64
Evaporative Condenser Installation
Evaporative Condensers require two field
water connections for installation:
City
Makeup Water Connection
and Drain
Connection. City Makeup Water uses a 3/4”
FPT connection. The Drain uses 2” PVC
socket connection. Connect the drain to a
sanitary sewer or other code permitted drain.
These connections can go through the base or
the wall of the unit, depending on the
configuration of the unit.
Temporary Drain-Evaporative
Condenser
The evaporative condenser design is not
sealed to the outdoors. Some rainwater might
enter the sump tank during transportation.
AAON provides a temporary drain system
while the unit is in transit. The temporary
drain consist of an adapter that will connect a
hose from the sump drain to the base drain.
This temporary drain must be replaced by
permanent draining piping once on site.
Figure 30 - Temporary Drain Components
Once the unit is ready for permanent
draining, close the valve and remove the
temporary draining system. The components
that must be removed are those with number
callouts in Figure 30. The drain connection
for the permanent draining is 2” PVC.
Condenser Tube Inspection
The coil is leak tested at 450 P.S.I.G. before
shipment. AAON will not be responsible for
loss of refrigerant. It is the responsibility of
the installer to verify that the system is sealed
before charging with refrigerant. If the unit is
operated during low ambient temperature
conditions,
freeze protection
for
the
recirculating water system must be provided.
Evaporative Condenser Operation
Pre Start-Up
Do not start the evaporative condenser or
compressors without installation of proper
water treatment chemicals. Contact your
local water treatment expert for correct
selection of water treatment chemical,
adjustment of chemical feed and bleed rates.
Cleanliness
Dirt and debris may accumulate in the sump
during shipping and storage. The sump must
be cleaned prior to start-up to prevent
clogging the water distribution system. Any
surfaces that show contamination must be
cleaned ONLY with a commercial stainless
steel cleaner to restore the initial appearance.
The inlet screens must be inspected for
foreign material.
Freeze Protection
In order to prevent water temperatures from
dropping below 50°F during operation, this
unit is equipped with a VFD controls for the
condenser fans.
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.
Note:
The condenser must 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 temperature.
Summary of Contents for RZ Series
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Page 31: ...31 Figure 4 4 Point Lift RZ Series Air Cooled Condenser Unit ...
Page 90: ...90 Gas Heater Operating Instructions ...
Page 108: ...108 Maintenance Log E Coated Coil ...
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