Specifications

Cat 604-3 37
Engineering Guide Specifications
include overall dBA. Data shall be the highest levels
recorded at all load points.
2.4 CHILLER COMPONENTS
A Compressors:
1 The unit shall utilize magnetic bearing, oil-free, semi-
hermetic centrifugal compressors. The compressor drive
train shall be capable of coming to a controlled, safe stop
in the event of a power failure.
2 The motor shall be of the semi-hermetic type, of
sufficient size to efficiently fulfill compressor
horsepower requirements. It shall be liquid refrigerant
cooled with internal thermal sensing devices in the stator
windings. The motor shall be compatible with variable
frequency drive operation.
a If the compressor design requires a shaft seal to
contain the refrigerant, the manufacturer shall supply
a 20 year parts and labor warranty on the shaft seal
and a lifetime refrigerant replacement warranty if a
seal failure leads to refrigerant loss, or the chiller
manufacturer shall assume all costs to supply and
install a self contained air conditioning system in the
mechanical space sized to handle the maximum heat
output the open drive motor. The energy required to
operate this air conditioning system shall be added to
the chiller power at all rating points for energy
evaluation purposes.
3 The chiller shall be equipped with an integrated Variable
Frequency Drive (VFD) to automatically regulate
compressor speed in response to cooling load and the
compressor pressure lift requirement. Movable inlet
guide vanes and variable compressor speed, shall
provide unloading. The chiller controls shall coordinate
compressor speed and guide vane position to optimize
chiller efficiency.
4 Each compressor circuit shall be equipped with a line
reactor to help protect against incoming power surges
and help reduce harmonic distortion.
5 [OPTION} WME 500, each compressor shall be
equipped with a factory-mounted and wired 460Vpassive
harmonic filter. It shalll be guaranteed to meet the IEEE
Standard 519 for harmonic levels for this application.,
[OPTION} WME 500, each compressor shall be
supplied with a 460V/575V passive harmonic filter for
field-mounting and wiring . It shalll be guaranteed to
meet the IEEE Standard 519 for Isc/IL harmonic levels
for this application
6 Evaporator and Condenser:
1 The evaporator and condenser shall be separate vessels
of the shell-and-tube type, designed, constructed, tested
and stamped according to the requirements of the ASME
Code, Section VIII. The tubes shall be individually
replaceable and secured to the intermediate supports
without rolling.
2 The evaporator shall be flooded type with [0.025 in.] OR
[0.028 in.] OR [0.035 in.] wall, copper tubes rolled into
carbon steel tubesheets. The water side shall be designed
for a minimum of [150 psi] OR [250 psi] OR [350 psi].
The evaporator shall have [dished heads] OR [ marine
water boxes with removable covers] and shall be [carbon
steel] OR [epoxy-coated steel]]. Water connections shall
be [grooved suitable for Victaulic couplings] OR
[flanged connections]. The evaporator shall have [right-
hand] OR [left-hand] connections when looking at the
unit control panel.
3 The condenser shall have [0.025 in.] OR [0.028 in.] OR
[0.035 in.] wall copper tubes rolled into carbon steel.
Water connections shall be [grooved suitable for
Victaulic couplings] OR [flanged]. The water side shall
be designed for a minimum of [150 psi] OR [250 psi] OR
[350 psi]. The condenser shall have [dished heads with
valved drain and vent connections] OR [marine water
boxes with removable covers and vent and drain
connections]. The condenser shall have [right-hand] OR
[left-hand] connections when looking at the unit control
panel.
4 Provide sufficient isolation valves and condenser volume
to hold the full unit refrigerant charge in the condenser
during servicing or provide a separate pumpout system
and storage tank sufficient to hold the charge of the
largest unit being furnished.
5 An electronic expansion valve shall control refrigerant
flow to the evaporator. Fixed orifice devices or float
controls with hot gas bypass are not acceptable because
of inefficient control at low load conditions. The liquid
line shall have moisture indicating sight glass.
6 Re-seating type spring loaded pressure relief valves
according to ASHRAE-15 safety code shall be furnished.
The evaporator shall be provided with single or multiple
valves. The condenser shall be provided with dual relief
valves equipped with a transfer valve so one relief valve
can be removed for testing or replacement without loss
of refrigerant or removal of refrigerant from the
condenser. Rupture disks are not acceptable.
7 The evaporator, [return water head] OR [return and
connection water heads], suction line, and any other
component or part of a component subject to condensing
moisture shall be insulated with UL recognized 3/4 inch
OR 1 ½ inch closed cell insulation. All joints and seams
shall be carefully sealed to form a vapor barrier.
The discharge line shall be factory insulated.
8 Provide factory-mounted and wired, thermal-dispersion
water flow switches on each vessel to prevent unit
operation with no or low water flow.
Octave Band
Overall
dBA
63 125 250 500 1000 2000 4000 8000