Building Automation System Capabilities; Microcomputer Control Center; Display Data; Programmable Setpoints - York YVAA Installation, Operation & Maintenance Instructions Manual

SECTION 2 - PRODUCT DESCRIPTION
BUILDING AUTOMATION SYSTEM
CAPABILITIES
The E-Link Gateway provides an economical and ver-
satile connection between York equipment and open/
standard protocols. It efficiently manages the commu-
nication protocols currently used by York equipment,
exposing the data in a consistent, organized, and de-
fined fashion. The E-Link Gateway is available as a
field-installed option on YVAA. A simple switch se-
lection 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 on
Page 20) provides automatic control of chiller
operation including compressor start/ stop and load/
unload anti-recycle timers, condenser fans, evapora-
tor 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 continu-
ous monitoring.
The microprocessor controls the unit's capacity by
matching the actual leaving chilled water tempera-
ture (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.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
20
• 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 sys-
tem is running through a Building Automation System.
FIGURE 3 - VIEW OF YORK CONTROL CENTER
USER INTERFACE
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
JOHNSON CONTROLS