TRANSDUCER REPLACEMENT — Since the transducers are mounted on Schrader-type fittings, there is no need to re- move refrigerant from the vessel when replacing the transduc- ers. Disconnect the transducer wiring. Do not pull on the trans- ducer wires. Unscrew the transducer from the Schrader fitting. When installing a new transducer, do not use pipe sealer (which can plug the sensor). Put the plug connector back on the sensor and snap into place. Check for refrigerant leaks.

Be sure to use a back-up wrench on the Schrader fitting whenever removing a transducer, since the Schrader fitting may back out with the transducer, causing a large leak and possible injury to personnel.

Control Algorithms Checkout Procedure — One of the tables on the CVC/ICVC SERVICE menu is CON- TROL ALGORITHM STATUS. The maintenance screens may be viewed from the CONTROL ALGORITHM STATUS table to see how a particular control algorithm is operating.

These maintenance screens are very useful in helping to de- termine how the control temperature is calculated and guide vane positioned and for observing the reactions from load changes, control point overrides, hot gas bypass, surge preven- tion, etc. The tables are:

CAPACITY

Capacity

This table shows all values used

 

Control

to calculate the chilled water/brine

 

 

control point.

OVERRIDE

Override

Details of all chilled water control

 

Status

override values.

HEAT_EX

Surge/

The surge and hot gas bypass

 

HGBP

control algorithm status is viewed

 

Status

from this screen. All

 

 

values dealing with this control

 

 

are displayed.

LL_MAINT

LEAD/LAG

Indicates LEAD/LAG operation

 

Status

status.

OCCDEFCM

Time

The Local and CCN occupied

 

Schedules

schedules are displayed here to

 

Status

help the operator quickly deter-

 

 

mine whether the schedule is in

 

 

the “occupied” mode or not.

WSMDEFME

Water

The water system manager is a

 

System

CCN module that can turn on the

 

Manager

chiller and change the chilled

 

Status

water control point. This screen

 

 

indicates the

 

 

status of this system.

Control Test — The Control Test feature can check all the thermistor temperature sensors, pressure transducers, pumps and their associated flow devices, the guide vane actuator, and other control outputs such as hot gas bypass. The tests can help to determine whether a switch is defective or a pump relay is not operating, as well as other useful troubleshooting issues. During pumpdown operations, the pumps are energized to pre- vent freeze-up and the vessel pressures and temperatures are displayed. The Pumpdown/Lockout feature prevents compres- sor start-up when there is no refrigerant in the chiller or if the vessels are isolated. The Terminate Lockout feature ends the Pumpdown/Lockout after the pumpdown procedure is reversed and refrigerant is added.

LEGEND TO TABLES 11A-11J

CCM — Chiller Control Module

CVC — Chiller Visual Controller

CHW — Chilled Water

ICVC — InternationalControl Chiller Visual

ISM — Integrated Starter Module

PIC II — Product Integrated Controls II

VFD — Variable Frequency Drive

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Carrier XRV, 19XR specifications Heatex, Llmaint, Occdefcm
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19XR, XRV specifications

The Carrier 19XR and 19XRV chillers are sophisticated cooling solutions that represent the forefront of HVAC technology. Designed for large commercial and industrial applications, these chillers provide exceptional performance, energy efficiency, and reliability, making them ideal for a variety of environments ranging from hospitals to manufacturing facilities.

One of the most significant features of the Carrier 19XR and 19XRV chillers is their advanced scroll compressor technology. These units employ a tandem scroll design that enhances efficiency while minimizing operational noise. This makes them ideal for urban environments where noise restrictions may be in place. Moreover, the compressors are equipped with variable speed drive options in the 19XRV model, which allows for greater energy savings by adjusting cooling output based on real-time demand.

In addition to their advanced compressors, the 19XR and 19XRV units incorporate the Carrier GreenChoice refrigerant, which has a lower global warming potential compared to traditional refrigerants. This innovative choice not only meets regulatory requirements but also contributes to sustainability goals, making these chillers a responsible choice for environmentally conscious organizations.

The units are engineered with a robust heat exchanger design, which enhances heat transfer efficiency and overall system performance. This ensures optimal operation even in extreme conditions. They feature a microprocessor-based control system that allows for precise monitoring and control of the chiller’s performance, enabling operators to make real-time adjustments to maximize energy efficiency.

The Carrier 19XR and 19XRV chillers also prioritize serviceability. The design incorporates easy access to key components, simplifying maintenance procedures and reducing downtime. This focus on maintainability extends the lifespan of the equipment, leading to lower lifecycle costs.

In terms of connectivity, these chillers are equipped with advanced Building Management System (BMS) integration capabilities. This allows for seamless monitoring and control of the chillers using a centralized platform, facilitating energy management and operational optimization.

Overall, the Carrier 19XR and 19XRV chillers stand out in the market for their blend of cutting-edge technology, energy efficiency, and user-friendly features. They are engineered to meet the demanding needs of modern commercial and industrial applications, making them a preferred choice for facility managers seeking reliable cooling solutions.
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