3
W W W . B A L T I M O R E A I R C O I L . C O M
Attention
•
The basin heater is not designed to prevent icing during unit operation.
•
The heater control panel temperature/low level control can only be used with the supplied combination temperature/liquid level sensor
probe. Please contact your local BAC Representative for replacement parts.
•
For the stand alone BAC heater control panel, do not operate the system unattended or for extended periods of time during test mode
(resistor across terminals T1 and T2). Operation in water temperatures above 45°F (7.2°C) could damage the unit.
•
For heater control panels, do not operate the system unattended or for extended periods of time with terminals G1-G2 jumpered. A low
liquid level condition could occur, and the system will not shut off which could result in damage to the heater and unit.
•
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.
•
For fan motors controlled with VFDs with a switching frequency of 2.5 kHz, the line lead length cannot exceed 100 feet. If the switching
frequency is higher than 2.5 kHz and/or the line lead length exceeds 100 feet, a dV/dT output filter is recommended to protect the motor.
•
When reversing the direction of fan rotation, allow the fan to come to a complete stop before restarting the motor.
•
Only lubricate the bearings with one of the following compatible water resistant greases on
page 17
.
•
Do not use steam or high pressure water to clean PVC eliminators or materials other than steel.
•
Never use chloride or chlorine based solvents such as bleach or muriatic (hydrochloric) acid to clean stainless steel. It is important to
rinse the surface with warm water and wipe with a dry cloth after cleaning.
•
Neglected damaged areas on the Whisper Quiet Fan can result in the attack of the glass-fiber layers (a process commonly known as
fiberbloom) because of moisture entering through these spots.
•
Gear drives should not be used with Wye-Delta (Y-
) motors.
•
For installations with 2-speed motors when slowing from high speed, allow a minimum 15-second time delay for the fan to slow down
before energizing the low-speed winding.
•
For towers with optional gear drives, do not mix synthetic lubricants and mineral oils. Attempt to use only one brand of lubricant at all
times. If the brand is changed, completely drain the old oil before filling the gear with new oil.
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 unit should be located such that unusual quantities of industrial smoke, chemical fumes, salt, or heavy dust do not enter
the water stream. Such airborne impurities are carried into the equipment and absorbed by the recirculating water which can form a
corrosive solution.
•
WATER:
As water evaporates from the equipment, dissolved solids are left behind, which were 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, they 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. Refer to “Water
Treatment” on
page 22
and “Biological Control” on
page 23
for more details.
General Maintenance Information