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Refrigerant Liquid Line Filter Driers:
Each refrigerant circuit contains a replaceable
core filter drier. Replace when there is excessive
pressure drop across the assembly or moisture is
indicated in a liquid line sight glass.
Table 5 - Liquid Line Filter Drier Pressure Drop
The filter driers are provided with pressure taps
and shutoff valves for isolation when changing the
core. For safety purposes a service manifold must
be attached prior to filter maintenance.
Evaporator/Heat Exchangers:
Normally no maintenance or service work will be
required for a matching direct expansion
evaporator with a thermal expansion valve to
regulate refrigerant.
Lubrication:
All original motors and bearings are furnished
with an original factory charge of lubrication.
Certain applications require bearings be re-
lubricated periodically. The schedule will vary
depending on operating duty, temperature
changes, or severe atmospheric conditions.
Re-lubricate bearings at normal operating
temperatures, but not when running.
Rotate the fan shaft by hand and add only enough
grease to purge the seals. DO NOT
OVERLUBRICATE.
Service Information:
If the unit will not operate correctly and a service
company is required, only a company with service
technicians qualified and experienced in both
condensing units and air conditioning are
permitted to service the systems to keep
warranties in effect. If assistance is required, the
service technician must contact AAON.
Replacement Parts:
Parts for AAON equipment may be obtained from
your local AAON representative. When ordering
parts reference the unit serial number and part
number.
AAON Technical Support
2424 S. Yukon Ave.
Tulsa, OK 74107
Ph: (918) 382-6450
techsupport@AAON.com
www.AAON.com
Note: Before calling, technician must have model
and serial number of the unit available for the
service department to help answer questions
regarding the unit
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