Nelson AD50 Commercial Dishwasher User Manual

1 Product Identification

1.1 Application, General Functions and Intended Use

This dishwasher is designed for professional use in the restaurant and institutional catering sector. It complies with relevant safety regulations. Misuse may cause injury or damage. The dishwasher must only be used by suitably trained staff. It is intended for washing tableware (dishes, pans, trays, cups, glasses, bowls) and other commercial catering items in non-mobile premises. Any other use is not permitted and may be dangerous. Persons with reduced physical, sensory, or mental capabilities, or lacking experience or knowledge, must use the appliance only under supervision. The manufacturer is not liable for injury or damage caused by non-compliance with instructions, misuse, tampering, or use of non-genuine spare parts.

1.2 Name and Address of Manufacturer or Distributor

Nelson Dish & Glasswashing Machines
Unit 1 Rowley Industrial Park
Roslin Road
Acton, LONDON W3 8BH
020 8993 6198
Website: www.nelsonwash.co.uk
International customers should contact their local Nelson distributor.

1.3 Declaration of Conformity to Product Standards

This appliance complies with relevant safety regulations and directives 2006/42/EC and 2004/108/EC. It is also marked in compliance with European Directive 2002/96/EC on Waste Electrical and Electronic Equipment (WEEE). For proper disposal, contact local authorities or your authorized reseller to safeguard the environment and health.

1.4 Description of the Appliance (According to the Model)

2 Symbols Used in the Manual

• Read manual instructions carefully ?
• Important safety information ⚠️
• Risk of electric shock ⚡
• Earth connection point ?
• Important information ❗
• Information for qualified personnel ?
• End-of-life disposal instructions ♻️

3 Safety Precautions and Instructions

Read these precautions and instructions carefully. The manufacturer is not responsible for damage caused by non-compliance.

3.1 Correct Installation

• Installation must be performed by an authorized technician.
• Wear appropriate Personal Protection Equipment (PPE) during handling and installation.
• Do not install a damaged appliance; consult your dealer if in doubt.
• Do not operate if the power supply cable is damaged.
• Do not install in freezing temperatures or explosion-risk atmospheres (ATEX).
• Only use manufacturer-authorized accessories.
• Avoid installation next to heat-radiating appliances (e.g., gas burners).
• If installed above ground, ensure the stand and appliance are secured.
• Electrical safety requires connection to an earth conductor compliant with regulations. Consult a qualified electrician if unsure.
• A circuit breaker and overcurrent protection device must be installed and accessible, serving only this appliance.
• Do not use adapters or extensions for electrical connection.
• If using a plug, it must match the socket type, be suitable for the appliance's rating, and accessible after installation.
• Use only new hoses for water supply connection.
• Drain connections must comply with national regulations to prevent flowback or pollution.
• If not installed in a recess, use a special mounting kit for stability.

3.2 Safe Use

• Staff must be suitably trained and instructed.
• Not suitable for juveniles or persons with reduced capabilities without supervision.
• Do not leave the door open; risk of tripping or injury.
• Do not sit or lean on the open door.
• Water inside the dishwasher is not drinkable.
• Do not use for washing or soaking foods.
• Do not use water for defrosting foods.
• Dishes are very hot at the end of a wash cycle.
• Take care when opening the door to avoid splashes of hot water.
• Place knives and pointed kitchen equipment with tips downwards or horizontally, ensuring they do not protrude from the basket.
• Use only detergents and rinse aids suitable for professional dishwashers. Other products may cause damage.
• Do not operate with organic solvents or flammable liquids. Never load dishes dirty with ash, wax, or paint.
• Comply strictly with detergent producer instructions and keep safety datasheets accessible.
• Swallowing or inhaling detergents can cause serious injury; seek immediate medical advice if this occurs.
• Use intact baskets; do not remove, damage, or tamper with plastic runners.

3.3 Correct Maintenance

• Do not clean with water jets, high-pressure, or steam cleaners.
• Disconnect from mains electricity before any maintenance.
• Never open the dishwasher's case; risk of electric shock. Only authorized technicians may access internal parts.
• Repairs must be carried out by authorized service organizations only.
• No alterations or changes to electrical circuits or mechanical structure are permitted.
• Replace faulty parts only with genuine spare parts.
• The power supply cable, if fitted, must be replaced by the manufacturer or an authorized service center.

4 Product Characteristics

4.1 Overall Dimensions (for built-under installation)

4.2 Overall Dimensions (raised models)

4.3 Technical Characteristics

5 Preparing the Appliance for Use

Convey the dishwasher to the installation site, remove packaging, and check for damage. Keep packaging materials away from children. All packaging materials are environment-friendly and suitable for recycling or disposal according to local regulations.

All operations in this section must be carried out and/or checked by qualified staff.

5.1 Positioning and Installation

Place the dishwasher in the chosen location and remove protective film. Level the appliance on its four feet. Ensure it is stable. If installed above ground, secure it properly. The installation premises must comply with relevant regulations. Check recommendations for adjacent appliances. Use only professional furnishings. Other types may be damaged.

5.2 Connection to the Water Supply

Verify intake water pressure, flow rate, and temperature match technical specifications. Install a pressure reducer if dynamic pressure exceeds limits. A pump may be needed if pressure is too low. Connect the intake hose to a 3/4" gas threaded fitting, inserting the provided filter "A". The tap must be easily accessible. Use only new hoses. Flush pipes if the system has been unused or worked on. For models with a water softener, fit an approved double check valve. For models without, fit an approved single check valve.

5.3 Drain Connection

The dishwasher has a drain pump. Check diameter and height of wall drain connections against technical specifications. Avoid kinks, sharp bends, or crushing of the drain hose. Use hose clamps to fix the hose end to the drain connection due to high water temperature. Drain connections must comply with national regulations. Do not add extensions to the drain hose.

5.4 Connection to the Electricity Supply

Connection must be made by authorized, skilled staff according to regulations. Check the appliance's technical data plate. Install an accessible circuit breaker and overcurrent protection device suitable for the appliance's rating. Perform a functional test before operation. If using a plug, it must match the socket, be suitable for the appliance's rating, and accessible. Ensure connection to an earth conductor. Do not use adapters or extensions. Connect to the equipotential bonding system. An additional recommendation is a class B all-current sensitive residual-current circuit breaker (30 mA tripping current). The appliance is powered unless the master switch is off or the plug is disconnected.

Electrical connections indicated on the data plate (examples):

• NCHF-400V 3N~/12A/7,3kW/50Hz
• NCHF-230V 3~/21A/7,3kW/50Hz
• CHF-230V 3~/22A/7,3kW/50Hz
• CHF-230V 3~/15A/5,0kW/50Hz
• NCHF-230V 3~/20A/4,5kW/50Hz

CHF models: tank and boiler heating elements operate simultaneously. NCHF models: tank and boiler heating elements do not operate simultaneously.

6 First Start-Up

6.1 First Start-Up

The electrical protection system must be tested. The appliance must be installed and started up by qualified staff, who will provide operating instructions.

6.2 Preparing for Use (Important)

Rinse aid dispenser is standard; detergent dispenser is on some models. Place external detergent and rinse aid containers and insert their intake hoses (red for detergent, blue for rinse aid) into them. Fit weights and filters onto hose ends. If the detergent dispenser is not factory-fitted, it can be retrofitted. Whenever changing detergent or rinse aid, flush the peristaltic pumps by placing intake pipes in water for a few cycles. Use only products recommended for professional dishwashers; failure to do so voids the warranty on the water system. Peristaltic pump hoses should be replaced by After-Sales Service every 12 months or 15,000 wash cycles.

6.3 Using the Water Softener (on models with this feature only)

The automatic water softener removes water hardness using regenerating salt. Add one liter of water to the salt tank on first use. Ensure the salt tank cap is firmly closed. Prevent mixture of water and detergent from entering the salt tank, as this impairs the regeneration system and voids warranty.

7 Control Panel

Buttons: On-off, Program selection, Start/Confirm/Pause, Total emptying (tank and boiler), Additional function selection.

Indicator Lights:

• L1: Mains power on light.
• L2: Operation status (Blue: dishwasher in operation/FILL running; Green: ready; Red: malfunction).
• L3: Pump-out in progress light.

Symbols:

• No rinse-aid symbol ?
• Tank heating element on symbol ?
• No salt symbol ?
• Boiler element on symbol ♨️
• No detergent symbol ?

7.1 Set-Up (Authorised Staff Only)

During first start-up, functions/parameters must be set or adjusted. To access the setup menu: with the tank empty, switch on and press/hold the ON/OFF button for 5-7 seconds until "--------" appears, then press again. Alternatively, with the tank full/door open, press/hold the ON/OFF button for 5-7 seconds until "--------" appears, then press again. Parameters can be scrolled using the program selection button and values selected using the start button. Quitting can be automatic (3 minutes inactivity) or manual (hold ON/OFF until beep).

7.2 Modifiable Parameters

• Rinsing temperature (boiler temperature): Adjustable setting.
• Washing temperature (tank temperature): Adjustable setting. Note: Displayed temperatures may differ slightly from actual temperatures due to probe inertia.
• Adjusting rinse aid dispensing: Incrementally adjustable (0.1 g/l up to 2 g/l). Default: 1.2 g/l. Do not exceed manufacturer's recommended amount.
• Adjusting detergent dispensing: Incrementally adjustable (0.2 g/l up to 20 g/l). Default: 2.6 g/l. Do not exceed manufacturer's recommended amount.
• Autostart function: 'On' to start cycle when door is closed; 'Off' to require confirmation with the start button.
• Regeneration frequency setup (models with softener): Set based on mains water hardness (H01-H06). H00 for no regeneration or water hardness over 60°f (requires external treatment). Table provided for hardness conversion (ppm/mg/l, German °d, French °f).
• Extra rinse: 'On' to add 10" to the rinse cycle; 'Off' disabled.
• "Clean water" cycle: 'On' to pump out tank water and refill with clean water at each wash cycle (increases detergent/rinse aid consumption); 'Off' disabled.
• Thermostop: 'On' ensures minimum rinsing temperature is met (cycle may be longer); 'Off' allows lower temperatures if hot intake water is not used (user responsible for maintaining correct temperatures).
• High speed (FST) or economy (ECO) filling: FST starts faster with higher initial water consumption; ECO starts in standard time with no added water consumption (tank temperature may be lower initially).
• Cycles performed counter: Shows total cycles performed; cannot be modified.
• USER program duration customisation: Allows customisation of the USER program (e.g., USER. 03.10).
• Service setting: For After-Sales Service access.

7.3 Starting the Peristaltic Pumps – Rapid Filling of Detergent and Rinse Aid Delivery Circuit

After parameter modification, with the dishwasher powered and tank full, press and hold the ON/OFF button for a few seconds until "------" appears, then press again quickly within 0.5 seconds. The pumps run until the button is pressed again. Rinse aid and detergent symbols flash alternately. Rinse aid pump fills in ~7 minutes; detergent pump in ~2 minutes. Draw only rinse aid for the first 5 minutes, then add detergent for the last 2 minutes. On some models, a "door" message may appear; reset by closing the door. If it persists, contact After-Sales Service.

8 Malfunctions Shown on the Display (For the Technician)

The dishwasher displays error codes for malfunctions. If the problem persists after restart, consult the following:

• Er 04: Tank temperature probe malfunction (disconnected or not working).
• Er 05: Tank water filling malfunction (e.g., tank not filled in expected time; check water supply, pressure, filter, hoses, pressure switch, drain pipe vent valve).
• Er 06: Water pump-out malfunction (check filter, drain pipe, drain pump for obstructions).
• Er 23: Boiler does not heat up as expected (check for continuous water entry, damaged heating element, contactor failure, safety thermostat, temperature probe, motherboard relay).
• Er 24: Boiler temperature probe malfunction (disconnected or not working).
• Er 25: Boiler water filling malfunction (check water supply, pressure, filter, hoses, boiler pressure switch, tube leakage, service setting "rP").
• Er 26: Boiler emptying malfunction (check rinse nozzles, boiler pressure switch, tube leakage, rinsing pump).
• Er 27: Boiler emptying malfunction with tank full, or boiler full signal on models without rinsing pump (faulty boiler pressure switch, check "rP" setting).

9 Instructions for the User

Control Panel Recap: On-off, Program selection, Start/Confirm/Pause, Total emptying, Additional function selection buttons. Lights: L1 (Power), L2 (Status: Green-Ready, Blue-Running, Red-Malfunction), L3 (Pump-out). Symbols: No rinse-aid ?, Tank heating ?, No salt ?, Boiler heating ♨️, No detergent ?.

9.1 Before Washing

• Use only detergents and rinse aids for industrial dishwashers. Do not use hand-washing detergents.
• Take care not to swap detergent and rinse aid products.
• Do not mix different detergents.
• Check: mains water tap is on, detergent and rinse aid levels are sufficient, regenerating salt is present (if fitted), filters are in place, spray arms rotate, no foreign bodies in the dishwasher.
• Switch on the master switch; decimal points appear on the display.

9.2 First Use Each Day (Tank and Boiler Empty)

With the door closed, press and hold the ON/OFF button. The display shows firmware version, then tank/boiler temperatures, then FILL. The boiler heating symbol remains lit until heating finishes. Once boiler water is heated, tank filling starts. Wait for "P1 - END" and L2 to turn green. Press the button quickly to view tank/boiler temperatures. Load dishes, close the door, and select the program. If Autostart is OFF, confirm program start by pressing and holding the Start button (L2 turns blue). Cycle progress is shown by bars. "END" flashes when the program finishes. Unload dishes. The system offers the last program run when closed again.

9.3 Operating Anomalies

• Door Opened: If the door is opened during a cycle, "CLOSE" flashes and the program stops. After closing, confirm program start by pressing and holding the Start button.
• Power Blackout: If a blackout occurs during a cycle, the program stops and restarts automatically when power is restored.

9.4 Program Change

Press and hold the Start button to interrupt a running program. Change the program using the program selection button. Confirm program start by pressing and holding the Start button (L2 turns blue). Heating symbols for tank and boiler may appear during heating phases.

Filter Presence Sensor: If the filter is not correctly positioned, "FiLTER" appears on the display.

10 Choosing the Program

Programs are displayed as P1, P2, etc., showing duration and temperatures. Select based on the type of dirt:

(*) Cycle duration is guaranteed with recommended intake water temperature. For repeated cycles, operating conditions may vary. Cold water supply may increase duration depending on intake temperature and "thermostop" setting.

(**) For P7 (Beer glasses), the dishwasher must be connected to a cold water supply. The program does not provide rinse-aid dispensing during the final rinse. If selected after a hot rinse cycle, at least two cycles are needed for the rinse to become cold.

Power Blackouts: If the dishwasher is open during a blackout, the display shows "°t" and heating elements remain off to prevent burns. Close the dishwasher to resume heating.

11 Baskets Provided

Basket shape and material vary by model. Extra baskets can be purchased. It is recommended to use intact baskets and not tamper with plastic runners.

• Glasses: Place glasses downwards.
• Cutlery: Use the dedicated basket. Place cutlery randomly, preferably with handles downwards. Use caution with sharp edges.

12 Maintenance and Cleaning

Annual servicing by an authorized center is recommended. Use genuine parts. The manufacturer is not liable for damage from misuse, neglect, or incorrect connections. The dishwasher has IPX4 protection, but direct water jets are forbidden.

• Cleaning: Remove filters, clean them, and rinse with plenty of water. Do not use sharp tools. Clean away limescale deposits. Leave the door ajar when not in use. Clean surfaces with a damp cloth and neutral, non-abrasive detergents without chlorine compounds.

12.1 Cleaning the Filter During the Day

For heavy-duty use, clean the filter every 30-40 cycles using the "partial tank pump-out" routine (P0). Press and hold the Total Emptying button until "P0" appears, then confirm. After pump-out, clean the filter and press the Start button to refill.

12.2 Total Pump-out at the End of the Day

Press the Total Emptying button to start the automatic cleaning cycle. The display shows "UNL". The appliance switches off upon completion. Never switch off the dishwasher with water in the tank; always pump out first.

12.3 Resin Regeneration (for models with softener)

Regeneration is indicated by "DO REGE" on the display. It can be performed "ON REQUEST" (press button, REGE RUN appears, then P0, FILL) or "AT THE END OF THE DAY" (press button until "REGE RUN" appears). The cycle cannot be interrupted. The appliance switches OFF after completion and pump-out.

12.4 Topping Up with Regenerating Salt (for models with softener)

Use specific salt only. Add salt when the indicator light for the salt symbol ? illuminates. Refill the salt container (approx. 1 kg). Procedure: start tank pump-out, refill salt, fill tank (FILL), restart tank pump-out, remove salt residues from the tank bottom to prevent corrosion. This prevents washing water from entering the salt container.

12.5 Routine Inspection of the Spray Arm (Once a Week)

Remove upper and lower spray arms by unscrewing the central ring nut. Clean spray arms under clean running water. Do not unscrew nozzles. Reinstall spray arms. Do not use tools that could cause damage.

12.6 Lengthy Periods Out of Use

To prevent crystallization and pump damage, empty detergent and rinse aid dispensers. Remove intake hoses, place them in clean water, run a few wash cycles, and perform a total pump-out. Turn off the master switch, close the water intake valve, and leave the door ajar to dry. Reinsert hoses correctly when returning to service.

Troubleshooting

If the pump is not working properly: empty the dishwasher, disconnect power, remove screw A, release tab B, and check if the pump impeller rotates freely without obstructions.

13 Malfunctions Shown on the Display (For the User)

The dishwasher displays error codes. If the problem persists after restart, follow these steps and note the error code for After-Sales Service:

• Err 04: Tank temperature probe anomaly. Contact After-Sales Service.
• Err 05: Tank water filling anomaly. Check water supply tap, pressure, inlet filter. Contact After-Sales Service if problem persists.
• Err 06: Water pump-out anomaly (water remains in dishwasher). Check filters, drain pipe, drain pump for obstructions. Contact After-Sales Service if problem persists.
• Err 09: Excessive water level in the tank anomaly. Contact After-Sales Service.
• Err 23: Boiler heating anomaly (does not heat). Contact After-Sales Service.
• Err 24: Boiler temperature probe anomaly. Contact After-Sales Service.
• Err 25: Boiler water filling anomaly. Check water supply tap, pressure, inlet filter. Contact After-Sales Service if problem persists.
• Err 26: Boiler emptying anomaly. Check rinse nozzles. Contact After-Sales Service if problem persists.
• Err 27: Boiler emptying anomaly – with full tank. Contact After-Sales Service.
• Err 28: Boiler heating anomaly (over temperature). Contact After-Sales Service.