Rooftop Packaged Units

Specification

• Single-sided intake, rear-curved motor impeller, energy-optimised for operation without spiral housing through special blade design with rotating, vaneless diffuser for high efficiency and with favourable acoustic behaviour
• Impeller: ø 250-630mm in 9 frame sizes
• Centrifugal impeller made of high-strength composite material, with external rotor motor statically and dynamically balanced acc ISO 1940 Part 1
• Fitting position: horizontal and vertical
• Impeller with rotating diffuser
• 7 rear-curved, profiled blades
• Galvanised inlet nozzle with volume flow rate measuring equipment
• Design with integrated electronics
• Over-temperature protection of the device electronics through active temperature management
• Motor painted RAL 5002 (ultramarine blue); impeller colour; RAL 5002 (ultramarine blue)
• Protection class IP54
• Thermal class 155
• The permissible ambient temperature is -20⁰C to +60⁰C
• Fan characteristic curve refer to measurements made on an inlet-side chamber test rig acc DIN 241623 Part 2 or ISO 5801
• Performance specifications comply with Precision Class 2 acc DIN 24166
• The motor efficiency class complies with IE4

The fan impeller is made using specially developed high-performance composite material and combines unique material properties with bionic insights.

The high-performance composite material makes it possible to create the innovative shape of the new centrifugal fan. The exceptional quality achieved is the result of a one-shot injection moulding process, so it does not have any welded seams or critical connections. The new shape produces higher efficiency, enabling performance which saves up to 15% energy during operation.

With its specifically profiled three-dimensional blade geometry, the impeller produces up to 5dB less tonal noise in use (3dB = physical halving). This reduction in noise makes living and working in the

surrounding more pleasant. Furthermore, less acoustic insulating material is needed – this protects the environment and saves money at the same time.

The composite material combines the positive properties of both steel and composite material:

• Weight reduction of more than 50% as compared with a steel impeller – this reduces motor bearing loads, guaranteeing longer system lifetimes.
• The impeller geometry allows tip speeds of up to 70 m/s (60 m/s are customary in the market) – which is only otherwise possible with a steel impeller.
• No weld seams
• Can be combined with various types of motors
• Tonal noise reduction of up to 5dB
• Suitable for operational temperatures from -20⁰C to +80⁰C comparable with steel impellers
• Corrosion free
• No toxic gas emissions
• Colour stable

The reduced energy usage during manufacture is followed by up to 15% energy which is saved during use. Moreover, the material can be crushed after the end of the life of the impeller and is 100% recyclable, so there is no waste whatsoever.

The innovative technologies even now exceed the EU minimum efficiency threshold regulations which will come into effect in 2015.

Extremely light, stable, durable, quiet and efficient

Full modulation capabilities (10 to 100%)

• Immediate load adjustment
• Step less modulation / close temperature control (+/- 1k)
• Optimal comfort
• Low condensing capabilities
• Possibility to fully modulate the supply air fan – large savings on fan aborbed power -> high season efficiencies
• No complicated electronics and no additional components, simple system architecture
• Easy to install, commission and maintain

Constant speed operation = easy oil return management

No impact on the system mechanical balance found with inverter

• No vibration and resonance phenomenon
• No frame / piping redesign work necessary

No EMC noise issues

High reliability due to less starts and stops

Reduce number of units for multiple evaporator system

• Minimum floor space requirements with maximum cooling capacity

Filters and filter housings to EN779 and EN1886. Aluminium washable filters class G4 shall be installed in the return air.

Each filter shall have a filter pressure drop monitoring with the actual pressure drop displayed on the control panel and low level alarm when filter dirty as a clear text message on the controller.

Advantages:

• low pressure drop
• washable
• filter dirty alarm and text message
• takes out the larger particles which would usually clog finer filters

Filters and filter housings to EN779 and EN1886.

Bag filters class F7 shall be installed in the supply air.

Filters shall not be installed in any mixed air stream.

Fully incinerable filters with plastic frames.

Filter housing to EN1886 with filter bypass leakage to class F8.

Each filter shall have a filter pressure drop monitoring with the actual pressure drop displayed on the control panel and low level alarm when filter dirty as a clear text message on the controller.

The entire filter element is non-corroding and fully incinerable, since it contains no metal parts. The frame consists of halogen free plastic.

Viledon MVP filters are microbiologically inactive and meet all the criteria of VDI guideline 6022 “Hygiene requirements for HVAC systems”.

MVP cassette filters excel in terms of high dust holding capacity and low pressure drop and offer an optimum price performance ratio.

The leak proof casting of the dimensionally stable media pleat pack provides high burst strength, as well as excellent security against dust penetration during operation.

Advantages:

• Suitable for 100% RH
• Do not require frost protection
• Low pressure drop
• Plastic frame
• Corrosion free
• Can be incinerated
• Filter dirty alarm and text message

The control system shall have the facility for remote monitoring and adjustment by the supplier over an analogue or ISDN modem.

The unit shall include an interface or gateway approved for use with the following BMS systems:

• Bacnet over IP

The interface shall provide access to data points giving information on all temperature and humidity values, actuator positions, status of all motors, hours run, actual supply and return air flow in m3/h, filter pressure drop displayed in Pa.

The function control software and all aspects of control and regulation devices shall be tested and documented under a certified EN ISO 9001 : 2000 quality system.

Control functions shall include:

• Sensor monitoring – short circuits, cable breakdowns etc. shall activate general fault indication with a clear text. Fault indication – scheduled as high and low level alarms and shown on LED’s and in clear text on the display.   For remote indication of fault signals, potential free signals shall also be available on the terminal strip.
• Operating mode simulations shall be provided for testing, commissioning, maintenance or in the event of an emergency.