19
Operation and Maintenance Instructions
Seasonal Shutdown Checklist
When the system is to be shut down for an extended period of
time, the following services should be performed.
1. The evaporative cooling unit cold water basin should
be drained
2. The cold water basin should be flushed and cleaned
with the suction strainer screens in place.
3. The suction strainer screens should be cleaned and
re-installed.
4. The cold water basin drain should be left open.
5. The fan shaft bearings and motor base adjusting
screws should be lubricated. This should also be
performed if the unit is going to sit idle prior to initial
start-up.
6. The makeup water supply, overflow and drain lines,
as well as the recirculating pump and pump piping
up to the overflow level must be heat traced and
insulated to account for any residual water.
7. The finish of the unit should be inspected. Clean and
refinish as required.
8. The fan, motor and pump bearings need to be
turned at least once a month by hand. This can be
accomplished by making sure the unit’s disconnect
is tagged and locked out, and grasping the fan
assembly, rotating it several turns.
9. Energize fan motor space heaters.
10. Closed Circuit Coolers only - If the recommended
minimum fluid flows through the heat transfer
coil cannot be maintained, and an anti-freeze
solution is not in the coil, the coil must be drained
immediately whenever the system pumps are shut
down or flow stops during freezing conditions. This
is accomplished by having automatic drain valves
and air vents in the piping to and from the cooler.
Care must be taken to ensure that the piping is
adequately insulated and sized to allow the water to
flow quickly from the coil. This method of protection
should be used only in emergency situations and
is neither a practical nor recommended method of
freeze protection. Coils should not be drained for an
extended period of time, as internal corrosion may
occur. See Cold Weather Operation section of this
document for more details.
See fan and pump manufacturer maintenance and long
term storage instructions for more detailed instructions.
