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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 de-
pressurize 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 desiccantdown transfer
tube.
5.0 SpEcIFIcATIONS
Model Number
Nominal Air Flow scfm (m
/min) @ 100 psig (7 bar)
3
In/Out Connection (NPTF)
Bowl Type
A in (mm)
B in (mm)
C in (mm)
F in (mm) (optional prefilter)
Weight, Unit lb (kg)
Weight, Unit lb (kg) (with prefilter)
Weight, Silica Gel Desiccant Refill lb (kg)
Max. Operating Pressure psig (bar)
Max. Operating Temperature
Silica Gel Desiccant Replacement P/N
NOTE: Dimensions and weights are for reference only. Request certified drawings for construction purposes.
F
IN
Optional Prefilter
HDf1
5 (0.14)
1/4"
4.13 (105)
12.62 (321)
3.0 (76)
4.13 (105)
13.0 (5.9)
4.14 (1.88)
1.0 (0.45)
200 (14)
125°F (52°C)
HSG1
F
A
A
IN
OUT
IN
Transfer Tube
B
C
HDF1
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-flam-
mable.
6.
It is recommended that the transfer tube assembly be
cleaned with soap and water with each silica gel desiccant
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.
Repressurize, by slowly opening inlet valve, then open-
8.
ing outlet valve, and finally closing by-pass valve. (If
installed)
DIMENSIONS & WEIGHTS
HDf2
HDf3
10 (0.28)
20 (0.57)
1/4"
1/2"
Aluminum
4.13 (105)
4.13 (105)
12.03 (305)
20.25 (514)
3.0 (76)
3.0 (76)
4.13 (105)
4.13 (105)
15.0 (6.8)
19.5 (8.9)
4.14 (1.88)
4.14 (1.88)
2.0 (0.9)
4.0 (1.8)
200 (14)
200 (14)
125°F (52°C)
125°F (52°C)
HSG2
HSG3
F
F
A
IN
OUT
B
B
Optional Prefilter
C
C
HDF2, HDF3, & HDF4
HDf4
30 (0.85)
1/2"
4.13 (105)
28.08 (741)
3.0 (76)
4.13 (105)
22.5 (10.2)
8.1 (3.67)
6.0 (2.7)
200 (14)
125°F (52°C)
HSG4
A
Transfer Tube
B
C
E
N
G
L
I
S
H
3
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