DRYER.

•

DO NOT REPLACE ANY ITEM ON DRYER UNTIL DRYER IS COMPLETELY DEPRESSURIZED.

•

DO NOT OPERATE DAMAGED OR LEAKING DRYER, REMOVE FROM SERVICE IMMEDIATELY.

•

DO NOT OPERATE ABOVE MAXIMUM WORKING PRESSURE (MWP) AND/OR MAXIMUM OPERATING TEMPERATURE (°F).

•

TAKE PROPER SAFETY PRECAUTIONS FOR THE GAS BEING PROCESSED.

•

PAGE 1

INSTALLATION

The ability of a dryer to provide dry compressed air is
dependent on the correct location of the unit. Temperature and
pressure are the keys to selecting the proper location.

IMPORTANT

ALWAYS PROCESS AIR THROUGH THE DRYER AT THE
LOWEST POSSIBLE TEMPERATURE AND THE HIGHEST
PRACTICAL PRESSURE.

INLET AIR TEMPERATURE

The dew point of the outlet air is directly related to the inlet air
temperature. The lower the inlet temperature, the lower the dew
point of the outlet air. Determine the lowest ambient temperature
where the compressed air is used or where the lines are located.
Install the dryer where the inlet temperature will not be more than
10°F above the lowest system operating temperature, do not
exceed 100°F inlet air temperature.

CAUTION

NEVER LOCATE THE DRYER IN AN AREA OF EXCESSIVE
HEAT. THE INLET AIR TEMPERATURE SHOULD NEVER
EXCEED 100°F.

OPERATING PRESSURE

More air can be processed through the dryer at higher pressures.
Locate the dryer at the highest practical pressure, but do not
exceed the maximum rated working pressure of 200 PSIG. Refer
to the flow capacity chart on page 1.

PIPING AND ANCILLARY EQ UIPMENT

Check markings on vessel head. Connect inlet pipe to side

4.
marked "B" and outlet to side marked "A". Dryer must be
installed in a vertical and upright position with the bowl below
the head, as shown in Figure 2.
Fill bowl with desiccant (with the stem and grid assembly

5.
inside) until the desiccant reaches the fill line (as shown in
Figure 1).
Place dryer bowl onto head.

6.
Place clamp onto head and bowl and tighten.

7.

ADDING DESICCANT

Close dryer inlet and outlet shutoff valves. Slowly open drain

1.
on bottom of bowl until vessel is completely depressurized.
Grasp bowl in one hand. Loosen clamp with other and slide

2.
clamp down off bowl.
Twist bowl slightly and pull down off of head. The stem and grid

3.
assembly must come loose from o-ring seal in head.
Add desiccant until the fill line is reached (Reference Figure

4.

1).
Position stem on head and push bowl upward so bowl and

5.
head meet.
Hold bowl in place, reinstall clamp and tighten.

6.

START-UP

Close dryer inlet and outlet shutoff valves. Open bypass valve.

1.
Close dryer drain valve. See Figure 2 Recommended Instal­lation
Slowly pressurize dryer by opening dryer inlet shutoff valve.

2.
Open dryer outlet shutoff valve slowly and close bypass valve.

3.

WARNING

MAKE SURE THAT THE DRYER IS NOT SUBJECTED TO
SUDDEN SURGES. ALWAYS OPEN VALVES SLOWLY TO
PERMIT A GRADUAL EQUALIZATION OF PRESSURE
BETWEEN THE DRYER AND THE AIR SUPPLY LINES.

Locate dryer as close as possible to equipment to be pro-

1.
tected.
If large amounts of liquids are present in the air lines, install

2.
a separator with drain valve ahead of the dryer.
Install bypass piping around dryer to facilitate servicing (Ref-

3.

erence Figure 2).

FIGURE 2 RECOMMENDED INSTALLATION

BYPASS VALVE

INLET

PORT B

INLET

SHUTOFF

VALVE

D-2

SHUT DOWN

Close dryer inlet and outlet shutoff valves. Open bypass valve.

1.
Slowly open drain valve to depressurize dryer.

2.

OUTLET
PORT A

OUTLET
SHUTOFF
VALVE

PAGE 2