AAON RN-140 - Manual (Page 58)

58
Refrigerant-to-Water Heat Exchanger
Condenser water pump, condenser water
piping, cooling tower or geothermal loop,
pressure gauges, strainers, piping insulation
and all components of the waterside piping
must be field installed.
Water-Source Heat Pump Applications
Water-source heat pump units using 100%
outside air must have electric preheat if the
application has a potential for operation with
air entering the indoor coil below 43°F with
a water loop temperature of 70°F.
Open Loop Applications
This product contains one or more
refrigerant-to-water heat exchangers made
of 316 Stainless Steel. 316 Stainless Steel is
subject to severe corrosion and failure when
exposed to chlorides.
Do not allow water containing any form of
chlorides to enter this heat exchanger.
Common forms of chlorides include:
1. Sea water mist entering an open cooling
tower system.
2. Contaminated makeup 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.
OPEN LOOP APPLICATIONS
SMO 254 brazed plated refrigerant-
to-water
heat exchangers are
recommended with all open loop
applications. Failure to use a SMO
254 heat exchanger may result in
premature failure of your system and
possible voiding of the warranty.
WARNING
OPEN LOOP APPLICATIONS
Failure of the condenser as a result
of chemical corrosion is excluded
from coverage under AAON Inc.
warranties and the heat exchanger
manufacturer’s warranties.
WARNING
WATER-SOURCE HEAT
PUMP APPLICATIONS
Water-source heat pump units using
100% outside air must have electric
preheat if the application has a
potential for heat pump heating
operation with air entering the indoor
coil below 43°F with an entering
water loop temperature of 70°F.
CAUTION