Product features
- Flush ceiling mounting for maximum hygiene and maximum room height utilisation
- Draught-free working owing to low air speed
- EC fans for energy-efficient operation (up to top mark A+)
- Easy access to the entire unit for cleaning and maintenance work
- Low moisture loss in goods thanks to large surfaces and a highly efficient tube system
- Particularly quiet design for a pleasant working atmosphere
Top class ceiling air cooler
The energy-efficient dual discharge ceiling air cooler meets the requirements of cold rooms above freezing point. With its draught-free, quiet running and various corrosion protection types, it is particularly suitable for use in food processing, storage and logistics, commercial cooling and similar applications. Its design allows easy access for cleaning and maintenance work.
The DHN is used in these areas of application
Food Industry
Especially high demands are placed on refrigeration in the food industry.
Hygiene, energy efficiency and reliability are the top priorities.
But even when it comes to requirements for refrigerants, corrosion protection, material combinations, practical fin spacing, optimised tube and fin geometries, uniform air distribution or energy efficiency, Roller offers the optimised solution for every performance range and every application with its wide product range of evaporators and air coolers.
Storage & Logistics
The requirements for cooling in warehouse logistics could not be more diverse. The tasks are very specific:
In plus cold stores for fruit and vegetables, it is crucial that the sensitive chilled goods are stored in the right conditions and cooled gently. Dairy products are highly perishable and require a closed cold chain. Ripening chambers turn fruit varieties into products ready for sale.
In deep-freeze warehouses, uniform temperature distribution is important, reliable air coolers protect against thawing of the goods. In order-picking rooms, the impact on employees must be minimised. Roller offers a variety of individual solutions for all applications.
Commercial refrigeration
The range of refrigeration technology for the retail trade is broad. Whether it's a butcher's shop, bakery, flower shop, petrol station, restaurant or supermarket - each sector has its own requirements to ensure optimum product quality.
One thing is always in the foreground: reliability in refrigeration technology when it comes to failure safety, hygiene or energy efficiency. Roller is the specialist for air coolers, evaporators and heat exchangers for the commercial sector.
HVAC industry
Today, a multitude of different applications such as server rooms, clean rooms, medical facilities and practices, shops, offices, greenhouses, and so on, place specific demands on building technology.
The right temperature, air quality and air movement play an important role. Here, with individual heat exchangers, we offer suitable solutions for a wide range of tasks.
The robust HKN air-conditioning unit stands for barely noticeable conditioning and a comfortable indoor climate with high energy efficiency.
- Food Industry
- Storage & Logistics
- Commercial refrigeration
- HVAC industry
Product benefits
Your advantages at DHN
Corrosion protection
for heat exchanger with tin-coated cupper tubes and 2-component lacquered coating
EC-fan technology
standard for optimum energy efficiency in all sizes
Flush ceiling mounting
for maximum hygiene and maximum room height utilisation
Double drip pan construction
to avoid condensation
Thick fins:
Heat exchanger with thick fins for cleaning with a high-pressure cleaner
High-performance tube systems:
Aligned Roller high-performance tube systems with internally grooved tubes
Dehumidification mode
with downstream electric heating rods (option)
Fully aluminium housing,
scratchproof powder-coated finish
Features
All product advantages at a glance
General
- Cooling capacity from 1.5 to 20 kW
- Temperature range: 0 – 50 °C
- Fin spacings 4 / 6 mm
- Defrosting: electric, optional: Brine, hot gas
- Heat exchanger coil for an operating pressure of 25 bar/ 80 bar with CO2
- Very quiet EC fans
Easy assembly
- Generously sized spaces at the sides of the unit for easy access via side doors, removable
- Drip pan for cleaning and servicing work hinged on both sides and easily removable
- Connections with threaded nipple, ventilation and drain valve (water or brine mode)
- Both evaporator coils are brought together on a shared inlet and outlet tube
Inspection and cleaning
- Removable hinged drip pan for cleaning and servicing work
- Side doors can easily be removed
- Aligned tube pattern and fin spacings of up to 6 mm for easy cleaning
- Design geared to the HACCP concept (easy access to the entire unit for cleaning and maintenance work)
- Heat exchanger can be cleaned from three sides
- Thick fins (0.3 mm) for extra stability during cleaning
Energy efficiency
- Air cooler energy efficiency class up to top mark "A+"
- EC fans with maximum energy efficiency for a high system efficiency
- Adjustment of the air volume flow according to the cooling load via external controller (0 - 10 V)
- Multi-fan units with intermediate plates (fan chambers) for optimum flow through the heat exchanger
- High-performance heat exchanger with a low height and low interior volume
- Optimised, aligned pipe system with smooth fins ensures low air-side pressure drop and high air flow rate
Corrosion protection
- Corrosion-resistant aluminium housing with scratchproof powder coating
- Corrosion protection for the heat exchanger and housing to withstand a range of environmental conditions
- Stainless steel ceiling mounting integrated into the unit
- Stainless steel housing (optional)
- All corrosion protection variants at a glance
Defrosting
- Large heat exchanger surfaces remove less moisture from the air and thus reduce the need for defrosting
- Defrost safety thermostat interrupts electric defrosting if the defrost control system (accessory) malfunctions
- MS coil heating rods for retrofitting at room temperatures above 0 °C
Accessories
Find suitable accessories for the DHN
Thermal heating with protection grille
for extra dehumidification - can easily be retrofitted
EVD-ice:
Electronic e-valve and superheat controller for efficient, safe operation and quick start-up
Defrost safety thermostat
Switch contact opens at +25 °C and closes at +6 °C
Heating rods:
MS heating rods for coil defrosting (tR > 0 °C) (IP66) - easily retrofittable
References
Order-picking warehouse - DHN/KVN - Klüvers
Order picking warehouses are particularly susceptible to the effects of air from outdoors which enters when the doors are open. To ensure that the cold chain is not interrupted high-performance air coolers which can cope with the resulting moisture are required. An effective defrosting system is particularly important here. The company Klüvers relies on DHN air coolers from Roller with their reliable and efficient defrosting system.
| Application | Order-picking warehouse |
|---|---|
| Address | Niendorf / Baltic sea - Germany |
| Fluid | HFC |
| Product | DHN and KVN |
Butchery cooling - DHN/FHV - Biaggini
High-quality meat and sausage products have a long tradition in the canton of Ticino (Switzerland), and preparation is still done with great passion. That's why these specialities are a real treat for the palate. In addition to the good ingredients and the know-how, the appropriate equipment is of course also required for the perfect result. The butcher's shop Bozzini in Biasca has invested in advanced refrigeration and counter technology and commissioned Biaggini to equip the refrigeration systems. The technology behind the attractive salesroom is all made by brand-name manufacturers. The DHN ceiling-mounted air cooler was chosen for hygienic and draught-free operation in the cutting room. In the two cold rooms, Biaggini relies on the tried-and-tested FHV cubic Roller air coolers, which not only ensure the correct temperature control but also the high quality of the chilled goods.
| Application | Commercial Refrigeration |
|---|---|
| Address | Biasca / Swiss |
| Fluid | HFC |
| Product | DHN & FHV |
Fruit cooling - DHN- Coop Swiss
Correct refrigeration is crucial to how fresh the fruit and vegetables are when they reach the retailer's counters. An equal distribution of product-specific temperatures while maintaining the correct humidity levels are just as important as protection against other environmental influences. For this cold store for organic fruit and vegetables in Switzerland, our customer Biagginifrigoriferi used double-sided discharge CO2 ceiling aircoolers of type DHN.
| Application | Fruit and vegetable cooling |
|---|---|
| Address | Bern - Swiss |
| Fluid | CO2 |
| Product | DHN |
Meat processing - DHN- Klüvers
When processing meat, quick and reliable cooling plays a key role in the quality of the final product. In addition, air coolers come under the hygiene concept of a company and must therefore meet the requirements of the HACCP concept. Easy cleaning is particularly important here. During cleaning, aggressive cleaning products are used and the air coolers need to be resistant to these. The company Klüvers relies on DHN air coolers from Roller with a full powder coating for optimum corrosion protection.
| Application | Meat processing |
|---|---|
| Address | Niendorf / Baltic sea - Germany |
| Fluid | HFC |
| Product | DHN |
Event catering - DHN - Taggenbrunn
The Taggenbrunn hotel requires reliable food cooling systems for its exclusive guest receptions and concerts. High-quality food and drinks and especially the wine collection must be cooled to the right temperature. The attractive air coolers from Roller fit in ideally in the castle architecture. The air coolers were delivered to the wholesaler Schiessl in Pörtschach straight from the factory.
| Application | Gastronomy |
|---|---|
| Address | Taggenbrunn / Austria |
| Fluid | R134a |
| Product | DHN |
Technical Data
All important technical data at a glance
| Product name | DHN |
| Capacity range | 1,5 - 20 kW |
| Temperature range | 0 °C to 50°C |
| Defrost heater | Without |
| Tubes | Internally grooved |
| Tube system | Aligned |
| Number of fans | 1 - 4 |
| Fan type | EC / forced / IP 54 |
| Fan size | 350 mm |
| Fin spacing | 4 / 6 mm |
| Energy efficiency class | A+ to B |
How can we help you?
We consult you competently and comprehensively!
Make a concrete enquiry now!
Tel.: +49 (0) 7156 / 2001-30
markus.mank@walterroller.de
