16
revised 10/09
Smog-Hog
PSH Series Model
7.4 Other Cleaning Considerations
the previous methods address the cleaning of collector
cells and filter media. the PSH cabinet should also
be periodically cleaned (i.e., during normal planned
downtimes) to reduce contaminant build up. High
voltage output of the power packs should also be
checked when manual cleaning is performed.
8. APPEARANCE OF COMPONENTS
AFTER CLEANING
components should have a clean, not necessarily
“new,” aluminum appearance. Discoloration will not
affect system efficiency. the following are acceptable
conditions for the system components. Parts should be
replaced as required.
8.1 Ionizer
1. aluminum frame, plates and ionizer wire support bar
are free of contaminant build-up.
2. ionizer standoff insulators are clean and white
(no residual coating). cracked or carbon-tracked
insulators have been replaced.
3. Wires and springs are intact and taut, centered
between plates and free of coatings.
4. contact springs and contact screws are properly
aligned.
5. Bent or broken parts have been repaired or replaced.
8.2 Collector Cell
1. aluminum frame is square, plates are parallel and hot
plates are centered between ground plates.
2. residual particles have been removed between
plates at corner supports. Material bridging across
plates has been removed.
3. triangular insulators are free of contaminant. cells
with carbon-tracked insulators have been replaced.
4. contact springs and contact screws are properly
aligned.
5. Bent or broken parts have been repaired or replaced.
8.3 Prefilters/Afterfilters
1. aluminum media and frame are free of contaminant.
2. frame is square and media is intact.
3. filters are always installed with drain holes down
and arrow on each frame pointing in the direction of
airflow.
6.7 dry-Out Time
ionizer(s), collector cell(s) and filter media should be
dry before the PSH is placed into operation. Startup
of a wet system will cause dead short conditions to
the ionizer and collector cell circuits. Wet ionizer(s),
collector cell(s) and filter media should be placed in a
warm room for drying. techniques such as hand wiping
insulators and blowing dry unicells and filter media
with compressed air will decrease drying time. another
method for drying cleaned components is installing the
ionizer(s), collector cell(s) and filter media in the PSH
and placing on the system blower on line, with all power
pack enclosure toggle switches placed in the “off”
position for 30 minutes.
7. MANUAL CLEANING METHOdS
the manual cleaning method selected will depend
on the type of contaminant, rate of deposit, facility
limitations such as cleaning time windows (process
downtime) and available utilities. all cleaning methods
listed in this section are acceptable.
7.1 Soak Tank
this is the most effective method which involves placing
ionizers, collector cells and filter media in an agitated
solution of hot water and detergent. With proper
detergent selection and concentration, this procedure
will quickly remove most contaminants. ionizer(s),
collector cell(s) and filter media should not be placed
in highly concentrated detergent solutions or allowed to
soak for extended periods, (e.g., overnight), especially
at elevated temperatures. extended period of soaking in
solvent or detergent solution will degrade components
(oxidation) over time and should be avoided.
7.2 Portable Pressure Washer
a self-contained pressure washer with a spray wand
can be an effective cleaning method, providing it is
used with caution. care should be taken not to expose
the collector cells to close-up and prolonged blasts of
high pressure/temperature, causing cell plate deformity,
requiring a replacement set of ionizer(s), collector
cell(s) and filter media.
7.3 Automatic Parts Washers
certain commercially available units which are effective
combine and automate the features necessary for
effective cleaning, including water heating, detergent
injection, agitation, rinsing and drying.
