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Performance: Improper location of the evaporative
condenser may seriously degrade the capacity of the
equipment. Make sure the equipment is located such
that discharge air from the condenser does not enter the
condenser air inlet.
Warranties - Please refer to the limitation of warranties
in effect at the time of purchase.
Condenser Tube Inspection - The coil is leak tested at
350 P.S.I.G. before shipment. AAON will not be respon-
sible for loss of refrigerant. It is the responsibility of the
installer to verify that the system is sealed before charg-
ing with refrigerant. If the unit is operated during low
ambient temperature conditions, freeze protection for
the recirculating water system must be provided.
EVAP. CONDENSER SECTION - cont.
Cleanliness: Dirt and debris may accumulate in the
sump during shipping and storage. The sump should be
cleaned prior to start-up to prevent clogging the water
distribution system. Any surfaces that show contamina-
tion should be cleaned ONLY with a commercial stainless
steel cleaner to restore the initial appearance. The inlet
screens should be inspected for foreign material.
Freeze Protection: In order to prevent water tempera-
tures from dropping below 50°F, this unit is equipped
with a VFD on the fan motors when the refrigeration
system is operating.
Recirculating Water System: Electric sump heaters
are available to keep the sump water from freezing when
the refrigeration system is not operating. An electric
resistance heater is supplied in the vestibule when sump
heaters are selected.
The condenser should not be operated with the fan
on and the pump cycled on and off to maintain head
pressure control under any conditions. The unit is
equipped with a water temperature controller which
varies fan speed to maintain sump water tempera-
ture. This unit is not equipped with a compressor
discharge pressure controller for fan speed modu-
lation and therefore can not be operated without
water flow.
PRE START-UP: Do not start the evaporative con-
denser or compressors without installation of proper
water treatment chemicals. Contact your local
water treatment expert for correct selection of wa-
ter treatment chemical, adjustment of chemical
feed and bleed rates.
Pump Operation: Before initial start of the pump,
check as follows:
1. Be sure that pump operates in the direction
indicated by the arrow on the pump casing.
Check rotation each time motor leads have been
disconnected.
2. Check all connections of motor and starting device
with wiring diagram. Check voltage, phase and
frequency of line circuit with motor name plate.
3. Check suction and discharge piping and pressure
gauges for proper operation.
4. Turn rotating element by hand to assure that it
rotates freely.
Running - Periodically inspect pump while running, but
especially after initial start-up and after repairs.
1. Check pump and piping for leaks.
Repair immediately.
2. Record pressure gauge readings for future reference.
3. Record voltage, amperage per phase, and kW.
Fan Motors: AAON Evaporative Condensers are
equipped with direct drive fan motor(s). Check fan is
tightly mounted to the motor shaft and the motor mount-
ing bolts are aligned and secure.
Water Make-up Valve: Adjust the float level during the
initial fill so the valve is completely closed when the
water level is 1/2" below overflow level. Make-up water
supply pressure should be maintained between 15 and 60
psig for proper operation of the valve. The valve assembly
should be inspected monthly and adjusted as required.
Replace the valve seat if leakage occurs when the valve is
in the closed position.
MAINTENANCE RECOMMENDATIONS
Pump Maintenance:
Cleaning - Remove oil, dust, water, and chemicals from
exterior of motor and pump. Keep motor air inlet and
outlet open. Blow out interior of open motors with clean
compressed air at low pressure.
Labeled Motors - It is imperative for repair of a motor
with Underwriters’ Laboratories label that original clear-
ances be held; that all plugs, screws, other hardware be
fastened securely, and that parts replacements be exact
duplicates or approved equals. Violation of any of the
above invalidates Underwriters’ Label.
Fan Motor Maintenance: Same as pump maintenance.
Access Doors: If scale deposits or water is found around
the access doors, adjust door for tightness. Adjust as
necessary until leaking stops when door is closed.
Bearings - Lubrication: Every 6 months or after a
prolonged shut down. Use waterproof, lithium based grease.
Below 32°F - Esso Exxon or Beacon 325. Above 32°F - Mobil
Mobilox EP2, Shell Alvania EP2 or Texaco RB2.
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