AAON RQ NextGen Series, Installation Operation & Maintenance

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Failure of the condenser as a result of
chemical corrosion is excluded from
coverage under AAON warranties and the
heat exchanger manufacturer warranties.
Failure of the condenser will allow water to
enter the refrigerant circuit and will cause
extensive damage to the refrigerant circuit
components. Any damage to the equipment
as a result of condenser failure from chemical
corrosion due to the fluid in the condenser is
excluded from coverage under AAON
warranties and the heat exchanger
manufacturer warranties.
Freezing Water in the Heat Exchanger
This product contains one or more
refrigerant-to-water heat exchangers. A
refrigerant-to-water heat exchanger contains
refrigerant in one passage and water in
another passage. Water is subject to freezing
at 0 ° C (32°F). When water freezes in a heat
exchanger significant forces are exerted on
the components of the heat exchanger where
the water is confined.
Failure of the condenser due to freezing will
allow water to enter the refrigerant circuit and
will cause extensive damage to the
refrigerant circuit components. Any damage
to the equipment as a result of water freezing
in the condenser is excluded from coverage
under AAON warranties and the heat
exchanger manufacturer warranties.
Unit is capable of operating with Entering
Water Temperatures (EWT) as low as 13.9°C
(57°F), during the cooling mode, without the
need for head pressure control. If the EWT is
expected to be lower than 13.9°C (57°F) or a
more stable operation is desired, a factory
provided head pressure control water valve
option is available.
OPEN LOOP APPLICATIONS
Cupronickel refrigerant-to-water heat
exchangers must be used with all
open loop applications. Failure to use
a Cupronickel heat exchanger may
result in premature failure of your
system and possible voiding of the
warranty.
WARNING
Cleaning the cooling tower or
condenser water loop with harsh
chemicals such as hydrochloric acid
(muriatic acid), chlorine or other
chlorides, can damage the refrigerant-
to-water heat exchanger. Care must
be taken to avoid allowing chemicals
to enter the refrigerant-to-water heat
exchanger. See Appendix A - Heat
Exchanger Corrosion Resistance for
more information.
CAUTION
WATER FREEZING
Failure of the condenser due to
freezing will allow water to enter the
refrigerant circuit and will cause
extensive damage to the refrigerant
circuit components. Any damage to
the equipment as a result of water
freezing in the condenser is excluded
from coverage under AAON
warranties and the heat exchanger
manufacturer warranties.
WARNING