AAON RQ-006 - Manual (Page 46)

46
Common forms of chlorides include:
1. Sea water mist entering an open cooling
tower system.
2. Contaminated make-up water containing
salt water.
3. Disinfecting the water loop with solutions
containing sodium hypochlorite.
Chlorides will result in a premature failure
of the condenser.
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 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 57°F,
during the cooling mode, without the need
for head pressure control. If the EWT is
expected to be lower than 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 are recommended 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 should 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