Carrier 23XRV manual

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displayed informing the operator that the chiller is operating in ramp loading mode.

l.Chilled Water Reset:

The control center shall allow reset of the chilled water temperature set point based on any one of the following criteria:

1)Chilled water reset based on an external 4 to 20 mA signal.

2)Chilled water reset based on a remote temperature sensor (such as outdoor air).

3)Chilled water reset based on water tem- perature rise across the evaporator.

m.Demand Limit:

The control center shall limit amp draw of the compressor to the rated load amps or to a lower value based on one of the following criteria:

1)Demand limit based on a user input ranging from 40% to 100% of compres- sor rated load amps

2)Demand limit based on external 4 to 20 mA signal.

n.Controlled Compressor Shutdown:

The controls shall be capable of being configured to soft stop the compressor. The display shall indicate “shutdown in progress.”

2.Safeties:

a.Unit shall automatically shut down when any of the following conditions occur (each of these protective limits shall require manual reset and cause an alarm message to be dis- played on the control panel screen, inform- ing the operator of the shutdown cause):

1)Motor overcurrent

2)Over voltage*

3)Under voltage*

4)Single cycle dropout*

5)Low oil sump temperature

6)Low evaporator refrigerant temperature

7)High condenser pressure

8)High motor temperature

9)High compressor discharge temperature

10)Low oil pressure

11)Prolonged stall

12)Loss of cooler water flow

13)Loss of condenser water flow

14)Variable frequency drive fault

15)High variable frequency drive temperature

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

b.The control system shall detect conditions that approach protective limits and take self- corrective action prior to an alarm occur- ring. The system shall automatically reduce chiller capacity when any of the following

parameters are outside their normal operat- ing range:

1)High condenser pressure

2)High motor temperature

3)Low evaporator refrigerant temperature

4)High motor amps

5)High VFD rectifier temperature

6)High VFD inverter temperature

c.During the capacity override period, a pre- alarm (alert) message shall be displayed informing the operator which condition is causing the capacity override. Once the con- dition is again within acceptable limits, the override condition shall be terminated and the chiller shall revert to normal chilled water control. If during either condition the protective limit is reached, the chiller shall shut down and a message shall be displayed informing the operator which condition caused the shutdown and alarm.

d.Internal built in safeties shall protect the chiller from loss of water flow. Differential pressure switches shall not be allowed to be the only form of freeze protection.

3.Diagnostics and Service:

a.A self diagnostic controls test shall be an integral part of the control system to allow quick identification of malfunctioning components.

b.Once the controls test has been initiated, all pressure and temperature sensors shall be checked to ensure they are within normal operating range. A pump test shall automat- ically energize the chilled water pump, con- denser water pump, and oil pump. The control system shall confirm that water flow and oil pressure have been established and require operator confirmation before pro- ceeding to the next test.

c.In addition to the automated controls test, the controls shall provide a manual test which permits selection and testing of indi- vidual control components and inputs. A thermistor test and transducer test shall dis- play on the ICVC screen the actual reading of each transducer and each thermistor installed on the chiller. All out-of-range sen- sors shall be identified. Pressure transducers shall be serviceable without the need for refrigerant charge removal or isolation.

4.Multiple Chiller Control:

The chiller controls shall be supplied as stan- dard with a two-chiller lead/lag and a third chiller standby system. The control system shall automatically start and stop a lag or second chiller on a two-chiller system. If one of the two chillers on line goes into a fault mode, the third standby chiller shall be automatically started. The two-chiller lead/lag system shall allow

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Contents 23XRV Features/BenefitsProduct reliability Table of contents Microprocessor controls features Heat exchanger featuresA23-1648 Model number nomenclatureComponent Weights 23XRV Compressor and Motor Weights23XRV Heat Exchanger Weights Physical dataNumber Additional Weights for 23XRV Marine WaterboxesFrame PassesOption ACCESSORY† → Options and accessories23XRV Dimensions Dimensions23XRV Dimensions NOZZLE-IN-HEAD Waterbox 23XRV Dimensions Marine WaterboxNozzle Size Performance data23XRV Heat Exchanger MIN/MAX Flow Rates Cooler PassAuxiliary Ratings Electrical dataVFD Frame Sizes Controls FeaturesMicroprocessor controls Control systemControl Panel Display Front View CCM CCN Communication Wiring for Multiple Chillers TypicalControl Sequence Control sequence23XRV Chiller Typical piping and wiringGND Ground Control wiring schematic23XRV Component Arrangement Application data Dimensions mm→ 23XRV Machine Footprint 23XRVA23-1647 23XRV Isolation with Accessory Soleplate PackageCooler Waterboxes 23XRV Nozzle ArrangementsCondenser Waterboxes Out23XRV Nozzle Arrangements Relief Valve Arrangements Relief Valve LocationsRelief valve discharge pipe sizing Vent and drain connectionsAsme stamping Design pressures23XRV Minimum FIELD-INSTALLED Insulation Requirements → Minimum fluid loop volumeInsulation Condensation VS Relative HumidityHvac Guide Specifications Guide specificationsWarranty Guide specifications Page Guide specifications Page Guide specifications Page Carrier Corporation Syracuse, New York 910

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.
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