QUANTECH
18
SECTION 2 - PRODUCT DESCRIPTION
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
BUILDING AUTOMATION SYSTEM
CAPABILITIES
The E-Link Gateway provides an economical and
versatile connection between Quantech equipment
and open/standard protocols. It efficiently man-
ages the communication protocols currently used by
Quantech equipment, exposing the data in a consistent,
organized, and defined fashion. The E-Link Gateway is
available as a field-installed option on QTC4. 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 on
Page 18) 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 cen-
ter comes online as soon as the main power switch on
the unit is switched on; immediately, the microcom-
puter 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 capac-
ity 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 com-
pressors 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
Quantech’ 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 CONTROL CENTER USER
INTERFACE
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