Specifications

16
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
PRODUCT DESCRIPTION
BUILDING AUTOMATION SYSTEM
CAPABILITIES
The E-Link Gateway provides an economical and
versatile connection between York equipment and
open/standard protocols. It efficiently manages the
communication protocols currently used by York
equipment, exposing the data in a consistent, organized,
and defined fashion. The E-Link Gateway is available
as a field-installed option on YVAA. A simple switch
selection allows configuration of the required equipment
profile and output protocol, which reduces equipment
connectivity startup time.
MICROCOMPUTER CONTROL CENTER
The microcomputer control center (see Figure 3)
provides automatic control of chiller operation including
compressor start/ stop and load/unload anti-recycle
timers, condenser fans, evaporator pump, evaporator
heater, unit alarm contacts and run signal contacts. The
microcomputer control center comes online as soon
as the main power switch on the unit is switched on;
immediately, the microcomputer control center will
begin to check all variables with a frequency ranging
from 30 seconds to almost continuous monitoring.
The microprocessor controls the unit’s capacity by
matching the actual leaving chilled water temperature
(LCWT) to the user-defined setpoint. Factors that may
cause the system’s actual LCWT to fluctuate are changes
in ambient temperature, loop flow rate, load, and loop
volume. The control system reacts to such changes by
adjusting the number of compressors that are on and the
loading of each compressor in order to keep the LCWT
at the setpoint.
The control system logic monitors the rate at which the
LCWT is approaching the setpoint to ramp up or down
compressor capacity as required. The variable frequency
drive allows the compressor capacity to match the load.
Display Data
• Leaving Chilled Liquid Temperature
• Returning Liquid Temperature
• Ambient Temperature
• Lead System
• Compressor Capacity (% of Full Load Amps)
• VSD Output Frequency / Compressor Speed
• Compressor Run Hours
• Compressor Number of Starts
• Oil Pressure and Temperature (per Compressor)
• Evaporator Pump Status
• Evaporator Heater Status
• History Data for Last Twenty Normal Shutdowns
• History Data for Last Ten Shutdown Faults
Programmable Setpoints
• Chiller On/Off
• Chilled Liquid (Water or Glycol)
• Local or Remote Control
• Units of Measure (Imperial or SI)
• System Lead / Lag
• Remote Temperature Reset
• Remote Current Limit
• Leaving Chilled Liquid Temperature Setpoint and
Range
Johnson Controls’ systems or another vendor’s systems
can incorporate these setpoints and data outputs to give
the customer a complete understanding of how the system
is running through a Building Automation System.
FIGURE 3 - VIEW OF YORK CONTROL CENTER
USER INTERFACE