Warnings
•
WARNING:
Do not perform any service on or near the fans, motors, and drives, or inside the unit
without first ensuring that the fans and pumps are disconnected, locked out, and tagged out.
•
WARNING:
Check to ensure the controls for the fan motor are set to allow a maximum of six on-off
cycles per hour to prevent motor overload.
•
WARNING:
Openings and/or submerged obstructions may exist in the bottom of the cold water basin.
Use caution when walking inside this equipment.
•
WARNING:
The top horizontal surface of the unit is not intended to be used as a walking surface or
working platform. If access to the top of the unit is desired, the purchaser/end-user is cautioned to
use appropriate means complying with applicable safety standards of governmental authorities.
•
WARNING:
Drift eliminators on RC Series units are not designed to support the weight of a person or
to be used as a storage or work surface for any equipment or tools.
•
WARNING:
When the fan speed of the unit is to be changed from the factory set speed, including
changes achieved by the use of a variable fan speed device, steps must be taken to avoid operation
at or near the fan’s “critical speed” which could result in fan failure and possible personal injury
or damage. Contact your local BAC Representative regarding any such applications. Additionally,
inverter duty motors are required on installations that are to be controlled by VFDs.
•
WARNING:
The re-circulating water system may contain chemicals or biological contaminants,
including Legionella, which could be harmful if inhaled or ingested. Personnel exposed directly
to the discharge airstream and the associated drift mists, generated during operation of the water
distribution system and/or fans, or mists produced by high pressure water jets or compressed air
(if used to clean components of the re-circulating water system), must wear respiratory protection
equipment approved for such use by governmental occupational safety and health authorities.
•
WARNING:
The basin heater is not designed to prevent icing during unit operation.
General Maintenance Information
The services required to maintain a piece of evaporative cooling equipment are primarily a function of the
quality of the air and water in the locality of the installation:
•
AIR:
The most harmful atmospheric conditions are those with unusual quantities of industrial smoke,
chemical fumes, salt, or heavy dust. Such airborne impurities are carried into the equipment and
absorbed by the re-circulating water to form a corrosive solution.
•
WATER:
The most harmful conditions develop as water evaporates from the equipment, leaving behind the
dissolved solids originally contained in the make-up water. These dissolved solids may be either alkaline or
acidic and, as they are concentrated in the circulating water, can produce scaling or accelerated corrosion.
The extent of impurities in the air and water determines the frequency of most maintenance services and
also governs the extent of water treatment which can vary from a simple continuous bleed and biological
control to a sophisticated treatment system.
