Installation: Condair ML Princess 2/ML Princess 2 Max Adiabatic Humidification System User Manual

Overview

The ML Princess 2/ML Princess 2 Max Adiabatic Humidification System is a high-pressure humidification and evaporative cooling solution designed for commercial, industrial, and technical environments. It is intended for installation and servicing by qualified engineers and trained technical personnel.

Each humidification unit combines a stainless-steel nozzle ring with an integrated fan. Water delivered at high pressure is atomized into fine particles, and the fan distributes the resulting mist through the room. When the droplets evaporate into the surrounding air, they increase relative humidity and can provide evaporative cooling.

The system is part of a complete installation that may include one or more humidification units, a high-pressure pump, water treatment equipment, hoses, controls, and electrical protection. The ML Princess 2/ML Princess 2 Max Adiabatic Humidification System must be designed, installed, commissioned, and maintained in accordance with local regulations and the applicable pump documentation.

Specifications

• Models: ML Princess 2 and ML Princess 2 Max.
• Weight: 5.5 kg per unit.
• Nozzles: Eight stainless-steel nozzles per unit.
• Recommended nozzle size: 1.5–4.5 L/h for the ML Princess 2; 6.5 L/h for the ML Princess 2 Max.
• Total nozzle capacity: 10–36 L/h for the ML Princess 2; up to 52 L/h for the ML Princess 2 Max.
• Nozzle operating pressure: 35–70 bar.
• Housing: Anodized aluminum.
• Protective grille: Epoxy-treated steel.
• Water inlet: Ball valve with filter connection.
• Anti-drip protection: Standard on both models.
• Power supply: 200–240 VAC, 50/60 Hz, or 100–130 VAC, 50/60 Hz, depending on the model version.
• Ingress protection: IP44.
• Power consumption at nominal speed: 26 W for the ML Princess 2 and 49 W for the ML Princess 2 Max.
• Recommended relative-humidity range: 20–80% RH.
• Approximate noise level: 59.5 dB(A) at 1.5 m and 53 dB(A) at 3 m, measured vertically from the unit.
• Minimum spacing between modules: 8 m; use 10 m for ML Princess 2 Max modules.

Detailed Description

The main assembly consists of a fan housing, protective grille, baffle plate, nozzle ring, water inlet hardware, and electrical connection enclosure. The nozzle ring is secured above the baffle plate with dedicated brackets. The baffle plate must be positioned correctly, with its pointed end facing the fan blades, to support proper airflow and mist distribution.

The ML Princess 2 uses a regulated fan-speed system. Its standard fan setting is position 4. The ML Princess 2 Max is configured for fan position 7 and uses larger nozzles, allowing a higher water flow. A speed-regulating board provides additional control options and can reduce fan power consumption and operating noise at reduced speed.

A potentiometer may be connected where the installation requires adjustable humidification or fan performance. The fan has its own electrical circuit and must be wired according to the applicable connection diagram and local electrical requirements.

The standard package includes the humidifier unit, installation and operation documentation, an accessory kit, nozzle gasket, and a nozzle set. The nozzle ring is supplied with the ball valve, filter assembly, and nozzles. Optional parts include an air filter and filter holder for dusty operating environments.

Safety

Installation, commissioning, maintenance, repair, and decommissioning must be performed by appropriately qualified and trained technical personnel. The customer is responsible for ensuring that the installation complies with local building, electrical, water, lifting, and workplace-safety requirements.

• Disconnect and isolate electrical power and the water supply before maintenance or repair.
• The system operates with high-pressure water up to 70 bar. Never loosen a hose, fitting, or screw connection while the system is pressurized.
• Never remove or unscrew a nozzle from a pressurized unit.
• Before working on the high-pressure circuit, stop and isolate the pump or close the unit ball valve.
• Keep all labels, warning markings, and safety signs readable.
• Do not modify the system without manufacturer approval.
• Use only approved original accessories and replacement parts.
• Plan and risk-assess lifting operations, and allow only trained personnel to handle heavy components.

Shut down the system immediately and prevent accidental restart if components are damaged, heavily worn, excessively soiled, or leaking, or if a fan has stopped or is producing abnormal noise.

Hygiene and Water Quality

Water systems that are poorly installed or maintained can support microbial growth, including organisms associated with Legionnaires’ disease. The user is responsible for maintaining hygienic conditions and for following applicable local guidance, water regulations, and workplace procedures.

• Complete a water-system risk assessment with a competent person.
• Establish procedures for filter replacement, inspection, monitoring, and disinfection.
• Check water quality before commissioning and follow the requirements in the high-pressure pump documentation.
• Do not operate with water that is known to be polluted; shut down the system if contaminated drinking water is identified in the area.
• Avoid water temperatures between 25°C and 45°C, where Legionella growth is more likely.
• Avoid unnecessary shutdowns, closed nozzle sections, and stagnant water conditions.
• Disinfect the system at least annually and after maintenance or repair.
• Carry out complete system disinfection if the equipment has been shut down for more than 48 hours.
• Have water samples tested for harmful bacteria at least once a year.
• Continue follow-up testing and corrective action if bacterial contamination is detected.

Preventive disinfection may be performed through the high-pressure pump using a suitable approved disinfectant at the concentration specified by the pump and water-treatment procedures. Confirm chemical compatibility and follow the pump documentation before introducing any disinfectant.

Setup and Installation

Inspecting the Shipment

After delivery, remove the transport packaging and inspect the unit, accessories, and components for damage. Report visible transport damage through the appropriate supply channel before installation. If the system is not installed immediately, keep it in its original packaging whenever practical.

Storage

Protect stored components from physical impact, dust, frost, and rain. Keep the equipment covered and dry, and retain the transit packaging until installation whenever possible.

Installing the Nozzle Ring

1. Position the nozzle ring on top of the baffle plate.
2. Secure the ring using the nozzle-ring brackets.
3. Confirm that the filter fixture is secure and that its O-ring is correctly seated.
4. Install the ball valve and filter union in the correct orientation.
5. Keep the ball valve closed when the unit is finally mounted.
6. Do not install the bleeding nozzle on each individual unit until the system has been flushed.

Installing the Nozzles

1. Confirm that the nozzle threads and O-ring are undamaged and clean.
2. Start the nozzle by hand to avoid cross-threading.
3. Tighten it by hand, then use suitable polygrip pliers for approximately one-eighth of a turn.
4. Use a tightening torque of approximately 2.1 Nm, with a tolerance of ±0.1 Nm.
5. Check the nozzle tip and body to make sure the assembly is secure.

The nozzle seals with an O-ring and should not be overtightened. Excessive force can damage the nozzle threads.

Ceiling Mounting

The ML Princess 2 and ML Princess 2 Max may be suspended from a ceiling using suitable electro-galvanized knotted chain and appropriately rated S-hooks. The chain and hooks are not part of the standard delivery package.

• Use ceiling fixings suitable for the building structure and the expected load.
• Follow local building regulations when selecting screws, anchors, or concrete fixings.
• Adjust the chains so the unit is level.
• Attach the chains to the housing with the S-hooks.
• Keep the baffle plate oriented with its pointed end toward the fan blades.
• After flushing and bleeding, remove excess chain and close the S-hooks securely.

Water Connection

Connect the high-pressure hose to the unit’s ball valve. Secure the hose to the suspension chain with cable ties where appropriate, while avoiding damage or sharp bends.

• Size hoses according to the complete system design and applicable installation documentation.
• Avoid vertical U-shaped turns in the hose because they can trap air.
• Inspect every connection before pressurization.
• Keep the ball valve closed until the unit is fully installed and ready for controlled commissioning.

Installations may use series or parallel hose layouts. The arrangement must suit the system design, high-pressure pump, solenoid valves, drain arrangement, and hose dimensions.

Electrical Connection

An authorized electrician must connect the fan to the power supply. The fan is normally connected through a prescribed switch for continuous operation so that room air remains recirculated.

Depending on the version, the electrical circuit includes supply, neutral, protective ground, and 0–10 V control connections. Follow the wiring diagram supplied for the specific unit and installation. Do not energize the equipment until the protective earth, isolation means, fusing, and enclosure connections have been checked.

US and Canadian versions use a dedicated connection box on the baffle plate. These versions are configured for approximately 115 VAC at 60 Hz and use the supplied cable and appropriate fuse or circuit-breaker arrangement. Replacement fusing must match the specified ceramic fuse type and rating for the installed version.

Operation

During operation, the high-pressure pump supplies water to the nozzle ring. The nozzles atomize the water, while the integrated fan carries the fine droplets into the room. Correct evaporation depends on airflow, room conditions, nozzle selection, water pressure, and the surrounding air’s ability to absorb moisture.

Fan speed may be regulated through the installed control arrangement. The standard configuration is position 4 for the ML Princess 2 and position 7 for the ML Princess 2 Max. Any adjustment should be made as part of the commissioned control strategy and should not bypass safety interlocks or operating limits.

Do not close individual nozzles or sections unless necessary to address a fault or leak. Unused, water-filled sections can create stagnant conditions and increase hygiene risk.

Cleaning and Maintenance

Routine Checks

• Inspect hoses, fittings, valves, and nozzle connections for leaks.
• Check the fan for unusual noise, stoppage, vibration, or visible contamination.
• Verify that the protective grille and housing remain secure and unobstructed.
• Inspect the filter assembly and replace or clean it according to the installation environment and maintenance plan.
• Monitor water quality and maintain records of inspections, testing, and disinfection.

Optional Fan Air Filter

The optional air filter protects the fan motor in dusty environments such as woodworking or manufacturing areas. Heavy dust loads can require more frequent inspection and cleaning.

1. View the unit from below and identify the wire guard beneath the fan.
2. Install the filter while the fan is operating, following the approved installation procedure.
3. Fit the filter holder to secure the filter in position.

Isolate the equipment before removing the filter for cleaning or replacement unless the specific maintenance procedure explicitly requires otherwise and appropriate safeguards are in place.

Flushing and Disinfection

Flush the water circuit before installing the bleeding nozzle on each unit. Disinfect the complete system after maintenance or repair and whenever the system has been inactive for more than 48 hours. Use only a treatment method and chemical that are compatible with the pump, hoses, seals, nozzles, and local water regulations.

Troubleshooting

• No mist or insufficient humidification: Confirm that the pump is operating, the ball valve is open, the water supply is available, and the system has reached its intended pressure. Check for blocked nozzles, closed valves, incorrect nozzle selection, or air trapped in hose loops.
• Water leakage: Stop the pump, isolate electrical and water supplies, and depressurize the system before inspecting hoses, unions, O-rings, the ball valve, and nozzle fittings. Do not tighten or disconnect pressurized connections.
• Uneven humidity distribution: Check fan operation, fan-speed control, nozzle orientation, module spacing, and room airflow. Confirm that the baffle plate is correctly oriented and that the fan grille is not obstructed.
• Fan does not run: Verify the local isolator, protective device, supply voltage, fuse, control signal, and wiring. Electrical diagnosis must be performed by an authorized electrician.
• Fan is noisy: Inspect for dirt on the filter, grille, or fan, loose mounting hardware, damaged components, or abnormal bearing noise. Shut down the system if the noise is severe or the fan has stopped.
• Persistent hygiene concern: Stop the system when contamination is suspected, test the water, complete corrective disinfection, and continue follow-up measurements until acceptable conditions are restored.

Warranty

System parts are covered by a two-year warranty from the invoice date, except for replacement parts identified as routine-maintenance items. The warranty can be invalidated when installation, operation, or maintenance instructions are not followed.

Storage and Disposal

Protect the equipment from dust, moisture, frost, rain, and physical damage during storage. At the end of its service life, dispose of the ML Princess 2 or ML Princess 2 Max and its components according to applicable local laws and environmental regulations.

Pros & Cons

• Pros: Eight-nozzle atomization, integrated fan distribution, regulated fan speed, anti-drip valves, anodized aluminum housing, and suitability for both humidification and evaporative cooling.
• Pros: The ML Princess 2 Max provides higher nozzle capacity through larger nozzles and a higher standard fan setting.
• Cons: Installation requires qualified technical personnel, high-pressure water expertise, suitable electrical protection, and a planned hygiene program.
• Cons: Dusty environments may require frequent fan-filter maintenance, while poor hose routing can introduce air pockets and reduce reliable operation.