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Operation and Maintenance Instructions
Initial and Seasonal Start-Up Checklist
General
1. Verify that the overall installation reflects the requirements
of the installation guidelines found in EVAPCO Bulletin 311
– Equipment Layout Manual, available at www.evapco.eu.
2. For multi-speed fan motors, verify that 30 second or
greater time delays are provided for speed changes
when switching from high to low speed. Also check to
see if interlocks are provided to prevent simultaneously
energizing high and low speed, and confirm both speeds
operate in the same direction.
3. Verify all safety interlocks work properly.
4. For units operating with a variable frequency drive, make
certain that minimum speed requirements have been
set. Check with VFD manufacturer for recommended
minimum speeds and for recommendations on locking out
resonance frequencies.
5. Verify that a water treatment plan has been implemented
including passivation of galvanized steel units.
See “Water Treatment” section for more details.
6. For units subject to freezing climates, high humidity
climates, or idle periods lasting 24 hours or more,
motor space heaters are suggested and (if equipped)
should be energized. Alternatively, fan motors may be
energized for 10 minutes, twice daily, to drive any moisture
condensation out of the motor windings.
7. If the unit is going to sit idle for an extended period of
time, follow all manufacturers’ fan motor and pump
instructions for long term storage.
See your local EVAPCO representative for additional
information on unit storage.
BEFORE BEGINNING ANY MAINTENANCE, BE CERTAIN
THAT THE POWER IS TURNED OFF AND THE UNIT IS
PROPERLY LOCKED AND TAGGED OUT!
Initial and Seasonal Start-Up
1. Clean and remove any debris, such as leaves and dirt from
the air inlets.
2. Flush the cold water basin (with the strainer screens in
place) to remove any sediment or dirt.
3. Remove the strainer screen, clean and reinstall.
4. Check mechanical float valve to see if it operates freely.
5. Inspect water distribution system nozzles and clean as
required. Check for proper orientation.
(This is not required at initial start-up. The nozzles are
clean and set at the factory).
6. Check to ensure drift eliminators are securely in place.
7. Adjust fan belt tension as required. See “Fan Belt
Adjustment” section.
8. Lubricate fan shaft bearings prior to seasonal start-up.
9. Turn the fan(s) and pump(s) by hand to insure it turns
freely without obstructions.
10. Visually inspect the fan blades. Blade clearance should be
approximately 10 mm (6 mm minimum) from tip of blade to
the fan cowl. The fan blades should be securely tightened
to the fan hub.
11. If any stagnant water remains in the system including
“dead legs” in the piping, the unit must be disinfected
prior to the fans being energized. Please refer to ASHRAE
Guideline 12-2000 and CTI Guideline WTP-148 for more
information and consult local legislation prior to start-up.
12. Fill the cold water basin manually up to the overflow
connection.
13. For closed circuit coolers only, fill the heat exchanger coil
with the specified fluid and vent air from the system before
pressurizing, using vents on coil inlets.
14. All new evaporative cooling equipment and associated
piping should be pre-cleaned and flushed to remove
grease, oil, dirt, debris and other suspended solids prior
to operation. Any pre-cleaning chemistry should be
compatible with the cooling equipment’s materials of
construction. Alkaline formulations should be avoided
for systems which include galvanized materials of
construction.
15. Closed hydronic systems connected to either a closed-
circuit cooler or dry cooler should be pre-cleaned and
flushed to remove debris, grease, flash rust, oil, and other
suspended solids prior to operation. Evapco recommends
the use of inhibitor chemistry or inhibited glycol to
minimize corrosion and scale during normal operation.
For eco-WE & eco-W with optional controls, see controls
O&M for proper start up procedure.
After the unit has been energized, check the following:
1. Adjust mechanical float valve as required to the proper
water level.
2. Unit basin should be filled to the proper operating level.
See “Recirculating Water System Operating Levels”
section for more details.
3. Verify fan is rotating in proper direction.
4. Start the spray water pump and check for proper rotation
as indicated by the arrow on the front cover.
5. Measure voltage and current on all three power leads of
pump and fan motor. The current should not exceed the
motor nameplate full load amp rating.
6. Adjust bleed valve to proper flow rate. Consult your
qualified water treatment person to fine tune the minimum
bleed necessary.
7. See fan and pump motor manufacturer maintenance
and long term storage instructions for more detailed
information. The motors should be lubricated and serviced
in accordance with manufacturers instructions.
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