8
3.0 MAINTENANCE
3.1 Condenser coil
A.
Air-cooled - clean off accumulated dust and dirt monthly.
A factory mounted blow gun is provided for this pur-
pose.
B.
Water-cooled - clean strainer monthly, more often if
required. Shut off water, remove small plug to relieve
pressure, then remove large plug to remove strainer.
Clean strainer and replace.
3.2 Moisture separator/Oil filters
A.
When to replace the Separator/Filters
Replace filter element when pressure drop across dryer is
excessive or annually.
Dryers have the option of one or two stages of filtration.
The direction for servicing the top stage applies to both
the top stage in a two-stage arrangement and the single
stage in a single stage dryer.
When removing liquids at rated flow conditions, the
pressure drop will be 5 psi (0.35 bar), or less, across the
entire dryer. An increase in pressure drop will occur only
as the separator/filter elements become loaded with
solid particles. It is recommended, for maximum filtration
efficiency, the separator/filter elements be replaced
when the pressure drop across the dryer exceeds 10 psi
(0.7 bar), or every 12 months, whichever occurs first.
B.
Description of the Separator/Filter Assembly
The separator/filter assembly consists of: the separator
shell assembly (1), the upper shell cap (2), the upper shell
coupling and gasket (3), the upper piping coupling and
gasket (4), the element retainer plate (5), and the separa-
tor/filter elements (6).
C.
Replacement of the Separator/Filters
Depressurize the unit before servicing. Failure
to do this may result in injury. The unit must be depressurized
before the couplings are removed.
a.
For normal element replacement, the only assembly
component that must be removed is the upper shell
cap. Remove the insulation from the upper shell cap.
Check to be sure the unit is depressurized.
b.
Remove the two bolts on the upper shell coupling
(3) and the upper piping coupling (4). Remove the
couplings, exposing the gaskets.
c.
Slide the upper piping gasket up on to the upper
piping. Slide the upper shell gasket down on to the
separator shell (1). The upper shell cap (2) should now
be free and removable.
d.
Remove the upper shell cap (2).
e.
Remove the element retainer plate (5).
f.
Remove the separator/filter elements (6) by simply
lifting them off of the element sealing posts (1b).
Discard the old elements.
g.
Inspect the inside surfaces of the separator shell (1),
the element seal plate (1a), and the element sealing
posts (1b).
Gasket
Coupling
Half
Grooved Shell
Grooved Upper
Shell Cap
Bolts
3 & 4
NOTE: If the inside surfaces require additional cleaning or
inspection, the entire shell assembly(1) can be removed by
disassembling the lower shell coupling and gasket.
h.
Lubricate the new separator/filter element o-ring
seals according to the element package instructions.
i.
Install the new elements by carefully pushing them
on to the element sealing posts (1b).
j.
Reinstall the element retainer plate (5).
k.
Replace the upper shell cap (2).
l.
Inspect the upper shell cap gasket and the upper
piping gasket and apply a thin coat of lubricant to
the outside and to the sealing lips of these gaskets.
m. Slide the gaskets into position, centering them
between the coupling grooves.
n.
Replace the upper shell cap coupling (3) and the
upper piping coupling (4). Tighten the bolts evenly
and alternately.
Uneven tightening may cause the gaskets to
pinch and not seal! Gasket damage may result!
o.
Reinstall the insulation.
p.
Slowly repressurize the dryer.
q.
Inspect the assembly for air leaks.
NOTE: Further disassembly is not required or recommended
for maintenance.
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