Evaporative Cooling - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Evaporative Cooling Maintenance
Regularly scheduled maintenance is the key to peak
performance, minimized cost, and extended life of the
evaporative cooler. The following is a checklist of items
that need to be looked at on a regular basis.
1. The media should be checked for mineral and
foreign material deposits that have built up. If
these items are left on the media, the life and
performance of the unit will be greatly reduced.
Also, there are risks of water carryover when
this type of condition exists. When signs of
mineral build-up are noticed, you should increase
the bleed off rate. If this does not solve the
problem, chemicals may need to be added to
the water. The evaporative pads tend to be self-
cleaning. Depending on water quality and system
maintenance, the useful life of the pads should be 3
to 5 years.
2. The media should be periodically brushed lightly
with a soft bristle brush in an up and down motion
(never brush side-to-side) while flushing with water.
This will also aid in reducing the amount of foreign
material build-up.
3. The water should be shut off and all the lines
drained when the temperature drops below 50°F.
4. When the evaporative cooler is going to be used for
the first time each season, it is recommended that
the media be flushed with clean water for a period
of 2 minutes.
5. At the beginning of each cooling season, the
upright recirculating pump should have the shaft
oiled and spun to eliminate the potential of seizing
and pump burn out.
6. If the cooling media was removed from the unit,
check to make sure that is not installed backwards.
If the media is installed backwards, there will be
large amounts of water carry over downstream of
the evaporative cooler. Continuous operation in this
manner may cause serious damage and void the
warranty.
7. At the end of each cooling season the evaporative
cooler should be thoroughly cleaned. A dispersant
and biocide (consult water treatment consultant
for suitable materials and dosage levels) should be
recirculated for 12 to 24 hours prior to performing
the following steps:
a. Disconnect power to unit.
b. Shut off all water to the unit.
c. Open evaporative cooling section door.
d. Flush distribution headers and media for
20 minutes.
e. Turn off pumps and drain all water distribution
piping, headers, etc.
f. Dry media completely by running blowers.
g. Brush media as described in Step 2 and
repeat steps 7d and 7e.
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h. Clean all remaining components (i.e. sump,
pump, etc.) of any mineral deposits or foreign
materials.
i. Replace all worn or non-functioning parts.
j. Reassemble the cooling unit.
k. Close cooling section door.
l. Turn the main disconnect 'ON', leaving the
cooling switch in the 'OFF' position.
8. If the evaporative cooler will be turned off during
the cooling season for an extended period of time,
it is recommended that the media be dried out.
This can be accomplished by allowing the blowers
to continue to run for one to two hours. Doing so,
will prevent organic build-up on the media and
subsequent odors getting into the space.
9. Media should be permitted to dry once per week
by allowing the blowers to run for one to two hours.
IMPORTANT
Replacement media should be from the same
manufacturer and be the same size as the original
media provided with the unit.
10. A flush cycle should be performed weekly for one
hour with the fans off.
To remove media, disconnect water line to evap header
as shown below. Then slide media section out of unit.
Sump will remain in unit. If media is wet, turn off water
supply, then turn on unit and allow air to flow thru media
for 10 -20 minutes. This will dry the media out and make
it lighter and easier to handle.
Energy Recovery Ventilator with Heating and Cooling General Description - NOT model specific 45