Catalogue

12 RLC-PRC042D-EN
Application Considerations
therefore, are recommended for sound sensitive installations. An acoustical engineer should
always be consulted on critical 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 sound transmitted through water
piping. To reduce the sound transmitted through electrical conduit, use flexible electrical conduit.
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 chillers are available on request.
Servicing
Adequate clearance for evaporator, condenser 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 door swing and routine maintenance requirements. Local
code requirements may take precedence.
Unit Location
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 assure a
sufficient flow of air across the condenser heat transfer surface. Two detrimental conditions are
possible and must be avoided: warm air recirculation and coil starvation. 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 the condenser is restricted.
Condenser coils and fan discharge must be kept free of snow or other obstructions to permit
adequate airflow for satisfactory unit operation. Debris, trash, supplies, etc., should not be allowed
to accumulate in the vicinity of the air-cooled chiller. Supply air movement may draw debris into
the condenser coil, blocking spaces between coil fins and causing coil starvation.
Both warm air recirculation and coil starvation cause reductions in unit efficiency and capacity due
to higher head pressures. The air-cooled RTAE chiller offers an advantage over competitive
equipment in these situations. Operation is minimally affected in many restricted air flow situations
due to its advanced Adaptive Control™ microprocessor which has the ability to understand the
operating environment of the chiller and adapt to it by first optimizing its performance and then
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 model RTAE chiller to shut
down. Other chillers would typically shut down on a high pressure nuisance cut-out in these
conditions.
Figure 4. Installation example
Piping isolation
Isolators
Chilled water piping
should be supported
Isolators
Flexible
electrical
conduit
Concrete Base