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RLC-PRC016-EN16
Application
Considerations
Application Considerations
Certain application constraints should be
considered when sizing, selecting and
installing Trane air-cooled Series R
™
chillers. Unit and system reliability is
often dependent upon properly and
completely complying with these
considerations. Where the application
varies from the guidelines presented, it
should be reviewed with your local
Trane sales engineer.
Unit Sizing
Unit capacities are listed in the
performance data section. Intentionally
oversizing a unit to assure adequate
capacity is not recommended. Erratic
system operation and excessive
compressor cycling are often a direct
result of an oversized chiller. In addition,
an oversized unit is usually more
expensive to purchase, install, and
operate. If oversizing is desired, consider
using two units.
Unit Placement
1. Setting The Unit
A base or foundation is not required if
the selected unit location is level and the
base is strong enough to support the
unit’s operating weight as listed in Tables
W-1 and W-2.
2. Isolation and Sound Emission
The most effective form of isolation is to
locate the unit away from any sound-
sensitive area. Structurally transmitted
sound can be reduced by
ELASTOMERIC vibration eliminators.
Spring isolators have proven to be of
little benefit on air-cooled Series R
™
chiller installations and are not
recommended. An acoustical engineer
should always be consulted in critical
sound applications.
For maximum isolation effect, water
lines and electrical conduit 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 conduit,
use flexible electrical conduit.
State and local codes on sound
emissions should always be considered.
Since the environment in which a sound
source is located affects sound pressure,
unit placement must be carefully
evaluated. Sound power levels for Trane
air-cooled Series R
™
chillers are available
on request.
3. Servicing
Adequate clearance for evaporator and
compressor servicing should be
provided. Recommended minimum
space envelopes for servicing are
located in the dimensional data section
and can serve as a guideline for
providing adequate clearance. The
minimum space envelopes also allow
for control panel swing and routine
maintenance requirements. Local code
requirements may take precedence.
4. Unit Location
a. General
Unobstructed flow of condenser air is
essential to maintain chiller capacity and
operating efficiency. When determining
unit placement, careful consideration
must be given to assuring a sufficient
flow of air across the condenser heat
transfer surface. Two detrimental
conditions are possible and must be
avoided if optimum performance is to be
achieved: warm air recirculation and coil
starvation.
Warm air recirculation occurs when
discharge air from the condenser fans is
recycled back to the condenser coil inlet.
Coil starvation occurs when free airflow
to (or from) the condenser is restricted.
Both warm air recirculation and coil
starvation cause reductions in unit
efficiency and capacity because of the
higher head pressures associated with
them. The air-cooled Series R
™
chiller
offers an advantage over competitive
equipment in these situations.
Performance is minimally affected in
many restricted air flow situations due to
its unique condensing coil geometry.
Also, through its advanced Adaptive
Control
™
microprocessor logic, the
chiller will attempt to stay on-line where
competitive chillers would usually shut
down.
Trane’s unique Adaptive Control
microprocessor has the ability to
understand the operating environment
of the chiller and adapt to it by first
optimizing its performance and second,
staying on line through abnormal
conditions. For example, high ambient
temperatures combined with a restricted
air flow situation will generally not cause
the air-cooled Series R
™
chiller to shut
down. Competitive chillers would
typically shut down on a high pressure
nuisance cut-out in these conditions.
Debris, trash, supplies, etc. should not be
allowed to accumulate in the vicinity of
the air-cooled Series R
™
chiller. Supply
air movement may draw debris into the
condenser coil, blocking spaces between
coil fins and causing coil starvation.
Special consideration should be given to
low ambient units. Condenser coils and
fan discharge must be kept free of
obstructions to permit adequate airflow
for satisfactory unit operation.