Carrier 30RH, 30RA manual Refrigerant charge and electronic control, Electronic control

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30RA/30RH

Refrigerant charge and electronic control

Undercharge

If there is not enough refrigerant in the system, this is indicated by gas bubbles in the moisture sight glass.

There are two possibilities:

•Small undercharge (bubbles in the sight glass, no significant change in suction pressure).

-After detection and repair the unit can be recharged.

-The replenishment of the charge must always be done in the cooling mode, slowly introducing liquid refrigerant at the suction side, until there are no bubbles in the sight glass.

•Significant undercharge (large bubbles in the sight glass, significant drop in suction pressure).

-Completely drain the refrigerant charge, using a refrigerant recovery unit. After detection and repair check the charge with the unit off, drain the system and recharge the full amount of liquid refrigerant (see Table I) on the suction and discharge side.

-The refrigerant container used must contain a minimum of 10% of its initial charge.

WARNING:

If brazing is to be done, the refrigerant circuit must be filled with nitrogen.

Combustion of refrigerant produces toxic phosgene gas.

IMPORTANT:

-Never use the compressor as a vacuum pump.

-Always add refrigerant via the suction line.

-Refrigerant must be added very slowly.

-The complete refrigerant charge must never be filled into the suction line.

-Do not overcharge the system with refrigerant.

Electronic control

Operation and control of all units is carried out via the electronic control.

The instructions supplied with the control include comprehensive descriptions.

PRO-Dialog Plus electronic control

PRO-DIALOG Plus is an advanced numeric control system that combines complex intelligence with great operating simplicity. PRO-DIALOG Plus constantly monitors all machine parameters and safety devices, and precisely manages the operation of compressor and fans for optimum energy efficiency.

It also controls the operation of the water pump.

A powerful control system

The PID control algorithm with permanent compensation for the difference between entering and leaving water temperature and anticipation of load variations regulates compressor operation for intelligent leaving water temperature control.

To optimise power absorption, the PRO-DIALOG PLUS automatically re-calibrates the set point of the entering water temperature based on the outside air temperature to one of the two pre-set values (occupied building and of an unoccupied building for example).

PRO-DIALOG Plus control is auto-adaptive for full compressor protection. The system permanently optimises compressor run times according to the application characteristics (water loop inertia), preventing excessive cycling. In most comfort air conditioning applications this feature makes a buffer tank unnecessary.

Clear and easy-to-use control system

The operator interface is clear and user-friendly: LEDs and two numeric displays ensure immediate verification of all unit operating data.

10 menus offer direct access to all machine controls, including a history of possible faults, for rapid and complete chiller fault diagnosis.

Extended communications capabilities

PRO-DIALOG Plus allows remote control and monitoring of the unit through a wired connection: start/stop, cooling/heating mode selection (only 30RH unit), power demand limit or dual set-point and customer safety lock.

The system permits remote signalling of any general anomaly for each refrigerant circuit.

Three independent time schedules permit definition of: chiller start/stop, operation at the second set-point (e.g. unoccupied mode), and operation at low fan speed (e.g. during the night). This option also permits cascade operation of two units and remote control via communication bus (RS 485 serial port).

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Contents Aquasnap 30RA / 30RH 30RA/30RH ContentsTable II Electrical data Model RA Physical data and electrical data Model RATable I Physical data Model RA Table II Electrical data Model RH Physical data and electrical data Model RHTable I Physical data Model RH Mod RA 026 Dimensions and location of hydraulic connections mmHydronic module Unit installationGeneral information and hydronic module Water connections Typical water circuit diagram for units with hydronic moduleGlycol Ethylene glycol curvePump leakproof For use with propyleneWater pressure drop of the unit without hydronic module Example Electrical connections and refrigerant chargeElectrical connections Liquid refrigerant chargeElectronic control Refrigerant charge and electronic controlStart-up Compressor replacementPump replacement Necessary checks/precautions before start-upOperating range 30RA units Table III Pressure switch settings30RA Operating limits 30RH Operating limitsFinal recommendations General maintenanceMaintenance Troubleshooting Via R. Sanzio, 9 20058 Villasanta MI Italy Tel /3636.1 L010126H27

30RH, 30RA specifications

Carrier has long been a leader in the heating, ventilation, and air conditioning (HVAC) industry, and the Carrier 30RH and 30RA series showcases this legacy through a combination of advanced technology, energy efficiency, and reliability. These models are designed to meet the diverse needs of both commercial and industrial facilities, providing optimal comfort and air quality.

One of the standout features of the Carrier 30RH and 30RA series is their versatility. These models are equipped with high-efficiency scroll compressors that offer exceptional performance while keeping energy consumption low. This not only translates to reduced operational costs but also helps in meeting stringent environmental regulations. The compressors work efficiently across a range of operating conditions, making these units suitable for various climates and applications.

Incorporating innovative technologies, the Carrier 30RH and 30RA series utilizes advanced controls to optimize performance. The carrier’s proprietary control system allows for seamless integration with building management systems, enabling remote monitoring and management. This connectivity ensures that operators can track energy usage and system performance in real-time, facilitating maintenance and problem-solving before issues escalate.

Both models include high-efficiency heat exchangers that enhance the heat transfer process, further promoting energy savings. The units are also designed to minimize sound levels, making them ideal for installation in noise-sensitive environments. With noise reduction features, the Carrier 30RH and 30RA units operate quietly, ensuring comfort in spaces where silence is paramount.

Durability is another core characteristic of these models. Built with robust materials and innovative engineering, the 30RH and 30RA series is designed to withstand the rigors of demanding commercial and industrial applications. Their reliable performance over time is backed by rigorous testing, ensuring longevity and reducing the likelihood of unexpected failures.

Environmental sustainability is a priority for Carrier, and the 30RH and 30RA series reflect this commitment. By utilizing environmentally friendly refrigerants and energy-efficient technologies, these units significantly reduce greenhouse gas emissions.

In summary, the Carrier 30RH and 30RA series are exemplary models that combine efficiency, advanced technology, and reliability. Their design focuses on optimizing comfort, reducing energy consumption, and ensuring longevity, making them an excellent choice for any commercial or industrial installation. Whether it’s in a bustling city center or a quiet suburban area, these units are engineered to deliver exceptional performance and value throughout their lifecycle.
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