AAON RQ-006 - Manual (Page 25)

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The warranty card must be completed in full
and returned to AAON not more than 3
months after 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.
Packaged Direct Expansion (DX) Units
DX
refrigeration system is factory
assembled, leak tested, charged with
refrigerant and run tested.
Refrigerant system includes an evaporator,
condenser, liquid line filter drier, thermal
expansion
valve (TXV), and scroll
compressor. Compressor is equipped with a
positive pressure forced lubrication system.
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 crankcase heater
cannot prevent refrigerant migration into the
compressor. This means the compressor will
cool down and liquid refrigerant may
accumulate
in the compressor. The
compressor is designed to pump refrigerant
gas and 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 leave the unit off until the
main power switch has been turned on again
for at least 24 hours for units with
compressor crankcase heaters. This will give
the crankcase heater time to clear any liquid
accumulation out of the compressor before it
is started.
Always control the unit from the thermostat,
or control panel, never at the main power
supply, except for servicing, emergency or
complete shutdown of the unit.
During the cooling season, if the air flow is
reduced due to dirty air filters or any other
reason, the cooling coil can get too cold
which will cause excessive liquid to return
CRANKCASE HEATER
OPERATION
Some units are equipped with a
compressor crankcase heater, which
should be energized at least 24 hours
prior to cooling operation, to clear
any liquid refrigerant from the
compressor.
CAUTION
COMPRESSOR CYCLING
5 MINUTE MINIMUM OFF TIME
To prevent motor overheating
compressors must cycle off for a
minimum of 5 minutes.
5 MINUTE MINIMUM ON TIME
To maintain the proper oil level
compressors must cycle on for a
minimum of 5 minutes.
The cycle rate must not exceed 6
starts per hour.
WARNING