AAON RL-240 - Manual (Page 23)

23
Receiving Unit
When received, the unit should be checked
for damage that might have occurred in
transit. If damage is found, it should be
noted on the carrier’s Freight Bill. A request
for inspection by carrier’s agent should be
made in writing at once. Nameplate should
be checked to ensure the correct model sizes
and voltages have been received to match
the job requirements.
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
All DX refrigeration systems are factory
assembled, leak tested, charged with
refrigerant, and run tested.
All refrigerant systems include evaporator
and condenser coils. Each unit includes
liquid line filter driers, thermal expansion
valves (TXV), and scroll compressors.
Compressors are equipped with a positive
pressure forced lubrication system.
Never turn 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 heaters
cannot prevent refrigerant migration into the
compressors. This means the compressor
may 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 liquid enters the compressor.
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
The Clean Air Act of 1990 bans the
intentional venting of refrigerant as of
July 1, 1992. Approved methods of
recovery, recycling, or reclaiming
must be followed.
CAUTION
Failure to observe the following
instructions will result in premature
failure of your system and possible
voiding of the warranty.
WARNING
Coils and sheet metal surfaces
present sharp edges and care must
be taken when working with this
equipment.
WARNING
CRANKCASE HEATER
OPERATION
Some 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.
CAUTION