Controls

Microprocessor controls

Microprocessor controls provide the safety, interlock, ca- pacity control, indications and accessibility necessary to operate the chiller in a safe and efficient manner.

Control system

The microprocessor control on each Carrier chiller is factory-mounted, factory-wired, and factory-tested to ensure machine protection and efficient capacity control. In addition, the program logic ensures proper starting, stopping, and recycling of the chiller and provides a com- munication link to the Carrier Comfort Network® (CCN) system.

Features

Control system

Component test and diagnostic check

Programmable recycle allows chiller to recycle at opti- mum loads for decreased operating costs

Menu-driven keypad interface for status display, set point control, and system configuration

CCN system compatible

Primary and secondary status messages

Individual start/stop schedules for local and CCN opera- tion modes

Recall of up to 25 alarm messages and 25 alert mes- sages with diagnostic help

Two chiller lead/lag with third chiller standby is stan- dard in the PIC III software

Optional soft stop unloading decreases compressor speed to unload the motor to the configured amperage level prior to stopping

Languages pre-programmed at factory for English, Chi- nese, Japanese, Korean

ILT (International Language Translator) available for conversion of extended ASCII characters

Safety cutouts

Motor high temperature*†

Refrigerant (condenser) high pressure*†

Refrigerant (cooler) low temperature*†

Lube oil low pressure*

Compressor (refrigerant) high discharge temperature*

Under voltage**

Over voltage**

Cooler and condenser liquid flow

Motor overload†

Motor acceleration time

Intermittent power loss**

Motor stall protection

Low level ground fault

Cooler and condenser freeze prevention*

Low oil temperature

Line voltage imbalance**

Line current imbalance**

Line frequency

Motor current imbalance

Motor rotation reversal

Excessive motor amps

Motor starts limit

VFD speed out of range

High VFD rectifier temperature*†

High VFD inverter temperature*†

DC bus voltage (Low/High)

Capacity control

Leaving chilled liquid control

Entering chilled liquid control

Soft loading control by temperature or load ramping

Hot gas bypass valve (optional)

Power (demand) limiter

Automatic chilled liquid reset (3 methods)

Manual speed control

Interlocks

Manual/automatic remote start

Starting/stopping sequence

Pre-lube/post-lube Pre-flow/post-flow

Compressor run interlock

Pre-start check of safeties and alerts

Low chilled liquid (load) recycle

Monitor/number compressor starts and run hours

Manual reset of safeties

Indications

Chiller operating status message

Power-on

Pre-start diagnostic check

Compressor motor amps

Alert (pre-alarm)††

Alarm

Contact for remote alarm

Safety shutdown messages

Elapsed time (hours of operation)

Chiller input kW

Demand kW

Drive control parameters

Compressor 100% speed (Hz)

Rated line voltage

Rated line amps

Rated line kW

Motor rated Load kW

Motor rated Load amps

Motor nameplate amps

Motor nameplate RPM

Motor nameplate kW

Inverter PWM frequency

*Can be configured by the user to provide alert indication at user-defined limit.

†Override protection: Causes compressor to first unload and then, if necessary, shut down.

**Will not require manual reset or cause an alarm if auto- restart after power failure is enabled.

††By display code only.

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Carrier 23XRV manual Controls, Microprocessor controls, Control system, Features

23XRV specifications

The Carrier 23XRV is a high-performance commercial rooftop unit designed for versatility and efficiency in various applications. As part of Carrier's commitment to providing superior HVAC solutions, the 23XRV combines advanced technologies with robust construction to meet the demands of modern commercial environments.

One of the standout features of the 23XRV is its superior energy efficiency. The unit is equipped with a variable speed compressor that adjusts the cooling output based on real-time demand. This allows for optimal efficiency even during partial load conditions, significantly reducing energy consumption and operational costs. It boasts a high SEER (Seasonal Energy Efficiency Ratio) and EER (Energy Efficiency Ratio) ratings, making it an environmentally friendly option that helps to lower carbon footprints.

The 23XRV is constructed with a strong focus on durability. Its robust frame and high-quality materials ensure resilience against harsh weather conditions and extend the unit's service life. The design also incorporates sound-attenuating features, minimizing operational noise and making it suitable for noise-sensitive environments like schools and hospitals.

In terms of technology, the Carrier 23XRV utilizes advanced microprocessor controls that enable precise temperature management and system diagnostics. This smart control system provides enhanced functionality, allowing for easy monitoring and configuration through a user-friendly interface. Additionally, the unit is compatible with remote monitoring systems, enabling building managers to track performance and make adjustments as necessary from any location.

The refrigerant used in the 23XRV is R-410A, which is chlorine-free and meets stringent environmental regulations. The choice of refrigerant not only enhances the efficiency of the system but also aligns with global efforts to phase out ozone-depleting substances.

Maintenance and serviceability are also key considerations in the design of the 23XRV. Features such as easy access to components for routine maintenance, modular construction for quicker repairs, and extensive diagnostic capabilities reduce downtime and enhance overall reliability.

Overall, the Carrier 23XRV stands out in the commercial HVAC market with its combination of efficiency, durability, and advanced technology. It is an excellent choice for various commercial applications, providing reliable performance and improved energy management for building owners and operators looking to enhance their HVAC systems.