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®
DUAL
Integrated Fire Protection System
OWNER'S OPERATION & MAINTENANCE MANUAL
FM-0860-0-31F
5.5 DEHYDRATOR OPTION
The Viking dehydrator is a manually regenerated desiccant-
type air dryer. The desiccant acts as a moisture indicator by
changing color, and is visible through the sight glass gauge.
♦ Technical information
1. The desiccant is silica gel having a -40°F (-40°C) dew
point at a maximum of 180°F (82°C) temperature with a
regeneration temperature of 275°F (135°C). When the
silica gel color changes from dark blue to light pink or
clear, it has become saturated with moisture and must
be changed.
2. Each unit has a standard air drying capacity of
8100 ft
3
(229.3m
3
) at an -40°F (-40°C) atmospheric dew
point at inlet condition of 100 psi (6.89 bar), 5% relative
humidity, 70°F (21°C) and 15 ft
3
/minute (0.425 m
3
/
minute) before the desiccant becomes saturated.
Figure 5.5 -– Dehydrator option (style "B" shown)
Dehydrator option components:
E12 Air inlet drain valve
E14 Air shut-off valve
E16 Dehydrator unit
3. The maximum air flow rating is 15 ft
3
/minute
(0.425 m
3
/minute) at 100 psi (6.89 bar) for each unit.
4. All ratings are based on 100°F (38°C) saturated inlet
air temperature at 100 psi (6.89 bar).
5. The aluminum bowl holds 2.5 pound (1.13 kg) of
desiccant and is rated for a maximum temperature
and pressure at 180°F (82°C) and 300 psi (20.7 bar).
6. The silica gel desiccant is provided in a sealed
2.5 pound (1.13 kg) bag and is shipped in a box
inside the unit cabinet.
Note: The dehydrator unit is to be used on compressed
air service only.
♦ Operation of dehydrator
The aluminum bowl of dehydrator is filled with silica gel.
As the relative humidity increases, the silica gel absorbs
the moisture and begin to change color from dark blue to
light pink, indicating the desiccant must be replaced.
To make dehydrator functional:
Follow instructions TO APPLY AIR PRESSURE at
section 5.3 OPERATION.
To drain dehydrator input line:
Follow instructions TO CLOSE THE AIR SUPPLY at
section 5.3 OPERATION. OPEN air inlet drain valve (E12)
until line pressure is relieved then close it.
Follow instructions TO APPLY AIR PRESSURE at
section 5.3 OPERATION.
To replace dehydrator charge:
Follow instructions TO CLOSE THE AIR SUPPLY at
section 5.3 OPERATION. OPEN air inlet drain valve (E12)
until line pressure is relieved then close it.
Unscrew both the bowl guard and the aluminum bowl.
Replace desiccant with a fresh charge. Reinstall in
reverse order. Be sure to align both gaskets.
Follow instructions TO APPLY AIR PRESSURE at
section 5.3 OPERATION.
Follow instructions described on Viking data sheet #276
(Form No. F_011711) provided with the silica gel recharge.
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