Application Considerations - Trane CGAD020C Manual

Unit Sizing
Unit capacities are listed in the Perfor-
mance Data section. Intentionally over-
sizing a unit to assure adequate capacity is
not recommended. The excess in the
system and compressor capacity calcula-
tion results in an over-sized liquid chiller. In
addition, an oversized unit is usually more
expensive to purchase, install and operate.
If over-sizing is desired, consider using two
units.
Unit Placement
1
Setting the Unit
2
Isolation and Sound Transmissions
The most effective isolation solution is to
locate the unit away from any sound
sensitive area. Structurally transmitted
sound can be reduced by vibration
eliminators. Spring isolators have proved
to be of little efficiency in CGAD Air-Cooled
Liquid Chiller installations and thus are not
recommended. An acoustical engineer
should always be consulted on applica-
tions with critical acoustic reduction levels.
For maximum isolation, water lines and
electrical conduits should also be isolated.
Wall sleeves and rubber-isolated piping
hangers can be used to reduce the sound
transmitted through water piping. To
reduce the sound transmitted through
electrical conduits, use flexible electrical
conduits. State and local codes on sound
emissions should always be considered.
As the environment in which a sound
source is located affects the sound
pressure, unit placement must be
carefully evaluated.
4
Unit Location
A
General
Unobstructed airflow for the condenser is
essential to assure efficient operation and
the liquid chiller capacity. When determin-
ing unit placement, careful considerations
must be given to assure enough air flow
across the condenser heat-transfer
surface.
CG-PRC002A-EN
Application
Considerations
Two conditions should be avoided in order
to achieve optimum performance: warm air
recirculation and coil starvation.
Warm air recirculation occurs when the
airflow from the condenser fans discharged
back at the condenser coil inlet, due to
installation site restrictions.
D - Provide enough clearance between devices
E - Installations in locations surrounded by walls
Coil starvation occurs when the free airflow
to the condenser coil is restricted. Both
warm air recirculation and coil starvation
cause reductions in unit efficiency and
capacity, due to the associated high
discharge pressures. See page 24 (Mainte-
nance and air circulation clearances).
B - Provide Vertical Clearance
C - Provide Side Clearance
7