AAON LL-540 - Manual (Page 50)

50
Figure 23 - Improper Unit Locations
Performance
Improper location of the evaporative-cooled
condenser may seriously degrade the
capacity of the equipment. Make sure the
equipment is located such that discharge air
from the condenser does not enter the
condenser air inlet.
Warranties
Please refer to the limitation of warranties in
effect at the time of purchase.
Condenser Tube Inspection
The coil is leak tested at 450 P.S.I.G. before
shipment. AAON will not be responsible for
loss of refrigerant. It is the responsibility of
the installer to verify that the system is
sealed before charging with refrigerant. If
the unit is operated during low ambient
temperature conditions, freeze protection for
the recirculating water system must be
provided.
Freeze Protection
In order to prevent water temperatures from
dropping below 50°F, this unit is equipped
with a VFD on the fan motors when the
refrigeration system is operating.
Recirculating Water System
Electric sump heaters are available to keep
the sump water from freezing when the
refrigeration system is not operating. An
electric resistance heater is supplied in the
vestibule when sump heaters are selected.
Note: The condenser should not be operated
with the fan on and the pump cycled on and
off to maintain head pressure control under
any conditions. The unit is equipped with a
water temperature controller which varies
fan
speed to maintain sump water
temperature. This unit is not equipped with a
compressor discharge pressure controller for
fan speed modulation and therefore cannot
be operated without water flow.
Startup
Do
not start the evaporative-cooled
condenser or compressors without
installation of proper water treatment
chemicals.
Contact your local water
treatment expert for correct selection of
water treatment chemical, adjustment of
chemical feed and bleed rates.
Cleanliness
Dirt and debris may accumulate in the sump
during shipping and storage. The sump
should be cleaned prior to startup to prevent
clogging the water distribution system. Any
surfaces that show contamination should be
cleaned ONLY with a commercial stainless
steel
cleaner to restore the initial
appearance. The inlet screens should be
inspected for foreign material.
Storage
Pumps removed from service and stored,
must be properly prepared to prevent
excessive rusting. Pump port protection
plates must not be removed until the pump is