7
7
Start-Up Procedure
General
• Verify the fan and unit pump motors are disconnected and locked out whenever
performing inspection or maintenance.
• If the unit is mounted on vibration isolators or isolation rails (by others), refer to the
vibration isolation manufacturer’s guidelines before loading/unloading weight from the unit.
Cleaning
• Inspect all spray nozzles and clean any which are dirty or clogged
(unlikely at initial start-up, but may be required for seasonal start-up).
• Clean all mechanical components, such as the fans and motors
(unlikely to be required at initial start-up).
• Flush the cold water basin interior to remove any accumulated dirt and debris.
• Remove, clean, and replace the strainer.
• Remove all dirt and debris from the fan guards.
• If necessary or required by local code, disinfect the HXV towers in accordance with
the most current versions of ASHRAE Standard 188: Legionellosis: Risk Management
for Building Water Systems, and ASHRAE Guideline 12: Minimizing the Risk of
Legionellosis Associated with Building Water Systems. This is not required on initial
startup unless water has been allowed to stagnate in the tower prior to startup.
Drain the cold water basin with the strainer in place.
Inspection
• Conduct external inspection of the equipment. Check for leaks, corrosion, and any
structural damage, including any damage to the hail guards.
• Conduct internal inspection of the equipment. Check for anything unusual such as
structural or mechanical component looseness or damage.
• Inspect piping and connections to verify they are secure.
• Inspect the visible coil surfaces. Any corrosion, damage, or obstructions should be
corrected.
• At seasonal start-up or after prolonged shutdown, check the motor insulation with
an insulation tester prior to the energizing the motor.
• Thoroughly inspect the fans for any mechanical or physical damage, and verify proper
fan tip clearance. Refer to Fan “Inspection & Maintenance” on
page 13
for more details.
• Inspect the fill, eliminators, combined inlet shields and hail guards before start-up,
and clean them if necessary. Inspect the CIS hail guards annually or after a hail event.
See
page 18
for more details.
Start-up
• Prior to seasonal start-up, check and adjust the belt tension.
• At initial start-up, the belt tension may not require adjustment as the drive will be
properly tensioned at the factory prior to shipment.
Unit Operation and
Storage
Sequence of Operation
Start-Up Procedure
General
Cleaning
Inspection
DANGER:
Rotating equipment
will cause severe personal injury
or death to persons who come in
contact. Do not perform any service,
maintenance, or inspection on or
near the fans, motors, and drives,
or inside the unit without first
ensuring that the fans and pump
motors are disconnected, locked
out, and tagged out.
Considerations for initial start-up:
For units with independent fan control, see Page 36. For units with VFDs, see Page 36. For units with vibration
cutout switches, see Page 34.
