For a pleasant feeling of well-being
The Rosenberg SupraBox COMFORT energy recovery units are space-saving and distinguished primarily by their high energy efficiency. They provide an energy-saving ventilation system for real estate such as restaurants, retail shops, hotels, office buildings and many more. As a ceiling option, the SupraBox COMFORT units are available in two sizes with different nominal air flow rates. These range from 1,100-1,900 m³/h.
Depending on local conditions, you can choose between a left and a right unit design for each size.
- Right design:
- Supply air connection RIGHT (facing the operator side)
- Left design:
- Supply air connection LEFT (facing the operator side)
SupraBox COMFORT D - Unit Overview
| SupraBox COMFORT | Nominal air flow rate | External pressure increase |
|---|---|---|
| 1100 D | 1,100 m³/h | 200 Pa |
| 1900 D | 1,900 m³/h | 250 Pa |
Properties
Hygiene requirements
The SupraBox COMFORT energy recovery unit corresponds to the current state of standardisation in accordance with VDI 6022. The units are smooth (coil coated inside and out - RAL 7035) and easy to clean.
Casing
The units have a sturdy frameless casing. The casing has a double-skinned design. The inner and outer panels are made of 1 mm galvanised steel sheet (coil coated). The insulation thickness is 40 mm.
Heat recovery
High efficiency counterflow heat exchangers with over 90% efficiency are utilised for heat recovery. Complete separation of the supply air and return air without odour transfer is ensured.
Filter
Fine dust filters of the F7 filter class for the supply air and the M5 class (formerly F5) for the return air are utilised as a standard feature. Quick-release clips allow for fast and easy filter changes.
Tube / duct connections
The connections are designed to be sufficiently large. The connection dimensions comply with the customary industrial standard nominal sizes (round connection with SupraBox COMFORT 1100 D ; square connection with SupraBox COMFORT 1900 D).
EC fans
Free-running impellers with backward curved centrifugal impellers and modern EC motors manufactured in-house allow for a quiet and energy-efficient operation of the entire series.
Integrated Control
The SupraBox COMFORT energy recovery units come standard with an integrated control. All internal unit components are already pre-wired. Temperature control is possible with an optionally available heater/cooler. Many control functions are integrated into the software and can also easily be subsequently activated. A control unit for setting the target values is included as standard.
» Accessories
Transition piece square to round
- available for SupraBox COMFORT 1900 D
- for the transition to round ducts
- made of galvanised sheet steel
- optional on DN 355 or DN 400
(additional accessories depend in part on the selected transition piece!) - T-double lip seal for tight connection
Duct silencer
- available for all SupraBox COMFORT (D)
(assignment for SupraBox COMFORT 1900 D depending on the selected transition piece) - round connections
- outer casing and perforated inner duct of galvanised sheet steel
- sound dampening 50 mm
- socket with lip seal
- for direct integration into the pipe system
Flexible connections
- available for all SupraBox COMFORT (D)
- with SupraBox COMFORT 1100 D with round connections
- with SupraBox COMFORT 1900 D with square connections
(transition to round can be done afterwards) - for decoupling the SupraBox to the duct system
- complete set consisting of 4 pieces
- made of galvanised steel and silicone-free PVC fabric
- the right connection for standard spiral ducts
- T-lip seal for quick and tight connections
Manually-operated shut-off valve
- available for SupraBox COMFORT 1100 D
- round connections
- tight-sealing, tightness category 4 behind closed baffle
- damper blade is made of doubled sheet steel and has a gasket
of EPDM rubber placed in between the blades which rests
on the inside of the valve sleeve when closed
Motor-driven shut-off valve
- available for all SupraBox COMFORT
- with SupraBox COMFORT 1100 D with round connections
- with SupraBox COMFORT 1900 D with square connections
- tight fitting, tightness category 4 behind closed baffle
(tightness category 2 with shut-off valve for SupraBox COMFORT 1900 D) - design as manually operated shut-off valve, but with console for motor drive
including suitable servo motor - function open/close, voltage 24V, without return spring
(with return spring upon request)
Electronic reheater coil
- available for all SupraBox COMFORT (D)
(assignment for SupraBox COMFORT 1900 D depending on the selected transition piece) - round connections
- for post-tempering of the supply air
- installation kit consisting of electric heater coil and duct temperature sensor
- available in different capacities
- integrated continuous electronic control with thyristor,
allowing for capacity control from 0-100% - actuation of the control electronics via the SupraBox via 0...10V
- caution: only suitable for indoor installation
PTC electronic pre-heater
- available for SupraBox COMFORT 1100 D
(for SupraBox COMFORT 1900 D electronic pre-heater as installation kit) - for optimum antifreeze protection
- installation kit for installation in the outdoor air outlet
- PTC electronic pre-heater and duct temperature sensor
- integrated temperature sensor
- caution: only suitable for indoor installation
Electronic pre-heater
- available for SupraBox COMFORT 1900 D
- for optimum antifreeze protection
- coil similar to the electronic repeaters
- switching on and off via SupraBox
(integrated contactor) - caution: only suitable for indoor installation
PWW Reheater
- available for all SupraBox COMFORT
(transitions round; in SupraBox COMFORT 1900 D without transitions) - for post-tempering of the supply air
- available per size with 2 or 4 pipe series
- galvanised steel frame
- blade spacing 2.0 mm, equivalent to DIN EN 13053
- antifreeze protection thermostat already mounted on coil frame
PKW Aftercooler
- available for all SupraBox COMFORT
(transitions round; in SupraBox COMFORT 1900 D without transitions) - for post-tempering of the supply air
- galvanised steel frame
- condensate tub aluminium AlMg3, condensate drain 1/2"
- blade spacing 2.5 mm, equivalent to DIN EN 13053
Replacement filter, exhaust filter M5
- available for all SupraBox COMFORT
Replacement filter, supply air filter F7
- available for all SupraBox COMFORT
» Defrosting concept / antifreeze protection
Freezing of the heat exchanger
The surface temperature of the counterflow plate heat exchanger decreases with falling outside temperatures. If this falls below the dew point of the exhaust air, condensate drops on the plates of the heat exchanger. The dew point depends on the absolute humidity content of the air. Although the condensation energy of the water increases the efficiency of the counterflow plate heat exchanger that is related to the air supply, freezing takes place here under certain conditions.
If the units of the SupraBox COMFORT series are used in applications where the exhaust air is only slightly humid, heat recovery can work well below -10°C without losses. If the exhaust air comes from wet rooms, however, antifreeze protection may already be needed at -5°C and below.
Since the average outdoor temperature in Central Europe is typically above 0°C during the heating season, there are only a few days a year where antifreeze protection is necessary. Thus, efficiency rating reductions in this area have a diminishing impact on the efficiency rating of the unit over the whole year.
Intelligent 3-sequence defrosting concept
All compact air handling units in the SupraBox COMFORT series include an intelligent 3-sequence defrosting concept. The special feature here is that the integrated bypass of the equipment is NOT used to defrost the counterflow plate heat exchanger. An expensive, highly dimensioned reheater is not needed because the heat recovery is not bypassed.
Depending on the settings done during the commissioning as well as the accessories used, up to 3 sequences are available to defrost the counterflow plate heat exchanger. These are explained as follows.
The counterflow plate heat exchanger is monitored for freezing using a differential pressure switch. If the heat exchanger freezes, this is detected by the differential pressure switch and the defrosting operation is initiated automatically by the control.
During commissioning, the antifreeze strategy to be used can be defined (sequences).
- If an imbalance of the fans is allowed (adjustable via keypad), the supply air fan is reduced by 30% in the event of freezing to generate defrosting from the warmer exhaust air.
- If an electronic preheating is connected (accessory) and released (adjustable via keypad), this is activated in the event of freezing to preheat the outside air and thus defrost the heat exchanger.
- If both options have been released, the supply air will be reduced first. If this is not sufficient, the preheating is activated after 5 minutes.
- If neither measure is effective or none of the measures are possible (missing release), the SupraBox COMFORT is disabled and an alarm is displayed. After 10 minutes, the SupraBox COMFORT restarts the fans automatically and the sequences are "executed" again. An acknowledgement of the alarm is not necessary.
Antifreeze protection - preheating for prevention
Optionally, the preheating can be used preventively by setting the control unit of the SupraBox COMFORT unit. If this is the case, the pre-heating is already switched on at an adjustable outdoor air temperature to prevent the heat exchanger freezing.
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