Graco 24M178, 234401 User Manual

Instructions - Parts List

Model 234401 shown

ti22155a

Desiccant Air
Drying System

Model 234401, Series D

Maximum Operating Pressure 160 psi (1.1 MPa, 11 bar)
Maximum Temperature 150° F (65° C)

Model 24M178, Series B

Maximum Operating Pressure 175 psi (1.2 MPa, 12 bar)
Maximum Temperature 150° F (65° C)

Important Safety Instructions

Read all warnings and instructions in this manual.
Save these instructions.

Includes:

309921N

EN

Part No. Series Description

234402 B Stage 1 - Air Filter with automatic

drain. Removes water and con­taminants down to 3 microns.

234397 B Stage 2 - Coalescer with auto-

matic drain. Removes oil and
sub-micronic particles down to
1 micron.

234404 B Stage 3 - Desiccant Housing

Removes uncondensed moisture.

288787 A Self Relieving Air Regulator
288810 A Silica Gel Desiccant (5 lb. can)
288798 A Shut-off Valve

Air

Air Inlet

npt(f)

1/2 in. 1/2 in. 100 175 (1.2, 12)

1/2 in. 1/2 in. 83 175 (1.2, 12)

3/4 in.,
reduced
to 1/2 in.

3/8 in. 1/4 in. 100 160 (1.1, 11)

Outlet

npt(f)

3/4 in.,

reduced

to 3/8 in.

Air Flow Capacity

(CFM)

at 100 psi

(0.7 MPa, 7 bar)

30 175 (1.2, 12)

Maximum Operating

Pressure, psi (MPa, bar)

How Desiccant Air Drying System Works

WET AIR

IN

DRY AI R

OUT

Quick-remove
flange

Built-in screen
prevents desiccant
from going down tube
when refilled

288810 Blue silica gel
desiccant beads turn
pink when saturated.

Element prevents any
desiccant dust from
traveling downstream

Built-in sight glass allows
easy monitoring of desiccant
color change

How Desiccant Air Drying System Works

After the moisture has been removed, the dry air passes
through an element, up the center tube, and out the out­let port. As long as the desiccant is replaced at satura­tion point and your compressed air is not exposed to a
temperature below the dew point, your equipment will
receive dry, moisture-free air.

As the desiccant becomes saturated with moisture, the
dew point begins to rise. This is evident when the desic­cant changes color from blue to pink, indicating the need
for desiccant replacement. Refer to Desiccant Change-
out, page 9.

When air is compressed, the temperature of the air
increases, as does its capacity to hold moisture. As the
hot, moist air travels down through the lines, it cools,
allowing the moisture to condense. Filters, drain traps,
and driplegs only remove liquid condensation. The
Dryaire Desiccant Air Drying System removes liquid
condensation, residual water vapor and aerosols.

As the wet compressed air flows through the inlet port
and down the bed of desiccant, the desiccant beads
absorb the water vapor and aerosols and can reduce
the air humidity down to a -40°F (-40°C) pressure dew
point.

2 309921N

Installation

2

4

6

8

1

1

1

1

2

4

6

8

1

SATURA
TED

NORMA

DESICCANT

¨

2

4

6

8

1

1

1

1

2

4

6

8

1

Membrane air
drying system

Desiccant air

drying system

Ball Valve

Drain Valve

Drain

Leg

Air Control unit
or Air Filter

1/2 in.
(13 mm) drops

Main Air Line

3/4 in. (19 mm) minimum

1-1/4 in. (32 mm) optimum

S

l

o

p

e

s

d

o

w

n

a

n

d

a

w

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e

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e

d

4

i

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.

(

1

1

7

m

m

)

d

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o

p

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n

5

0

f

t

(

1

5

.

2

4

m

)

g

a

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)

Coalescer

Air

Filter

Compressor

Flexible hose
between compressor
and stand pipe

1

5

-

2

0

f

t

.

(

4

.

6

-

6

.

1

m

)

• Main Air Line stand pipe should not be smaller than compressor outlet size.

• A minimum of 25 ft. (7.62 m) from compressor to first filter outlet is required to cool air [50 ft. (15.24 m) optimum]

OR

Main Air

Shut-off Valve

Installation

1. Before installing air line components, blow out the
pipe line to remove debris. Be sure air to the regula­tor is clean. Erratic operation or loss of regulation is
usually caused by dirt in the regulator.

2. Install the Air Drying System as close as possible to
the equipment it serves. Use template 289185, pro­vided, to position system.

Shop Air Piping Layout

3. Install air shut-off valve 288798 upstream from the
air system to isolate it for service.

4. Install system so air flows through filters in the direc­tion noted on top of filter.

5. A minimum 1/2 in. npt piping is recommended.
Avoid using too many fittings, couplings, etc., which
will restrict air flow.

309921N 3

Installation

Size Capacity Length Size

1-1/2 - 2 HP 6 - 9 CFM any 3/4 in. (19 mm)

3 - 5 HP 12 - 20 CFM Up to 200 ft (61 m) 3/4 in. (19 mm)

5 - 10 HP 20 - 40 CFM Up to 100 ft (30.5) 3/4 in. (19 mm)

10 - 15 HP 40 - 60 CFM Up to 100 ft (30.5) 3/4 in. (19 mm)

Air Hose Inside

Diameter

1/4 in. (6.4 mm)

40 psi (276 kPa, 2.8 bar)
50 psi (345 kPa, 3.4 bar)
60 psi (414 kPa, 4.1 bar)
70 psi (483 kPa, 4.8 bar)
80 psi (552 kPa, 5.5 bar)
90 psi (621 kPa, 6.2 bar)

5/16 in. (7.9 mm)

40 psi (276 kPa, 2.8 bar)
50 psi (345 kPa, 3.4 bar)
60 psi (414 kPa, 4.1 bar)
70 psi (483 kPa, 4.8 bar)
80 psi (552 kPa, 5.5 bar)
90 psi (621 kPa, 6.2 bar)

Minimum Pipe Size Recommendations

Compressor Main Air Line

Over 200 ft (61 m) 1 in. (25.4 mm))

Over100-200ft(30.5-61m) 1 in. (25.4 mm)

Over 200 ft (61 m) 1-1/4 in. (31.8 mm)

Over100-200ft(30.5-61m) 1-1/4 in. (31.8)

Over 200 ft (61 m) 1-1/2 in. (38.1)

Air Pressure Drop Through Hose, by hose length and ID

psi (Kpa, bar)

4 ft.

(1.22 m)

6 (41, .4)

7.5 (52, .5)
9 (62, .6)

10.75 (74, .7)

12.25 (84, .8)
14 (97, 1)

2.25 (16, .2)
3 (21, .2)

3.75 (26, .3)

4.5(31, .3)

5.5 (38, .4)

6.5 (45, .4)

10 ft.

(3.05 m)

8 (55, .6)

10 (69, .7)

12.5 (86, .9)

14.5 (100, 1)

16.5(114,1.1)

18.75 (129, 1.3)

2.75 (19, .2)

3.5 (24, .2)

4.5 (31, .3)

5.25 (36, .4)

6.25 (43, .4)

7.5 (52, .5)

15 ft.

(4.6 m)

9.5 (66, .7)
12 (83, .8)

14.5 (100, .1)
17 (117, 1.2)

19.5 (134, 1.3)
22 (152, 1.5)

3.25 (22, .2)
4 (28, .3)
5 (34, .3)
6 (41, .4)
7 (48, .5)

8.5 (59, .6)

20 ft.

(6.1 m)

11 (76, .8)

14 (97, 1)

16.75(115,1.2)

19.5 (134, 1.3)

22.5 (155, 1.6)

25.25 (172, 1.7)

3.5 (24, .2)

4.5 (31, .3)

5.5 (38, .4)

6.75 (47, .5)
8 (55, .6)

9.5 (66, .7)

25 ft.

(7.62 m)

12.75 (88, 0.9)
16 (110, 1.1)
19 (131, 1.3)

22.5 (155, 1.6)

25.5 (176, 1.8)

29 (200, 2)

4 (28, .3)
5 (34, .3)
6 (41, .4)

7.25 (50, .5)

8.75 (60, .6)

10.5 (72, .7)

50 ft.

(15.24 m)

24 (165, 1.7)
28 (193, 1.9)
31 (214, 2.1)
34 (234, 2.3)
37 (255, 2.6)

39.5 (169, 2.7)

8.5 (59, .6)
10 (69, .7)

11.5 (79, .8)
13 (90, .9)

14.5 (100, 1)
16 (110, 1.1)

4 309921N