UNT-SVX07E-EN 121
Routine Maintenance
Air Filters
Change or clean air filters at least twice a year. Filters
require more frequent care under high load or dirty air
conditions since a clogged filter reduces airflow. Tab le 1
and Table 2 on page 16 lists filter size and quantity by unit
size. Throwaway and pleated media filters are available for
all units.
Remove the front panel of the vertical recessed unit and
open the bottom panel door of the horizontal cabinet and
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this manual could result in exposure
to electrical, mechanical or other potential safety
hazards. Always refer to the safety warnings provided
throughout this manual concerning these procedures.
Unless specified otherwise, disconnect all electrical
power including remote disconnect and discharge all
energy storing devices such as capacitors before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components perform these tasks. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
Maintenance Checklist
Table 61. Maintenance Checklist
Frequency Maintenance
Every week
• Observe unit weekly for any change in running condition and unusual noise.
Every month
• Clean or replace air filters if clogged or dirty.
• Inspect and clean the main and auxiliary drain pans.
Every three to
six months
• Manually rotate the fan wheel to check for obstructions in the housing or interference with fan blades. Remove any
obstructions and debris.
• Check motor bracket torque.
• Inspect coils for dirt build-up. Clean fins if airflow is clogged.
Every year
• Check and tighten all set screws, bolts, locking collars and sheaves.
• Inspect the unit casing for chips corrosion. If damage is found, clean and repaint.
• Clean the fan wheels. Remove any rust from the shaft with an emery cloth and recoat with L.P.S. 3 or equivalent.
• Rotate the fan wheel and check for obstructions. The wheel should not rub. Adjust the center if necessary.
• Inspect and clean drain pans.
• Check damper linkages, fan set screws, and blade adjustment. Clean, but do not lubricate, the nylon damper rod bushings.
• Inspect, clean, and tighten all electrical connections and wiring.
• Inspect the strainer option for debris trapped in the filter screen.
• Examine flex connections for cracks or leaks. Repair or replace damaged material.
WARNING
Rotating Components!
The following procedure involves working with rotating
components. Disconnect all electric power, including
remote disconnects before servicing. Follow proper
lockout/ tagout procedures to ensure the power can
not be inadvertently energized. Secure rotor to ensure
rotor cannot freewheel. Failure to secure rotor or
disconnect power before servicing could result in
rotating components cutting and slashing technician
which could result in death or serious injury.
NOTICE:
Replace All Panels and Filters Properly!
All unit panels and filters must be in place prior to unit
startup. Failure to have panels and filters in place could
result in equipment damage.
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