AAON RZ Series, Installation Operation & Maintenance

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Connect the suction and liquid copper
connections to the evaporator coil. Reinstall
the expansion valve bulbs and/or the valve
controller on the suction lines.
Depending on the configuration, additional
components might need to be reinstalled.
Evacuate the evaporator section and then
return the refrigerant that was previously
removed from this section.
See Adjusting Refrigerant Charge section to
check for proper sub-cooling and superheat
of the refrigerant systems.
Condenser Fans
Condenser fans are located on top of the unit.
Condenser fans and motors can be removed
and reinstalled as individual assemblies.
Removal
Take off the fan grill by removing the screws
that attach it to the orifice.
Disconnect the condenser fan motor wires.
Remove the screws that attach the orifice to
the condenser assembly.
With the wires disconnected and the screws
removed, the fan, motor and orifice assembly
can be lifted off the unit.
Reinstallation
Set the condenser fan, motor and orifice
assembly back into the condenser assembly
with the motor wires on the side closest to the
control panel.
Attach the orifice to the condenser assembly
using all of the points where screws were
removed.
Reconnect the fan motor wires.
Attach the fan grill at all of the points where
screws were removed.
Evaporative Condenser
Evaporative cooling equipment rejects heat
by evaporating a portion of the recirculated
water spray and discharging it from the unit
with the hot, saturated air. In the right
conditions this can be substantially more
efficient than other condenser setups. This
comes with its set of maintenance.
As the spray water evaporates, it leaves
behind the mineral content and impurities of
the supply water. If these residuals are not
purged from the water distribution system,
they will become concentrated and lead to
scaling, corrosion, sludge build-up and
biological
fouling. A water treatment
monitoring and control system has been
furnished with this unit. Be sure to read the
complete manual that has been furnished. All
water treatment is a combination of bleed
water and chemical treatment for proper
control of the residuals and to prevent any
biological contamination.
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
WARNING
Improper installation, adjustment,
alteration, service, or maintenance
can cause property damage, personal
injury, or loss of life. Startup and
service must be performed by a
Factory Trained Service Technician.
WARNING