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SPECIALIZED
HEALTHY
AIR SOLUTIONS
SPECIALIZED
HEALTHY
AIR SOLUTIONS
OWNER’S MANUAL
OWNER’S MANUAL
ASCENDANT
™
ASCENDANT
™
SPECIALIZED
HEALTHY
AIR SOLUTIONS
OWNER’S MANUAL
MAINTENANCE
COMPONENT
SERVICE
STARTUP
MONTH
1
3
6
9
12
WHEEL
Rotor bearing lubrication
x
x
x
Bearing bolts tightness
x
Bearing set screw tightness
x
x
x
x
Motor and gear reducer bolt
tightness
x
x
x
x
Check seals
x
x
x
x
Check/clean variable
frequency controller
x
Drive System
X
X
X
FAN
Check/clean shaft and wheel
x
x
x
x
x
FAN MOTORS
Clean motors
x
x
Inspect motor connections
x
x
Check operating current
x
x
Check motor bolt tightness
x
x
Lubricate motor bearings
x
DAMPERS
Check rotor blade clearance
x
Inspect damper for dirt and
foreign matter
x
x
x
x
Inspect dampers seals for
deterioration
x
x
x
x
FILTERS
Replace based on pressure
differential
MAINTENANCE SCHEDULE
DAILY MAINTENANCE
It is recommended that the unit be visually inspected daily. Taking a few moments each day to make sure that the
unit is functioning will save many future hours, dollars and headaches. Each day, ensure that:
•
The rotor is rotating under power;
•
The motor is running;
•
All devices are on and operating (the variable frequency controller, temperature controller, and rotation detector).
All other maintenance activity should be conducted monthly, quarterly, semiannually or annually as described in this
manual. All essential maintenance services are summarized in the
MAINTENANCE SCHEDULE
below.
SPECIALIZED
HEALTHY
AIR SOLUTIONS
OWNER’S MANUAL
PROBLEM
POSSIBLE CAUSES
SOLUTION
Vibration
Out of balance fan motor.
Check for dirt. If dirty, clean motor. Airfoil blades are usually hollow.
Check inside for moisture. If it is accumulating, drill 3/16” drain hole
on trailing edge to solve accumulation problem.
Loose mounting bolts.
Tighten bolts.
Bent fan shaft.
Check shaft with dial indicator. If bent, replace shaft immediately.
Fan operating in stall or
unstable flow.
Make sure system is operating at design static pressure and design
flow rates.
Noise -
motors
Supply voltage is high or
inconsistent.
Check supply voltage with voltmeter.
Correct supply voltage if necessary.
Poor air
performance
Incorrect fan rotation.
Rotation can be changed on 3-phase motors by reversing any 2
motor leads.
Abrupt turn in duct close to
fan discharge or air prespin
caused by elbows at fan inlet.
Install turning vanes or elbow splitters in duct. If more change is
needed, discharge position may have to be changed.
If fan has inlet volume
control, is it properly
installed?
Inlet volume control must be installed with prespin of the air in
direction of wheel rotation when control is partially closed.
Devices for air modulation
closed or plugged.
Open or unplug.
Clogged filters.
Replace filters.
Improperly mounted fan
wheel, or off-center wheel.
Center fan between inlet cones to avoid overloading one side and
starving the other side. Correct wheel mounting.
Fan power draw
unexpectedly low.
• Correct air prespin into fan inlet.
• Fan drive sheaves may be set for too low fan speed; correct if
necessary.
• Resistance to air flow is much higher than calculated; check for
closed damper or other duct obstructions; recheck duct layout.
Fan power draw
unexpectedly high.
• Fan speed may be too high. Fan may operate without duct work at
low resistance so too much air flows.
• Fan may be handling ambient air instead of intended hot, less
dense air.
• Fan may be running backward; check and correct if necessary.
Damaged or dirty fan or
system.
Clean fan or system, or replace damaged parts.
Motor
problems
Incorrect wiring.
Correct.
Fan speed too high.
Check fan speed against submittal.
Parts improperly installed or
binding.
See “Inspection” at beginning of this section. Re-check and correct if
necessary.
Bearings improperly
lubricated.
See motor lubrication instruction in the maintenance section.
Do not over-lubricate.
Protection devices may be
improperly sized.
Check against submittal.
TROUBLESHOOTING: FANS AND MOTORS
