Tube Axial Upblast Fans
10
®
Variable Frequency Drive
Operation
For operation with a variable frequency drive (VFD)
always check motor amps when adjusting the
operating frequency. Motor may be sized for the
original selected operating speed under 60 Hz.
Bypassing the VFD or increasing the speed from this
original selection, even if less than 60 Hz, may cause
motor to overload or fail. Consult factory with fan
serial number before increasing the upper limiting
frequency.
Always check the fan RPM when adjusting the
operating frequency. Do not exceed maximum class
fan RPM of the propeller.
NOTE
It is the responsibility of the installing body to
perform coast-down tests and identify any resonant
frequencies after the equipment is fully installed.
These resonant frequencies are to be removed
from the operating range of the fan by using the
“skip frequency” function in the VFD programming.
Failure to remove resonant frequencies from the
operating range will decrease the operating life of
the fan and void the warranty.
Field Coating Touch-Up Procedure
for Scratched Areas
Standard coating and color is RAL 7023 Concrete
Grey. This procedure outlines the correct method for
repairing minor scratches in the coating.
1. Scuff affected area to be repaired using medium
sandpaper (provided) or medium Scotch Brite™
pad. Feather the edges.
2. Clean affected area to be touched up using an
alkaline based cleaner and rinse.
3. Apply Kem Kromik
®
primer using 1 inch foam
brush (provided). Follow technical data sheet
instructions.
4. Allow primer to dry a minimum of 2-1/2 hours
before top coating.
5. Apply topcoat with industrial enamel using 1 inch
foam brush (provided). Follow technical data
sheets instructions. Allow painted units to air-dry
and cure before putting into service. See Technical
Data sheets (included with kit) for detailed drying
and cure schedules at different temperatures.
To order coating repair kits please reference part
number HAZ2597 PNT FIELD REPAIR KIT, RAL 7023
CONCRETE GREY. Please contact factory with your
fan’s serial number for colors other than our standard.
TOUCH-UP PAINT REPAIR KIT CONTENTS
• One pint of Kem Kromik
®
primer
- including a technical data sheet
• One pint of industrial enamel
- including a technical data sheet
• Four disposable foam brushes
• One sheet sandpaper
• Repair procedure details
NOTE
While the manufacturer provides heavy-duty, quality
products for marine environments, routine paint
touch-ups may be required in coastal regions where
salt or marine air could damage the coating. The
severe environment will accelerate the damage from
any scratches or chips and it is recommended that
those be repaired immediately.
