2
E
N
G
L
I
S
H
Pressure psig (bar)
20 (1.4)
40 (2.8)
60 (4.1)
80 (5.5)
100 (6.9)
150 (10.3)
200 (13.8)
HDF1
1.5 (2.6)
2.4 (4.1)
3.3 (5.5)
4.1 (7.0)
5.0 (8.5)
7.2 (12.2)
9.4 (15.9)
HDF2
3.0 (5.1)
4.8 (8.1)
6.5 (11.1)
8.3 (14.0)
10.0 (17.0)
14.4 (24.4)
18.7 (31.8)
HDF3
6.1 (10.3)
9.5 (16.2)
13.0 (22.1)
16.5 (28.1)
20.0 (34.0)
28.7 (48.8)
37.4 (63.6)
HDF4
9.1 (15.4)
14.3 (24.3)
19.5 (33.2)
24.8 (42.1)
30.0 (51.0)
43.1 (73.2)
56.2 (95.4)
Model
2.0 INSTALLATION
A.
Location:
The dryer should normally be placed upstream of a
reducing valve (regulator). For longest service life, all
liquid moisture in the air line must be removed prior to
the dryer inlet.
B.
Flow Direction:
Check that the unit is piped so that flow is
in the proper direction as indicated by the arrows on the
dryer head.
C.
Silica gel desiccant:
Silica gel desiccant is shipped in a separate container.
Before operating dryer, follow the steps to fill dryer with
initial charge of silica gel desiccant:
1.
Push up and rotate the bowl 1/8
th
of a turn counter-
clockwise to remove the bowl from the head.
2.
Fill bowl with new silica gel desiccant supplied with unit,
being careful not to get any desiccant down transfer
tube.
Model HDF1 requires 1 lb of silica gel desiccant.
Model HDF2 requires 2 lbs of silica gel desiccant.
Model HDF3 requires 4 lbs of silica gel desiccant.
Model HDF4 requires 6 lbs of silica gel desiccant.
NOTE: Dry (good) silica gel desiccant is translucent white with
blue beads interspersed. If the silica gel desiccant is pink or
no blue beads are present then the silica gel desiccant must
be replaced or regenerated.
3.0 OPERATION
A.
Paint Gun Arrangements with the HDF Series Dryer System
Model
Spray Gun Type
Number of Guns
HDF1
Detail or small pressure feed
1
HDF2
Pressure or gravity feed
1
HDF3
HVLP
1
HDF4
HVLP
2
B.
Maximum scfm (m
3
/hr) at various operating pressures
C.
Silica Gel Desiccant Life:
Table 1 shows the theoretical life of the unit at the
stated operating conditions. Life of the silica gel desic-
cant will vary depending on inlet flow, pressure and
temperature. Check with your local representative if
additional operational information is required.
D.
Sight Glass – Moisture Indicator:
The silica gel desiccant is to be changed or regenerated
when the moisture indicator changes from blue (good)
to white (silica gel desiccant saturated).
E.
Regeneration of silica gel desiccant:
To regenerate the silica gel desiccant, bake the desiccant
for 4 hours at 250
°
F (121
°
C). Successfully regenerated
silica gel desiccant will be translucent white with blue
beads interspersed.
F.
Determining outlet dew point. With completely dry
silica gel desiccant, dryer outlet dew point is a function
of inlet temperature. While the silica gel desiccant is
adsorbing moisture a relatively constant dew point is
maintained until the desiccant bed nears saturation. At
this point the dew point begins to rise rapidly. Table 2
shows the relationship of the inlet temperature to
outlet dew point with dry silica gel desiccant.
TABLE 2
Outlet dew point* with dry silica gel desiccant
Inlet Temp.
°
F (
°
C)
35 (1.7)
40 (4.4)
50 (10.0)
60 (15.6)
70 (21.1)
80 (26.7)
90 (32.2)
100 (37.8)
110 (43.3)
120 (48.9)
-60 (-51.1) -55 (-48.3) -50 (-45.6) -45 (-42.8)
-40 (-40.0) -35 (-37.2)
-30 (-34.4) -25 (-31.7)
-20 (-28.9)
-15 (-26.1)
Outlet A.D.P.*
°
F (
°
C)
* Atmospheric Dew Point
Model
Rated scf (m
3
)
HDF1
2,500 (71)
HDF2
5,000 (142)
HDF3
10,000 (283)
HDF4
15,000 (425)
TABLE 1
Inlet Pressure = 100 psig (7 bar)
Rated Life at Stated Flow = 500 minutes (8 hrs 20 min)
Inlet Temperature = 70
°
F (21
°
C)
Relative Humidity = 100%
