Sterling EV - Manual (Page 12)

– 12 –
Open all disconnect switches
and secure in that position before servicing unit.
Failure to do so may result in personal injury or
death from electrical shock.
Because of the nature of the evaporative process, algae
buildup, biological fouling, scale build-up, and corrosion are
distinct possibilities. Proper water treatment and regularly
scheduled maintenance will minimize or eliminate most
problems.
a.) Cooling Pad Check List:
√ Reduce the number of on/off cycles.
√ Shade the pads and pump.
√ Dry pads out completely once every 24 hours.
√ Maintain a suitable water bleed-off rate.
√ Drain and disinfect the entire water system
quarterly.
√ Avoid harmful contaminants, including dust,
fumes, harsh cleaners, and water treatment
chemicals.
√ Circulate the recommended quantity of
water over the pads.
√ Avoid dry areas on the pads.
√ Clean the fi lters regularly.
b.) Controlling Algae:
Scale and mineral deposits can form on the
cooling pad because the mineral content of
the water is too high.
Increase the water fl ow over the face of the pads.
Make certain that the fl ow of water is even from
one end of the distribution pipe to the other end.
Clean and fl ush the distributor pipe regularly;
especially if dry areas appear on the pads.
Maintain the pH of the recirculating water
between 6 and 8.
Maintain suffi cient bleed-off rate.
For more details, check MUNTERS ® Engineering
Bulletin EB-WTM-502 (included with this manual).
c.) Preventing Algae in the Evaporative Pads:
Algae needs light, moisture, and nutrients
to survive. Eliminating, or reducing, these
elements will help to control algae. For specifi c
details, see MUNTERS
® Engineering Bulletin
EB-WTM-502 (included with this manual).
MAINTENANCE
d.) Biological Fouling Control:
Uncontrolled growth of organic matter can lead to
plugged media, metal deterioration, and biologi-
cal contamination of the airstream. Whenever the
possibility of biological contamination of water in
an airstream exists, transmittal of Legionnaire’s
Disease should be addressed. While there are
no reported cases of Legionnaire’s Disease as-
sociated with rigid media type evaporative cooling
systems, the Legionella Pneumophila bacteria is
present in almost all water supplies. However, the
mere presence of the bacteria does not create a
hazard: the bacteria must be transmitted as an
aerosol in suffi cient densities to be infectious.
NOTICE: It is highly recommended that the services
of a water treatment company be retained to advise
on the proper treatment of the sump water for
biological, scale, and corrosion control. For more
information, see MUNTERS
® Engineering Bulletin
EB-WTM-502 (included with this manual).
Maintenance Schedule
Regular maintenance is the key to successful service from
your Evaporative Cooler. Use the following schedule as a
guide to maintain you unit:
Maintenance Annual Annual
Requirements Start-Up Shut-Down
Changing Media At Beginning of 6th
Year or if Passages
are blocked
Cleaning Water
Pump √
Cleaning &
Touch-Up √
Adjusting Bleed-Off √
Periodic Inspection During Cooling During Cooling
Season Season
Washing Down As Required During
Media with Hose Season
Washing Inlet Filter
with Hose √ √
Drain Unit √
Following are explanations of the procedures outlined in
the above schedule.
Changing the Media
This should be done every 5 years or if passages become
blocked.
1. Remove fi lter/frame assemblies.
2. Disconnect the water hood panel from the top panel
by removing screws.
3. Snap out water distribution system.
4. Remove top media distribution pad.
5.
Lift out media sections (Note the position of media
with respect to airfl ow. See Figure 11)