Specifications

38 Cat 604-5
Engineering Guide Specifications
b If the compressor/motor uses any form of antifriction
bearing (roller, ball, etc), the chiller manufacturer
shall provide the following at no additional chaarge:
a A 20-year bearing warrenty and all preventative
manitenance as specified by the maunfacturer’s
published maintenance instructions.
b At start up a three-axis vibration analysis and
written report to establish bearing condition
baseline.
c An annual three-axis vibration analysis and
written report indicating bearing condition.
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 M2 motor, The chiller shall be
equipped with a factory-mounted and wired 460Vpassive
harmonic filter guaranteed to meet the IEEE Standard
519 at an Isc/IL ratio less than 20.
[OPTION} WME 500 M2 motor, The chiller shall be
supplied with a 460V or 575V passive harmonic filter
shipped loose for field-mounting and wiring . It shalll be
guaranteed to meet the IEEE Standard 519 at an Isc/IL
ratio less than 20.
B 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 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.
5 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.
6 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.
7 Provide factory-mounted and wired, thermal-dispersion
water flow switches on each vessel to prevent unit
operation with no or low water flow.
C Vibrations
1 Provide neoprene waffle-type vibration isolators for each
corner of the unit.
D Power Connections
• Power connection shall be single point to a factory-
mounted disconnect switch OR shall be multipoint to
each compressor power panel on two-compressor units.
E Chiller Control
1 The unit shall have a microprocessor-based control
system consisting of a 15-inch VGA touch-screen
operator interface and a unit controller.
2 The touch-screen shall display the unit operating
parameters, accept setpoint changes (multi-level
password protected) and be capable of resetting faults
and alarms. The following parameters shall be displayed
on the home screen and also as trend curves on the trend
screen: