Jetson FWCD Series, Installation Operation & Maintenance, Page: 44 / 96

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with respect to the NPLV rating of the
equipment under consideration. Larger future
loading requirements may cause temporary
oversizing of equipment that is initially
selected and installed. This should be done
with care, although the FWCD Series array
chiller, with multiple scroll compressors, is
more tolerant than designs that use a single
compressor or a few larger compressors.
Chiller Placement
The FWCD Series water-cooled chillers are
designed for indoor installations that remain
above 32°F and below 125°F at all times.
Locate the chiller away from sound-sensitive
areas on a level foundation or flooring strong
enough to support 150 percent of the operating
weight and large enough to keep with service
clearances. Also, the chiller foundation or
flooring must be rigid enough to minimize
vibration transmission. Please see General
Data chapter for compressor sound data and
Dimension and Weights information for unit
operating weights and clearances. If necessary,
options are available for sound attenuation and
vibration reduction.
Be sure to observe the dimensions that are on
the rating plate of the chiller for operational
and service clearances. For proper unit
operation, the immediate area must remain free
of debris Table A4 displays the typical
clearances found on the rating plate of each
unit.
Table 9 Service Clearances
Location Required Recommended
Back
0” 24”
Front
42” 53”
Left
0”
36"
Right 0” 36"
Top
36” 36”
Mounting Isolation
Anytime vibration transmission may be a
factor, vibration isolators may be considered.
Rubber isolators are available as factory
provided options.
Electrical Power Supply
A disconnect switch that is accessible from the
outside of the cabinet is an available option
factory
installed. The microprocessor
controller furnished with the unit is supplied
with its own power supply factory wired to the
main power of the chiller. The voltage to the
chiller must be within plus or minus 10% of the
nameplate rating value on the unit. All FWCD
Series chiller arrays are available with a single
point power supply or each module may be
powered individually. The largest capacity
single point power supply terminal supplied
from Jetson is rated at 1200 amps.
Optional Oversized Evaporator
These heat exchangers are available on all
model sizes except the 85 ton. They may be
selected for improved performance with water
or they may be selected for use with systems
that contain glycol to aid in offsetting the
decreased capacity due to the thermal
properties of glycol. Oversized evaporators
also allow a 40F leaving water temperature
without the requirement for glycol.
Air-Cooled Condenser Applications
The FWCD Series chillers can be paired with
remote air-cooled condensers. The minimum
outdoor ambient temperature for operation of a
FWCD
Series compressor chiller in
combination with an outdoor condenser is
20°F. This minimum is driven by compressor
chiller starting considerations and not by
effectiveness of condenser ambient controls
once the system is up and running. Fan cycling
and optional low ambient dampers do
not
mitigate the low ambient starting problem. On
a cold day with outdoor ambient temperature
below 20°F the liquid line pressure at the