Floor Mounted Close Control Units

Close control units maintain temperature within a narrow band around the setpoint, typically around ±1°C, and tighter where the design allows. This gives precise floor mounted precision temperature control.

Unlike comfort ACs, close control units both add and remove moisture, holding relative humidity within a tight band, typically around ±5% RH. This gives reliable floor mounted precision humidity control.

Close control units are designed for loads that are mostly sensible, such as IT and electronic equipment. They remove heat without over-drying the air.

Industrial-grade components are designed to run continuously, all year round.

Scroll compressors provide reliable cooling, while inverter compressors vary capacity for better efficiency and tighter control.

A high-efficiency coil is designed for high sensible cooling.

EC fans offer efficient, variable speed airflow.

Filters protect equipment, products, and coils from dust.

Electrode, infrared, or other humidifier types maintain the required humidity levels.

Reheat elements maintain temperature during dehumidification.

An electronic expansion valve in DX units, or a modulating valve in chilled water units, controls cooling precisely.

Temperature and humidity sensors feed the controller, which manages operation, alarms, and logging.

Heat is rejected outdoors through an air cooled condenser or a glycol dry cooler.

An air cooled floor mounted precision AC connects to an outdoor condenser. It is the most common type for standalone rooms.

A water cooled floor mounted precision AC or glycol cooled floor mounted precision AC rejects heat to a water or glycol loop, allowing longer distances to outdoor equipment.

Chilled water units connect to a central chiller plant. They are efficient in buildings with chilled water systems.

Dual cooling units combine chilled water and DX cooling, with one acting as backup for the other.

A downflow floor mounted precision AC supplies air into a raised floor, which is the classic raised floor CRAC unit arrangement for underfloor air distribution. An upflow floor mounted precision AC supplies air upward into ducts or plenums. Displacement units supply air directly into the room at low velocity.

Floor mounted precision AC free cooling options use cool outdoor conditions to reduce compressor operation.

ASHRAE TC 9.9 guidelines recommend server inlet temperatures of 18°C to 27°C for most IT equipment, with humidity controlled within recommended dew point limits and relative humidity of up to about 60%.

Labs and test rooms often need tight, application-specific temperature and humidity tolerances for accurate results.

Pharma stability and storage areas are maintained at defined conditions, such as 25°C and 60% RH for long-term stability, with continuous monitoring and data logging for compliance.

Archives and museums need stable, moderate temperature and humidity to protect paper, artefacts, and artworks.

Telecom and UPS rooms need stable temperatures to protect equipment and extend battery life.

Actual requirements vary by application and regulations. Compress India designs every system to your specified conditions.

CRAC cooling load calculation, or close control load calculation, starts with equipment loads, room heat gains, and moisture loads for accurate floor mounted precision AC sizing.

Close control unit CFM and SHR are selected to match the room's sensible and latent loads.

The required tolerances determine unit type, controls, humidifier, and reheat selection.

N+1 CRAC redundancy, or duty-standby pairs, keep conditions stable if a unit fails.

Raised floor, ducted, or free discharge distribution is selected based on room layout. High static close control units support ducted designs.

Sealed rooms with vapour barriers are essential for stable humidity.

Heat rejection is selected based on site, distance, and existing infrastructure.

EC fan close control units and inverter floor mounted precision ACs with variable speed compressors match output to load, reducing energy use.

Free cooling reduces compressor operation when outdoor conditions allow.

Efficient humidifier technologies reduce the energy used for adding moisture.

Smart controls prevent wasteful fighting between cooling, dehumidification, and reheat, keeping the energy efficient floor mounted precision cooling system running optimally.

PID control holds conditions steady with minimal fluctuation.

Units rotate duty and switch automatically to standby if a fault occurs.

Alarms alert operators to out-of-range conditions, dirty filters, and leaks.

Floor mounted precision AC BMS integration and CRAC DCIM integration through SNMP, CRAC Modbus, or CRAC BACnet connect units to building and IT systems. CRAC remote monitoring sends instant alerts.

Controllers log temperature, humidity, and alarms, supporting audits in pharma, labs, and regulated industries.

Close control maintains consistent conditions 24/7.

Stable conditions protect IT systems, pharma products, lab results, and archives.

A high sensible floor mounted precision AC removes equipment heat efficiently.

Auto changeover and N+1 designs minimise downtime.

Floor units are easy to service without ladders or ceiling access.

Industrial-grade components deliver long, reliable service.

Floor units take up floor area inside or near the room.

Precision units cost more upfront but deliver far greater reliability and control.

Humidification and reheat consume energy, which is minimised with smart controls.

Precision units need trained technicians for maintenance and calibration.

Compress India designs, installs, and maintains close control units to manage these limitations effectively.

A floor mounted precision air conditioner for data centers, or a floor mounted close control unit for server rooms, provides reliable data center precision cooling and server room precision cooling.

A floor mounted precision AC for telecom rooms protects network equipment.

A floor mounted precision AC for UPS rooms protects UPS systems and extends battery life.

Labs and test chambers rely on close control for accurate results.

Pharma facilities use close control units to maintain regulated conditions.

Archives and museums use close control to protect valuable collections.

Electronics and precision manufacturing need stable conditions for quality.

Control rooms in plants and utilities need stable conditions for equipment.

MRI, CT, and other imaging equipment rooms need precise cooling. These are all mission critical cooling unit applications.

Vertiv, including the Liebert range, offers floor mounted precision cooling for data centers and critical spaces.

Schneider Electric's Uniflair range offers close control and precision cooling units.

STULZ is known for close control air conditioners for data centers and technical rooms.

Blue Star offers precision air conditioners for data centers, telecom, and IT spaces in India.

Mitsubishi Electric, through its Climaveneta range, offers close control units for mission-critical applications.

Other manufacturers also offer close control units. Compress India recommends the best-fit brand for your project.

Scheduled quarterly visits cover inspections, cleaning, testing, and performance checks.

Filters are replaced regularly to maintain airflow and cleanliness.

Humidifier cylinders are inspected and replaced as they wear out.

Compressor current, pressures, and refrigerant charge are checked.

Coils and condensers are cleaned to maintain performance.

Sensors are calibrated to maintain accurate control, which is critical for compliance.

Our team provides round-the-clock support for critical failures.

Causes: poor PID tuning, sensor drift, or undersized units.

Solution: Tune controls, calibrate sensors, and review capacity.

Causes: humidifier faults, room leaks, or control settings.

Solution: Service the humidifier, seal the room, and adjust settings.

Causes: worn cylinders, water quality issues, or drain blockages.

Solution: Replace cylinders, check water supply, and clean drains.

Causes: dirty condensers, refrigerant leaks, or fan failure.

Solution: Clean condensers, repair leaks, and check fans.

Causes: blocked drains, humidifier overflow, or pipe leaks.

Solution: Clean drains, repair leaks, and test leak detection.

Causes: sensor ageing or contamination.

Solution: Recalibrate or replace sensors regularly.

Causes: controller configuration or communication faults.

Solution: Check wiring, reconfigure controllers, and test changeover.

Replacing comfort ACs in critical rooms with close control units improves reliability and control.

EC fans and inverter compressors improve efficiency and control.

Free cooling options can be added to reduce energy use.

Upgraded controllers provide better control, data logging, and remote alerts.

Higher floor mounted precision AC capacity and CRAC cooling capacity mean higher cost. Inverter compressors, EC fans, humidifiers, reheat, and free cooling add to the price but improve performance.

DX units include compressors and condensers. Chilled water units rely on the chiller plant, which affects total project cost.

Piping, condensers, floor stands, drains, leak detection, and electrical work form part of the installed cost.

Brand, capacity, tolerances, number of units, redundancy, monitoring, and site conditions all affect the final price.

Share your room details and requirements with Compress India to receive an accurate quotation.