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RLC-PRC006-EN52
Generic Building Automation
System Controls
Controls
Easy Interface to A Generic Building
Management System
Controlling the air-cooled Series R chiller
with building management systems is
state-of-the-art, yet simple with either the
LonTalk Communications Interface for
Chillers (LCI-C) or Generic Building
Management System Hardwire Points.
Simple Interface with Other Control
Systems
Microcomputer controls afford simple
interface with other control systems,
such as time clocks, building automation
systems, and ice storage systems. This
means you have the flexibility to meet
job requirements while not having to
learn a complicated control system. This
setup has the same standard features as
a stand-alone water chiller, with the
possibility of having additional optional
features.
What are LonTalk, Echelon, and
LonMark?
LonTalk is a communications protocol
developed by the Echelon Corporation.
The LonMark association develops
control profiles using the LonTalk
communication protocol. LonTalk is a
unit level communications protocol,
unlike BACNet used at the system level.
LonTalk Communications
Interface for Chillers (LCI-C)
LonTalk Communications Interface for
Chillers (LCI-C) provides a generic
automation system with the LonMark
chiller profile inputs/outputs. The inputs/
outputs include both mandatory and
optional network variables. Note:
LonMark network variable names are in
parentheses when different from chiller
naming convention.
Chiller Inputs:
• Chiller Enable/Disable
• Chilled Liquid Setpoint (Cool Setpoint)
• Current Limit Setpoint (Capacity Limit
Input)
• Ice Making (Chiller Mode)
Chiller Enable/Disable
Allows for chiller to be started or
stopped depending on if certain
operating conditions are met.
Chilled Liquid Setpoint
Allows for the external setting
independent of the front panel setpoint
to adjust the leaving water temperature
setpoint.
PC Workstation
System Level
Controller
MP581 Programmable
Controller
Air-cooled
Series R
™
Chiller
MP581
Programmable
Controller
Ice Tanks
Boiler
Current Limit Setpoints
Allows for the external setting
independent of the front panel setpoint
to limit the capacity level of the chiller.
Ice Making
Provides interface with ice making
control systems. Please refer to page 54
for more information.
Chiller Outputs:
• On/Off
• Active Setpoint
• Average Percent RLA (Actual Capacity
Level)
• Active Current Limit Setpoint (Capacity
Limit)
• Leaving Chilled Water Temperature
• Entering Chilled Water Temperature
• Alarm Descriptor
• Chiller Status
On/Off
Indicates the current state of the chiller
Active Setpoint
Indicates the current value of the leaving
water temperature setpoint
Average Percent RLA
Provides the current capacity level via
%RLA
Active Current Limit Setpoint
Provides the current capacity level
setpoint via %RLA
Leaving Chilled Water Temperature
Provides the current leaving water
temperature
Entering Chilled Water Temperature
Provides the current entering water
temperature
Alarm Descriptor
Provides alarm messages based on pre-
determined criteria
Chiller Status
Indicates the running modes and states
of the chiller, i.e. Running in alarm mode,
chiller enabled, chiller being locally
controlled, etc…
Generic Building Management
System Hardwire Points
GBAS may be achieved via hardware
input/output as well. The input/outputs
are as follows:
Chiller hardwire inputs include:
• Chiller enable/disable
• Circuit enable/disable
• External chilled water setpoint
• External current limit setpoint
• Ice making enable
External Chilled Water Setpoint
Allows the external setting independent
of the front panel setpoint by one of two
means:
a) 2-10 VDC input, or
b) 4-20 mA input
External Current Limit Setpoint
Allows the external setting independent
of the front panel setpoint by one of two
means:
c) 2-10 VDC input, or
b) 4-20 mA input
Chiller hardwire outputs include:
• Compressor running indication
• Alarm indication (Ckt1/Ckt 2)
• Maximum capacity
• Ice making status
Alarm Indication Contacts
The unit provides three single-pole/
double-throw contact closures to
indicate:
a) Compressor on/off status
b) Compressor running at maximum
capacity
c) Failure has occurred (Ckt 1/Ckt 2)
These contact closures may be used to
trigger jobsite supplied alarm lights or
alarm bells.
Ice Making Control
Provides interface with ice making
control systems.