short description

Product description

Features

• RLT Compact unit with heat recovery.
• Ready to connect with integrated controller and automatic bypass.
• Horizontal design (H): optionally for indoor installation or ceiling mounting, with rain cover and external hood also suitable as a flat unit for outdoor installation.
• Vertical design (V): optionally for indoor or outdoor installation.
• Easy to access for maintenance thanks to inspection doors that can be opened at side and removed.
• Device classification A1 according to DIN 4102 (non-combustible).

Application field

• Highly efficient compact air handling units with heat recovery for commercial, industrial, office and residential buildings.

Housing

• Monoblock housing in self-supporting frame construction.
• The housing structure consists of aluminium profiles with thermal separators with polyamide spacers built into the profile (class TB2 in accordance with EN 1886).
• The corners are made of glass fibre reinforced polyamide.
• The insulation between the double-walled panels consists of 45 mm (70 kg/m³) rock wool, which results in thermal transmittance class T2.
• Device classification A1 according to DIN 4102 (non-combustible).
• Enclosure classification according to DIN EN 1886:
• Heat transfer coefficient: T2
• Thermal bridge factor: TB2
• Housing leakage class: L2
• Mechanical stability: D1
• Filter bypass leakage: F9 (=<2%)
• The exterior panels are powder coated in grey, similar to RAL 7047.
• The interior is made of galvanised sheet steel with smooth inner surfaces.
• Electrical cables are laid in the cable protection ducts on spacers.
• Condensate tray made of stainless steel, all other components are made of galvanised steel, aluminium or stainless steel and comply with VDI 6022 hygiene standards.
• Generously sized inspection openings allow single access to all internal components at maintenance work.

Panels and inspection doors

• Thermal bridge optimised panels and inspection doors made of galvanised sheet steel, thermally decoupled, powder coated for special protection against corrosion.
• Double-walled sandwich construction of the panels with interior, non-combustible rock wool (thickness: 45 mm, density 70 kg/m³, building material class A1 according to DIN 4102 (non-combustible)) for optimum sound and thermal insulation.
• The inspection doors are equipped with pressure-adaptive sealing to adjust to the pressure conditions inside the unit.

Coating

• The exterior panels are UV-resistant and powder coated in grey, similar to RAL 7047. The coating offers special protection against corrosion.

Mounting

• The device is equipped with 180 mm high profile feet for standing floor mounting.
• The profile feet can be removed at need.
• For suspended ceiling mounting, the horizontal unit (H) can be equipped with optional ceiling installation brackets for M12 threaded rods.
• The following are optionally available for outdoor installation:
• Outside air and outgoing air shutters with shutter actuator
• Rain protection for shutter actuator
• Outside and exhaust air hoods
• Rain cover
• Vacuum siphon
• Siphon trace heating

Fans

• Direct-drive, single-suction EC centrifugal fans with backward curved impeller blades made of composite material for optimised efficiency and minimised noise level.
• Maintenance-free, sealed ball bearings with long-term lubrication.
• Mounting directly in the front chamber without additional mounting rails for complete cleanability in accordance with VDI 6022.
• Impeller made of high-strength composite materials with flow-optimised inlet nozzle made of galvanised sheet steel with pressure measuring connection.
• Statically and dynamically balanced impeller in accordance with DIN ISO 21940-11.
• Vibration tested in accordance with ISO 14694, maximum vibration intensity is 3.5 mm/s.
• EC external rotor motor with integrated control electronics without rare earth magnets, featuring highly efficient electronic commutation (EC), integrated thermal switch-off and speed control.
• EC technology is an environmentally friendly solution that guarantees low energy consumption for control and regulation of the operating point at volume flows of 10 to 100%.
• This promotes a low noise level for improved acoustic comfort.
• Integrated blockage protection, phase failure detection, soft start, over-temperature protection electronics, motor undervoltage failure detection, power limitation, motor current limitation.
• The fans comply with current EMC directives and requirements regarding mains interference and EMC interference immunity.
• Fan protection class: IP 55, insulation class "F", humidity (F) / environmental protection class (H) H1.
• The efficiency class of the motor exceeds class IE4.

Heat recovery

• Highly efficient hexagonal counter current plate heat exchanger made of seawater-resistant aluminium.
• Efficiency > 90% according to DIN EN 13141-7; greater than 87% according to ErP Ecodesign Directive 1253/2014.
• Eurovent certified.
• For utilising the sensible and latent heat energy contained in air flows.
• The outside air and exhaust air flows are guided past each other separately via parallel thin aluminium plates using the counterflow principle.

Condensate tray

• Hygienically perfect condensate drain thanks to stainless steel condensate tray in unit. Connection diameter ½".
• Placed completely under the heat exchanger.

Bypass shutter

• Modulating through continuously regulating bypass drive.
• Manual adjustment possible with push button.
• The drive is overload-proof and maintenance-free.
• Power consumption during operation: 1.5 W; power consumption in idle mode: 0.4 W.
• Bypass shutters in aluminium casing with gear drive and counter-rotating, plastic-mounted aluminium profile blades with sealing lip, tightness class 2 in accordance with DIN EN 1751.
• Shutter drive and gears located outside the air flow, making it suitable for increased hygiene requirements in accordance with VDI 6022.
• Energy-saving, pre-wired shutter drive as a continuously regulating servomotor for modulation from 0 to 100%.
• The integrated bypass in the outside air/supply air flow ensures frost protection in the event of freezing and provides free cooling in summer.
• If the unit is equipped with an electrical pre-heater, the control system automatically selects the optimum solution.
• In summer, the bypass regulates the set supply air temperature by means of modulation.

Filter:

• ISO ePM1 50 % (F7) filter at the outside air inlet and ISO ePM10 50 % (M5) panel filter at the exhaust air inlet. Filters are mounted on rails with lip seals to guarantee effective air sealing.
• The filters are always installed in front of the respective components to guarantee their protection.
• Filter signalling via pressure difference measurement on the outside air filter and exhaust air filter, adjustable from 50 up to 500 pascals, preset to 150 pascals.

Rectangular duct connection

• The devices have rectangular duct connections and are designed for connection to rectangular ducts with a 20 mm profile.
• The profile must be supplemented with a sealing strip.
• Transition adapters are available as an option for connection to round ducts.

Shut-off dampers for outside air and outgoing air

• Outside air and outgoing air shutters in aluminium housing with gear drive and counter-rotating, plastic-mounted aluminium profile blades with sealing lip, tightness class 2 in accordance with DIN EN 1751.
• The shutter drive and gears are located outside the air flow, making them suitable for increased hygiene requirements in accordance with VDI 6022.
• Outside air and outgoing air shutters can be ordered optionally.
• When ordered, the shutters are factory-mounted outside of the device frame and the servomotor is electrically connected.

Technical compartment

• Separate, lockable technical compartment with protection class IP 65, in which the electrical components and the control system are housed.
• Separate compartment within the technical compartment for the enclosed circuit diagram booklet.
• Cable ends within the technical compartment are clearly numbered using cable identification at each connection point and in the enclosed connection diagram to prevent confusion.

Cable connection

• Plug & play connection: 5-pin connector on terminal block X1 inside the separate, lockable technical compartment.
• Recommended residual current circuit breaker: Class B or B+, tripping residual current see technical data.
• Recommended fuses for mains connection: D-Type "slow-blow"; D-10,000 A – AC3

Electrical wiring

• Industrially manufactured cable harness, clear cable routing and unobstructed access to components at maintenance, as well as optimum cleaning options for surfaces.
• Neat cable routing with individual cable protection sleeves and spacers to the components inside the unit.
• Cable protection sleeves inserted into cable screw connection, no open cables visible.

Control

• Fully integrated, completely wired control unit including main switch with all-pole isolation.
• Control unit fully integrated in technical compartment with IP 65 degree of protection to protect against environmental influences.
• Integrated web browser.
• Integrated safety elements for all control and regulation functions tailored to the ventilation unit:
• Motor protection switch with phase failure detection, short-circuit protection with magnetic short-circuit release.
• Circuit breaker 230 V, tripping characteristic class C.
• IG service switch, 4-phase, IP 54, CE compliant.
• Guaranteeing electrical safety in accordance with the following directives: Machinery Directive 2006/42/EC (including Low Voltage Directive), EMC Directive 2014/30/EU, and complete functional testing at factory.
• Ready for operation with service switch.
• Integrated switchable power unit 230 VAC / 24 V DC, 2.5 A.
• Time programming for weekly schedules including holidays and bank holidays for an entire year.
• Automatic summer and winter time changeover.
• Individual timetable for each day of the week plus separate holiday and bank holiday timetable.
• Up to 24 different holiday periods/bank holidays can be set.
• A holiday period can range from a single day up to 365 consecutive days.
• There are 8 different menus available, one for each day of the week and an additional one for holidays.
• Holiday plans take precedence over other weekday schedules.
• Each weekday schedule has up to two individual usage times.
• Daily individual time programmes available for level 2 and level 1, each with up to two usage times.

Operating mode / Mode

• The integrated controller is factory-set to the operating mode specified in the order.
• At device ordering, the required operating mode must be defined:
• This ensures reliable operating mode, as no on-site interventions in the unit are required.

Alarm message

• Alarms are logged in the alarm list.
• The list shows the type of alarm as well as date and time.

Languages

• German, French, Russian, Dutch, English, Swedish.

Interfaces

• The following interfaces for integration into building control systems are available as a standard feature:
• Ethernet interface for
• Modbus TCP/IP protocol
• BACnet/IP: BACnet-AAC (Advanced Application Controller) protocol
• RS 485 interface for
• Modbus RTU

Control module

• The RLT air handling unit comes with a control module for wall installation/device mounting.
• The control module is wired and has a four-line, backlit LCD display.

General information

• The RLT air handling units are available in 5 volumetric flow ranges up to nominal 5500 m³/h and 4 configurations with the options horizontal left, horizontal right, vertical left and vertical right.
• Heating and cooling registers as well as shut-off dampers can be added as options.
• Accessories for weatherproof outdoor installation round off the system.

Optional accessories

• External pump cold water or DX cooling register.
• Internal electrical preheating register [PH].
• Internal electric heating register [EH].
• Internal pump hot water heating register [WH].
• Touch display.
• Sound absorber.
• Outside air / outgoing air shutters with servomotor.
• Rain cover for outdoor installation.
• Outside air / outgoing air hoods for outdoor installation.

Approvals, certificates and guidelines

• ErP compliant, VDI 6022 compliant.
• Compliance with the following directives: Machinery Directive 2006/42/EC (including Low Voltage Directive), EMC Directive 2014/30/EU, Ecodesign Directive 2009/125/EC (Regulation No. 1253/2014 – LOT6), RoHS 2 Directive 2011/65/EU.

• Operating mode: Mode 3.Constant pressure control parameterised. Integrated pressure sensor. Constant pressure operation with variable volumetric flow (VAV control) with supply air control via integrated pressure sensor and slave-connected exhaust air fan.