Specifications
2
■ Compressor■with■variable-frequency■drive■(VFD)
19XRV chillers are equipped with a compressor variable-
frequency system. By changing the compressor operating
mode this system considerably reduces power consumption
based on the motor rotational speed.
In addition, the variable-frequency drive control box is
cooled by refrigerant minimising its size and ensuring
optimal component cooling for an extended operating life.
This concept makes water cooling unnecessary and elimi-
nates the associated maintenance cost and water pump
power consumption.
■■ Aerodynamically-contoured■impellers
Impellers that utilize high back sweep main blades with
low-profile intermediate splitter blades are aerodynami-
cally contoured to improve compressor full-load and
part-load operating efficiency.
■■ Modular■construction
The cooler, condenser, and compressor assemblies are
completely bolted together, making the 19XR/19XRV
chillers ideally suited for replacement projects where ease
of disassembly and reassembly at the jobsite are essential.
■■ Water■piping
The unit has quick and easy piping: the standard unit
includes nozzle-in head water boxes with Victaulic grooves
to allow for use of Victaulic couplings. Flanges are available
as an option.
■■ Optional■unit-mounted■electronic■starter
Carrier’s unit-mounted electronic starter is only available
as a low-voltage version and provides a single point power
connection, reducing machine installation time and expense.
■■ Quick■start-up
The 19XR/XRV unit manufacturing site uses a quality
management process that is certified to ISO 9001. All units
undergo factory checks to ensure easy and reliable start-up.
Compressors are run-tested to ensure proper operation of
all compressor systems, including oil management, vibration,
electrical, power transmission, and compression.
1■-■Control■boxes
■ Serviceability and convenience have been “designed-in”,
for example:
- Control transformer is fitted as standard
- Single-point mains power connection if unit-mounted
starter is supplied
- All components are mounted using connectors to facilitate
fast servicing and replacement
- Components are labelled and numbered according to
wiring diagrams
- IP 23C protection on the whole unit
2■-■Controls■system
■■ Numerical■product-integrated■control■(PIC)
The Carrier numerical product-integrated PIC control
provides unmatched flexibility and functionality. Each unit
integrates directly with an installation control system (using
several communication protocols) that offers a global
system solution.
■■ Human■interface■(ICVC)
The ICVC (Interface Chiller Visual Control), that can be
configured to display units in Imperial or metric, provides
unparalleled ease of operation. A 16-line by 40-character
LCD (Liquid Crystal Display) features four menu-specific
soft keys. Default display offers easy, quick display of key
chiller operation data, simplifying the interaction between
machine and user.
Local languages are available upon request.
■■ Chilled-water■reset
Reset can be accomplished manually or automatically from
the building management system. Reset saves energy when
warmer chilled water can be utilized.
■■ Demand■limiting
This function limits the power draw of the chiller during
peak loading conditions. When incorporated into the
Carrier Comfort Network building automation system, a
red line command will hold chillers at their present capacity
and prevent any other chillers from starting. If a load shed
signal is received, the compressors are unloaded to avoid
high demand charges whenever possible.
■■ Ramp■loading
Ramp loading ensures a smooth pulldown of water loop
temperature and prevents a rapid increase in compressor
power consumption during the pulldown period.
■■ Automated■controls■test
The test can be easily executed prior to start-up to verify
that the entire control system is functioning properly.
■■ 365-day■real■time■clock
This feature allows for the operator to programme a
yearly schedule for each week, weekends, and holidays.
■■ Occupancy■schedules
Schedules can be programmed into the controller to ensure
that the chiller only operates when cooling is required.
■■ Extensive■service■menu
Unauthorized access to the service menu can be password-
protected. Built-in diagnostic capabilities assist in trouble-
shooting and recommend proper corrective action for
preset alarms, resulting in less down time.
■■ Battery■backup
Battery backup provides protection during power failures
and eliminates time consuming control reconfiguration.
Encapsulated circuit boards are designed, built and tested
in-house. Each board meets Carrier’s stringent quality
standards for superior reliability compared to open board
designs.
■■ Other■control■features■include:
Display of over 125 operating, status, and diagnostic
messages for improved user interface.
Examples:
- Monitoring of over 100 functions and conditions to
protect the chiller from abnormal conditions.
- Modular plug-in design, reducing wiring requirements
and providing easy installation.
- Low-voltage (24 V ac) design, providing the ultimate
assurance of personal safety and control integrity.
■■ Microprocessor-controlled■oil■heater
The heater prevents excessive absorption of refrigerant into
the oil during compressor shutdown, ensuring a plentiful
supply of undiluted lubrication oil in the oil sump.
■■ Safeties
Unit is automatically shut down when any of the following
conditions occur:
- Motor overcurrent
- Over voltage*
- Under voltage*
- Single cycle dropout*
- Bearing oil high temperature
- Low evaporator refrigerant temperature
- High condenser pressure
- High motor temperature
- High compressor discharge temperature
- Low oil pressure
- Prolonged surge
- Loss of cooler water flow
- Loss of condenser water flow
- Starter fault
Each of these protective limits shall require manual reset
and cause an alarm message to be displayed on the LCD
screen, informing the operator of the shutdown cause.