may have been placed inside the unit cabinet
for security. Installers and owners should
secure all doors with locks or nuts and bolts
to prevent unauthorized access.
The warranty card must be completed in full
and returned to AAON not more than 3
months after the unit is delivered.
Storage
If installation will not occur immediately
following delivery, store equipment in a dry
protected area away from construction
traffic and in the proper orientation as
marked on the packaging with all internal
packaging in place. Secure all loose-shipped
items.
Direct Expansion (DX) Condensing Units
CB Series condensing units are factory
assembled and wired, including a full charge
of R-410A refrigerant for up to 25 feet of
line set. Systems with the modulating hot
gas reheat option will require refrigerant to
be field added because of the additional
refrigerant components and piping
associated with the system.
Failure to observe the following instructions
may result in premature failure of your
system, and possible voiding of the
warranty.
Never cut off the main power supply to the
unit, except for servicing, emergency, or
complete shutdown of the unit. When power
is cut off from the unit, compressors using
crankcase heaters cannot prevent refrigerant
migration. This means the compressor may
cool down and liquid refrigerant may
accumulate in the compressor. Since the
compressor is designed to pump refrigerant
gas, damage may occur when power is
restored.
If power to the unit must be off for more
than an hour, turn the thermostat system
switch to “Off”, or turn the unit off at the
control panel, and then cut off the main
power supply. Leave the unit off until the
main power supply has been turned on again
for at least 24 hours. This will give the
crankcase heater time to clear any liquid
accumulation out of the compressor before it
is required to run.
Always control the system from the
thermostat, or control panel, never at the
main power supply, except for servicing,
emergency, or complete shutdown of the
unit.
The standard compressors must be on a
minimum of 5 minutes and off for a
minimum of 5 minutes. The cycle rate must
be no more than 6 starts per hour.
The variable capacity compressors must be
on a minimum of 3 minutes and off for a
minimum of 3 minutes. The cycle rate must
be no more than 10 starts per hour.
The compressor life will be seriously
shortened by reduced lubrication, and the
pumping of excessive amounts of liquid oil
and liquid refrigerant.
CRANKCASE HEATER
OPERATION
Units are equipped with compressor
crankcase heaters, which should be
energized at least 24 hours prior to
cooling operation, to clear any liquid
refrigerant from the compressors.
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