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PKG-PRC010-EN
Application
Considerations
6
CCRA Unit Location
Unobstructed condenser airflow is
essential to maintain capacity and
operating efficiency. When determining
unit placement, give careful consider-
ation to assure sufficient airflow across
the condenser coils. Avoid these two
detrimental conditions: warm air recircu-
lation and coil starvation.
Both warm air recirculation and coil
starvation cause reductions in unit
efficiency and capacity because of the
higher head pressure associated with
them. In more severe cases, nuisance
unit shutdowns will result from excessive
head pressures.
Clearance
Ensure vertical condenser air discharge is
unobstructed. While it is difficult to
predict the degree of warm air recircula-
tion, a unit installed with a ceiling or
other obstruction above it will experience
a capacity reduction that will reduce the
maximum ambient operation. Nuisance
high head pressure tripouts may also
occur.
The coil inlet must also be unobstructed.
A unit installed closer than the minimum
recommended distance to a wall or other
vertical riser will experience a combina-
tion of coil starvation and warm air
recirculation. This may result in unit
capacity and efficiency reductions, as
well as possible excessive head pres-
sures. Reference the service clearance
section on page 45 for recommended
lateral distances.
Ambient Limitations
Standard ambient control allows opera-
tion down to 45°F (7.2°C) with cycling of
condenser fans. Units with the low
ambient option are capable of starting
and operating in ambient temperatures
down to 0°F (-17.8°C). Optional low
ambient units use a condenser fan
damper arrangement that controls
condenser capacity by modulating
damper airflow in response to saturated
condenser temperature.
Maximum cataloged ambient tempera-
ture operation of a standard condenser is
115°F (46.1°C). Operation at design
ambient above 115°F can result in
excessive head pressures. For operation
above 115°F, contact the local Trane sales
office.
CCRA Air-Cooled
Condenser