Dampers
Check all dampers to ensure they open and close
properly and without binding. Backdraft dampers
can be checked by hand to determine if blades open
and close freely. Apply power to motorized dampers
to ensure the actuator opens and closes the damper
as designed.
Fan Belts
Belts must be checked on a regular basis for wear,
tension, alignment, and dirt accumulation. Premature
or frequent belt failures can be caused by improper
belt tension (either too loose or too tight) or misaligned
sheaves. Abnormally high belt tension or drive
misalignment will cause excessive bearing loads and
may result in failure of the fan and/or motor bearings.
Conversely, loose belts will cause squealing on start-up,
excessive belt flutter, slippage, and overheated sheaves.
Both loose and tight belts can cause fan vibration.
When replacing belts on multiple groove drives, all belts
should be changed to provide uniform drive loading. Do
not pry belts on or off the sheave. Loosen belt tension
until belts can be removed by simply lifting the belts off
the sheaves. After replacing belts, ensure that slack in
each belt is on the same side of the drive. Belt dressing
should never be used.
Do not install new belts on worn sheaves. If the sheaves
have grooves worn in them, they must be replaced
before new belts are installed.
The proper belt setting is the lowest tension at which
the belts will not slip under peak load operation. For
initial tensioning, set the belt deflection at 1/64- inch
for each inch of belt span (measured half-way between
sheave centers). For example, if the belt span is 64
inches, the belt deflection should be one inch (using
moderate thumb
pressure at mid-point
of the drive). Check
belt tension two times
during the first 24 hours
of operation and
periodically thereafter.
Fan Motors
Motor maintenance is generally limited to cleaning
and lubrication. Cleaning should be limited to exterior
surfaces only. Removing dust and grease buildup on
the motor housing assists proper motor cooling. Never
wash-down motor with
high pressure spray.
Greasing of motors is only
intended when fittings
are provided. Many
fractional motors are
permanently lubricated
for life and require no
further lubrication.
Routine Maintenance
DANGER
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit to OFF
at disconnect switch(es). Unit may have multiple
power supplies.
CAUTION
Use caution when removing access panels or other
unit components, especially while standing on a
ladder or other potentially unsteady base. Access
panels and unit components can be heavy and
serious injury may occur.
Once the unit has been put into operation, a routine
maintenance program should be set up to preserve
reliability and performance. Items to be included in this
program are:
Lubrication
Apply lubrication where required
Dampers
Check for unobstructed operation
Fan Belts
Check for wear, tension, alignment
Motors
Check for cleanliness
Blower Wheel & Fasteners
Check for cleanliness
Check all fasteners for tightness
Check for fatigue, corrosion, wear
Bearings
Check for cleanliness
Check set screws for tightness
Lubricate as required
External Filter
Check for cleanliness - clean if required
Internal Filter
Check for cleanliness - replace if required
Door Seal
Check if intact and pliable
Energy Recovery Wheel
Check for cleanliness - clean if required
Check belt for wear
Check pulley, bearings, and motor
Maintenance Procedures:
Lubrication
Check all moving components for proper lubrication.
Apply lubrication where required. Any components
showing excessive wear should be replaced to maintain
the integrity of the unit and ensure proper operation.
Belt Span
Deflection =
Belt Span
64
Energy Recovery Ventilator
21
®
