7
7
Extended Shutdown
Perform the following services whenever the unit is shutdown in excess of three days:
• If the unit is mounted on vibration isolators or isolation rails (by others), refer to the
manufacturer’s guidelines before loading/unloading weight from the unit.
• Disconnect, lock-out, and tag-out all fans and pumps.
• Close the shut-off valve in the make-up water line (supplied by others) and drain all
exposed make-up water piping. Heat trace and insulate all exposed piping.
• Drain the cold water basin and all the piping (excluding the coils) that will be exposed
to freezing temperatures. Heat trace and insulate all exposed piping.
• To minimize the risk of biological contamination during shutdown, it is recommended
the entire system be drained, excluding the coil.
• Clean all debris, such as leaves and dirt, from the interior and exterior of the unit.
• Clean and flush the water distribution system and cold water basin with the basin
strainer in place.
• Leave the cold water basin drain open so rain and melting snow will drain from the
unit.
• Clean the basin strainer and re-install.
• Cover the fan discharge to keep out dirt and debris.
• Lubricate the fan shaft bearings, motor base, and motor base adjusting screw (if
applicable).
• Apply RUST VETO
®
to steel shafts.
• Inspect the protective finish on the unit. Clean and refinish as required. Refer to
for more details.
• Lockout the fan motor starting device in the “OFF” position to ensure personal safety
in case of future inspection or service.
Prolonged Outdoor Storage
Storage Preparation
• Conduct the “Extended Shutdown” procedure on
if the unit is installed.
• Ensure the cold water basin is fully drained and the drain is open.
• For storage prior to installation, all components (ladders and platforms) and
accessories, which sometimes ship inside the unit and are not a permanent fixture in
the basin, should be removed and stored indoors.
• Remove the bottom drain plug to the spray pump(s). Put the plug(s) in a marked
plastic bag and attach to the spray pump(s) for future use.
• Remove and store fan belts (if supplied) indoors, keeping matched belts together. Tag
belts appropriately for future identification.
• For storage prior to installation, coils should be charged with nitrogen at 15 psi in the
factory. Units are available charged with nitrogen from BAC for a nominal fee.
• Installed units that have been piped but not filled do not require additional
precautions.
NOTICE:
Covering the unit with
a clear plastic tarpaulin during
storage can trap heat inside the
unit and cause damage to the
PVC components. If units must be
covered during storage, an opaque,
reflective tarp should be used.
DANGER:
Rotating equipment
will cause severe personal injury
or death to persons who come in
contact. Do not perform any service
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.
