Spring Start-Up - naks 7300 DD Guia De Inicio Rapido

• Install float and attach water line to
float. The float may be installed in either
the corner post or bracket (see Fig. 9). If
you have model 7300DD then the float
should be mounted to the bracket. Refer
to figure 10 for installation instructions.
Insert the float (1) thru the hole in the
corner post or bracket. Install the
washer (2) and nut (3). Tighten to keep
the float from turning. Place the nut (5)
and ferrule (4) on the water supply line.
Connect to float fitting and tighten until
watertight.
• Fill pan. Allow water to fill to
within 1" of top of pan and adjust
float to maintain this water level.
This can be accomplished by bend-
ing the float rod.
• Level water troughs.
Operate
pump until pads are saturated.
Check each trough to see if water
is evenly dispersed in the trough.
If they are not, loosen adjustment
bolts and level trough. Retighten
bolts. Check to see that all pads
are saturated with water and that
there are no dry spots or openings
in the pads.
Bleed-Off
Installation of the bleed-off kit is recommended to increase the life of the
cooler. A bleed-off system is designed to prevent scale build up by continu-
ally removing a small percent of the water in the pan.
• Install Bleeder Tee and Tubing.
Refer to figure 11. Cut the pump
hose and insert the barbed ends
of the bleeder tee into each cut
end. Insert one end of the bleeder
tubing onto the bleeder tee and
run the other end out of the cooler
through the overflow pipe. Note: A
restrictor clamp is provided which,
if desired, may be installed onto the
bleeder tubing to restrict the amount of water being bled off. The amount
of water to bleed off depends on the quality of the water in your area. Start
with 1-2 gal/hr and increase if needed.
Amperage Draw and Belt Tension
This unit is equipped with an adjustable motor drive pulley for adjusting
the blower wheel speed to the proper loading on different duct systems. It
is important that the motor drive pulley is adjusted to correct size to assure
maximum air delivery without damage to the motor. Be sure to follow these
instructions carefully.
• Adjust drive pulley. After the unit is completely installed, adjust the drive
pulley to the least diameter and adjust belt tension. See the maintenance
section for adjusting belt tension.
• Start cooler. Install all pad frames, start pump, and allow to operate until
pads are wet.
• Check amperage. With pads wet and unit started, check amperage draw
with an amperage meter.
• Adjust pulley if necessary. If amperage
draw is less than motor rating, turn off elec-
trical power and remove pad frame. Unplug
motor inside cooler, this will protect you
from someone turning on unit while you are
working inside. This should be done for your
Faucet
Sillcock
Fig. 8
Corner
Bracket
Post
Float
Fig. 9
5
4
3
2
1
Fig. 10
Pump Hose
Bleeder Tee
Bleeder Tubing
Restrictor
Overflow
Fig. 11
Decrease
Amperage
Fig. 12
safety. Adjust pulley to a larger diameter and readjust belt tension, plug
motor in, install pad frame, and retest amperage draw. Repeat this process
until correct amperage draw is attained. Increasing motor pulley diameter
increases amperage draw. Decreasing motor pulley diameter decreases
amperage draw (see Fig. 12).
CAUTION:
Do not operate cooler with larger amperage draw
than specified on motor plate.
NOTE: No attempt should be made to completely install this unit without
the aid of an electrician or someone familiar with testing amperage draw.
Failure to comply with these instructions may void your warranty.
WARNING
Before doing any maintenance, be sure power is
:
off. At the time you remove a pad frame be sure to unplug motor
and pump. This is for your safety.

Spring Start-Up

• Clean pump. Cleaning the pump is necessary once a year at start-up. For
your safety, turn unit off and unplug motor and pump. Remove the pump
6
from the mount slot. Remove the base of the pump (Fig. 13). Clean the
pump and turn the impeller to ensure free operation. Remove the pump
spout and check for any blockage.
After cleaning, reinstall the base
onto the pump.
make sure it is secure. Reattach
the pump to the mount in the cooler
using the plastic retainer to ensure
that the pump will not overturn. Do
not forget to replace the spout and
water delivery tube onto the pump
outlet.
• Oil bearings. The blower bearings and cooler motor in this unit should be
oiled with a few drops of non-detergent 20/30 weight oil once each year.
The motor does not need oil if it has no oil lines for oiling. Motors that
have no lines are lifetime oiled at the factory and require no further oiling
for the life of the unit.
CAUTION:
Do not over oil. Over oiling can cause motor burn
out, due to excessive oil getting into motor winding.
• Change Pads. The pads should be replaced once or twice a season, de-
pending upon the length of the season. At the beginning and at mid-season
a clean pad is more absorbent and efficient and will deliver substantially
more cool air.
• Check belt tension. A 3 lb. force should
deflect the belt 3/4 inches (see Fig. 14).
Readjust belt if needed.
• Check bleed-off valve to be sure it is
not clogged.
WINTER SHUTDOWN
• Drain water. Always drain all of the water out of the cooler and water
supply line when not in use for prolonged periods, and particularly at the
end of the season. Keep the water line disconnected from both the unit
and water supply so that it does not freeze.
• Unplug motor and pump. When cooler is not used for extended periods,
unplug the motor and pump from inside cooler.
• Cover unit. To protect the life of the finish, a cover for the unit is suggested
in extended periods of non-use.
By following the operating, installation, and maintenance suggestions as
outlined, you can get many years of efficient and satisfactory service from
your cooler.
-3-
Maintenance
Remove
Press firmly to
Base
Impeller
Fig. 13
3 Lb.
3/4 Inches
Fig. 14