Specifications

38 Cat 604-3
Engineering Guide Specifications
B Vibrations
1 Provide neoprene waffle-type vibration isolators for each
corner of the unit.
C Unit shall be bagged and mounted on skids for shipment.
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:
• Entering and leaving chilled water temperatures
• Entering and leaving condenser water temperatures
• Evaporator saturated refrigerant pressure
• Condenser saturated refrigerant pressure
• Percent of 100% speed (per compressor)
• % of rated load amps for entire unit
3 In addition to the trended items above, all other
important real-time operating parameters shall also be
shown on the touch-screen. These items shall be
displayed on a chiller graphic showing each component.
At a minimum, the following critical areas must be
monitored:
• Compressor actual speed, maximum speed, percent
speed
• Evaporator water in and out temperatures, refrigerant
pressure and temperature
• Condenser water in and out temperatures, refrigerant
pressure and temperature
• Liquid line temperature
• Chilled water setpoint
• Compressor and unit state and input and output digital
and analog values
4 A fault history shall be displayed using an easy to
decipher, color coded set of messages that are date and
time stamped. The alarm history shall be downloadable
from the unit's USB port. An operating and maintenance
manual specific for the unit shall be viewable on the
screen.
5 All setpoints shall be viewable and changeable (multi-
level password protected) on the touch screen and
include setpoint description and range of set values.
6 Automatic corrective action to reduce unnecessary
cycling shall be accomplished through preemptive
control of low evaporator or high discharge pressure
conditions to keep the unit operating through abnormal
transient conditions.
7 The chiller shall be capable of cycling and loading up to
seven other similar chillers through a local network and
also provide automatic control of: evaporator and
condenser pumps (primary and standby), up to 3 stages
of cooling tower fan cycling control and a tower
modulating bypass valve or cooling tower fan variable
frequency drive.
8 Optionally, the factory mounted controller(s) shall
support operation on a BACnet®, Modbus® or
LONWORKS® network via one of the data link /
physical layers listed below as specified by the
successful Building Automation System (BAS) supplier.
• Modbus
• BACnet MS/TP master (Clause 9)
• BACnet IP, (Annex J)
• BACnet ISO 8802-3, (Ethernet)
• LonTalk® FTT-10A. The unit controller shall be LON-
MARK ® certified.
9 The information communicated between the BAS and
the factory mounted unit controllers shall include the
reading and writing of data to allow unit monitoring,
control and alarm notification as specified in the unit
sequence of operation and the unit points list.
10 For chillers communicating over a LONMARK network,
the corresponding LONMARK eXternal Interface File
(XIF) shall be provided with the chiller submittal data.
11 All communication from the chiller unit controller as
specified in the points list shall be via standard BACnet
objects. Proprietary BACnet objects shall not be allowed.
BACnet communications shall conform to the BACnet
protocol (ANSI/ASHRAE135-2001). A BACnet
Protocol Implementation Conformance Statement
(PICS) shall be provided along with the unit submittal.
2.5. OPTIONAL ITEMS
A The following optional items shall be furnished:
1 [Open crate] OR [Open crate with bag] OR [totally
enclosed export crate] OR [totally enclosed export crate
with bag]
2 Pumpout unit, with or without storage vessel
3 Refrigerant monitor
4 IBC Certification: The chiller shall be certified to the
following codes and standards; 2009 IBC, 2010 CBC,
ICC-ES AC-156, ASCE 7-05. The chiller must be
mounted to a rigid base and may use r neoprene pads.
5 OSHPD Certification: The chiller shall be OSHPD Pre-
Approved per OSP-0116-10 and be so labeled. The