AAON LL-540 - Manual (Page 49)

49
corrosion, sludge build-up and biological
fouling.
A water treatment monitoring and control
system has been furnished with this unit. Be
sure to read the complete manual that has
been furnished. All water treatment is a
combination of bleed water and chemical
treatment for proper control of the residuals
and to prevent any biological contamination.
Severe Service
The following recommended maintenance
procedures are basic requirements for
normal operating environments. For severe
operating conditions, the frequency of
inspection and service should be increased.
Air containing industrial and chemical
fumes, salt, dust, or other airborne
contaminates and particulates will be
absorbed by the recirculating water system
and may form solutions and deposits
harmful to the products and personnel.
Safety
The recirculating water system contains
chemical additives for water quality control
and biological contaminants removed from
the air by the washing action of the water.
Personnel exposed to the saturated effluent,
drift, or direct contact should use proper
precaution.
Proper location of the
evaporative-cooled condenser requires good
judgment to prevent the air discharge from
entering fresh air intakes or to avoid
allowing contaminated building exhaust
from entering the condenser.
Figure 22 - Proper Unit Location
Follow local and national codes in locating
the evaporative-cooled condenser but as
minimum the evaporative-cooled condenser
sump must be 15 feet from the nearest
intake.
Batch-loading chemicals into the unit
is NOT PERMITTED. The control
system must regulate the chemical
feed.
WARNING
The evaporative-cooled condenser
must be thoroughly cleaned on a
regular basis to minimize the growth
of bacteria, including Legionella
Pneumophila, to avoid the risk of
sickness or death. Service personnel
must wear proper personal protective
equipment. Do not attempt any
service unless the fan motor is locked
out.
WARNING