3
E
N
G
L
I
S
H
4.0 MAINTENANCE
NOTE: If prefilter unit present, check system at least once
per day to ensure proper drainage.
Changing silica gel desiccant:
1.
Isolate dryer from system by opening by-pass valve
(if one is installed) and closing inlet and outlet valves.
2.
Depressurize dryer before servicing.
Loosen bottom plug after unit has been isolated to
depressurize the dryer. Re-tighten once depressurized.
3.
Push up and rotate the bowl 1/8th of a turn counter-
clockwise to remove the bowl from the head.
4.
Dump old silica gel desiccant out of bowl. (Saturated
Silica Gel Desiccant will appear pink in color)
5.
Refill bowl with new or regenerated silica gel
desiccant being careful not to get any desiccant
down transfer tube.
DIMENSIONS & WEIGHTS
Model Number
HDF1
HDF2
HDF3
HDF4
Nominal Air Flow scfm (m
3
/min) @ 100 psig (7 bar)
5 (0.14)
10 (0.28)
20 (0.57)
30 (0.85)
In/Out Connection (NPTF)
1/4"
1/4"
1/2"
1/2"
Bowl Type
Aluminum
A in (mm)
4.13 (105)
4.13 (105)
4.13 (105)
4.13 (105)
B in (mm)
12.62 (321)
12.03 (305)
20.25 (514)
28.08 (741)
C in (mm)
3.0 (76)
3.0 (76)
3.0 (76)
3.0 (76)
F in (mm) (optional prefilter)
4.13 (105)
4.13 (105)
4.13 (105)
4.13 (105)
Weight, Unit lb (kg)
13.0 (5.9)
15.0 (6.8)
19.5 (8.9)
22.5 (10.2)
Weight, Unit lb (kg) (with prefilter)
4.14 (1.88)
4.14 (1.88)
4.14 (1.88)
8.1 (3.67)
Weight, Silica Gel Desiccant Refill lb (kg)
1.0 (0.45)
2.0 (0.9)
4.0 (1.8)
6.0 (2.7)
Max. Operating Pressure psig (bar)
200 (14)
200 (14)
200 (14)
200 (14)
Max. Operating Temeperature
125
°
F (52
°
C)
125
°
F (52
°
C)
125
°
F (52
°
C)
125
°
F (52
°
C)
Silica Gel Desiccant Replacement P/N
HSG1
HSG2
HSG3
HSG4
5.0 SPECIFICATIONS
NOTE: Dimensions and weights are for reference only. Request certified drawings for construction purposes.
HDF1
HDF2, HDF3, & HDF4
Model HDF1 requires 1 lb of replacement silica gel
desiccant.
Model HDF2 requires 2 lbs of replacement silica gel
desiccant.
Model HDF3 requires 4 lbs of replacement silica gel
desiccant.
Model HDF4 requires
6 lbs of replacement silica gel desiccant.
NOTE: Silica gel desiccant beads are non-toxic and
non-flammable.
6.
It is recommended that the transfer tube assembly
be cleaned with soap and water with each silica gel desic-
cant change. However, this is not necessary as
long as pressure drop across dryer remains
within acceptable limits.
7.
Reassemble bowl to head making sure that o-ring in
the bowl is in place and lightly lubricated.
8.
Repressurize, by
slowly
opening inlet valve, then
opening outlet valve, and finally closing by-pass valve. (If
installed)
Transfer Tube
A
B
C
IN
OUT
F
F
A
F
B
C
IN
F
Transfer Tube
Optional Prefilter
Optional Prefilter
